threads table

Profiles

M,metric: angle 60°
UNC,UNF,UNEF,UNS: like metric, but dia/pitch imperial
BSW,W,Whitworth: angle 55°
BSF: British Standard Fine, like Whitworth but finer pitch
BSC: British Standard Cycle, CEI Thread; angle 60°, fine pitch, 1/4" and above all at 26 tpi, or 20 tpi ("CEI20")
BSP,G,R: British Standard Pipe, like Whitworth but for pipe diameters, dia for inner pipe dia!

Basics

Thread forms/profiles

Thread form defines the shape of the thread:
 thread angle
 typically 60° for metric and US series, 55° for Whitworth, 47.5° for BA
 for translation screws, 29° for ASME, 30° for trapezoid, 60° for truncated 60°
 crest/root forms (flat and how wide, or round and with what radius)
 flat for metric and US and for translation screws, for truncated Whitworth; for fasteners the root is usually slightly round or radiused to avoid stress concentration
 round for Whitworth-based, CEI, BSC
 flat crest, round root for UNJ and MJ forms, "flavors" of standards
 flat crest/root are more friendly to manufacture, cheaper, the edges can accommodate some rounding of the tools by wear
 taper, if present
 usually on pipe fittings
 pipe threads often exist in straight and tapered forms - BSPP vs BSPT/BSPTr (G vs R), NPS vs NPT
 direction
 most common is right-handed thread, RH, considered default when not specified explicitly; LH or left stands for left-handed thread, usually used where direction of rotation would tend to unscrew RH
 lead/pitch
 most threads are single-start, forming a single helix; here the pitch equals the lead
 multistart threads have lead (distance the screw travels on single turn) equal pitch times number of starts; common on faster leadscrews, enclosure lids/caps, and some self-tapping screws
 tolerances - these can introduce subtle differences between otherwise identical standards, eg. JIS metric thread hole strips more readily with ISO metric screw than ISO metric thread hole
 sometimes threads of different forms can be deceptively compatible; increased force (and even stripping) may be needed, or the fit may be too loose, or joint strength may be compromised
 Whitworth and Unified have limited compatibility, where the pitch/diameter fits they may screw together; may be good enough (eg. 1/4-20 for camera tripods) or may be insufficient strength (eg. for low-margin structural use)
 special profiles
 for motion screws (ACME, trapezoid, buttress)
 for enclosures/lids (glass forms, buttress)
 self-cutting/threading, many kinds

Thread series

 thread series are sets of diameter-pitch tuples, defined for a purpose
 thread series belong under a thread form; BSW, BSF and ME, and the pipe G and R, are all Whitworth form; UNC, UNF, UNEF, UNS, UN, and the pipe NPT and NPS, are all 60-deg 
 example is metric coarse/fine, or UNC/UNF/UNEF, or BSW/BSF, or ME
 series often have primary/first, secondary/second, sometimes tertiary/3rd, and sometimes "avoid if possible" choices
 forms can be used for nonstandard diameter/pitch combination
 the nonstandards can be completely ad-hoc
 or a selected subset can comprise a "series" of their own, eg. UNS; this allows more variability while providing at least some off-the-shelf availability of taps/dies
 fixed-pitch series are common
 before the age of CNC, threads were often made on a lathe using combinations of gears to achieve a ratio between rotation of workpiece and translation of tool
 manual tools like open dies from two halves allow cutting a thread of a given pitch into a range of diameters
 pitch and angle determine thread depth
 the finer pitch, the smaller depth but the tighter tolerances are needed on maintaining the diameter
 the smaller angle the deeper thread for the same pitch - Whitworth with 55° is deeper than unified/metric with 60°, 47.5° BA is deeper than equivalent Whitworth
 diameter specification is usually by the nominal thickness of the male screw; some series however use confusing notation where stated diameter does not equal real diameter
 common for pipe threads, where stated diameter is derived from the old historical inner diameter of the pipe
 sometimes numbers are used for "gauge sizes"; e.g. #4 UNC screw, or 5BA screw
 use the tables, Luke!
 taper is usually specified as ratio of diameter change per length; in inches per foot, or as a ratio; 1 inch per foot (12 inches) equals 1:12 taper
 used where self-sealing is needed, depth of threading has to be limited without a flange, or few turns need to be used for many threads to engage (steeper tapers used here)
 most common taper is 1:16, used on NPT and BSPT/BSPTr/R

Threading methods

 cutting
 most common way
 starts with crest diameter (for external) or root diameter (for internal), excess material is removed
 in practice starts with slightly smaller rod or slightly larger hole, difference depends on desired accuracy and material properties
 tap/die, a set of shaped cutting edges on a tool, provides own pitch; dies are short, may introduce changed or uneven pitch along longer thread
 single-point cut, a V-shaped knife on translation stage (lathe) or a V-to-side-shaped milling bit (CNC)
 compromises material strength, can introduce surface flaws facilitating fatigue cracks
 rolling
 less common
 starts with diameter somewhere in the middle between root and crest diameter, material is displaced; requires ductile materials
 uses rolling dies (more expensive than cutting dies), or rolling taps
 strengthens material by work hardening
 grinding
 for very hard materials and/or very high accuracy
 expensive
 self-threading
 often special thread forms, or specially modified screw tips
 the hole does not start with thread, the screw makes its own; common for wood, plastic and sheetmetal, sometimes for thick softer metals
 thread-cutting, with groove on the tip with sharp edge that acts as a tap
 thread forming, with profile that displaces the material
 usually coarse pitch and sharper deeper threads
 can also have pitch/profile matching standard screw profiles; thread created in the hole is then usable for standard screws

Diameter/pitch selection

 diameter may be forced by application and the stock material
 pipe/tube threads, matching external pipe diameters; pitch limited by available pipe/tube wall thickness
 wheel spoke threads, matching the wires on the spokes; often rolled, so thread diameter is larger than wire diameter
 predetermined components diameters; eg. shaft/locknut, gun barrel size, or optical lens/filter mounts
 standard series of diameters to choose from, with first/second/third choices; eg. 5mm is first choice, 5.5mm second, or 1/4" is first and 9/32" second
 pitch may be forced by application and the stock material
 for small diameters and thin-walled tubes finer pitch (and/or larger angle) is needed
 27-tpi common on thinner US tubing, 26-tpi for BSB for British brass tubing
 finer thread has more axial force for the same torque
 finer thread holds better in hard materials
 finer threads needed for thinner materials - sheetmetal; certain minimum number of threads is needed to hold sufficiently well
 finer thread leaves more of the material in the fastener - more strength for the same diameter
 finer thread is easier to make - less material to remove/displace
 coarser thread holds better in softer materials - "coarser than coarse" metric threads common in cast aluminium components, older screw series (BSW, Sellers) were coarser due to less good alloys common back then
 coarser threads allow faster assembly - fewer rotations for the same axial travel

Standard forms and series

 historical
 United States Standard thread - USS, Sellers Thread, Franklin Institute Thread - 60°, now incorporated to Unified Thread Standard
 sharp V thread - 60°, no roots/crests, steam-tight; discontinued in 1906 but used later in locomotive works
 CEI - Cycle Engineers Institute - 60°, rounded root/crest. Originally for bicycles. This thread series was superseded by British Standard Cycle (below). Anyone familiar with BSA motorcycles built until at least 1970 will recognise this thread. Although they have little else in common, CEI bolts have similar head sizes to BSW and BSF, and the same spanners will fit.
 British Standard Cycle - BSW, BSF, 60°, rounded root/crest. very fine pitch, on British bicycles and adapted to motorcycles; replaces CEI (Cycle Engineering Institute) thread spec, predates BSF; above 1/4" all have 26tpi, some 20tpi; Superseded CEI. A fine thread, extensively used in two-wheeler applications.
 British Standard Brass - BSB, 26-tpi fixed pitch, common on thin-walled brass tubes eg. in British gas appliances. Can be confused with BSC, through quite similar thread angles. Found on some very early cars, but in more recent times most often to be found on motorcycle and cycle cable adjustment mechanisms. [ref]
 various fine threads
 Lowenherz thread - late 19th century, 53.8°, common in precision instruments; series goes to large diameters
 Borgeaux, Latard; two similar slightly different systems, common in ancient watches
 Thury thread - Swiss, Filiere Suisse, FS, 47.5°, each size 10% different than previous; usually made by screw plates; based on Bourgeaux system and Latard system (Swiss screwmakers), who used P=C^n for pitch (C=0.94 for B., 0.93 for L.)
 based on samples from
 Swiss screwmakers: Borgeaux & Delamure (Geneva),  Perrelet & Martin (equals Latard)
 Swiss clock/watchmakers: Vacheron & Constantin (Geneva), Patek & Philippe (Geneva), Husson & Retor (Geneva)
 others: Isaac & Billon (Geneva, music boxes), Muller & Schweizer (Soleure), Japy (Beaucourt), watch chassis makers (Fontainemelon)
 British Association screw threads - derived from Thury with rounded measures, alternative to BSW/BSF for smaller than 1/4", common in electrical/instrumentation, still in niche uses
 German sewing machine threads, SM series
 almost like metric/SI/ISO threads, slightly deeper, slightly smaller root/crest flats
 NHS 56100, Swiss horological thread, established 1923; 50° for diameters below 1mm, 60° otherwise; basis for later ISO
 watch screw threads (Machinist Handbook 1909): sharp-V, 45-degree for use in nickel and brass, 60-degree for use in steel; Waltham Watch company mentioned - centimeters for diameter, tpi for pitch
 current
 British Standard Whitworth - 55°, mostly UK and old devices, niche uses; BSW (coarse), BSF (fine)
 rounded root and crest, better mechanical properties but much more difficult manufacture
 mostly found on non-US pipe threads - BSPP/G, BSPT/BSPTr/R
 British Standard Bastard, what forms on nut and bolt when BSF nut is force-threaded onto BSW bolt or vice versa; typically non-interchangeable
 also called "German threads"
 truncated Whitworth - 55°, US war standard, straight lines like UTS, form compatible with Whitworth
 TWC=BSW, TWF=BSF, TWPP=BSPP, TWS=Whitworth special (H28 1944)
 uses same tooling as National/Unified, allows low-cost compatibility of US-made parts with British equipment, important for wartime
 Unified Thread Standard - UNC, UNF, UNEF, UNS; 60°, imperial dimensions, otherwise identical to metric
 national - NC, NF, NEF, NS, N - root specified as flat with edges, radius supplied by tool wear; prone to stress-concentration
 unified - UNC, UNF, UNEF, UNS, UN - root specified as radius, minor changes in tolerances vs N-series
 UNJC, UNJF, UNJEF, UNJS, UNJ, UNRC, UNRF, UNREF, UNRS, UNR - larger and controlled root radius to mitigate stress-concentration
 derived from historical ASME and SAE series; original Sellers/USS mostly became NC/UNC, finer SAE automobile-aircraft series mostly became NF/UNF and NEF/UNEF
 some standard series changes in history; notably 1/2-12 vs 1/2-13 and especially 1-12 vs 1-14, the latter still causing troubles and misunderstandings
 ISO metric screw thread - M; 60°, worldwide standard now
 MJ - with larger and controlled root radius to mitigate stress-concentration
 SI - similar to ISO metric; adopted in Zurich in 1898 for 6mm to 80mm; based on French metric as adopted by Societe d'Encouragement de'l Industrie Nationale in 1884; sizes above 80mm added by Societe d'...
 SI - sizes 2.5mm to 5mm, small machine screw series, Serie de la Petite Mecanique, added by Societe d'... in 1906
 SI - small watchmaker screws (Serie Horlogere) standardized by Societe d'... in 1909
 SI - Serie francaise, Serie suisse, Serie Loewenherz, Serie de la Societe d'Encouragement: https://doc.rero.ch/record/19284/files/19230209.pdf
 STI - helical coil screw thread inserts, ANSI B94.9-1971; larger than corresponding standard thread to accommodate the insert thickness

Pipe threads

 two main forms - BSP, NPT; many less-common variants or types
 often requiring 100% thread depth, therefore requiring higher cutting forces on the tap/die
 straight, tapered male and straight female, or tapered both
 specified for inner diameter (pipe - these are confusing), or external diameter (tube)
 NPT, National Pipe Thread
 USA
 size specified as internal diameter of Schedule 40 pipe (smaller schedule = thinner wall; 1/2" Schedule 80 pipe has the same outer diameter as 1/2" Sch.40 pipe, but smaller inner diameter than 1/2")
 60-degree Sellers thread
 variable pitch at smaller diameters, converges to 11.5 tpi for 1" and larger, to 8 tpi for 2" and larger
 FPT for female thread, MPT for male thread
 NPS, for straight (non-tapered) version; also IPS (Iron Pipe Straight)
 many flavors, for non-fluid tight coupling (mechanical), tight with sealing compound, or dry-seal (NPTF, NPSF - F as Fuel)
 smaller than 1/8 used for compressed air, larger than 2" rare as other methods of joining than threads are more common there
 PTF variants
 PTF-SAE Short - one thread eliminated from small end of male or large end of female
 PTF-Special Short - one thread eliminated from large end of male or small end of female
 PTF-Special Extra Short - two threads eliminated from large end of male or small end of female
 BSP, British Standard Pipe - ISO 7 (pressure-tight threads), EN 10226, ISO 228 (non-pressure tight threads)
 UK, Europe, Japan; most common to encounter outside of USA
 size specified as internal diameter of "standard" pipe
 55-degree rounded Whitworth thread, most common way to encounter Whitworth
 variable pitch at smaller diameters, convertes to 11 tpi for 1" and larger
 parallel or tapered
 parallel: G or BSPP, both male and female parallel
 tapered: R for external/male taper (ISO 7); Rp for internal/female parallel (ISO 7/1); Rc for internal taper (ISO 7); Rs for external taper
 G for "Gas" (german), usually used on gas pipes; R for "Rohr" (pipe, German)
 metric and unified; sizes match external diameter
 standard kind of screw threads, often finer pitch to accommodate the thin walls of tubes
 usually not tapered
 less common kinds
 BSB, British Standard Brass - 26 tpi fixed pitch, Whitworth thread, for thin-walled brass tubes; sizes match external diameter; common on British gas appliances, on some old engines
 27-tpi fixed pitch series for US/unified threads, for thin-walled tubes; sizes match external diameter
 MTP, Model Taper Pipe, shrunk-down version of NPT; sizes match external diameter; METP, British equivalent
 MPT, Model Pipe Thread, non-tapered variant of NPT; sizes match external diameter
 UST, Universal Straight and Taper; P.M.Research vendor-specific thread, compatible with Unified, incompatible with MTP, 
 ME, Model Engineer; straight; sizes match external diameter; both solid fasteners and tubes
 SAE-LT, "taper thread" - same as UNF, with 1.8° taper (same as NPT); used in automotive industry primarily for grease fittings; self-sealing, 1/4-28 SAE-LT most common
 SAE-thread forming - 3.3° taper, 90° thread angle, male threads hardened so they can form female in untapped hole without deforming 
 metric thread forming - 7.5° taper, 105° thread angle, male threads hardened so they can form female in untapped hole without deforming; labeled "S", e.g. "S6x1.0"

tubes and pipes

 designated by outside diameter ("nominal diameter") or inside diameter ("nominal bore")
 nominal bore is specified for certain wall thickness ("schedule"); pipe with different wall thickness has the same outside diameter but inner diameter differs
 different countries tend to specify pipes/tubes differently
 common water/gas pipes tend to be BSP or NPT sizes, by nominal bore
 copper tubing is specified by outer diameter in Australia, by inner diameter in US/CA/NZ
 Europe uses metric tube sizes, US/Canada/Australia/New Zealand use inch sizes
 most common European sizes are 15mm and 22mm outside diameter
 sizes can also be specified by DN number, dimensionless number vaguely related to millimeters; eg. DN20 equals 3/4", or 19.05 mm; can be 3/4 outer diameter (Australia) or inner, with outer being 1.050" (USA, Canada, New Zealand)


todo: expand

todo

AERO     Aero-Thread for aircraft construction, patented form with spring-shaped inserts ,American, patented aviation thread for thread inserts, flank angle 60 ° (e.g. 0.5000-12 AERO)
API      also LP, Line Pipe; American Petroleum Institute Threads - American petroleum institute thread , cylindrical and tapered thread for the petroleum industry (usually with additional letters such as TBG, CSG, LP, REG ROTARY etc.), API Std 5 B - 1979 (e.g. 1 “API-LP)
ART      French, asymmetrical trapezoidal thread (artillery shape), flank angle 45 ° / 3 °, NF E 03-611 (e.g. ART 120x8)
ASN      Symmetrical trapezoidal thread for aerospace technology, ASN 204 (e.g. 10x2 LH)
B        Tripod thread, flank angle 60 °, DIN 4503
BC       Japanese and Korean thread for bicycles, flank angle 60 °, JIS B 0225, KS B 0226 (e.g. BC 5/16)
BeH      Bulgarian tire valve thread, flank angle 60 °, BDS 6378-67 (e.g. BeH 5.2)
Bi       Bi-thread, asymmetrical trapezoidal thread with flank play Flank angle 11 ° / 18 ° (e.g. Bi 6/28 nominal diameter 6 mm, pitch 0.907 = 28 Gg / 1 “)
Br       Briggs thread, tapered pipe thread, flank angle 60 °, taper 1:16, STAS 6422 (e.g. Br 1/4 “)
BSF trunc Whitworth fine thread with shortened flanks, BS 84-1956 (e.g. ½ in.-16 BSF trunc)
BUTT     American National Standard Buttress Inch Screw Thread , American saw thread, ANSI B1.9-1973, flank angle 7 ° / 45 ° (e.g. 2.5-8 BUTT-2A)
Buttress British saw thread, BS 1657: 1950 (e.g. 2.0 BS Buttress 8 tpi)
CM       French steel armored pipe thread, flank angle 80 °, NF C 63-021 (e.g. CM 10)
CN       Swedish bicycle thread, flank angle 60 °, SMS 365 (e.g. CN 9.5-26)
CZN      Multi-thread metric thread according to Carl Zeiss standard CZN 73. Basic profile according to DIN 13 part 19, flank angle 60 ° (e.g. M 36 x 7.5 P 0.75 10 threads)
DW       Dywidag thread for prestressed concrete formwork, flank angle 90 ° (e.g. DW 15 x 10)
E con    Tapered gas bottle thread according to DIN-EN 144-1, DIN-EN-ISO 11116-1, flank angle 55 ° (e.g. E 17 con)
EG       Insert threads for threaded wire inserts EG-M, EG-MF, EG-UNC, EG-UNF etc.
FG       HNA fine thread DIN 80101, table AN 100, flank angle 55 ° (e.g. 1 “FG, 29FG)
GA       Australian pipe thread, flank angle 55 °, AS 1722 (e.g. GA 1/2 / 15)
Gaz      French pipe thread, cylindrical, NFE 03-005 (e.g. 1 / 8-28 Gaz) (Gaz is largely identical to pipe thread G DIN ISO 228)
Gf       Freeze pipe thread in mining, for freeze pipes and lye drain pipes in freezer shaft construction DIN 4930-2 (e.g. Gf 127)
Gg       Drill pipe thread, conical, for deep drilling technology in well and mining, DIN 4941 taper 1:16 (e.g. Gg 51), DIN 20314 taper 1: 4 (e.g. Gg 4.1 / 2)
Gk       Italian tapered pipe thread, flank angle 55 °, taper 1:16, UNI 6124.74 (e.g. Gk 1/2)
GM       Dutch thread for gas meter, flank angle 55 °, NEN 2373 (e.g. GM 3/4)
H        Wood screw thread, flank angle 60 °, DIN 7998, see REBELL catalog page 18.7
HK       HK-Piston thread, special thread, flank angle 80 ° (e.g. HK 4.2)
HNA      Fine thread, flank angle 55 °, DIN 80101, table AN 100 (e.g. 32FG-HNA)
IG       Special thread for containers, wooden barrels, rainwater tanks S60x6, plus connection adapter with thread reduction for connecting pumps, hoses, couplings and ball valves (e.g. IG x ¾ “AG)
ISA      Historic German thread from 1919, further development of the SI thread and forerunner of the DIN profile
JG       Special thread JG, flank angle 55 ° (e.g. JG 26 x 16 Gg / 1 “)
LN       Aerospace thread, LN 9163, DIN EN 2158 (e.g. LN 9163 M6-4H5H)
MFS      Standard and fine threads for tight fit in cast aluminum alloys DIN 8141: July 1993 (e.g. MFS 12 x 1.5)
Mk       Dutch metric tapered external thread, flank angle 60 °, taper 1:16, NEN 1988 (e.g. Mk 20x1.5)
M keg    Metric tapered thread, taper 1:16, flank angle 60 °, DIN 158, see REBELL catalog page 17.5
Mp       Dutch metric tapered internal thread, flank angle 60 °, taper 1:16, NEN 1988 (e.g. Mp 6)
NHS      Swiss watch thread, flank angle: 50 ° (profile 1), 60 ° (profile 2), ASA (e.g. 1.5 x 0.3 NHS)
if       Romanian microscope lens thread, flank angle 55 °, STAS 6852-81 (whether 4/5 “x 1/36“)
PE       Swiss Whitworth thread, flank angle 55 °, SNV 24460 (e.g. 3/16 “PE)
PF       Korean cylindrical pipe thread, KS B 0221, flank angle 55 ° (e.g. PF 6 / 1/8)
PJ       Parallel pipe thread PJ ½ ”JIS B 0202 , Japanese cylindrical pipe thread, flank angle 55 °
PL       Asymmetrical trapezoidal screw threads of plastic material , Swedish asymmetrical trapezoidal thread for plastic containers, flank angle 30 ° / 4 °, (e.g. PL 10 x 3)
Pr       Swedish steel armored pipe thread, SEN 241017, flank angle 80 ° (e.g. Pr 12.5)
PT       Korean tapered pipe thread, KS B 0222, flank angle 55 °, taper 1:16 (e.g. PT 6 / 1/8)
RC       Australian tapered pipe internal thread, AS 1722, flank angle 55 °, taper 1:16 (e.g. RC 1.1 / 2/40)
RdG      Danish round thread, DS 199, flank angle 30 ° (e.g. RdG 60)
S        Metric saw thread for general use, DIN 513, flank angle 30 ° / 3 °, see REBELL catalog page 18.8
S        Metric saw thread in mining, DIN 20401, flank angle 30 ° / 3 °, see REBELL catalog page 18.9
SAT      Swiss SA thread, SNV 24462, flank angle 60 °, (e.g. SA 8)
SAE-SP   SAE Standard Threads for Spark Plugs , American spark plug thread, metric ISO thread, flank angle 60 ° (e.g. M14x1.25 SAE)
SB       Manufacturers Stovebolt Standard Thread , historic American standard thread in vehicle engine construction (Chevrolet and GMC trucks before 1973)
S DeN    Metric special saw thread according to cover standard DeN 1.596.01. Flank angle 45 ° / 5 ° (S20x2 DeN) for collets, sleeves, gudgeon mandrels, quills etc. on cover, tool and milling machines, see REBELL catalog page 18.8
Sg       Collet thread (e.g. W 5 x 36, W 6.85 x 40); Thread for tension collets according to DIN 6341-2 1993
SgF      Italian metric saw fine thread, UNIM 128, flank angle 30 ° / 3 ° (e.g. 80 SgF)
SGT      Special Gas Taper Threads , American special gas pipe thread, tapered, ANSI CGA V-1, flank angle 60 °, taper 1: 8 (e.g. 1 / 8-27 SGT)
Sim      Modified French SI thread for the aircraft industry, NF L 05.200
SM       Japanese and Korean threads for sewing machines, JIS B 0226, KS B 0225, flank angle 60 ° (e.g. SM 1/16 threads 80)
Sp       Old Swiss special thread Whitworth thread form according to ESCHER WYSS standard 2040, left and right hand threads from 25 to 200 mm in diameter, for crank pins, regulating rods and the like, in machine and turbine construction, flank angle 55 ° (e.g. Sp 70 x 8 Gg / 1 "N 2040)
Spec Rd  Special round thread, internal thread, flank angle 60 ° transitioning to 30 °, combined thread profile made of metric ISO thread DIN 13 and metric ISO trapezoidal thread DIN 103. The special round nut thread can be paired with metric ISO bolt thread according to DIN 13, ( e.g. Spez-Rd 12 x 1.75)
SQ       Square Thread , Indian flat thread , IS: 4694 (e.g. SQ 30x6)
Tr       Rounded trapezoidal thread for rail vehicles DIN 30295 1973-05, flank angle 30 ° (eg Tr 40 x 5 DIN 30295); this thread is mainly used for spring tension screws on locomotives
Sp       Old Swiss special thread Whitworth thread form according to ESCHER WYSS standard 2040, left and right hand threads from 25 to 200 mm in diameter, for crank pins, regulating rods and the like, in machine and turbine construction, flank angle 55 ° (e.g. Sp 70 x 8 Gg / 1 "N 2040)
STUB-ACME  American trapezoidal thread, flattened, with reduced thread depth, flank angle 29 °, ANSI B 1.8-1977 (e.g. ½ -20 Stub-Acme)
STI      Helical Coil Wire Screw Thread Inserts , American insert thread for HC thread inserts, ANSI B94.9-1971
T        Italian round thread, UNAV 8023, flank angle 30 ° (e.g. 12 x 1/10 T)
TE       Tubes électriques , French pipe thread, NFC 68-311, flank angle 80 ° (e.g. TE 7-20)
URS      Trapezoidal thread for thread fit with backlash (e.g. 13x2 URS 09001)
Ven      Old GDR valve thread, TGL 39158, flank angle 60 ° (e.g. Ven 5)
Vg       Valve thread for vehicle tires DIN 7756, flank angle 60 ° (e.g. Vg 8), see REBELL catalog page 17.4
Vz       Czech tire valve thread, CSN 014084, flank angle 60 ° (e.g. Vz 12)
WHIT     Whitworth Thread Series , British Whitworth standard special thread , flank angle 55 °, with special pitches, BS 84 (e.g. WHIT 1 / 4-32)
WHIT.S.  Whitworth Selected Thread Series , British Whitworth thread, selection series, BS 84, AS B47 (e.g. 1.25 in.-12 WHIT.S.)
W-4 Gg   Whitworth thread with constant pitch 4 threads per inch, DIN 239, thread profile Whitworth shape, flank angle 55 °, outside diameter in mm, pitch in threads per inch (e.g. W 60 x 1/4)
W-10 Gg  Whitworth fine thread for locomotive construction, DIN LON 286, 1937, flank angle 55 ° (e.g. W 22 x 10 Gg), has not been used since about 1975
W-20 TPI Shank Cutters Whitworth-Form 20-TPI, standard SKF specification , end mill tightening thread, BS 122, flank angle 55 ° (e.g. W 16 x 20 TPI)
W12x12   Hoof stud thread for horse studs, horseshoe, W 12 x 12 Gg / 1 “, single-start, flank angle 55 °
Yv       Turkish round thread, TS 61/37, flank angle 30 ° (e.g. Yv 30)

https://donnishjournals.org/djemt/pdf/2019/may/Mircea-Bogdan.pdf
UNK      controlled-radius, similar to UNR, old
TWC/TWF/TWS  truncated Whitworth (American), Coarse/Fine/Special, war standard ASA B1.6
TWPP     truncated Whitworth pipe parallel
BS Buttress    British buttress, 7/45°
NTC      NPT, tapered, for electrical conduits, tolerances exceeded
ANPT     NPT, aeronautical flavor
SAE-LT   for lubrication fittings, tapered, SAE J 534
UNO      UNO-form screw thread for electric sockets and lamp bases

BSF vs UNC

BSF/UNC combinations where thread pitch matches (55/60° thread compatibility):
  BSF nut, BSF bolt:    no play, match
  BSF nut, UNC bolt:    overly tight fit, needs force, can seize
  UNC nut, BSF bolt:    some small play, can wiggle out over time
  UNC nut, UNC bolt:    no play, match

history

[ref]
1800   Henry Maudslay develops the first industrially practical screw-cutting lathe, setting the stage for standardisation of screw thread sizes.
1841   UK:BSW; Joseph Whitworth devises the British Standard Whitworth system, the first nationally standardised system. BSW (BS 84:1956)
1864   US:USS; William Sellers presents the inch-based United States Standard thread (USS thread), one of his 90-plus patents, which simplifies thread cutting.
1868   US; Sellers thread adopted by US Navy
1898   world: The International Congress for the standardization of screw threads at Zurich takes a bold step in unifying the disarray of metric thread standards; SI system established
       Metric threads were mostly unified in 1898 by the International Congress for the Standardization of Screw Threads
1901   UK; British Engineering Standards Association formed
1903   US; A.L.A.M. (Association of Licensed Automobile Manufacturers) 
1906   US; A.L.A.M. (car mfg) standard adopted for fine threads, precursor to SAE standard
1907   US:USS; Seller's thread adopted as a national standard after being a de-facto standard
1907   US:ASME; Standard Proportions for Machine Screws issued; sizes below 1/4" later adopted to Unified
1908   UK:BSF; British Whitworth Fine, BSF, introduced
1911   ALAM makes SAE custodian of the fine thread standard; standard extended to 1.5", later extended above 2"; below 1/4" uses ASME standards
1912..1916  US:SAE; SAE creates "SAE series"
...somewhere before WW1  UK:BSF; fine BSF series introduced, with one-size smaller heads/nuts

1915   US; two reports on special threads for electric fixtures and fittings; SAE approves extra-fine series ("SAE fine series for aeronautic and other applications...")
1918   US; comprehensive report on standardization of limits and tolerances of screw-threaded fits
1919   DE:DIN; Germany develops DIN standard, metric
1921   US; progress report of National Screw Thread Commission; ASME coarse series (under 1/4") and USS taken into NC, ASME fine and SAE series into NF; American Briggs into NPT, NFPA couplings
1924   US; ASA B1-1924 issued; Screw Threads for Bolts, Machine Screws, Nuts and Commercially Tapped Holes
1928   US; progress report of National Screw Thread Commission
1929   UK:BSW/BSF; smaller-size heads/nuts made standard
1933   US; USS renamed National Coarse, SAE renamed National Fine
1935   US; ASA B1.1-1935 issued
1939   US; handbook on screw thread standards issued - H25, "Screw-Thread Standards"
1940   world; ISA bulletin 26 released
1942   US; handbook on screw thread standards revised - H28, "Screw-Thread Standards"
1944   US; handbook on screw thread standards revised
1947   US:AS; ASME standard was superseded by the American Standard
1947   world:ISO; The International System of Units (ISO) is founded, opening for the metric system’s expansion.
1949   US; ASA B1.1-1949 issued, Unified Thread System (UTS) adopted, ANS standard made obsolete
1949   US:UTS; The United Thread System (UTS) is adopted aiming to unify the inch-based thread standards.
1951   UK:BA; BA screws specified, BS 93:1951
1960   world:ISO; metric 
1960   US; B1.1-1960 issued
1970s  US; Big Three (Ford, Chrysler, GM) drive metric system adoption; Caterpillar, John Deere, etc. follow
1974   US; B1.1-1974 issued
1982   US; B1.1-1982 issued
1989   US; B1.1-1989 issued
2001   DE; Germany withdraws DIN fastener standards, replaces with ISO
2003   US; B1.1-2003 issued

According to an SAE handbook:
SAE NF series was approved on June 1911.
SAE fine (NEF) series was approved January 1915.
SAE Special pitch series approved June 1926.
NC series approved January 1935.
8-, 12-, 16 pitch (National series) approved January 1935.
The US Federal Government has been actively attempting standardization since 1933 or earlier.
The H28 manuals published by the National Bureau of Standards mentions the handbook being compiled as a result of a 1933 report from the National Screw Thread Commission.
By 1939, and possibly earlier, the predecessor of the H28 handbook, H25, was already in print.

up until 1920s other thread forms (V-thread, etc.) still in use in the US, in industry-specific applications

B1-1924, B1.1-1935, B1.1-1949, B1.1-1960, B1.1-1974, B1.1-1982, B1.1-1989, B1.1-2003
HSTS = Handbook of Screw Thread Standard for Federal Services; HSTS 1939 copies B1.1-1935 with some omissions and minor differences in some size limits
NSTC = National Screw Thread Commission report
  1928: recommended pitches: 4,6,8,10,12,14,16,18,20,24,28,32,36,40,48,56,64
  1933 vs 1928:
    - 5 sizes added to coarse, 1 to fine
    - all above 1.1/2" eliminated from fine
    - 4 sizes added to hose coupling
    - added 8-pitch series, 16-pitch, revised 12-pitch
ISA 1940: ISA bulletin 26, recommended screw sizes
  ISA A 4-9-4 threads (vs 5-0-5 spacing, above 80mm) is to allow protection of the threads on 5mm-spaced shafts with 0.5mm sheetmetal during installation
  ISA screw crest clearances: 0.045*pitch in Denmark, Germany, Japan, USSR; 0.05*pitch in Austria, Czechoslovakia, Finland, Italy, Netherlands, Norway, Poland, Switzerland
BS 1095-1943 - British war standard, use metric only if interchangeability needed; matches ISA A from 6..80 then in 5-0-5, down to 5..1mm, also includes "French Metric"
H28 1942: Screw-thread Standards for Federal Services 1942, H28 handbook
H28 1944: Screw-thread Standards for Federal Services 1944, H28 handbook
H28 1950: 1950 Supplement to Screw-thread Standards for Federal Services 1944
H28 1957: Screw-thread Standards for Federal Services 1957, H28 handbook
H28 1963: 1963 Supplement to Screw-thread Standards for Federal Services 1957

Lowenherz 20-40mm taken from US Bureau of Standards LC18 1923; identical to VDI spec

metric 50°

10.1049/tpe.1967.0059
France E27-011, USSR GOST 3196-8
Japan JIS M B0-0201, Poland PN.M.02112
Bulgaria B.D.S. 1241

Pitch series

8-UN     originally intended for high-pressure-joint bolts and nuts, it is now widely used as a substitute for the Coarse-Thread Series for diameters larger than 1 inch
12-UN    originally intended for boiler practice and thin nuts on shafts, it is now used as a continuation of the Fine-Thread Series for diameters larger than 1.1/2 inches
         1/8" step, allows retapping worn holes with next-larger tap
16-UN    suitable for adjusting collars and retaining nuts, and also serves as a continuation of the Extra-fine Thread Series for diameters larger than 1.1/16 inches

usual pitch use

100 tpi  watches, instruments, adjustment
80 tpi   watches, instruments, adjustment
72 tpi   watches
64 tpi   sewing machines
62 tpi   bicycle wheel spokes, 17g..14g, CEI
60 tpi   watches, small instruments Whitworth
56 tpi
48 tpi
44 tpi   bicycle wheel spokes, CEI
40 tpi   lens mounts
36 tpi   optical filters
32 tpi   thin tubes
30 tpi   pre-war
28 tpi   on thinner pipes, G1/16
27 tpi   common on thin-walled tube stock, .246" to 1.006"; also NPT 1/16, 1/8
26 tpi   common on old brass stock, British Standard Brass
         common on bicycles; 24 and 20 tpi for larger diameters
24 tpi   tube couplings from 5/16; bicycles, larger diameters
20 tpi   "Manchester thread" - used by Manchester, UK plumbers, historical
         tube couplings, from 7/16; circular connectors
18 tpi   tube couplings from 1/2"; circular connectors
16 tpi   on thin steel tubes/conduits; circular connectors
14 tpi   common on gas piping, gas bottles, valves; G1/2..G7/8, NPT 1/2, 3/4; condenser tube glands, Whitworth
12 tpi   common on larger tube coupling, SAE 1.1/16 and more
11.5 tpi common on gas piping, NPT 1..2
11 tpi   common on larger pipes, G1" and more; copper studs on oil switchgear, Whitworth (1/2" is -12)
10 tpi   common old standard pitch
8 tpi    common on large pipes, NPT 2.5 and more
7.5 tpi  firehoses
6 tpi    firehoses
4 tpi    firehoses

same pitch on different diameters of tube fittings - the same number/angle of turns of wrench past finger-tight for the same crimp

"A ‘Jewelers Thread’ used even today for precious metals such as silver, gold, and platinum has a thread angle of 80 degrees."
https://www.rustmag.com/gear/2018/1/4/threads-and-thread-systems

preferred pitches

40,36,32,28,24,20,16,12,10,8,6,4

preferred diameters

range       1st choice  2nd choice
1/4    5/8        1/16
5/8    1.1/2      1/8   1/16
1.1/2  6          1/4   0.1
6      16         1/2   1/4
16     24         1     1/4

Diameters are often dictated by the stock they have to be cut or rolled into:
 pipe threads, for outer diameters of pipes, has to match pipe diameter specs
 tube threads, for tube stock, small pitch forced by thin walls
 screws, from the USG gauge stock rods/sheets, explains odd x/64" fractions
 wires, often on wheel spokes, from various national wire gauges; thread often rolled, major dia larger than wire dia

conference for unification report, vol.73, small screws:

motion screws:
preferred pitches: 40,50,100 tpi; 0.5,1mm
second choice pitches: 10,20 tpi; 2mm
preferred diameters: 1/8, 3/16, 1/4, 3/8
second choice diameters: 3/32, 5/32, 5/16, 1/2
third choice diameters: 7/32, 9/32, 11/32, 7/16
optical tubes:
preferred pitches: 12,24,36,48,60,72 tpi
second choice: 16,20,32,40,64,80 tpi

numbered gauge-size machine screws

American Screw Co. standard: step difference 0.01316"
ASME standard: step difference 0.01300"

extra-coarse pitches on small diameter can be found on historical equipment, and/or when threads have to be cut in soft material (eg. cast aluminium engines)

chart

https://www.icscuttingtools.com/pdfs/screwthread-guide.pdf

SI coarse, fine, said from 1971 handbook ("SI [fine ]1971")
https://forum.alpinerenault.com/viewtopic.php?f=9&t=20760&start=220 ;
https://i73.servimg.com/u/f73/15/69/46/05/img57910.jpg
http://i73.servimg.com/u/f73/15/69/46/05/img57811.jpg
Warning: marking SI thread as "M" is a misnomer.

countersink angles

60°   deburring; on some larger metric (over M20; M22 and over); some rivets
70°   some rivets; old countersunk-head screws (Machinists Handbook 1909)
75°   rivet heads (less common? not in wikipedia article)
78°   aircraft rivets AN425
80°   (not in wikipedia) screw countersinks, DIN standard
82°   common for screws, US standard, common on Unified Thread screws; ASME standard (Machinists Handbook 1909)
90°   common for screws, metric/ISO standard, common on metric screws; US wood screws (82deg for metal)?
100°  on aircraft/AN/milspec rivets and structural screws, AN426/427; with thin-skinned missiles and aircraft; often "reduced head" (smaller head dia)
110°  uncommon
120°  sheetmetal rivets, flat-head sunk sheetmetal screws, some small-head screws
156°  rivets for honeycomb composites
180°  flat; counterboring, not a countersink (or extreme case)

bolts vs screws

screw is designed to rotate during installation
bolt is more likely to stay stationary, used with nut; square underside or nonfinished head underside possible; thread often not all the way to head

Series designation:

1st, 2nd, 3rd: first, second, third choice (primary, secondary, tertiary)
constant: constant pitch series (0.75, 1, 1.25, 1.5, 2, 3, 4, 6, 8 mm; 6, 8, 10, 12, 14, 16, 18, 20, 27, 28, 32 tpi)
fine (coarse): fine by ISO, coarse mentioned in old tables
(coarse): somewhere specified as coarse, elsewhere unspecified

Notation

 (type)[dd](x[p])    thread diameter and pitch, where pitch is usually part of standard and can be omitted
 M6(x1)           metric 6mm, 1mm pitch if pitch not explicitly specified

 ([type])[dd]x[p]    thread diameter x pitch
 M3.5x0.5         metric 3.5mm diameter, 0.5mm pitch
 20x1             unspecified type, 20mm diameter, 1mm pitch

 ([type])[dd]x[p]x[s]   thread diameter x pitch x number of starts (atypical)
 Tr20x8x3         trapezoid 20mm diameter, 8mm pitch, 3 starts

 ([type])[dd]-[tpi]  thread diameter - threads per inch
 M27-32           metric 27mm diameter, 32 tpi (== M27x0.79375)
 1.1/4-8          imperial, most likely UN, 1.25 inch diameter, 8 tpi pitch (== 31.75x3.175)

For ISO metric, pitch can be omitted. The coarse screw series is then assumed.
This may cause ambiguities when weird pitches of French or Japanese origin are encountered; e.g. when M3 means M3x0.6 instead of M3x0.5 - a definite head scratcher.
ANSI specification requires pitch even for coarse series.


Beware:

Thinner than about 1/4 inch screws are often specified as #something, from #0 to #12. The # can be omitted,
though there is a risk of misinterpreting it as millimeters (but the pitch is usually -tpi, with dash) or as inches (where the pitch is too insanely thin for such a diameter).

Direct pitch ([dia]x[pitch]) and tpi ([dia]-[pitch]) can be mislabeled, the "x" and "-" may be swapped. If the number makes more sense
when interpreted as the other one, it's likely to be.

Sometimes the screws omit pitch and instead specify length. Then
M3x20 means ordinary M3x0.5, 20mm long.

Other values can be also used instead of pitch. A "M6x0.6" nozzle can be a standard M6x1, with 0.6mm hole.

Yes, it is convoluted.

S vs M: metric screws differ in specification for "small" screws; S-series is almost like M-series
https://www.pemnet.com/files/design_info/techsheets/Miniature_Screw_Threads.pdf
as of ISO 1501
both: 60°, major diameter truncation 0.125*pitch
M series: minor diameter truncation 0.250*pitch
S series: minor diameter truncation 0.321*pitch
another profile is UNM, as of ASME B1.10M; identical to ISO 1501 but only one tolerance class, too tight for practical uses (and plated parts)
alternatively, S for pitch under and at 0.3mm, M for 3mm and above;

gauges

common US gages, as of 1925 NSTC report:
AWG == American Wire == Brown & Sharpe: copper, brass, bronze, other non-ferrous wires
steel wire == Wasburn & Moen: steel wire (except drill rod, music wire)
music wire: piano wire, other music wire
Birmingham == Stub's Iron Wire: telegraph and telephone wire, some thickness of nonferrous sheetmetal, some tube walls
twist drill and steel wire
sheet zinc: zinc sheetmetal

used in UK
SWG == Standard Wire Gauge

Pipes

Pipe threads are sorted under the outer diameter of the matching pipe. The actual major diameter is a notch smaller due to thread crests.

todo notes

GPI and SPI bottle neck finishes

GPI - Glass Packaging Institute, North America
SPI - Society of the Plastics Industry, North America

GPI and GCMI = US, SP = equivalent Europe standard[ref]

diameter/style, two numbers
styles: [ref]
specs: [ref], [ref: ASTM D2911]
300
310
320
330
R3  - see 400
400 - one-turn thread, 18-120mm dia, shallowest, very common [ref]
410 - 1.5 turn thread, intermediate height, good for more space between bottle shoulders and thread tops, 18-28mm dia [ref]
415 - 2 turn thread, tallest common, thinner threads, 13-33mm dia, perfect for pumps and sprayers [ref]
    - 410 and 415 usually interchangeable if not tamper-evident
425 - 2 turn thread, narrow threads, typ. on small vials
430 - 1 or 2 turn, thick deeper threads, buttress neck (for pouring with better accuracy), top bead
435
450
460
470 - 1 turn, thread deeper than 400, typ. on glass mayo jars
475
480
485 - 1 turn, can take 400 cap, typ. on spice jars
490
660 - nonthreaded
700 - nonthreaded
710 - nonthreaded
800 - nonthreaded
1705
1710
1710
2000 - lug finish, 3-start; 38mm; 38-2000
2010 - lug finish, 4-start; 43mm; 43-2010
2020 - lug finish, 4-start; 53mm, 58mm; 53-2020, 58-2020
2030 - lug finish, 4-start, noncontinuous threads, typ. mayo or mason jars for food; 63mm, 66mm, 70mm; 63-2030, 66-2030, 70-2030; 53-2030?, 82-2030?
2035 - lug finish, 4-start, tall neck, 70mm, 70-2035
2040 - lug finish, 6-start; 77mm, 82mm; 77-2040, 82-2040; 89-2040
2050 - lug finish, 6-start; 89mm, 89-2050
2055 - lug finish, 6-start; 100mm; 100-2055
2070 - lug finish, 8-start; 110mm; 110-2070
2080 - lug finish; 30mm; 30-2080
DBJ - ring below threads, to catch a tamper-evident tear-off ring

18mm DIN - common dropper bottles
28mm - very common bottles


common styles: [ref]
18-400 - small dropper bottles, essential oils
20-410 - smaller 1..4oz bottles, mostly plastic
24-410 - common plastic, some aluminium, 2..16oz
28-400 - common
28-410 - common plastic, some aluminium, 8..32oz (medium)
33-400 - jars
38-400 - glass, plastic, metal; very flexible; 4oz..1gal
38-430 - food and flavoring industry, buttress bottles with pour lip
43-400 - food
45-400 - plastic, glass; pharma nutra industry, packer bottles 175..400cc
48-400 - food
53-400 - plastic packer bottles; pharma nutra industry, food, 400..950cc
58-400 - food
58-2030 - jars (not in specs?)
63-400 - jars, food
70-400 - jars, food
70-450 - jars, food; deep, very common?
83-400 - jars, food
86-460 - jars, food, hi-heat
89-400 - jars, food
110-400 - jars, food
120-400 - jars, food

TABLE OF DIMENSIONS, STANDARDS AND EXAMPLES

Legend

!!!   = important, owned
!     = important
H     = historical standard
@     = standard
===== = thickness gauge
====  = minor standard
===   = standard
==    = standard, important, owned
c     = constant pitch standard
s     = self-tapping
W     = wood screw
L     = leadscrews/actuators
M     = medical/surgical
 %    = piping/tubing standard
 p    = packaging, bottles
 g    = gas connections
 o    = optics, objectives, lens mounts, filters
 W    = weapons; guns, rifles, fuzes
 C    = connectors, business ends, except their panel nuts
 S    = stage technology, photography, tripods, lamps incl. desk lamps
 t    = tools, collets, machining
 h    = historical application
T     = tap, die, toolset
H     = historical standard
i     = information
"M" prefix is used here to denote metric screws with SI/ISO 60-deg profile or similar. In "reality", the M is not used in e.g. SI specification. Let's not sweat the details.
"W" prefix is used to denote Whitworth thread form with 55-deg rounded profile.

List

    thread            description

=====50 SWG           British Standard Wire Gauge, 0.0010", 0.0254mm
=====49 SWG           British Standard Wire Gauge, 0.0012", 0.0305mm
=====48 SWG           British Standard Wire Gauge, 0.0016", 0.0406mm
=====47 SWG           British Standard Wire Gauge, 0.0020", 0.0508mm
=====46 SWG           British Standard Wire Gauge, 0.0024", 0.0610mm
=====45 SWG           British Standard Wire Gauge, 0.0028", 0.0711mm
=====40 AWG           American Wire Gauge, Brown&Sharpe, 0.00314", 0.0799mm; copper conductors, 0.00501mm2, 3441mΩ/m
=====44 SWG           British Standard Wire Gauge, 0.0032", 0.0813mm
=====39 AWG           American Wire Gauge, Brown&Sharpe, 0.00353", 0.0897mm; copper conductors, 0.00632mm2, 2729mΩ/m
=====43 SWG           British Standard Wire Gauge, 0.0036", 0.0914mm
=====38 AWG           American Wire Gauge, Brown&Sharpe, 0.00397", 0.101mm; copper conductors, 0.00797mm2, 2164mΩ/m
=====42 SWG           British Standard Wire Gauge, 0.0040", 0.1016mm
=====41 SWG           British Standard Wire Gauge, 0.0044", 0.1118mm
=====37 AWG           American Wire Gauge, Brown&Sharpe, 0.00445", 0.113mm; copper conductors, 0.0100mm2, 1716mΩ/m
=====40 SWG           British Standard Wire Gauge, 0.0048", 0.1219mm
=====36 AWG           American Wire Gauge, Brown&Sharpe, 0.00500", 0.127mm; copper conductors, 0.0127mm2, 1361mΩ/m
=====39 SWG           British Standard Wire Gauge, 0.0052", 0.1321mm
=====35 AWG           American Wire Gauge, Brown&Sharpe, 0.00561", 0.143mm; copper conductors, 0.0160mm2, 1079mΩ/m
=====38 SWG           British Standard Wire Gauge, 0.0060", 0.1524mm
=====34 AWG           American Wire Gauge, Brown&Sharpe, 0.00630", 0.160mm; copper conductors, 0.0201mm2, 856.0mΩ/m, 0.18..0.3 amps (60/75°C)
=====37 SWG           British Standard Wire Gauge, 0.0068", 0.1727mm
=====33 AWG           American Wire Gauge, Brown&Sharpe, 0.00708", 0.180mm; copper conductors, 0.0254mm2, 678.8mΩ/m
=====34 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.00725", 0.1842mm; injection needle, inner dia 0.0826mm, orange
=====36 SWG           British Standard Wire Gauge, 0.0076", 0.1930mm
=====32 AWG           American Wire Gauge, Brown&Sharpe, 0.00795", 0.202mm; copper conductors, 0.0320mm2, 538.3mΩ/m, 0.32..0.53 amps (60/75°C)
=====33 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.00825", 0.2096mm; injection needle, inner dia 0.108mm, black
H   0.213x0.086       Bourgeaux thread no.24, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====35 SWG           British Standard Wire Gauge, 0.0084", 0.2134mm
=====31 AWG           American Wire Gauge, Brown&Sharpe, 0.00893", 0.227mm; copper conductors, 0.0404mm2, 426.9mΩ/m
=====34 SWG           British Standard Wire Gauge, 0.0092", 0.2337mm
=====32 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.00925", 0.2350mm; injection needle, inner dia 0.108mm, deep green
@   25BA              BA 25, 0.25x0.072, 47.5°, British Association standard BS 93; small size rarely used
=== M0.25x0.075       S0.25x0.075, .25 UNM, ISO primary, ISO screws/bolts/nuts, GOST 9000-73, GOST 24705-81
=====30 AWG           American Wire Gauge, Brown&Sharpe, 0.0100", 0.254mm; copper conductors, 0.0509mm2, 338.6mΩ/m, 0.52..0.86 amps (60/75°C)
=====33 SWG           British Standard Wire Gauge, 0.0100", 0.2540mm
H   0.254x0.072       FS 25, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 25, 0.01-353.8
@   0.01-400          Whitworth Instrument, 47.5°, size 10, 0.254x0.064
=====31 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.01025", 0.2604mm; injection needle, inner dia 0.133mm, white
H   0.267x0.088       Bourgeaux thread no.23, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====32 SWG           British Standard Wire Gauge, 0.0108", 0.2743mm
@   0.011-400         Whitworth Instrument, 47.5°, size 11, 0.279x0.064

=====29 AWG           American Wire Gauge, Brown&Sharpe, 0.0113", 0.286mm; copper conductors, 0.0642mm2, 268.5mΩ/m
H   0.289x0.080       FS 24, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 24, 0.0114-318.3
@   24BA              BA 24, 0.29x0.080, 47.5°, British Association standard BS 93; small size rarely used
H   0.291x0.091       Bourgeaux thread no.22, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====31 SWG           British Standard Wire Gauge, 0.0116", 0.2946mm
H   30 NHS            0.30x0.075, 50°, NHS 56100; Serie suisse
====M0.3x0.075        DIN, German horological metric, "French Metric", French horological 50°, NHS 56100 (50°) (from 1923)
    0.30x0.075        no.1 Bergeon tap, watchmaking/horological, drill 0.24mm
T   0.30x0.075        in Bergeon No.30010 tap/die set, watchmaking
=== M0.3x0.08         S0.3x0.08, S0.30, .30 UNM, ISO primary, ISO screws/bolts/nuts, ASA B1.10, ASME B1.10M, GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.30x0.08         watchmaking, Horotec taps, Bergeon 2659 dies; common?
====M0.3x0.09         ISO extended
@   0.012-350         Whitworth Instrument, 47.5°, size 12, 0.305x0.073
=====30 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.01225", 0.3112mm; injection needle, inner dia 0.159mm, yellow
H   0.312x0.093       Bourgeaux thread no.21, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====30 SWG           British Standard Wire Gauge, 0.0124", 0.3150mm
=====28 AWG           American Wire Gauge, Brown&Sharpe, 0.0126", 0.321mm; copper conductors, 0.0810mm2, 212.9mΩ/m, 0.83..1.4 amps (60/75°C)
H   0.328x0.089       FS 23, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 23, 0.0129-286.7
@   0.013-350         Whitworth Instrument, 47.5°, size 13, 0.33x0.073
@   23BA              BA 23, 0.33x0.090, 47.5°, British Association standard BS 93; small size rarely used
H   0.0132-360        Elgin watch screw thread, historical, 0.3353x0.0706 (Guide to World Screw Threads)
=====29 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.01325", 0.3366mm; injection needle, inner dia 0.184mm, red
H   0.344x0.094       Bourgeaux thread no.20, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====29 SWG           British Standard Wire Gauge, 0.0136", 0.3454mm
H   35 NHS            0.35x0.075, 50°, NHS 56100; Serie suisse
====M0.35x0.075       "French Metric", French horological 50°, NHS 56100 (50°) (from 1923)
    0.35x0.075        no.2 Bergeon tap, watchmaking/horological, drill 0.28mm
T   0.35x0.075        in Bergeon No.30010 tap/die set, watchmaking
=== M0.35x0.09        S0.35x0.09, S0.35, .35 UNM, ISO secondary, ISO screws/bolts/nuts, ASA B1.10, ASME B1.10M secondary, GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.35x0.09         watchmaking, Horotec taps, Bergeon 2659 dies; common?
H   0.35-254          Waltham watch screw thread, size 23, historical, watchmaking/horological, 0.35x0.1
@   0.014-300         Whitworth Instrument, 47.5°, size 14, 0.356x0.085
=====27 AWG           American Wire Gauge, Brown&Sharpe, 0.0142", 0.361mm; copper conductors, 0.102mm2, 168.9mΩ/m
=====28 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.01425", 0.3620mm; injection needle, inner dia 0.184mm, blue-green
H   0.367x0.087       Latard thread no.20, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
@   22BA              BA 22, 0.37x0.098, 47.5°, British Association standard BS 93; small size rarely used
H   0.372x0.099       FS -22, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 22, 0.0146-257.9
=====28 SWG           British Standard Wire Gauge, 0.0148", 0.3759mm
H   0.0148-320        Elgin watch screw thread, historical, 0.3759x0.0794
H   0.376x0.096       Bourgeaux thread no.19, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
H   0.395x0.094       Latard thread no.19, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.4x0.1           Progress thread size 4, historical
H   40 NHS            0.40x0.10, 50°, NHS 56100; Serie suisse
=== M0.4x0.1          S0.40x0.1, S0.40, .40 UNM; ISO primary, ISO screws/bolts/nuts, DIN, German horological metric, "French Metric", French horological 50°, ASA B1.10, ASME B1.10M, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.40x0.100        no.3 Bergeon tap, watchmaking/horological, drill 0.32mm; Horotec taps, Wiru/Bergeon 2659 dies
T   M0.40x0.10        in Wiru No.2, Bergeon 30010 tap/die set, watchmaking
T   0.4x0.10          tap/die present in an antique Japanese watchmaker toolset, https://www.practicalmachinist.com/vb/antique-machinery-and-history/tiny-marvel-swiss-tap-die-set-345158/
H   0.40x0.11         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
=====26 AWG           American Wire Gauge, Brown&Sharpe, 0.0159", 0.405mm; copper conductors, 0.129mm2, 133.9mΩ/m, 1.3..2.2 amps (60/75°C)
@   0.016-300         Whitworth Instrument, 47.5°, size 16, 0.406x0.085
=====27 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.01665", 0.4128mm; injection needle, inner dia 0.210mm, medium gray
H   0.414x0.101       Bourgeaux thread no.18, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====27 SWG           British Standard Wire Gauge, 0.0164", 0.4166mm
H   0.0168-260        Elgin watch screw thread, historical, 0.4267x0.0977
H   0.426x0.109       FS 21, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 21, 0.0168-233
@   21BA              BA 21, 0.42x0.11, 47.5°, British Association standard BS 93; small size rarely used
H   0.432x0.102       Latard thread no.18, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
@   0.017-250         Whitworth Instrument, 47.5°, size 17, 0.432x0.102
H   0.45x0.1          Progress thread size 4 1/2, historical
H   45 NHS            0.45x0.10, 50°, NHS 56100; Serie suisse
====M0.45x0.1         S0.45, .45 UNM, ISO secondary, ISO screws/bolts/nuts, "French Metric", French horological 50°, ASA B1.10, ASME B1.10M secondary, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963)
    0.45x0.100        no.4 Bergeon tap, watchmaking/horological, drill 0.37mm; Horotec taps, Wiru/Bergeon 2659 dies; uncommon?
T   0.45x0.10         tap/die present in an antique Japanese watchmaker toolset, Bergeon 30010 tap/die set
H   0.45-240          Waltham watch screw thread, size 21, historical, watchmaking/horological, 0.45x0.106
H   0.45x0.11         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
H   0.452x0.111       Bourgeaux thread no.17, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====25 AWG           American Wire Gauge, Brown&Sharpe, 0.0179", 0.455mm; copper conductors, 0.162mm2, 106.2mΩ/m
=====26 SWG           British Standard Wire Gauge, 0.018", 0.4572mm
@   0.018-250         Whitworth Instrument, 47.5°, size 18, 0.457x0.102
=====26 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.01825", 0.4636mm; injection needle, inner dia 0.260mm, brown
@   20BA              BA20, 0.48x0.12, 47.5°, British Association standard BS 93; small size rarely used
H   0.479x0.122       FS 20, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 20, 0.0189-208.2
H   0.479x0.109       Latard thread no.17, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
@   0.019-250         Whitworth Instrument, 47.5°, size 19, 0.483x0.102
H   0.496x0.120       Bourgeaux thread no.16, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
H   0.5x0.125         Progress thread size 5, historical
H   50 NHS            0.50x0.125, 50°, NHS 56100; Serie suisse
=== M0.5x0.125        S0.50x0.125, S0.50, .50 UNM; ISO primary, ISO screws/bolts/nuts, DIN, German horological metric, "French Metric", French horological 50°, ASA B1.10, ASME B1.10M, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.50x0.125        no.5 Bergeon tap, watchmaking/horological, drill 0.40mm; Horotec taps, Wiru/Bergeon 2659 dies
T   M0.50x0.125       in Wiru No.2, Bergeon 30010 tap/die set, watchmaking
H   0.50x0.13         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
T   0.5x0.13          tap/die present in an antique Japanese watchmaker toolset
=====25 SWG           British Standard Wire Gauge, 0.020", 0.5080mm; common music wire for thinner springs
@   0.02-210          Whitworth Instrument, 47.5°, size 20, 0.508x0.121
=====24 AWG           American Wire Gauge, Brown&Sharpe, 0.0201", 0.511mm; copper conductors, 0.205mm2, 84.22mΩ/m, 2.1..3.5 amps (60/75°C)
=====25 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.02025", 0.5144mm; injection needle, inner dia 0.260mm, orange
H   0.0208-220        Elgin watch screw thread, historical, 0.5283x0.115
=== #0000-160         0.021-160  S0.53x0.0159; old standard miniature instruments thread; not recommended for new designs
W   0000-??           wood screw #0000, unusually small
H   0.529x0.115       Latard thread no.16, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.543x0.135       FS 19, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 19, 0.0214-188.1
@   19BA              BA 19, 0.54x0.14, 47.5°, British Association standard BS 93; small size rarely used
H   0.55-220          Waltham watch screw thread, size 19, historical, watchmaking/horological, 0.55x0.115
H   0.55x0.125        Progress thread size 5 1/2, historical
H   55 NHS            0.55x0.125, 50°, NHS 56100; Serie suisse
====M0.55x0.125       S0.55, .55 UNM, ISO secondary, ISO screws/bolts/nuts, "French Metric", French horological 50°, ASA B1.10, ASME B1.10M secondary, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963)
    0.55x0.125        no.6 Bergeon tap, watchmaking/horological, drill 0.45mm; Bergeon 2659 dies; uncommon
T   0.55x0.125        in Bergeon 30010 tap/die set, watchmaking
H   0.55x0.13         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
=====24 SWG           British Standard Wire Gauge, 0.022", 0.559mm
@   0.022-210         Whitworth Instrument, 47.5°, size 22, 0.559x0.121
H   0.563x0.133       Bourgeaux thread no.15, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====24 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.02225", 0.5652mm; injection needle, inner dia 0.311mm, medium purple
=====23 AWG           American Wire Gauge, Brown&Sharpe, 0.0226", 0.573mm; copper conductors, 0.258mm2, 66.79mΩ/m
H   0.0228-260        Elgin watch screw thread, historical, 0.5791x0.0977
H   0.591x0.126       Latard thread no.15, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.6x0.15          Progress thread size 6, historical
H   60 NHS            0.60x0.150, 50°, NHS 56100; Serie suisse
H   0.60x0.15         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
=== M0.6x0.15         S0.60x0.15, S0.60, .60 UNM; ISO primary, ISO screws/bolts/nuts, DIN, German horological metric, "French Metric", French horological 50°, ASA B1.10, ASME B1.10M, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.60x0.150        no.7 Bergeon tap, watchmaking/horological, drill 0.48mm; Horotec taps, Wiru/Bergeon 2659 dies
    M0.6x0.15         eyeglass screws
    M0.6              super micro screw for medical and other precision instruments
T   M0.60x0.15        in Wiru No.2, Bergeon 30010 tap/die set, watchmaking; tap/die present in an antique Japanese watchmaker toolset
=====23 SWG           British Standard Wire Gauge, 0.024", 0.610mm
@   0.024-210         Whitworth Instrument, 47.5°, size 24, 0.61x0.121
H   0.0248-220        Elgin watch screw thread, historical, 0.62x0.115
H   0.616x0.150       FS 18, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 18, 0.0243-169.3
@   18BA              BA 18, 0.62x0.15, 47.5°, British Association standard BS 93; small size rarely used
=====24 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 1/40", 0.0250", 0.635mm
H   0.640x0.150       Bourgeaux thread no.14, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====23 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.02525", 0.6414mm; injection needle, inner dia 0.337mm, deep blue
=====22 AWG           American Wire Gauge, Brown&Sharpe, 0.0253", 0.644mm; copper conductors, 0.326mm2, 52.96mΩ/m, 3..7 amps (60/75°C)
H   0.65-200          Waltham watch screw thread, size 17, historical, watchmaking/horological, 0.65x0.127
H   0.65x0.15         Progress thread, size 6 1/2, historical
H   0.65x0.15         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
====M0.65x0.15
    0.65x0.150        no.8 Bergeon tap, watchmaking/horological, drill 0.53mm; Bergeon taps, Wiru/Bergeon 2659 dies
T   M0.65x0.15        in Wiru No.2, Bergeon 30010 tap/die set, watchmaking
@   0.026-180         Whitworth Instrument, 47.5°, size 26, 0.66x0.141
H   0.662x0.163       Fontainemelon thread no.2, depth 0.083 mm, watchmaking company, historical
H   0.665x0.138       Latard thread no.14, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.0268-180        Elgin watch screw thread, historical, 0.6807x0.141
H   0.699x0.167       FS 17, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 17, 0.0275-152.1
@   17BA              BA 17, 0.70x0.17, 47.5°, British Association standard BS 93; small size rarely used
H   0.70x0.17         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
T   0.7x0.17          tap/die present in an antique Japanese watchmaker toolset
H   0.7x0.175         Progress thread, size 7, historical
H   70 NHS            0.70x0.175, 50°, NHS 56100; Serie suisse
=== M0.7x0.175        S0.70x0.175, S0.70, .70 UNM, ISO secondary, ISO screws/bolts/nuts, DIN, German horological metric, "French Metric", French horological 50° (x0.50??? - Guide to World Screw Threads), ASA B1.10, ASME B1.10M secondary, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.70x0.175        no.9 Bergeon tap, watchmaking/horological, drill 0.56mm; Horotec taps, Wiru/Bergeon 2659 dies; common?
    M0.7              on watches
T   M0.70x0.175       in Wiru No.2, Bergeon 30010 tap/die set, watchmaking
=====22 SWG           British Standard Wire Gauge, 0.028", 0.711mm
@   0.028-180         Whitworth Instrument, 47.5°, size 28, 0.711x0.141
H   0.713x0.159       Bourgeaux thread no.13, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====23 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 9/320", 0.028125", 0.7144mm
H   0.715x0.182       Fontainemelon thread no.3, depth 0.082 mm, watchmaking company, historical
=====22 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.02825", 0.7176mm; injection needle, inner dia 0.413mm, black
=====21 AWG           American Wire Gauge, Brown&Sharpe, 0.0285", 0.723mm; copper conductors, 0.410mm2, 42.00mΩ/m
H   0.0288-220        Elgin watch screw thread, historical, 0.732x0.115
H   0.736x0.149       Latard thread no.13, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.75x0.17         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
    0.75x0.175        no.10 Bergeon tap, watchmaking/horological, drill 0.61mm; Horotec taps, Bergeon 2659 dies; uncommon
T   0.75x0.175        in Bergeon No.30010 tap/die set, watchmaking
H   0.75x0.175        Progress thread, size 7 1/2, historical
@   0.03-180          Whitworth Instrument, 47.5°, size 30, 0.762x0.141
H   0.03-140          0.76x0.181, watch button thread, historical, size 12 Swiss
H   0.0308-220        Elgin watch screw thread, historical, 0.782x0.115
H   0.0308-180        Elgin watch screw thread, historical, 0.782x0.141
H   0.782x0.167       Bourgeaux thread no.12, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====22 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 1/32", 0.03125", 0.7938mm
H   0.794x0.185       FS 16, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 16, 0.0313-137.3
@   16BA              BA 16, 0.79x0.19, 47.5°, British Association standard BS 93-1951
H   0.798x0.164       Latard thread no.12, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.80x0.19         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
H   0.8x0.2           Progress thread, size 8, historical
H   80 NHS            0.80x0.200, 50°, NHS 56100; Serie suisse
=== M0.8x0.2          S0.80x0.2, S0.80, .80 UNM; ISO primary, ISO screws/bolts/nuts, DIN, German horological metric, "French Metric", French horological 50°, ASA B1.10, ASME B1.10M, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.80x0.200        no.11 Bergeon tap, watchmaking/horological, drill 0.64mm; Horotec taps, Wiru/Bergeon 2659 dies; common
    M0.8              on watches
    M0.8              on body jewellery/piercing, internal thread on some 18ga/1mm and 16-gauge/1.2mm; much less common than M0.9
    M0.8x0.20         eyeglass screws
    M0.8              on eyeglasses/spectacles; smallest nosepad screws (usual size M1)
    M0.8              watch strap links, uncommon; also M1, M1.1, M1.2 (common), M1.4 (common)
T   0.8x0.20          in Wiru No.2 tap/die set, watchmaking; tap/die present in an antique Japanese watchmaker toolset, Bergeon 30010 tap/die set
s   0.8x0.2           self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
s   0.8x0.35          self-tapping screws, Uni-Mag, for magnesium alloys
=====0.5mm2 wire      0.81mm dia, electrical wire, IEC 60228 standard size
=====20 AWG           American Wire Gauge, Brown&Sharpe, 0.0320", 0.812mm; copper conductors, 0.518mm2, 33.31mΩ/m, 5..11 amps (60/75°C)
=====21 SWG           British Standard Wire Gauge, 0.032", 0.813mm
H   0.812x0.206       Fontainemelon thread, depth 0.107 mm, watchmaking company, historical
H   0.813x0.216       Fontainemelon thread, depth 0.092 mm, watchmaking company, historical
H   0.813x0.216       Fontainemelon thread no.4, depth 0.103 mm, watchmaking company, historical
@   0.032-180         Whitworth Instrument, 47.5°, size 32, 0.813x0.141
=====21 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.03225", 0.8192mm; injection needle, inner dia 0.514mm, deep green
H   0.83-180          Waltham watch screw thread, size 15, historical, watchmaking/horological, 0.83x0.141
H   0.829x0.207       Fontainemelon thread, depth 0.098 mm, watchmaking company, historical
H   0.033-140         0.84x0.181, watch button thread, historical, size 11 Swiss
H   0.85x0.19         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
    0.85x0.200        no.12 Bergeon tap, watchmaking/horological, drill 0.69mm; Bergeon taps, Bergeon 2659 dies
T   0.85x0.200        in Bergeon 30010 tap/die set, watchmaking
H   0.85x0.2          Progress thread, size 8 1/2, historical
H   0.858x0.181       Bourgeaux thread no.11, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====#000 screw       wood/machine screw gage; 0.03152" 0.8006mm (American Screw Co. old standard), 0.034" 0.863mm (ASME?)
@   0.034-150         Whitworth Instrument, 47.5°, size 34, 0.864x0.169
=== #000-120          0.034-120  S0.86x0.212; old standard miniature instruments thread; not recommended for new designs
    000-120           small machine screws, eg. in electronics; Torx Plus
    #000-120          on body jewellery/piercing, internal thread on 18gauge(AWG)/1mm and 16ga(AWG)/1.2mm piercing, imperial version (see also M0.8, M0.9, M1.2); sometimes mates with M0.9
H   0.034-110         0.86x0.231, watch button thread, historical, size 10 Swiss
W   000-??            wood screw #000, unusually small
H   0.870x0.180       Latard thread no.11, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
=====21 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 11/320", 0.034375", 0.8731mm
H   0.035-110         0.89x0.231, watch button thread, historical, size 10A Swiss
H   0.901x0.206       FS 15, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 15, 0.0355-123.3
====M0.9x0.2          "French Metric", French horological 50°
@   15BA              BA 15, 0.90x0.21, 47.5°, British Association standard BS 93-1951; odd gauge, not recommended for general use
H   0.90x0.21         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
T   0.9x0.22          tap/die present in an antique Japanese watchmaker toolset
H   0.900x0.224       Fontainemelon thread, depth 0.116 mm, watchmaking company, historical
H   90 NHS            0.90x0.225, 50°, NHS 56100; Serie suisse
=== M0.9x0.225        S0.90x0.225, S0.90, .90 UNM, ISO secondary, ISO screws/bolts/nuts, DIN, German horological metric, ASA B1.10, ASME B1.10M secondary, NHS 56100 (50°) (from 1923), GOST 9000-73, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    0.90x0.225        no.13 Bergeon tap, watchmaking/horological, drill 0.72mm; Horotec taps, Wiru/Bergeon 2659 dies; common
T   M0.90x0.225       in Wiru No.2, Bergeon 30010 tap/die set, watchmaking
!   M0.9              on body jewellery/piercing, "T0.9", internal thread on some 18ga(AWG)/1mm and most 16-gauge(AWG)/1.2mm piercings (cartilage/helix, conch, rook, tragus, daith, facial, cheek, septum, genital, surface); see also #000-120; don't mistake for M0.8
H   0.9x0.225         Progress thread, size 9, historical
H   0.906x0.223       Fontainemelon thread, depth 0.117 mm, watchmaking company, historical
H   0.907x0.225       Fontainemelon thread no.5, depth 0.121 mm, watchmaking company, historical
=====20 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.03575", 0.9081mm; injection needle, inner dia 0.603mm, yellow
=====19 AWG           American Wire Gauge, Brown&Sharpe, 0.0359", 0.912mm; copper conductors, 0.653mm2, 26.42mΩ/m
=====20 SWG           British Standard Wire Gauge, 0.036", 0.914mm
@   0.036-150         Whitworth Instrument, 47.5°, size 36, 0.914x0.169
H   0.036-113         0.91x0.225, watch button thread, historical, size 10 US
H   0.036-110         0.91x0.231, watch button thread, historical, size 10B
H   0.0368-220        Elgin watch screw thread, historical, 0.92x0.0268
H   0.0368-140        Elgin watch screw thread, historical, 0.92x0.028
H   0.93-160          Waltham watch screw thread, size 9, historical, watchmaking/horological, 0.93x0.159
H   0.936x0.200       Bourgeaux thread no.10, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
H   0.95x0.21         watchmakers' screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise
    0.95x0.225        no.14 Bergeon tap, watchmaking/horological, drill 0.77mm; Bergeon 2659 dies
T   0.95x0.225        in Bergeon 30010 tap/die set, watchmaking
H   0.95x0.225        Progress thread, size 9 1/2, historical
=====20 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 3/80", 0.0375", 0.9525mm
H   0.956x0.196       Latard thread no.10, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
@   0.038-120         Whitworth Instrument, 47.5°, size 38, 0.965x0.212
=====0.75mm2 wire     0.99mm dia, electrical wire, IEC 60228 standard size
H   0.039-110         0.99x0.231, watch button thread, historical, size 9 Swiss
H   1-180             Waltham watch screw thread, size 13, historical, watchmaking/horological, 1x0.141
====M1x0.15           S1.00x0.15
H   1-140             Waltham watch screw thread, size 7, historical, watchmaking/horological, 1x0.181
=== M1x0.2            S1.00x0.20; ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine, DIN fine, ISA B (1940), SI M.MB, DIN 13-2, GOST 9150-59 constant, GOST 24705-81
s   1x0.2             self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
@   14BA              BA 14, 1.00x0.23, 47.5°, British Association standard BS 93-1951
H   1x0.23            watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   1.00x0.24         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie francaise, Serie de la Societe d'Encouragement
H   039               1.00x0.25, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal, preferred size
H   Lh1x0.25          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
H   1x0.25            Progress thread, size 10, historical
H   1.00x0.25         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915, superseded
H   100 NHS(?)        1.00x0.25, NHS 56100; Serie suisse
H   M1x0.25           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI, matches standard ISO coarse
=== M1(x0.25)         S1x0.25, S1.00, 1.00 UNM; ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, German horological metric, BS 3643-1:1981 1st coarse, DIN coarse, DIN 13-1, ISA A (1940), SI M.MA plus France except Japan, "French Metric" (as of ISA 1940), French horological 60°, ASA B1.10, ASME B1.10M, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    1.00x0.250        no.15 Bergeon tap, watchmaking/horological, drill 0.80mm; Horotec taps, Wiru/Bergeon 2659 dies; common
    M1x0.25           small machine screws, eg. in electronics; Torx Plus
    M1.0x0.25         eyeglass screws
    M1                on eyeglasses/spectacles; nosepad screws, standard, 1.4mm-dia head
    M1                common wristwatch case screw size; also M1.2, M1.4
    M1                watch strap links, uncommon; also M0.8, M1.1, M1.2 (common), M1.4 (common)
    M1                on body jewellery/piercing, internal thread on some 16-gauge(AWG)/1.2mm; less common than M0.9, M0.8 and #000-120
    M1x0.25           dental implants, very rare
T   M1.0x0.25         in Wiru No.1, No.2, Bergeon 30010 tap/die set, watchmaking
T   1.0x0.25          tap/die present in an antique Japanese watchmaker toolset
s   M1x?              small self-tapping screws
s   1x0.4             self-tapping screws, Uni-Mag, for magnesium alloys
s   1x0.44            self-tapping screws, Delta PT, for plastics, for wide range of thermoplastics
s   1x0.55            self-tapping screws, Remform II, for plastic; 30° asymmetric, round thread tip
H   1.008x0.219       Bourgeaux thread no.9, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====19 SWG           British Standard Wire Gauge, 0.040", 1.016mm
@   0.04-120          Whitworth Instrument, 47.5°, size 40, 1.016x0.212
=====18 AWG           American Wire Gauge, Brown&Sharpe, 0.0403", 1.024mm; copper conductors, 0.823mm2, 20.95mΩ/m, 10..16 amps (60/90°C); usual thermostat and HVAC wiring
H   1.029x0.316       Fontainemelon thread no.11, depth 0.125 mm, watchmaking company, historical
H   0.0408-200        Elgin watch screw thread, historical, 1.036x0.127 (Guide to World Screw Threads)
H   1.036x0.209       Latard thread no.9, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.0408-120L       Elgin watch screw thread, historical, 1.036x0.212, LH/left
H   0.041-120         1.03x0.212, watch button thread, historical, size 9 Elgin
    1.05x0.250        no.16 Bergeon tap, watchmaking/horological, drill 0.85mm; Bergeon/Horotec taps, Bergeon 2659 dies; uncommon
T   1.05x0.250        in Bergeon 30010 tap/die set, watchmaking
=====19 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.042", 1.067mm; injection needle, inner dia 0.686mm, cream
H   1.072x0.289       Fontainemelon thread, depth 0.154 mm, watchmaking company, historical
H   0.0428-120        Elgin watch screw thread, historical, 1.087x0.212 (Guide to World Screw Threads)
H   0.043-100         1.092x0.254, watch button thread, historical, size 8
H   1.097x0.239       Bourgeaux thread no.8, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
====M1.1x0.2          ISO secondary fine, BS 3643-1:1981 2nd fine, DIN 13-2, GOST 9150-59 constant, GOST 24705-81
    M1.1              on eyeglasses/spectacles; nosepad screws, uncommon
H   1.1-120           Waltham watch screw thread, size 5, historical, watchmaking/horological, 1.1x0.212
H   1.10x0.24         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
H   043               1.10x0.25, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal
=== M1.1x0.25         S1.1x0.25, S1.1, 1.10 UNM; ISO secondary coarse, ISO screws/bolts/nuts, BS 3643-1:1981 2nd coarse DIN 13-1, ASA B1.10, ASME B1.10M secondary, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81, UNM (H28 1963)
    1.10x0.250        no.17 Bergeon tap, watchmaking/horological, drill 0.90mm; Horotec taps, Wiru/Bergeon 2659 dies
T   M1.10x0.25        in Wiru No.2, Bergeon 30010 tap/die set, watchmaking; tap/die present in an antique Japanese watchmaker toolset
    M1.1              on interchangeable jewellery findings; "Beach Buggy" "invisible"; common with tiny lampwork beads; also M2.5
    M1.1              watch strap links, uncommon; also M0.8, M1, M1.2 (common), M1.4 (common)
H   1.1x0.275         Progress thread, size 11, historical
H   1.102x0.229       FS 14, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 14, 0.0434-110.9
H   1.106x0.219       Latard thread no.8, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
=====19 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 7/160", 0.0438", 1.117mm
H   0.0448-110        Elgin watch screw thread, historical, 1.138x0.231 (Guide to World Screw Threads)
=====1mm2 wire        1.14mm dia, electrical wire, IEC 60228 standard size
@   0.045-120         Whitworth Instrument, 47.5°, size 45, 1.143x0.212
=====17 AWG           American Wire Gauge, Brown&Sharpe, 0.0453", 1.150mm; copper conductors, 1.04mm2, 16.61mΩ/m; common music wire for thicker springs
H   1.16x0.254        FS 13, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 13, 0.0457-100
    M1.16x0.25        eyeglass screws
    1.16x?            on Ray-Ban spectacles
    1.16-90(?)        on eyeglasses/spectacles; rimless screw (SA112), eyewire; Ray-Ban nose pads and trim screws; Ray-Ban, B&L
H   1.181x0.233       Latard thread no.7, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.0468-110        Elgin watch screw thread, historical, 1.189x0.231 (Guide to World Screw Threads)
@   3/64-72
    3/64-72           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), 1.191x0.353
@   3/64-60
    3/64-60           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), 1.191x0.423
=====#00 screw        wood/machine screw gage; 0.04468" 1.1349mm (American Screw Co. old standard), 0.047" 1.194mm (ASME?)
====#00-112           M1.194x0.227; old standard miniature instruments thread, not recommended for new designs; less common than 00-90, 00-96; Sellers
H   0.047-110         1.194x0.231, watch button thread, historical, size 3, size 6, size 7
====#00-96 NS         M1.194x0.265; old standard miniature instruments thread, not recommended for new designs; less common than 00-90
=== #00-90 NS         0.047-90, M1.194x0.282; old standard miniature instruments thread; not recommended for new designs
    00-90             small machine screws, eg. in electronics; Torx Plus
    00-90             on eyeglasses/spectacles; also 1.16mm; lens/rimless screw, eyewires, hinges (USA), nuts for nose studs
    00-90             on some jewelry
    00-90             some Macbook Pro chassis screws
    00-51             thread-forming screws, Plastite, for plastics
W   00-??             wood screw #00, unusually small
    #00 wood          model trains, for mounting H0 track sections; Marklin; or for mounting bridge sections on bridge pillars (Märklin Z) (can't be found elsewhere, can be #0?)
====M1.2x0.15         S1.2x0.15
=== M1.2x0.2          S1.2x0.2, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine; SI M.MB, ISA B (1940), DIN 13-2, GOST 9150-59 constant, GOST 24705-81
H   1.2-110           Waltham watch screw thread, size 3, historical, watchmaking/horological, 1.2x0.231
H   1.2-110           watch crown thread, size 5/0-10/0, historical, 1.2x0.231
H   Lh1.2x0.25        Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
H   1.2x0.25          watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   047               1.20x0.25, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal, preferred size
=== M1.2(x0.25)       S1.2x0.25, S1.2, 1.20 UNM; ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, German horological metric, BS 3643-1:1981 1st coarse, DIN coarse, DIN 13-1, SI M.MA plus France except Japan, "French Metric" (as of ISA 1940), French horological 60°, ISA A (1940), ASA B1.10, ASME B1.10M, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    1.20x0.250        no.18 Bergeon tap, watchmaking/horological, drill 1.00mm; Horotec taps, Wiru/Bergeon 2659 dies
    M1.2x0.25         small machine screws, eg. in electronics; Torx Plus
    M1.2x0.25         eyeglass screws
    M1.2              on eyeglasses hinges, common, less common than M1.4
    M1.2              on eyeglasses/spectacles; eyewires, softwing nosepads, hinges (less common than M1.4), nuts; common on rimless; 2mm head and 4.7/6.7/8.7mm length == typical "eyewire screw" for smaller frames
    M1.2              common wristwatch case screw size; also M1, M1.4; very common watch size
    M1.2              watch strap links, common; also M0.8, M1, M1.1, M1.4 (common)
    M1.2              Rolex bracelet link screws
!   M1.2              on body jewellery/piercing, "T1.2", internal thread on 14-gauge(AWG)/1.6mm and 12-gauge(AWG)/2mm piercings (dermal anchors, belly button, nipple, tongue, genital, surface), external on 18ga/1mm and 16-gauge/1.2mm
    M1.2x0.25         some miniature leadscrews
    M1.2x0.25         dental implants, very rare
T   M1.2x0.25         in Wiru No.1, No.2, Bergeon 30010 tap/die set, watchmaking; tap/die present in an antique Japanese watchmaker toolset
@   13BA              BA 13, 1.20x0.25, 47.5°, British Association standard BS 93-1951; odd gauge, not recommended for general use
s   1.2x0.25          self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
H   1.20x0.27         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
H   1.2x0.3           Progress thread, size 12, historical
s   M1.2x0.45         thread-forming screws for plastics, type 0, type 2 (?)
s   1.2x0.45          self-tapping screws, Uni-Mag, for magnesium alloys
s   1.2x0.51          self-tapping screws, Delta PT, for plastics, for wide range of thermoplastics
s   1.2x0.65          self-tapping screws, Remform II, for plastic; 30° asymmetric, round thread tip
H   1.203x0.261       Bourgeaux thread no.7, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====18 SWG           British Standard Wire Gauge, 0.048", 1.219mm
H   1.22x0.2260       Mechaniker thread no.36, 112.9/26 tpi, 50° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
H   0.0488-200        Elgin watch screw thread, historical, 1.240x0.127 (Guide to World Screw Threads), fine
H   0.0488-140        Elgin watch screw thread, historical, 1.240x0.181 (Guide to World Screw Threads), coarse
H   1.25x0.25         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915, superseded
H   M1.25x0.3         US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; not in ISO series
====M1.25             on eyeglasses/spectacles; relatively uncommon
s   M1.25x?           thread-forming screws for plastics
H   1.269x0.246       Latard thread no.6, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
=====18 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 1/20", 0.0500", 1.270mm
=====18 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.050", 1.270mm; injection needle, inner dia 0.838mm, pink
@   0.05-100          Whitworth Instrument, 47.5°, size 50, 1.27x0.254
    1.27-90(?)        oversized 00-90, 00-90+, or 0.05-90; on eyeglasses/spectacles; USA, typical hinge screw, eyewire; Ray-Ban hinge screw
=====16 AWG           American Wire Gauge, Brown&Sharpe, 0.05082", 1.29083mm; copper conductors, 1.31mm2, 13.17mΩ/m, 18 amps (90°C); smallest usual for 120V household wiring; dia of US baling wire, "haywire", "utility wire", "mechanic's wire", "Soft Annealed Mechanic's Wire, 18 AWG Industrial Grade"
H   0.0508-110L       Elgin watch screw thread, historical, 1.290x0.231, LH/left (Guide to World Screw Threads)
H   0.051-84          1.29x0.302, watch button thread, historical, size 4
H   051               1.30x0.25, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal
====M1.3x0.25         fine?
H   1.30x0.27         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
H   1.299x0.271       Bourgeaux thread no.6, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
@   12BA              BA 12, 1.30x0.28, 47.5°, British Association standard BS 93-1951, screw "X" (UK)
    M1.3x0.28         eyeglass screws
=== M1.3x0.30         NHS 56100 (60°) (from 1923)
    M1.3x0.28?/0.30?  on eyeglasses/spectacles; hinges, eyewires,  uncommon
    1.30x0.300        no.19 Bergeon tap, watchmaking/horological, drill 1.06mm; Horotec taps, Wiru/Bergeon 2659 dies
T   M1.30x0.30        in Wiru No.2 tap/die set, watchmaking; tap/die present in an antique Japanese watchmaker toolset
H   1.3x0.325         Progress thread, size 13, historical
H   1.32x0.282        FS 12, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 12, 0.052-90.1
H   1.34-170          Waltham watch screw thread, size 11, historical, watchmaking/horological, 1.34x0.149
====M1.35             on eyeglasses/spectacles; temple screws, etc.; relatively uncommon
H   1.363x0.262       Latard thread no.5, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.054-84          1.36x0.302, watch button thread, historical, size 5
    1.37x?            on Ray-Ban spectacles
H   1.38x0.2822       Mechaniker thread no.35, 90 tpi, 72° (size-specific); Siemens-Halske, German, in use until 1925, historical
H   0.0548-180        Elgin watch screw thread, historical, 1.392x0.141 (Guide to World Screw Threads)
@   0.055-100         Whitworth Instrument, 47.5°, size 55, 1.397x0.254
=====1.5mm2 wire      1.40mm dia, electrical wire, IEC 60228 standard size
=== M1.4x0.2          ISO secondary fine, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, DIN fine, SI M.MB, ISA B (1940), DIN 13-2, GOST 9150-59 constant, GOST 24705-81
====M1.4x.25          DIN 13-2
    M1.4x0.25         dental implants, very rare
H   Lh1.4x0.3         Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
H   055               1.40x0.30, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal, preferred size
H   1.40x0.30         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
=== M1.4(x0.3)        S1.4x0.3, S1.4, 1.40UNM; ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, German horological metric, BS 3643-1:1981 2nd coarse, DIN coarse, DIN 13-1, SI M.MA plus France except Japan, "French Metric" (as of ISA 1940), French horological 60°, ISA A (1940), ASA B1.10, ASME B1.10M secondary, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81, UNM (H28 1963), Swiss horological NIHS 06-02
    1.40x0.300        no.20 Bergeon tap, watchmaking/horological, drill 1.16mm; Horotec taps, Wiru/Bergeon 2659 dies
!   M1.4x0.3          common in cellphones
    M1.4x0.30         eyeglass screws
    M1.4x0.3          common on eyeglasses/sunglasses hinges, by far most common, length usually 3/3.5/4/4.5/5 mm; can also be self-tapping (different pitch?)
    M1.4              on eyeglasses/spectacles; hinges (most common), eyewires, nosepads, front/bridge, nuts; 9mm long for large frames; 2mm head and 3/3.5/4/5mm length == typical "eyewire screw" for sm
    M1.4              dental implants, internal thread; in smaller implants, less common than M1.6; see also M1.6, M1.8, 1-72, M2, M2.5
    M1.4              common wristwatch case screw size; also M1, M1.2
    M1.4              watch strap links, common; also M0.8, M1, M1.1, M1.2 (common)
    M1.4              on some dial indicators; stem/tip/contact point attachment; also #4-48, M2.5, M2, M1.6
    1.4x?             on some jewelry; Nunn Design Micro Screws
    M1.4x0.3          microwave tuning screws
T   M1.4x0.30         in Wiru No.1, No.2 tap/die set, watchmaking; tap/die present in an antique Japanese watchmaker toolset
s   1.4x0.3           self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
H   1.4x0.35          Progress thread, size 14, historical
s   M1.4x0.45         self-tapping screws type B, type AB, type 25
s   M1.4x0.5          self-tapping screws type 0, type 2
s   1.4x0.5           self-tapping screws, Uni-Mag, for magnesium alloys
s   1.4x0.57          self-tapping screws, Delta PT, for plastics, for wide range of thermoplastics
s   MG1.4x0.60        thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
s   1.4x0.6           wood screws, DIN
s   1.4x0.75          self-tapping screws, Remform II, for plastic; 30° asymmetric, round thread tip
H   1.404x0.274       Bourgeaux thread no.5, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====17 SWG           British Standard Wire Gauge, 0.056", 1.422mm
=====17 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 9/160", 0.0563", 1.42mm
H   0.056-62 CEI      1.42x0.410, Original Cycle, British bicycles, 60°, historical; matches 17-swg gauge wire
@   17 IWG            0.056-62, 1.422x0.41, Imperial Wire Gauge, for bicycle/motorcycle wheel spokes/nipples
H   0.056-56          coarser variant of 0.056-62
=====15 AWG           American Wire Gauge, Brown&Sharpe, 0.0571", 1.450mm; copper conductors, 1.65mm2, 10.45mΩ/m
====M1.45
    M1.45             on eyeglasses/spectacles; relatively uncommon
H   1.464x0.284       Latard thread no.4, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
=====17 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.058", 1.473mm; injection needle, inner dia 1.07mm, red-violet
H   0.058-84          1.47x0.302, watch button thread, historical, size 2 (pin lever)
T   17E 72            0.058-72, 1.47x0.353, in antique bicycle thread tap/die set, wheel spoke, #17 gauge wire
T   17E 56            0.058-56, 1.47x0.454, in antique bicycle thread tap/die set, wheel spoke, #17 gauge wire
H   1.5-110           Waltham watch screw thread, size 1, historical, watchmaking/horological, 1.5x0.231
H   059               1.50x0.30, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal
H   1.50x0.30         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
=== M1.5x0.3          NHS 56100 (60°) (from 1923)
    1.5x0.3           watchmaking; Horotec taps, Bergeon 2659 dies; common?
H   1.5x0.31          watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   1.49x0.314        FS 11, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 11, 0.0587-80.9
@   11BA              BA 11, 1.50x0.31, 47.5°, British Association standard BS 93-1951; odd gauge, not recommended for general use
T   1.5x0.34          tap/die present in an antique Japanese watchmaker toolset
H   1.50x0.35         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915, superseded
====M1.5(x0.35)       not in ISO/DIN but in common(ish) use in jewellery/clocks, rarely if ever in big industry; "series G" (TM 9-254, 1958)
    1.50x0.350        no.21 Bergeon tap, watchmaking/horological, drill 1.26mm
    M1.5              on eyeglasses/spectacles; hinges, eyewires, nuts; uncommon
    M1.5              dental implants, internal thread; unusual, some smaller Italian implants - Oxy Implants; see also M1.4, M1.6, M1.8, 1-72, M2, M2.5
H   1.5x0.375         Progress thread, size 15, historical
M   HA 1.5            1.5x0.5, medical implants, bone screws, shallow thread; cortical bone screw, phalangeal; asym thread 35/3° rounded, minor dia 1.1mm, drill 1.1mm; DIN 58810, ISO 5835:1991
s   M1.5x?            small self-tapping screws, less common
=== ST1.5(x1.4)       self-tapping ISO #0; ISO 1478, EN 21478, DIN 7970; 60°; less common size
=====#0 screw         wood/machine screw gage; 0.05784" 1.4691mm (American Screw Co. old standard) or 0.060" 1.524mm (ASME)
@   0.06-100          Whitworth Instrument, 47.5°, size 60, 1.524x0.254
H   1.523x0.289       Bourgeaux thread no.4, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=== #0(-80) UNF       0.060-80 UNF, primary size, M1.524x0.3175 (1.32mm?), screw "Y" (US), ASME standard (1907, Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF (H28 1963), "series A" (TM 9-254, 1958), JIS B 0212, aeronautical (H28 1944)
    0-80              small machine screws, eg. in electronics; Torx Plus
    0-80              musical instruments, Selmer Cl Flat Spring Screw/Flute Flat Spring Screw/Flute Pad Spuds/Sax Flat Spring Screw
    0-80              on some jewelry, also #1-72
    0-80              on some body jewellery/piercing, internal thread on 12ga(AWG)/2mm, 10ga/2.4mm and 8ga(AWG)/3mm piercings, imperial version (see also M1.6, M1.2)
    0-80              dental implants, very rare
@   0-72 NS
====0-64 UNS
    0-64              on US eyeglasses/spectacles; often used on traditional B&L frames; thread size 0-64 is used primarily in optical eyewear and jewelry
s   0-48              1.52x0.53; self-tapping screws type B
s   0-40              1.52x0.635; self-tapping screws type A
s   0-40              thread-rolling screws, Plastite alternative, 48deg 2-lead
s   0-42              thread-forming screws, Plastite, for plastics
W   0-32              wood screw #0, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1
H   1.53-80           watch crown thread, size 12-6-0, historical, 1.53x0.318
    M1.54x?           dental implants, internal thread; very unusual, only NobelActive; see also M1.4, M1.6, M1.8, 1-72, M2, M2.5
H   0.0608-110        Elgin watch screw thread, historical, 1.544x0.231 (Guide to World Screw Threads)
H   0.0608-110L       Elgin watch screw thread, historical, 1.544x0.231, LH/left (Guide to World Screw Threads)
H   0.06-80           1.55x0.318, watch button thread, historical, size 2 (pocket)
H   1.568x0.304       Latard thread no.3, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
*   1/16" BSP         ...see G1/16-28, W7.72x0.907
*   1/16" NPT         ...see M7.95x0.941
=====16 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 1/16", 0.0625", 1.5875mm
    1/16-80           sewing machines, Singer tap TE357, alternative #0-80 UNF
====1/16-72
    1/16-72           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), Sellers
@   1/16-64 NS
    1/16-64           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), USS?, "series C" (TM 9-254, 1958)
@   1/16(-60) BSW     British Standard Whitworth, small; 55°; W1.5875x0.423
====1/16-60           M1.588x0.423, Sellers
s   M1.59x0.60        thread-forming screws, Plastite, for plastics
*   1/16-28 BSP       ...see G1/16, W7.72x0.907
*   1/16-27 NPT       ...see M7.95x0.941
=== M1.6x0.2          ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine, DIN 13-2, GOST 9150-59 constant, GOST 24705-81
    M1.6x0.2          adjusting screws
====M1.6x0.25         S1.6x0.25
@   M1.6x0.25         DIN 13-2
====M1.6x0.3          ISO extended, SI M.MA France-only, "French Metric" (as of ISA 1940), French horological 60°
H   1.6x0.320         Progress thread, size 16, historical; fine (Guide to World Screw Thread)
H   1.60x0.33         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
T   1.6x0.34          tap/die present in an antique Japanese watchmaker toolset
H   M1.6x0.35         US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M1.6(x0.35)       M1.6; common; all smaller designated as S, as per ISO 1501; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81
    1.60x0.350        no.22 Bergeon tap, watchmaking/horological, drill 1.32mm; Horotec taps, Bergeon 2659 dies
!   M1.6x0.35         common in cellphones
    M1.6x0.35         on eyeglasses/sunglasses, less common than M1.4?
    M1.6              on eyeglasses/spectacles; some hinges (oversize), eyewires, uncommon; see also M1.4
    M1.6              on body jewellery/piercing, "T1.6", internal thread on 10-gauge(AWG)/2.4mm and 8-gauge(AWG)/3mm piercings, external on 14-gauge/1.6mm, 12ga/2mm and 10ga/2.4mm, less common than T0.9 and T1.2
    M1.6              dental implants, internal thread; most common standard smaller size (also M2); see also M1.4, M1.8, 1-72, M2, M2.5
    M1.6              on some dial indicators; stem/tip/contact point attachment; also #4-48, M2.5, M2, M1.4
    M1.6              electrical terminal blocks, pitch 2.54mm/0.1" (6amp)
L   M1.6x0.35         some miniature leadscrews
s   1.6x0.35          self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
H   1.6x0.457         Progress thread, size 16, historical
s   M1.6x0.5          self-tapping screws type B, type AB, type 25
s   1.6x0.55          self-tapping screws, Uni-Mag, for magnesium alloys
s   1.6x0.64          self-tapping screws, Delta PT, for plastics, for wide range of thermoplastics
s   M1.6x0.64         self-tapping screws type 0, type 2
s   M1.6x0.67         thread-rolling screws, EJOT PT style, for thermoplastics, 30°
s   MG1.6x0.70        thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
W   1.6x0.7           wood screws, DIN
W   1.6x0.8           wood screws, M/M
s   1.6x0.85          self-tapping screws, Remform II, for plastic; 30° asymmetric, round thread tip
=====16 SWG           British Standard Wire Gauge, 0.064", 1.626mm
=====14 AWG           American Wire Gauge, Brown&Sharpe, 0.0641", 1.628mm; copper conductors, 2.08mm2, 8.286mΩ/m, 15..25 amps (60/90°C); smallest usual for 120V household aluminium wiring
    0.064-56 BSC      or CEI; British bicycles; not in standard list, perhaps 16E 56, 0.065-56?; on wheel spokes
H   1.634x0.229       Fontainemelon thread, depth 0.141 mm, watchmaking company, historical
H   1.63x0.3023       Mechaniker thread no.34, 84 tpi, 55° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
H   0.064-62 CEI      1.63x0.410, Original Cycle, British bicycles, 60°, historical; matches 16-swg gauge wire
@   16 IWG            0.064-62, 1.626x0.41, Imperial Wire Gauge, for bicycle/motorcycle wheel spokes/nipples
H   0.064-56          coarser variant of 0.064-62
H   1.641x0.298       Bourgeaux thread no.3, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
H   1.64x0.349        FS 10, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 10, 0.0646-72.8
=====16 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.065", 1.651mm; injection needle, inner dia 1.19mm, white
@   0.065-80          Whitworth Instrument, 47.5°, size 65, 1.651x0.318
T   16E 56            0.065-56, 1.65x0.454, in antique bicycle thread tap/die set, wheel spoke, #16 gauge wire
====M1.7x0.2          SI M.MB, ISA B (1940), DIN fine
@   M1.7x0.25
H   1.703x0.325       Latard thread no.2, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   1.70x0.33         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
H   1.7x0.340         Progress thread, size 17, historical; fine (Guide to World Screw Thread)
T   1.7x0.34          tap/die present in an antique Japanese watchmaker toolset
H   1.7x0.35          watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh1.7x0.35        Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
====10BA              BA 10, 1.70x0.35, 47.5°, British Association standard BS 93-1951, screw "Y" (UK); alternative is M1.6
    10BA              on some jewellery, model trains
H   067               1.70x0.35, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal, preferred size
=== M1.7x0.35         ISO extended, SI M.MA plus Japan except France, German horological metric, ISA A (1940), NHS 56100 (60°) (from 1923); deleted from JIS B 0209 in 1969
    1.70x0.350        no.23 Bergeon tap, watchmaking/horological, drill 1.42mm; Horotec taps, Bergeon 2659 dies
 t  M1.7              small rotary tools, Dremel-style mandrels for wheel center hole 1/16" or 1.8mm; see also M2, M2.5
 t  M1.7              on some dial indicators; stem/tip/contact point attachment; also #4-48, M2.5, M2, M1.6; uncommon
    M1.7              on eyeglasses/spectacles; some hinges; uncommon
T   M1.7x0.35         in Wiru No.1 tap/die set, watchmaking
H   1.7x0.486         Progress thread, size 17, historical
s   M1.7x0.5          self-tapping screws type B, type AB, type 25
s   M1.7x0.64         self-tapping screws type 0, type 2
W   1.7x0.8           wood screws, DIN
H   1.75x0.35         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915, superseded
=====15 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 9/128", 0.070313", 1.778mm
@   0.07-80           Whitworth Instrument, 47.5°, size 70, 1.778x0.318
H   1.78x0.3463       Mechaniker thread no.33, 73.1/3 tpi, 59° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
=====2.5mm2 wire      1.80mm dia, electrical wire, IEC 60228 standard size
H   0.0708-180        Elgin watch screw thread, historical, 1.798x0.141 (Guide to World Screw Threads)
=== M1.8x0.2          ISO 261 2nd, ISO secondary fine, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, DIN 13-2, GOST 9150-59 constant, GOST 24705-81
====M1.8x0.25         DIN 13-2
H   1.797x0.320       Bourgeaux thread no.2, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
H   071               1.80x0.35, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal
=== M1.8(x0.35)       M1.8; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, JIS B 0209, DIN 13-1, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81
    1.80x0.350        no.24 Bergeon tap, watchmaking/horological, drill 1.52mm; Horotec taps, Bergeon 2659 dies
    M1.8              dental implants, internal thread; less common than M1.6 and M2; see also M1.4, M1.6, 1-72, M2, M2.5
    M1.8              screw for small carbide inserts, 5mm long (also M2.2, M2.5)
H   1.8x0.360         Progress thread, size 18, historical; fine (Guide to World Screw Thread)
H   1.80x0.36         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
====M1.8x0.4          SI M.MA France-only, "French Metric" (as of ISA 1940), French horological 60°
s   1.8x0.4           self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
H   1.80x0.4141       Mechaniker thread no.32, 61.1/3 tpi, 75° (size-specific); Siemens-Halske, German, in use until 1925, historical
@   Fg1.8             1.8x0.45, bicycle thread, not in DIN 79012
@   1.8-56            "1.8x56", 1.8x0.453, bicycle thread, spoke use, spoke #15 (15ga wire, 1.82mm) see also BC 1.8; rarely used
H   1.8x0.514         Progress thread, size 18, historical
s   1.8x0.6           self-tapping screws, Uni-Mag, for magnesium alloys
s   1.8x0.71          self-tapping screws, Delta PT, for plastics, for wide range of thermoplastics
s   1.8x0.8           thread-rolling screws, Plas-Fix, for plastic, 45° thread
s   1.8x0.8           Remform threadforming screws, for plastic; 30° asymmetric, round thread tip
s   1.8x0.85          self-tapping screws, Remform II, for plastic; 30° asymmetric, round thread tip
W   1.8x0.9           wood screws, M/M
=====13 AWG           American Wire Gauge, Brown&Sharpe, 0.0720", 1.828mm; copper conductors, 2.62mm2, 6.571mΩ/m
=====15 SWG           British Standard Wire Gauge, 0.072", 1.829mm
=====15 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.072", 1.829mm; injection needle, inner dia 1.37mm, blue-grey
H   0.072-62 CEI      1.83x0.410, Original Cycle, British bicycles, 60°, historical; matches 15-swg gauge wire
@   15 IWG            0.072-62, 1.829x0.41, Imperial Wire Gauge, for bicycle/motorcycle wheel spokes/nipples
H   0.072-56          coarser variant of 0.072-62; antique British bicycles; on bicycle wheel spokes
T   15E 56            0.072-56, 1.83x0.454, in antique bicycle thread tap/die set, wheel spoke, #15 gauge wire
=====#1 screw         wood/machine screw gage; 0.07100" 1.8034mm (American Screw Co. old standard) or 0.073" 1.854mm (ASME)
@   1-80
=== #1(-72) UNF       0.073-72, M1.854x0.352, secondary size, ASME standard (1907, Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF 2nd (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    1-72              on some jewelry, also #0-80
    1-72 UNF          dental implants, internal thread; seen in US-made systems; see also M1.4, M1.6, M1.8, M2, M2.5
    1-72              on some model trains; less common than 2-56
    1-72              musical instrument, Selmer Flute Pad Screw
=== #1(-64) UNC       0.073-64, M1.854x0.397, secondary size, ASME special, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC 2nd (H28 1963), "series A" (TM 9-254, 1958), Sellers, JIS B 0210, aeronautical (H28 1944), BS 1580:1962, American Screw Company (0.071-64, Machinists Handbook 1909)
====1-56 NS           ASME, NS, Sellers
    1-56              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    1-56 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
@   1-48
s   1-42              1.85x0.6; self-tapping screws type B
s   1-32              1.85x0.79; self-tapping screws type A
s   1-32              thread-forming screws, Plastite, for plastics
W   1-28              wood screw #1, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1, less common size
H   1.869x0.342       Latard thread no.1, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   1.884x0.304       Fontainemelon thread, depth 0.145 mm, watchmaking company, historical
H   0.074-72          1.88x0.353, watch button thread, historical, size 1
@   0.075-80          Whitworth Instrument, 47.5°, size 75, 1.905x0.318
H   1.90x0.36         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
H   1.9x0.380         Progress thread, size 19, historical; fine (Guide to World Screw Thread)
@   9BA               BA 9, 1.90x0.39, 47.5°, British Association standard BS 93-1951; odd gauge, not recommended for general use
H   1.9x0.543         Progress thread, size 19, historical
=== ST1.9(x0.6)       self-tapping ISO #1; ISO 1478, EN 21478, DIN 7970; 60°, less common size
H   1.910x0.380       Fontainemelon thread, depth 0.265 mm, watchmaking company, historical
s   M1.91x0.79        thread-forming screws, Plastite, for plastics
H   1.92x0.387        FS 9, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 9, 0.0756-65.6
H   1.93-72           watch crown thread, size 16, historical, 1.93x0.353
H   0.0768-110L       Elgin watch screw thread, historical, 1.951x0.231, LH/left (Guide to World Screw Threads)
H   0.0772-80L        Elgin watch screw thread, historical, 1.961x0.318, LH/left (Guide to World Screw Threads)
=====14 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 5/64", 0.078125", 1.984mm
@   5/64-72           Sellers
H   1.984x0.359       Bourgeaux thread no.1, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
@   5/64SM64          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100),  M1.984x0.397
    5/64-64           sewing machines, Singer tap TE218, alternative #1-64 UNC
@   5/64-60           USS
@   5/64(-56) BSW     British Standard Whitworth, small; 55°; W1.984x0.454
@   5/64-56           Sellers
    5/64-56           old military screws, NAS1102-02-8, 3/8" thread, 1/2" total length
====M2x0.2            S2x0.2; DIN fine, DIN 13-2
    M2x0.2            some miniature leadscrews
====M2x0.25           S2x0.25; ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine SI M.MB, ISA B (1940), DIN 13-2, GOST 9150-59 constant, GOST 24705-81
    M2x0.25           on some pogo pin contacts, on miniature piezo pressure sensors
====M2x0.3            SI??
====M2x0.35           DIN 13-2
H   2.00x0.39         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
*   M2x0.4 STI        ...see 2.520x0.4 (screw thread insert)
H   2x0.400           Progress thread, size 20, historical; fine (Guide to World Screw Thread)
H   2x0.4             watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh2x0.4           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
H   079               2.00x0.40, 60°, derived from NHS 56100; CUES Ottawa 1945 proposal, preferred size
==  M2(x0.4)          M2, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, German horological metric, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, DIN coarse, DIN 13-1, SI M.MA plus France except Japan, "French Metric" (as of ISA 1940), French horological 60°, ISA A (1940), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, NHS 56100 (60°) (from 1923), GOST 9150-59 coarse, GOST 24705-81
    2.00x0.400        no.25 Bergeon tap, watchmaking/horological, drill 1.68mm; Horotec taps, Bergeon 2659 dies; common
!   M2x0.4            in cellphones (larger screw) and general electronics (smaller screw, also M2.5 and M3)
    M2                on body jewellery/piercing, internal thread on some 10ga(AWG)/2.4mm and larger; not too common
    M2                dental implants, internal thread; most common standard larger size (also M1.6); see also M1.4, M1.6, M1.8, 1-72, M2.5
 t  M2                on some dial indicators; stem/tip/contact point attachment; also #4-48, M2.5, M1.6, M1.4
 t  M2                small rotary tools, Dremel-style mandrels for wheel center hole 1/16" or 1.8mm; see also M1.7, M2.5
    M2x0.4            screws for carbide inserts, also M2x0.45, M2.2x0.45, M2.5x0.45
    M2                electrical terminal blocks, pitch 7mm (each other in 3.5mm, 10A/6A), 3.5mm, 3.81mm/0.15" (13.5A/10A)
    M2x0.4            on bottom of GoPro Hero8 camera, to attach tripod plate
    M2x0.4            on feathering shafts of B400 and Trex model helicopters
T   M2.0x0.40         in Wiru No.1 tap/die set, watchmaking
T   M2x0.4            present in GEKO G38300 thread cutting set
H   2.00x0.45         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915, superseded
H   M2x0.45           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; coarser pitch than M2x0.4 ISO coarse
====M2x0.45           "series D" (TM 9-254, 1958)
    M2x0.45           on some panel-mount slide switches
    M2x0.45           on some small geared motors
    M2x0.45           screws for carbide inserts, less common than M2x0.4
    M2x0.45           in some Zebra printers
    M2x0.45           music instruments, Yamaha saxophones, small hinge rod screws (also M2.3x0.45) (can be M2x0.4?)
s   2x0.45            self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
H   2x0.571           Progress thread, size 20, historical
M   HA 2              2x0.6, medical implants, bone screws, shallow thread; cortical bone screw, metacarpal, large phalangeal; asym thread 35/3° rounded, minor dia 1.3mm, drill 1.5mm; DIN 58810, ISO 5835:1991
s   M2x0.6            self-tapping screws type B, type AB, type 25
s   2-40              2x0.64; self-tapping screws type B
s   2x0.65            self-tapping screws, Uni-Mag, for magnesium alloys
s   M2x0.79           self-tapping screws type 0, type 2
s   2-32              2x0.79; self-tapping screws type A; type P
s   MG2x0.80          thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
s   M2x0.89           thread-rolling screws, EJOT PT style, for thermoplastics, 30°
W   2x0.9             wood screws, DIN
s   2x1               self-tapping screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   2x1.05            thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
=====14 SWG           British Standard Wire Gauge, 0.080", 2.032mm
H   2.029x0.352       Latard thread no.0, on Martin Fils/Perrelet et Martin 'L' thread plates; Swiss, watchmaking, historical
H   0.080-62 CEI      2.03x0.410; Original Cycle, British bicycles, 60°, historical; matches 14-swg gauge wire
@   14 IWG            0.080-62, 2.032x0.41, Imperial Wire Gauge, for bicycle/motorcycle wheel spokes/nipples
@   0.08-60           Whitworth Instrument, 47.5°, size 80, 2.032x0.423
H   0.080-56          coarser variant of 0.080-62; on antique British bicycles, on wheel spokes; maybe 14E 56?
=====12 AWG           American Wire Gauge, Brown&Sharpe, 0.0808", 2.053mm; copper conductors, 3.31mm2, 5.211mΩ/m, 20..30 amps (60/90°C)
@   #1.1/2-56         American Screw Company (0.081-56, Machinists Handbook 1909)
@   BC 1.8(-56)       BC1.8, 2.06x0.454, bicycle thread, spoke use, spoke #15 (rolled on 15ga wire, 1.82mm), light vehicles; JIS B 0225
=====14 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.083", 2.108mm; injection needle, inner dia 1.60mm, pale green
@   0.0825-56 BSC     British Standard Cycle, bicycles, 60°; less common size?; matches 14ga wire (2.0mm); spokes and nipples, spoke size 15 (rolled thread)
@   Fg2(-56)          2.096x0.454, bicycle screw thread, 60°, DIN 79012
!   FG2               common on 1.8mm/15g bicycle wheel spokes, usually rolled (not cut); DT Swiss, Sapim, Wheelsmith (also FG2.3 for 14g); racing bikes
T   14E 56            0.083-56, 2.11x0.454, in antique bicycle thread tap/die set, wheel spoke, #14 gauge wire
 o  M2.1x0.15         lens mount, for medical endoscopes, eg. OV6920/OV6922, 1/18" sensors
H   2.10x0.39         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
W   2.1x1.0           wood screws, M/M
H   2.16x0.4980       Mechaniker thread no.31, 51 tpi, 68° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
H   2.169x0.388       Bourgeaux thread no.0, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
H   2.18x0.430        FS 8, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 8, 0.0858-59.1
@   0.085-60          Whitworth Instrument, 47.5°, size 85, 2.159x0.423
=====#2 screw         wood/machine screw gage; 0.08416" 2.1377mm (American Screw Co. old standard) or 0.086" 2.184mm (ASME)
@   #2-80
    2-80              on some model engines; needle valves on regular Product/Sure Start
@   2-72
*   #2-64 STI         ...see 0.1063-64, 2.7x0.397 (screw thread insert)
=== #2(-64) UNF       0.086-64, M2.184x0.397, "086 fine", primary size, screw "Z" (US), ASME standard (1907, Machinists Handbook 1909), SAE regular, American Screw Co., UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    2-64              machine screw, listed in 1905 edition of Brook's Automobile Handbook
    2-64              musical instruments, Selmer Oboe Pivot Screw
 w  2-64              on firearms, in Brownells screw kits
*   #2-56 STI         ...see 0.1092-56, 2.77x0.454 (screw thread insert)
=== #2(-56) UNC       0.086-56, M2.184x0.454, "086 coarse", primary size, ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC (H28 1963), "series A" (TM 9-254, 1958), Sellers, JIS B 0210, aeronautical (H28 1944), BS 1580:1962, American Screw Company (0.089-56, Machinists Handbook 1909)
 o  #2-56             mounting holes on Thorlabs miniature translation stages
    2-56              common in smaller US electronics
    2-56              on some jewelry
    #2-56             on body jewellery/piercing, internal thread on 6-gauge(AWG) and thicker, imperial version (see also M1.2, M1.6); also 4-40, 8-32
    2-56              model trains; common on HO scale steam locomotives by Mantua, Roundhouse, and other; used to attach trucks on Athearn and other cars
    2-56              musical instruments, Selmer Flute Adjustment Screw
 C  2-56              securing screws on connectors, SCSI-3
    2.2-56            on bicycles; common 2mm (14g) spoke threading
 w  2-56              on firearms, in Brownells screw kits
    2-56              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..1/2")
s   2-56              self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   2-56              thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
====2-48              M2.184x0.529, American Screw Co.
s   #2-32             self-tapping screws type B, type AB, type 25; 2.2x0.8; coarse, sharp; ANSI B18.6.4
s   2-32              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   2-28              self-tapping screws type PLAST 48/2, for plastic; 48-deg, double-start, sharp thin threads, trilobular
s   2-28              2x0.91; thread-rolling screws, Plas-Fix, for plastic, 60° thread
s   2-28              self-tapping screws type P482, for plastic
s   2-28              thread-forming screws, Plastite, for plastics
s   2-28              thread-rolling screws, Plastite style, 48deg 2-lead
W   2-28x2            wood screw type II #2, double-thread, FF-S-111D 1974
W   2-26              wood screw #2, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1
*   2.2               ...see #2    - rounding error
@   M2.2x0.2          DIN 13-2
=== M2.2x0.25         ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd fine, DIN 13-2, GOST 9150-59 constant, GOST 24705-81
====M2.2x0.35         DIN 13-2
@   M2.2x0.4
H   2.20x0.42         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
====8BA               BA 8, 2.20x0.43, 47.5°, British Association standard BS 93-1951, screw "Z" (UK); alternative is M2.2
    8BA               British endoscope lamp housing, type B; 0.171" long thread
    8BA               wire retaining screws; bayonet lamp caps, B.15 type, 2-amp
    8BA               on Hornby model railways, body screws
=== M2.2(x0.45)       M2.2; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, BS 3643-1:1981 2nd coarse, SI M.MA France-only, "French Metric" (as of ISA 1940), French horological 60°, JIS B 0209, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81
    2.2x0.45          watchmaking; Horotec/Bergeon taps, Bergeon 2659 dies
    M2.2              screw for small carbide inserts, 6mm long (also M2.5, M2x0.4, M2x0.45)
s   2.2x0.5           self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
s   2.2x0.7           self-tapping screws, Uni-Mag, for magnesium alloys
s   M2.2x0.79         self-tapping screws, DIN 7970
=== ST2.2(x0.8)       self-tapping ISO #2; ISO 1478, EN 21478, DIN 7970; 60°
s   M2.2x0.8          self-tapping screws type B, type AB, type 25, metric variant of #2-32
s   2.2x0.9           thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   2.2x0.98          thread-forming screws, Plas-Tech 30, for plastic, 30° thread
s   M2.2x0.98         thread-rolling screws, EJOT PT style, for thermoplastics, 30°
s   M2.2x1.0          thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
=====4mm2 wire        2.26mm dia, electrical wire, IEC 60228 standard size
H   0.089-60          2.26x0.423, watch button thread, historical, size 0
s   M2.26x0.91        thread-forming screws, Plastite, for plastics
H   0.0892-80L        Elgin watch screw thread, historical, 2.266x0.318, LH/left (Guide to World Screw Threads)
@   BC 2(-56)         BC2, 2.27x0.454, bicycle thread, spoke use, spoke #14 (rolled on 14g wire, 2.03mm), utility vehicles; JIS B 0225
H   2.28-60           watch crown thread, size 18.0, historical, 2.28x0.423
@   0.09-60           Whitworth Instrument, 47.5°, size 90, 2.286x0.423
@   0.09-50           Whitworth Instrument, 47.5°, size 95, 2.286x0.508
====M2.3x0.25         SI M.MB, ISA B (1940), DIN fine
====M2.3x0.35         fine
H   Lh2.3x0.4         Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
=== M2.3x0.4          ISO extended, DIN coarse, SI M.MA plus Japan except France, ISA A (1940); deleted from JIS B 0209 in 1969
    M2.3x0.4          instrument lock screws
    M2.3              on some model servos
    M2.3              some Makita power tools
T   M2.3x0.40         in Wiru No.1 tap/die set, watchmaking
H   2.30x0.42         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
H   2.3x0.43          watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
====M2.3x0.45
    2.3x0.45          watchmaking; Horotec taps; uncommon
    M2.3x0.45         music instruments, Yamaha saxophones, small hinge rod screws (also M2x0.45) (can be x0.4?)
@   0.0905-56 BSC     British Standard Cycle, bicycles, 60°; less common size?, matches 2mm/14g wires; spokes and nipples, spoke size 14 (rolled thread)
@   Fg2.3(-56)        2.299x0.454, bicycle screw thread, 60°, DIN 79012
!   FG2.3             most common, on usual 2mm/14g bicycle wheel spokes, usually rolled (not cut); most European bicycles, Shimano; DT Swiss, Sapim, Wheelsmith (also FG2 for 15g); "default"
s   2.3-32            2.3x0.79; self-tapping screws type A; type B
s   2.3-28            2.3x0.91; self-tapping screws type P
=====11 AWG           American Wire Gauge, Brown&Sharpe, 0.0907", 2.305mm; copper conductors, 4.17mm2, 4.132mΩ/m
=====13 SWG           British Standard Wire Gauge, 0.092", 2.337mm
H   0.092-56 CEI      2.34x0.454, Original Cycle, British bicycles, 60°, historical; matches 13-swg gauge wire; on wheel spokes; maybe 13E 56?
@   13 IWG            0.092-56, 2.337x0.41, Imperial Wire Gauge, for bicycle/motorcycle wheel spokes/nipples
H   2.363x0.420       Bourgeaux thread no.00, on Martin Fils/Perrelet et Martin 'B' thread plates; Swiss, watchmaking, historical
=====13 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 3/32", 0.09375", 2.38125mm
@   3/32SM100         German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M2.38x0.254
    3/32-100          sewing machines, Singer tap TE521
    3/32-80           sewing machines, Singer tap TW20004
@   3/32-64
    3/32-64           sewing machines, Singer tap TE554
@   3/32-60 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   3/32-60           Sellers
@   3/32SM56          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M2.38x0.453
    3/32-56           sewing machines, Singer tap TE517, rough alternative #3-56 UNF; on some industrial Juki MO
@   3/32-56
@   3/32-50
    3/32-50           in 9th Ed. Machinery's Handbook, in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), USS?
    3/32-50           on some sewing machines
@   3/32-48 BSW       British Standard Whitworth, small; 55°; W2.38x0.529; old standard
@   3/32-48           "series C" (TM 9-254, 1958), Sellers
    3/32-48           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    3/32-48           sewing machines, Singer tap TW20011
@   3/32-40
@   3/32-36
@   3/32-32
s   3/32-32           self-tapping screws, W.T. type A, BS 1580:1962
H   2.40x0.45         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
    2.4x0.45          watchmaking; Horotec taps; rare
W   2.4x1             wood screws, DIN
W   2.4x1.1           wood screws, M/M
M   HA 2.4            2.4x?, medical implants, bone screws, shallow thread, unusual dia; cortical bone screw; minor dia 1.7mm, drill 1.8mm asym thread 35/3° rounded
H   2.48x0.478        FS 7, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 7, 0.0976-53.1
=====13 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.095", 2.413mm; injection needle, inner dia 1.80mm, purple
T   13E 56            0.095-56, 2.41x0.454, in antique bicycle thread tap/die set, wheel spoke, #13 gauge wire
T   13E 46            0.095-46, 2.41x0.552, in antique bicycle thread tap/die set, wheel spoke, #13 gauge wire
@   M2.5x0.2          DIN 13-2
    M2.5x0.2          adjustment screws
    2.50x0.20         taps for screw-in pushers, watch case pushers, watchmaking
@   M2.5x0.25         DIN 13-2
    M2.5x0.25         Rolex watches, 5.3mm dia case tubes (also M3x0.35); popular Rolex Oyster case size
    2.50x0.25         taps for screw pushers, watchmaking; Horotec taps
=== M2.5x0.35         ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, GOST 9150-59 constant, GOST 24705-81
*   M2.5x0.45 STI     ...see 3.084x0.45 (screw thread insert)
H   2.50x0.45         watchmakers' and small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915; Serie de la Societe d'Encouragement
==  M2.5(x0.45)       M2.5, common; "1st choice"; ISO 261 1st, ISO primary coarse (DIN is M2.6), ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, "French", French horological 60°, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81
!   M2.5x0.45         in cellphones (larger size) and small electronics (smaller screws, also M2 and M3); very common in laptops
    M2.5x0.45         common smaller alternative to M3, board and panel mounts in electronics
    2.5x0.45          watchmaking; Horotec taps
M   M2.5              dental implants, internal thread; in large implants, less common than M2; see also M1.4, M1.6, M1.8, 1-72, M2
    M2.5              on interchangeable jewellery findings; "M2.5 system", "Beach Buggy", "Sunset blvd", "M25 Interchangeable"; common with lampwork beads; also M1.1
 t  M2.5x0.45         on some dial indicators, eg. Mitutoyo; common; stem/tip/contact point attachment; also #4-48, M2, M1.6, M1.4, M4
    M2.5x0.45         some bushing EMC filters
    M2.5x0.45         microwave tuning screws
    M2.5              terminal screw on some male banana plugs
    M2.5              electrical terminal blocks, pitch 5mm (15..130A), 5.08mm/0.2" (8A)
    M2.5              screw for small carbide inserts, 6 or 8mm long (also M2.2, M2x0.4, M2x0.45)
    M2.5x0.45         music instruments, Yamaha saxophones, stacks and low Eb/C rods
@   7BA               BA 7, 2.50x0.48, 47.5°, British Association standard BS 93-1951; threads well to 3/32" (2.38mm) rod; alternative is M2.5; rare; odd gauge, not recommended for general use
    7BA               ceiling roses, BS.67; feed wire retainers, pillar-type terminals
    7BA               electrical pillar terminal clamp screw, BS.546 3-pin plugs, 2-amp
====M2.5x0.5
H   M2.5x0.55         US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; coarser than ISO coarse M2.5x0.45
s   2.5x0.6           self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
s   2.5x0.8           self-tapping screws, Uni-Mag, for magnesium alloys
s   MG2.5x0.90        thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
s   M2.5x0.9          self-tapping screws type B, type AB, type 25
s   2.5-28            2.5x0.91; self-tapping screws type A; type B
s   M2.5x1.06         self-tapping screws type 0, type 2
s   2.5x1.06          thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   2.5x1.12          thread-forming screws, Plas-Tech 30, for plastic, 30° thread
s   M2.5x1.12         thread-rolling screws, EJOT PT style, for thermoplastics, 30°
s   2.5x1.15          thread-forming screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   2.5x1.15          thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
s   M2.5x1.4          thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
s   2.5x1.4           thread-forming screws, Plastite 45, for plastic; 45° thread
=====#3 screw         wood/machine screw gage; 0.09732" 2.4719mm (American Screw Co. old standard) or 0.099" 2.515mm (ASME)
@   3-80
@   3-72
@   3-64
*   #3-56 STI         ...see 0.1222-56, 3.1x0.454 (screw thread insert)
=== #3(-56) UNF       0.099-56, M2.515x0.454, "099 fine", secondary size, ASME standard (1907, Machinists Handbook 1909), American Screw Co., SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF 2nd (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
 w  3-56              on firearms, in Brownells screw kits; Winchester 1890 1906 62/62A firing pin stop screw
 t  3-52              on some Starrett tools (adjustable parallels)
*   #3-48 STI         ...see 0.1261-48, 3.2x0.529 (screw thread insert)
=== #3(-48) UNC       0.099-48, M2.515x0.529, "099 coarse", secondary size, ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC 2nd (H28 1963), "series A" (TM 9-254, 1958), Sellers, JIS B 0210, aeronautical (H28 1944), BS 1580:1962, American Screw Company (0.101-48, Machinists Handbook 1909)
    3-48              favorite of model airplane and model railroaders, similar to M2.5; used by eg. Atlas in their #56 switches
    3-48              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..5/8")
 w  3-48              on firearms, in Brownells screw kits
s   3-48              thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals, uncommon
@   3-40
@   #3-36             ASME special (secondary?)
@   #3-32             "32N"
s   3-28              self-tapping screws type B, type AB; unusual size; ANSI B18.6.4
s   3-28              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads; unusual size
W   3-26x2            wood screw type II #3, double-thread, FF-S-111D 1974
s   3-24              thread-rolling screws, Plastite style, 48deg 2-lead
W   3-24              wood screw #3, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1, less common size
@   2.520x0.4         STI-M2x0.4, screw thread insert thread, DIN 8140-2
@o  0.10-60 Whitw.    2.54x0.423; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
H   0.1-55.11         Holtzapffel & Co. (1856), historical; 2.54x0.461; tap/die "U", comb-screw tool no.12
@   0.1-50            Whitworth Instrument, 47.5°, size 100, 2.54x0.508
H   0.1-48            Whitworth thread proposal, 1857
@   BC 2.3(-56)       BC2.3, 2.57x0.454, bicycle thread, spoke use, spoke #13 (rolled on 13g wire, 2.33mm), utility vehicles; JIS B 0225
H   2.58-90           watch pendant thread, size 10/0, historical, 2.58x0.282
=====10 AWG           American Wire Gauge, Brown&Sharpe, 0.1019", 2.588mm; copper conductors, 5.26mm2, 3.277mΩ/m, 30..40 amps (60/90°C)
====M2.6x0.25         DIN fine
 o  M2.6x0.25         lens mount, for medical endoscopes, for OV6930/GC0339, 1/9" and 1/10" sensors
====M2.6x0.35         SI M.MB, ISA A (1940)
H   Lh2.6x0.45        Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German; Serie Loewenherz
=== M2.6x0.45         M2.6; ISO extended, DIN (ISO size is M2.5), SI M.MA plus Japan except France, ISA A (1940); deleted from JIS B 0209 in 1969
    2.6x0.45          watchmaking; Horotec taps
    M2.6              electrical terminal blocks, pitch 5mm, 5.08mm/0.2" (18A); less common than M2.5
T   M2.6x0.45         in Wiru No.1 tap/die set, watchmaking
H   2.6x0.48          watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
s   2.6x0.6           self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
=== ST2.6(x0.9)       self-tapping ISO #3; ISO 1478, EN 21478, DIN 7970; 60°
s   2.6-28            2.6x0.91; self-tapping screws type A; type B
s   2.6-24            2.6x1.06; self-tapping screws type P
@   0.1025-56 BSC     British Standard Cycle, bicycles, 60°; less common size?; matches 12g wire (2.60mm, 0.104"); spokes and nipples, spoke size 13 (rolled thread)
@   Fg2.6(-56)        2.604x0.454, bicycle screw thread, 60°, DIN 79012
    FG2.6             common on 2.3mm/13g bicycle wheel spokes (less common than 14g spokes), usually rolled (not cut); most Asian bicycles, most e-bikes, tandems; cargo bicycles
H   2.61x0.5027       Mechaniker thread no.30, 50.10/19 tpi, 58° (size-specific); Siemens-Halske, German, in use until 1925, historical
s   M2.63x1.06        thread-forming screws, Plastite, for plastics
=====12 SWG           British Standard Wire Gauge, 0.104", 2.642mm
    0.104-56 BSC      or CEI?, on antique British bicycles, on wheel spokes
H   0.104-44 CEI      2.64x0.577, Original Cycle, British bicycles, 60°, historical; matches 12-swg gauge wire
@   12 IWG            0.104-44, 2.642x0.41, Imperial Wire Gauge, for bicycle/motorcycle wheel spokes/nipples
@   0.1063-64         STI-#2-64, 2.7x0.397; screw thread insert thread, ASME B18.29.1
M   HA 2.7            2.7x1, medical implants, bone screws, shallow thread; cortical bone screw, metacarpal; asym thread 35/3° rounded, minor dia 1.9mm, drill 2mm; DIN 58810, ISO 5835:1991
W   2.7x1.2           wood screws, DIN
W   2.7x1.2           wood screws, M/M
=====12 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.109", 2.769mm; injection needle, inner dia 2.16mm, pale blue
T   12E 50            0.109-50, 2.77x0.508, in antique bicycle thread tap/die set, wheel spoke, #12 gauge wire
T   12E 46            0.109-46, 2.77x0.552, in antique bicycle thread tap/die set, wheel spoke, #12 gauge wire
T   12E 42            0.109-42, 2.77x0.605, in antique bicycle thread tap/die set, wheel spoke, #12 gauge wire
T   12E 40            0.109-40, 2.77x0.635, in antique bicycle thread tap/die set, wheel spoke, #12 gauge wire
T   12E 36            0.109-36, 2.77x0.706, in antique bicycle thread tap/die set, wheel spoke, #12 gauge wire
=====6mm2 wire        2.77mm dia, electrical wire, IEC 60228 standard size
@   0.1092-56         STI-#2-56, 2.77x0.454; screw thread insert thread, ASME B18.29.1
=====12 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 7/64", 0.109375", 2.778mm
 t  7/64-56           on some Starrett tools (124 inside micrometer extension handle)
@   7/64(-48)         British Standard Whitworth, small; 55°; W2.778x0.529
@   7/64-48
    7/64-48           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
 t  0.110-52          on some Starrett tools
*   2.8               ...see #4 - rounding error
    2.80x0.20         taps for screw-in pushers, watch case pushers, watchmaking
M   2.8x0.3/20'taper  on bone plates, screw head locking thread, 55° thread, 20° taper; tap thread cone 1.5 to 2.8 mm dia 3.9mm long, 13 teeth
====M2.8x.45
H   2.81x0.531        FS 6, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 6, 0.1106-47.8
====6BA               BA 6, 2.80x0.53, 47.5°, British Association standard BS 93-1951, screw "A" (UK)
    6BA               Meccano construction sets, UK, on some early electrical parts; standard screw is 5/32 BSW
    6BA               electrical pillar terminal clamp screw, BS.546 3-pin plugs, 5-amp
    6BA               wire retaining screws; BC adaptors, BS.52; bayonet lamp caps, B.22 type, 5-amp
T   6BA               in antique M&W "Taps and Dies for Wireless" set (6BA, 4BA, 2BA)
=====#4 screw         wood/machine screw gage; 0.11048" 2.8062mm (American Screw Co. old standard) or 0.112" 2.845mm (ASME)
@   4-80
    4-80              on some model engines; TS
@   4-72
@   4-64
@   4-60
@   4-56
*   #4-48 STI         ...see 0.1391-48, 3.53x0.529 (screw thread insert)
=== #4(-48) UNF       0.112-48, M2.845x0.529, "112 fine", primary size, UNF, ASME standard (1907, Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
 t  4-48              on some dial indicators, eg. Mitutoyo; stem/tip/contact point attachment; also M2.5x0.45
 w  4-48              on firearms, in Brownells screw kits
@   4-44
*   #4-40 STI         ...see 0.1445-40, 3.67x0.635 (screw thread insert)
==  #4(-40) UNC       0.112-40, M2.845x0.635, "112 coarse", primary size, UNC, screw "A" (US), ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC (H28 1963), "series A" (TM 9-254, 1958), Sellers, JIS B 0210, aeronautical (H28 1944), BS 1580:1962
i   4-40              agreed upon by US/UK/Canada in late 1940s for eg. instrument-to-panel attachment; sizes 4-40, 6-32, 8-32, 10-32, 10-24 (10-32 preferred over 10-24); loose-sheet addendum to 3rd printing of B1.1-1949 (Standardization, vol.22-23, Jan 1952)
 o  4-40              imperial alternative to M3, common on Thorlabs optical systems
!C  4# UNC            D-sub Canon trapezoid DB-x connector securing screws
    4-40 UNC          used to be special in history, now standard
    4-40 UNC          some bushing EMC filters
    4-40              on body jewellery/piercing, internal thread on 6-gauge(AWG) and thicker (4ga, 2ga), imperial version (see also M1.6, M2); also 2-56, 8-32
    4-40              electrical binding posts/terminal blocks, ~15..25A
    4-40              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..3/4")
 w  4-40              on firearms, in Brownells screw kits; on some Glock slides
s   4-40              self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   4-40              thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
====4-36 UNS          ASME special (secondary?), NS, American Screw Co., "series C" (TM 9-254, 1958), Sellers, SAE(?), American Screw Company (0.113-36, Machinists Handbook 1909); in old tap/die sets instead of 4-40, old ASME standard, not in American Standard; use 4-40 instead
    4-36              machine screw, listed in 1905 edition of Brook's Automobile Handbook
    4-36              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    4-36 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
    4-36              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..3/4")
    4-36              WW2-and-before era, common small screw
    4-36              on lamps; socket threads
    4-36              some nylon screws
    4-36              standard nameplate attachment on many US fire alarms
i   4-36              often listed in tables; still somewhat common?
T   4-36              in a 1930 BayState tap/die set, in 1948 Sears tap/die set as standard coarse
====4-32 NS           ASME, NS, American Screw Co., "series C" (TM 9-254, 1958), "32N"
    4-32              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..3/4")
    4-32              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    4-32 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
    4-32              WW2-and-before era, less common than 4-36
@   4-30
s   4-24              self-tapping screws type B, type AB, type 25; 2.9x1.1; coarse, sharp; ANSI B18.6.4
s   4-24              self-tapping screws type A; root dia 0.080in/2.03mm
s   4-24              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   4-24              Plasti-Fast self-tapping screws
s   4-24              self-drilling, Tek screws (BSD), SAE J78-1998, less common size
W   4-24x2            wood screw type II #4, double-thread, FF-S-111D 1974
W   4-22              wood screw #4, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1
    #4 wood           common cabinet/furniture screw
    #4 wood           model trains; Lionel O27 tubular track mounting, modern Lionel Fastrack
s   4-20              thread-rolling screws, Plastite style, 48deg 2-lead
s   4-20              self-tapping screws type PLAST 48/2, for plastic; 48-deg, double-start, sharp thin threads, trilobular
s   4-20              self-tapping screws type P482, for plastic
s   4-20              thread-forming screws, Plastite, for plastics
W   4-13              particle board screw, M3.5x2.10; see also 6-12, 8-9, 10-8
@   BC 2.6(-56)       BC2.6, 2.87x0.454, bicycle thread, spoke use, spoke #12 (rolled on 12g wire, 2.63mm), two-wheel carts for heavy load; JIS B 0225
H   2.80x0.5347       Mechaniker thread no.29, 47.1/2 tpi, 66° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
H   2.89x0.6684       Mechaniker thread no.28, 38 tpi, 68° (size-specific); Siemens-Halske, German, in use until 1925, historical
*   2.9               ...see #4    - rounding error
s   M2.9x1            self-tapping screws type B, type AB, type 25, metric variant of #4-24
s   M2.9x1.06         self-tapping screws, DIN 7970
=== ST2.9(x1.1)       self-tapping ISO #4; ISO 1478, EN 21478, DIN 7970; 60°; root dia 2.18mm
s   2.9x1.27          thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   2.9x1.4
=====9 AWG            American Wire Gauge, Brown&Sharpe, 0.1144", 2.906mm; copper conductors, 6.63mm2, 2.599mΩ/m
@   0.1145-56 BSC     British Standard Cycle, bicycles, 60°; less common size?; spokes and nipples, spoke size 12 (rolled thread)
=====11 SWG           British Standard Wire Gauge, 0.116", 2.946mm
H   0.116-44 CEI      2.94x0.577, Original Cycle, British bicycles, 60°, historical; matches 11-swg gauge wire
@   M3x0.2            DIN 13-2
    M3x0.2            adjustment screws
@   M3x0.25           DIN 13-2
 t  M3x0.25           adjustment and micrometer screws
@   M3x0.3
    M3x0.3            some odd locknuts? (aliexpress kit)
=== M3x0.35           ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, DIN fine, SI M.MB, ISA B (1940), DIN 13-2, GOST 9150-59 constant, GOST 24705-81
    M3x0.35           Rolex watches, 6mm dia case tubes (also M2.5x0.25); popular Rolex Oyster case size
    M3x0.35           some piezo pressure sensors, force sensor, proximity sensors; also M4x0.35, M5x0.5, M6x0.5
    M3x0.35           some cavity tuning elements, microwave coaxial tuning screws
*   M3x0.5 STI        ...see 3.650x0.5 (screw thread insert)
H   3x0.5             Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   3x0.5             watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh3x0.5           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   3x0.5             SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
==  M3(x0.5)          M3, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, DIN coarse, SI M.MA plus France except Japan, ISA A (1940), new JIS coarse, ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, "French metric" (Machinists Handbook 1909)
    M3                one of the most common sizes in electronics; also M2.5, sometimes M2
 %  M3x0.5            steel waterjet cleaner nozzles (2000 bar)
    M3                electrical binding posts, 15..130A; terminal blocks, pitches 10.16mm/0.4",10mm,9.53mm/0.375",8mm,7.62mm,7.5mm,6.35mm/0.25",5mm,5.08mm/0.2",4.5mm,3.85mm (8..30 amp)
    M3x0.5            threaded ferrite cores
    M3x0.5            some miniature leadscrews
    M3                small pneumatic tubing ports (also M5, 10-32, 1/16 NPT, 1/8 NPT, G1/8)
    M3x0.5            on bicycles; dropout adjustment screws, some derailleur hardware, accessory hardware
    M3                on bicycles; spokes/nipples, transport and BMX bikes; some 2.6mm/12g wheel spokes on bicycles and motorcycles
    M3                darts, female on tip, connects to metal barrel, "M3 Darts"; see also 2BA thread (more standard), 1/4-20
    M3                screw eyes, 7.5kg
T   M3.0x0.50         in Wiru No.1 tap/die set, watchmaking; present in GEKO G38300 thread cutting set
H   3.00x0.60         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
H   3.00x0.60         French metric aircraft threads, from US Bureau of Standards LC18 1923
====M3x0.6            3M0.6, "3 SI screw"; JIS, SI M.MA Japan-only, SI (1971); "French Metric" (as of ISA 1940), French automobile (Pas Normal), "series D" (TM 9-254, 1958); Japan changed to M3x0.5 in 1960s, deleted from JIS B 0209 in 1969
    M3x0.6            some old Japanese motorcycles; cross-groove screws often marked with center punch
    M3x0.6            some violin/viola/cello eyelet screws
    M3x0.6            Selmer saxophone pilot screws
    M3x0.6            somewhat similar to #5-40
T   M3x0.6            in "D4140" cutting set
H   3x0.625           Bodmer Thread, historical, 50°; for mechanical and optical instruments
    M3x0.70           some violin/viola/cello eyelet screws, very rare
    M3x0.7            in aluminium and soft materials?
s   3x0.7             self-tapping screws, Uni-Alloy, for aluminium and zinc alloys
    M3x0.7            some cars, eg. Ferrari 308/328 dash vents; self-tapping
@   M3x0.75           "ISO-other", "metric special"
    M3x0.75           some violin/viola/cello eyelet screws, very rare; Targa bass bridge screws
    M3x0.75           sometimes in soft metals, plastics
 w  M3x0.75           some rifle gas blocks
s   M3x0.8            self-tapping screws
s   3x0.8             self-tapping screws, IBI-ZAS; asymmetric 40° thread
s   MG3x1.00          thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
s   3x1               self-tapping screws, Uni-Mag, for magnesium alloys
s   3-24              3x1.06; self-tapping screws type A, type B
s   3x1.2             thread-forming screws, Polymate, for plastic, 40° twin thread
s   3x1.2             thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
s   3-20              3x1.27; self-tapping screws type P
s   3x1.34            thread-forming screws, Plas-Tech 30, for plastic, 30° thread
W   3x1.35            wood screws, DIN
s   M3x1.34           thread-rolling screws, EJOT PT style, for thermoplastics, 30°
s   3x1.35            threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   M3x1.5            thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
s   3x1.5             thread-forming screws, Plastite 45, for plastic; 45° thread
=====11 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.120", 3.048mm; injection needle, inner dia 2.39mm, green-yellow
@   .120-80 NS
H   0.12-55.11        Holtzapffel & Co. (1856), historical; 3.048x0.461; tap/die "T", comb-screw tool no.12
T   11E 44            0.120-44, 3.05x0.577, in antique bicycle thread tap/die set, wheel spoke, #11 gauge wire
T   11E 36            0.120-36, 3.05x0.706, in antique bicycle thread tap/die set, wheel spoke, #11 gauge wire
@   3.084x0.45        STI-M2.5x0.45, screw thread insert thread, DIN 8140-2
@   0.1222-56         STI-#3-56, 3.1x0.454; screw thread insert thread, ASME B18.29.1
W   3.1x1.3           wood screws, M/M
s   M3.12x1.27        thread-forming screws, Plastite, for plastics
H   M3.15x0.65        US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; not in ISO series, close to #5-40
=====11 USG           US standard gauge for sheet plate steel, 15 US Code sec.206, 1/8", 0.1250", 3.175mm
=====#5 screw         wood/machine screw gage; 0.12364" 3.1405mm (American Screw Co. old standard) or 0.125" 3.175mm (ASME)
*   1/8" copper       ...see 0.248-28, W6.3x0.907
*   1/8" BSP          ...see G1/8-28, W 3/8-28 W9.525x0.907
*   1/8" NPT          ...see 13/32-27, M10.28x0.941,
*   1/8 JIC           ...see 5/16-24; fittings/tubes, dash size -2, nominal inner dia 1/8"
@   5-80 NS           1/8-80
@   5-72
@   5-64 NS
    1/8-64            sewing machines, Singer tap TE515, rough alternative 5/16-64 UNF
@   1/8-60 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   1/8-60
====1/8-56 MTP        Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT; common but less than 1/4-40, 3/16-40, 5/16-27
@   5-56 NS
    1/8-50            sewing machines, Singer tap TE513
@   5-48 NS           1/8-48; Sellers
@   1/8SM44           German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M3.175x0.577
    1/8-44            sewing machines, Singer tap TE507, similar to #5-44 UNF; on some industrial Juki MO
=== #5(-44) UNF       0.125-44, M3.175x0.577, "125 fine", primary size, ASME standard (1907, Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
 C  5-44              coax connector, M-series, "M5"
 h  5-44              old photo cameras, remote shutter, wire release thread PH3.24 (mostly US cameras); see Dr3.4x0.5 and Dr3.5x0.5 for European shutters
 w  5-44              on firearms, in Brownells screw kits
*   #5-40 STI         ...see 0.1575-40, 4x0.635 (screw thread insert)
H   0.125-40          Whitworth thread proposal, 1857
@   1/8-40 ME         Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
@   1/8-40 TWC        Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1/8-40 BSW        British Standard Whitworth; small; W3.175x0.635; 55°; secondary size; BS 84-1956 (avoid if possible; should be BSF but it is so long BSW it sticks); 1/8W40 (former JIS B 0210)
    1/8 BSW           toys, set screws in vintage Merkur construction sets (Czech, pre-WW2)
H   1/8-40 CEI        3.175x0.635, Original Cycle, British bicycles, 60°, historical
@   1/8-40 BSC        British Standard Cycle, CEI, bicycles (less common size?); bolts and nuts, free wheels
@   1/8SM40           German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100) (or SM44?) (not in Guide to World Screw Threads)
    1/8-40            sewing machines, Singer tap TW20024, similar to #5-40 UNC
@   1/8-40 NS         identical to 5-40 UNC
i   1/8-40            used to be common in history, now replaced with virtually identical #5-40
=== #5(-40) UNC       1/8-40, 0.125-40, M3.175x0.635, "125 coarse", primary size, ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC (H28 1963), "series A" (TM 9-254, 1958) (#5), "series C" (TM 9-254, 1958) (1/8), USS, JIS B 0210, aeronautical (H28 1944), BS 1580:1962
i   5-40              similar to M3x0.6
    5-40              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..7/8")
    5-40              "1/8 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    5-40              "weird 3mm screw", on some RC model motors
    5-40              in some US electronics, unusual size
    5-40              on Weston HCCT (Hand Cranked Coil Test) meters
    5-40              screw for carbide inserts
 w  5-40              on firearms, in Brownells screw kits; common on pistol grip escutcheons, some scopes
s   5-40              self-tapping screws type F, type 23; ANSI B18.6.4
s   5-40              thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals, uncommon diameter
@   #5-36 NS          1/8-36, ASME special (secondary?), NS, American Screw Co., Sellers, American Screw Company (0.125-36, Machinists Handbook 1909)
    5-36              in 9th Ed. Machinery's Handbook, in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    5-36 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
    5-36              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..7/8")
@   1/8-32 ME         Model Engineer, Whitworth-based, 55°, est.1912; some model boiler fittings, rare (32 tpi on this diameter nonstandard?)
H   1/8-32            stove bolt series, "SB", manufacturer standard, USA (Machinists Handbook 1909)
@   5-32 NS           1/8-32, NS, American Screw Co., Sellers, "32UNR"
    1/8-32            in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    5-32              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..7/8")
    5-32              common in ancient times, on some vintage vehicle ratchets, stove bolts
@   5-30
*   1/8-28 copper     ...see 0.248-28, W6.3x0.907
*   1/8-28 BSP        ...see G1/8, W 3/8-28 W9.525x0.907
@   5-28
 %  1/8-28            tube coupling, JIS 300, 1/8 ("-2"), tapered, or 30-deg male flare on male
*   1/8-27 NPT        ...see 13/32-27, M10.28x0.941,
    1/8-27            some panel nuts
@   1/8(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
@   1/8-26 BSC        British Standard Cycle (less common size?) (not in Guide to World Screw Threads)
s   1/8-24            self-tapping screws, W.T. type A
W   5-22x2            wood screw type II #5, double-thread, FF-S-111D 1974
s   5-20              self-tapping screws type B, type AB, type 25; unusual size; ANSI B18.6.4
s   5-20              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   5-20              thread-rolling screws, Plastite style, 48deg 2-lead, uncommon diameter
W   5-20              wood screw #5, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1, less common size
H   3.19x0.590        FS 5, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 5, 0.1256-43.1
H   3.2-80            watch pendant thread, size 5/0, historical, 3.2x0.318
@   0.1261-48         STI-#3-48, 3.2x0.529; screw thread insert thread, ASME B18.29.1
====5BA               BA 5, 3.20x0.59, 47.5°, British Association standard BS 93-1951; threads well to 1/8" (3.175mm) rod; alternative is M3; odd gauge, not recommended for general use; nuts common on 1/8 rods
    5BA               traditional clamp screws in 13-amp British power cable plugs, BS.1363; also 3BA
    5BA               ceiling roses, BS.67; feed wire retainers, plate-type terminals
    5BA               on some old British vehicles
@   BC 2.9(-44)       BC2.9, 3.24x0.577, bicycle thread, spoke use, spoke #11 (rolled on 11g wire, 2.93mm), two-wheel carts for heavy load; JIS B 0225
=====10 SWG           British Standard Wire Gauge, 0.128", 3.251mm
H   0.128-44 CEI      3.25x0.577, Original Cycle, British bicycles, 60°, historical; matches 10-swg gauge wire
=====8 AWG            American Wire Gauge, Brown&Sharpe, 0.1285", 3.264mm; copper conductors, 8.37mm2, 2.061mΩ/m, 40..55 amps (60/90°C)
@   0.1291-44 BSC     3.279x0.577; British Standard Cycle, bicycles, 60°; less common size?; matches 10g wire (3.20mm, 0.124"); spokes and nipples, spoke size 11 (rolled thread)
    0.1291-44 BSC     10ga wheel spoke thread, old Honda bicycles
=== ST3.3(x1.3)       self-tapping ISO #5; ISO 1478, EN 21478, DIN 7970; 60°; unusual size
H   3.37x0.6684       Mechaniker thread no.27, 38 tpi, 68° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
====Dr3.4x0.5         old photo cameras, remote shutter, wire release thread DIN 19004 Form A (PH3.23, mostly European cameras), 28° tapered; see Dr3.5x0.5/M3.5x0.5 for form B, #5-44 for US standard
@   RLS 3.4x0.5x28deg equivalent to Dr3.4x0.5, camera release thread
=====10 BWG           Birmingham Wire Gauge, Stubbs Gauge, 0.134", 3.404mm; injection needle, inner dia 2.69mm, olive-brown
T   10E 42            0.134-42, 3.40x0.605, in antique bicycle thread tap/die set, wheel spoke, #10 gauge wire
H   0.135-55.11       Holtzapffel & Co. (1856), historical; 3.429x0.461; tap/die "S", comb-screw tool no.12
H   3.43x0.5941       Mechaniker thread no.26, 42.3/4 tpi, 55° (size-specific); Siemens-Halske, German, in use until 1925, historical
    0.137-70          British endoscope lamp housing, type A; 0.158" long thread
*   3.5               ...see #6    - rounding error
@   M3x0.2            DIN 13-2
@   M3x0.25           DIN 13-2
 o  M3.5x0.25         lens mount, medical endoscopes with 1/13" sensors, eg.  MT9V124(CSP)
=== M3.5x0.35         ISO 261 2nd, ISO secondary fine, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, JIS B 0211, DIN fine, SI M.MB, ISA B (1940), DIN 13-2, GOST 9150-59 constant, GOST 24705-81
    M3.5x0.35         nut on some clocks, minute hand fixation nut
@   Dr3.5x0.5         old photo cameras, remote shutter, wire release thread DIN 19004 Form B, M3.5x0.5, straight; see Dr3.4x0.5 for form A, #5-44 for US standard
====M3.5x0.5          DIN 13-3, DIN 519 (2st)
    M3.5x0.5          threaded ferrite cores, common
 t  M3.5x0.5          screws/clamp nuts on some metric micrometer heads mounting stems
H   3.5x0.6           watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh3.5x0.6         Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   3.50x0.60         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
=== M3.5(x0.6)        M3.5, common; "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, JIS B 0209, MJ, SI M.MA plus France except Japan, "French Metric" (as of ISA 1940, avoid size), French automobile (Pas Normal), ISA A (1940), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81
    M3.5              toys, Merkur construction sets (Czech); usually 6mm long slotted cheesehead; also M3,M4 for set screws; other systems use 5/32 BSW (Meccano), #7-32 (US Meccano), M4 (Marklin)
    M3.5              electrical terminals; common in European mains-power electrical equipment; switches, plugs, extension cords
    M3.5              electrical terminal blocks, pitch 8mm (30A), 7.62mm/0.3" (30A), 6.35mm/0.25" (30A)
    M3.5x0.6          male thread on instrument lock screw  knobs
 C  M3.5x0.6          metric screws on connectors, eg. GPIB IEEE-488 (#6 as much less common UTS variant), same use as #4 on D-sub
    M3.5x0.6          some bushing EMC filters
    M3.5x0.6          bike wheel spokes
H   3.5x0.625         Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   M3.5x0.75
    M3.5x0.75         threaded ferrite cores
    M3.5x0.75         bike wheel spokes
s   3.5x0.95          self-tapping screws, IBI-ZAS; asymmetric 40° thread
s   MG3.5x1.20        thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
M   HA 3.5            3.5x1.25, medical implants, bone screws, shallow thread; cortical bone screw, also cannulated; asym thread 35/3° rounded, minor dia 2.4mm, drill 2.5mm; DIN 58810, ISO 5835:1991
s   3.5-20            3.5x1.27; self-tapping screws type B
s   3.5x1.27          self-tapping screws, DIN 7970
=== ST3.5(x1.3)       self-tapping ISO #6; ISO 1478, EN 21478, DIN 7970; 60°; root dia 2.64mm
s   M3.5x1.3          self-tapping screws type B, type AB, type 25, metric variant of #6-20
s   3.5x1.34          thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   3.5x1.35          thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
s   3.5x1.4           thread-forming screws, Polymate, for plastic, 40° twin thread
W   3.5x1.4           wood screws, M/M
s   3.5-18            3.5x1.41; self-tapping screws type A; type P
s   ST3.5(x1.49)      self-tapping drywall screw for plasterboard, PL, 60°, root dia 2.18 mm, 25kg load
s   ST3.5(x1.49x2)    self-tapping drywall screw, twinfast thread, M3.5
s   3.5x1.55          threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   3.5x1.57          thread-forming screws, Plas-Tech 30, for plastic, 30° thread
s   M3.5x1.57         thread-rolling screws, EJOT PT style, for thermoplastics, 30°
W   3.5x1.6           wood screws, DIN
s   ST3.5(x1.60)      self-tapping drywall screw, selfdrilling, PLTR, 60°, root dia 2.80 mm, 20kg load
s   M3.5x1.65         thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
s   3.5x1.65          thread-forming screws, Plastite 45, for plastic; 45° thread
s   3.5x3.2           uncommon?
=====#6 screw         wood/machine screw gage; 0.13680" 3.4747mm (American Screw Co. old standard) or 0.138" 3.505mm (ASME)
    6-100             tiny fine adjustment screws, 3.51x0.254, common
    .139-100 UNS      in some cameras
@   6-80 NS
    6-80 NS           tiny adjustment screws, 3.51x0.3175, common
@   6-72
@   6-64 NS
    6-64              adjustment screws on some variable capacitors (Arco Type 30)
@   6-60
@   6-56 NS
====6-48 NS           M3.505x0.529
 w  6-48              common on many firearms, on scope mounts, sights; base screw; on Winchester rifle 1886 1892 173 1894 1895; in Master Gunsmith Screw Kit; also #8-40
*   #6-40 STI         ...see 0.1705-40, 4.33x0.635 (screw thread insert)
=== #6(-40) UNF       0.138-40, M3.505x0.635, "138 fine", primary size, ASME standard (1907, Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
 %  6-40 UNF          waterjet sapphire nozzle inserts (2800 bar)
 %  6-40 UNF          HPLC ports, common fittings for 1/32" o.d. tubes (also 10-32), microfluidics (also 1/4-28, 10-32)
 w  6-40              on many firearms, scope mounts (less common than 6-48?)?; in Master Gunsmith Screw Kit
@   6-36 NS           ASME special (secondary?), NS, American Screw Co., "series C" (TM 9-254, 1958), Sellers
    6-36              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    6-36 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
    6-36              some bass eyelet screws
*   #6-32 STI         ...see 0.1786-32, 4.54x0.794 (screw thread insert)
==  #6(-32) UNC       0.138-32, M3.505x0.794, "138 coarse", primary size, screw "B" (US), 32UN, ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC/UN (H28 1963), "series A" (TM 9-254, 1958), "32N", JIS B 0210, aeronautical (H28 1944), BS 1580:1962, American Screw Company (0.141-32, Machinists Handbook 1909)
i   6-32              agreed upon by US/UK/Canada in late 1940s for eg. instrument-to-panel attachment; sizes 4-40, 6-32, 8-32, 10-32, 10-24 (10-32 preferred over 10-24); loose-sheet addendum to 3rd printing of B1.1-1949 (Standardization, vol.22-23, Jan 1952)
    6-32              machine screw, listed in 1905 edition of Brook's Automobile Handbook
!!! #6 UNC            computer hard drives, power supplies, expansion cards, cases; Computer case screws
 %  6-32              some faucet seats
    6-32              "1/8 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    6-32 UNC          some bushing EMC filters
    6-32 NC           electrical feedthrough centerwires, igniter top contacts
    6-32              electrical binding posts/terminal blocks, ~15..30A
    6-32              on lamps; socket threads, switch plates
    6-32              toys, Erector set, USA, some set screws, usually 3/16" long; standard screw size used is #8-32
    6-32              model trains, common "O" size of body screws (Lionel)
    6-32              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..1")
s   6-32              self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   6-32              thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
@   6-30 NS           American Screw Co.
    6-30              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/16..1")
@   6-24 NS
s   6-20              self-tapping screws type B, type AB, type 25; 3.5x1.3; coarse, sharp; ANSI B18.6.4
s   6-20              Dril-Kwick self-drilling self-tapping screws; Plasti-Fast screws
s   6-20              self-drilling, Tek screws (BSD), SAE J78-1998
s   6-20              drywall screw, type 2, for gypsum board; most common diameter; root dia 0.102in/2.59mm
s   6-20              drywall screw, High-Low thread
W   6-20x2            wood screw type II #6, double-thread, FF-S-111D 1974
s   6-19              self-tapping screws type P482, for plastic
s   6-19              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   6-19              self-tapping screws type PLAST 48/2, for plastic; 48-deg, double-start, sharp thin threads, trilobular
s   6-19              thread-rolling screws, Plastite style, 48deg 2-lead
s   6-19              thread-forming screws, Plastite, for plastics
s   6-18              self-tapping screws type A; root dia 0.099in/2.51mm
s   6-18              drywall screw, type-S (gypsum board to cold-formed steel), fine thread; also trim head; most common diameter
W   6-18              wood screw #6, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1; root dia 0.118in/3.0mm
    #6 wood           model trains, Lionel O31 tubular track mounting
W   6-18x2            wood screw, hi-lo twin thread
s   6-15              drywall screw DS, fine thread, 15 tpi for fast drive
W   6-12              wood screw, coarse thread; see also 8-10, 10-8
W   6-12              particle board screw, M3x1.95; see also 4-13, 8-9, 10-8
W   6-10              deck screws, coarse thread; see also 8-8, 10-8; also pitches 8,9,10
s   6-9               drywall screw, type-W (gypsum board to wood), coarse thread
W   6-8               drywall and particle board screw, coarse thread; pitches 8,9,10; see also 7-8, 8-8, 10-8
W   6-7               deck screws
@   0.1391-48         STI-#4-48, 3.53x0.529; screw thread insert thread, ASME B18.29.1
=====10 USG           US stainless steel gauge, Standard Wire Gauge, 9/64", 0.14063", 3.572mm
    9/64-56           sewing machines, Singer tap TE495
@   9/64(-40) BSW     British Standard Whitworth, small; 55°; W3.57x0.635
@   BC 3.2(-40)       BC3.2, 3.57x0.635, bicycle thread, spoke use, spoke #10 (rolled on 10g wire, 3.23mm), two-wheel carts for heavy load; JIS B 0225
@   9/64SM40          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M3.57x0.635; similar to #6-40 UNF
    9/64-40           sewing machines, Singer tap TE503, alternative #6-40 UNF; on some industrial Juki MO
    9/64-40 LH        sewing machines, Singer tap TE492, alternative #6-40 UNF left
    9/64-40           Singer, presser foot clamp
@   9/64-40
    9/64-40           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), USS
@   9/64-36           Sellers
    9/64-36           sewing machines, Singer tap TW20042
@   9/64-32           Sellers
=====10mm2 wire       3.58mm dia, electrical wire, IEC 60228 standard size
@   0.1423-40 BSC     British Standard Cycle, bicycles, 60°; less common size?; matches 9g wire (3.60mm, 0.142"); spokes and nipples, spoke size 10 (rolled thread)
H   3.62x0.656        FS 4, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 4, 0.1425-38.7
====4BA               BA 4, 3.60x0.66, 47.5°, British Association standard BS 93-1951, screw "B" (UK); alternative is M3.5
    4BA               4mm banana jack female panel all-outside, 3.6mm dia
    4BA               electrical pillar terminal clamp screw, BS.546 3-pin plugs, 15-amp
    4BA               traditional in British power cable plugs, cover-retaining screw; also 5BA, 3BA
    4BA               musical instruments, Selmer Key Guard Screw
T   4BA               in antique M&W "Taps and Dies for Wireless" set (6BA, 4BA, 2BA)
T   4BA               assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
s   M3.63x1.34        thread-forming screws, Plastite, for plastics
@   3.650x0.5         STI-M3x0.5, screw thread insert thread, ASME B18.29.1, DIN 8140-2
=====9 SWG            British Standard Wire Gauge, 0.144", 3.658mm
H   0.144-44 CEI      3.66x0.635, Original Cycle, British bicycles, 60°, historical; matches 9-swg gauge wire
=====7 AWG            American Wire Gauge, Brown&Sharpe, 0.1443", 3.665mm; copper conductors, 10.5mm2, 1.634mΩ/m
@   0.1445-40         STI-#4-40, 3.67x0.635; screw thread insert thread, ASME B18.29.1
    3.75-72           British endoscope lamp housing, type C (external thread), lamp No.3; 2mm long thread
=====9 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.148", 3.759mm; injection needle, inner dia 3.00mm
T   9E 38             0.148-38, 3.76x0.668, in antique bicycle thread tap/die set, wheel spoke, #9 gauge wire
@   0.148-32          gas (brass pipe) thread, size 0.148", 3.759x0.794; "ornamental brass", "small ornament brass", also 0.196-32 (Machinery's Handbook, 5th ed)
W   3.8x1.6           wood screws, M/M
@o  0.15-60 Whitw.    3.81x0.423; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
H   0.15-55.11        Holtzapffel & Co. (1856), historical; 3.81x0.461; tap/die "R", comb-screw tool no.12
@o  0.15-48 Whitw.    3.81x0.529; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
H   0.150-32          Whitworth thread proposal, 1857
=====#7 screw         wood/machine screw gage; 0.14996" 3.8090mm (American Screw Co. old standard) or 0.151" 3.854mm (ASME)
@   7-80
@   7-72
@   7-64
@   7-56
@   7-48
@   #7-40             ASME
@   7-38
@   #7-36             ASME standard (1907, Machinists Handbook 1909), NS, Sellers, "UNRF", ASME
    7-36              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
====#7-32             ASME special, NS, American Screw Co., "32N", "UNRC", American Screw Company (0.154-32, Machinists Handbook 1909)
    #7-32             toys, Meccano construction sets, USA (after 1916-22); usually 1/4" (6mm) long slotted cheesehead; for UK and pre-1922 see 5/32 BSW; for others see M3.5, M4
    7-32              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/8")
@   #7-30             ASME special (secondary?), NS, American Screw Co., Sellers
    7-30              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    7-30              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/8")
@   7-28
s   7-19              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   7-19              self-drilling, Tek screws (BSD), NOT IN SAE J78-1998
s   7-19              self-tapping screws type B, type AB, type 25; ANSI B18.6.4
=== ST3.9(x1.3)       self-tapping ISO #7; ISO 1478 (diameter not in ISO?), EN 21478, DIN 7970; 60°; root dia 2.92mm; secondary size?
s   M3.9x1.3          self-tapping screws type B, type AB, type 25, metric
s   3.9x1.34          self-tapping screws, DIN 7970
s   3.9x1.41          thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   7-18              thread-rolling screws, Plastite style, 48deg 2-lead, rare
W   7-18x2            wood screw type II #7, double-thread, FF-S-111D 1974
W   7-16              wood screw #7, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1
s   7-16              drywall screws, type-S (gypsum board to cold-formed steel), fine thread
s   7-16              drywall screw, High-Low thread
s   7-16              self-tapping screws type A (uncommon size)
s   ST3.9(x1.59x2)    self-tapping drywall screw, twinfast thread, M3.9
s   7-15              drywall screw, type-S (gypsum board to cold-formed steel), fine thread, 15 tpi for faster drive
s   7-9               drywall screw, type-W (gypsum board to wood), coarse thread
W   7-8               drywall and particle board screw, coarse thread; pitches 8,9,10; see also 6-8, 8-8, 10-8
W   7-8               deck screws; also pitches 8,9,10
s   ST3.9(x1.69)      self-tapping drywall screw for plasterboard, PL, 60°, root dia 2.34 mm, 25kg load
s   ST3.9(x2.80)      self-tapping drywall screw with coarse thread, PLRA, 60°, root dia 2.80 mm
@   BC 3.5(-40)       BC3.5, 3.87x0.635, bicycle thread, spoke use, spoke #9 (rolled on 9g wire, 3.53mm), two-wheel carts for heavy load; JIS B 0225
M   3.9x0.35/20'taper on bone plates, screw head locking thread, 55° thread, 20° taper; tap thread cone 1.8 to 3.9 mm dia 6.3mm long, 18 teeth
H   3.9-66            watch pendant thread, size 0, historical, 3.9x0.385
s   3.9x3.2           uncommon?
H   0.154-40 CEI      3.91x0.635, Original Cycle, British bicycles, 60°, historical
=====9 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 5/32", 0.15625", 3.969mm
@   5/32-64
@   5/32-60 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   5/32-60
@   5/32-48 MTP       Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT, unusual size
@   5/32-48
@   5/32-40 ME        Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare; alternative is M4x0.5
@   5/32-40 NS        Sellers
    5/32-40           sewing machines, Singer tap TW20026, TW20028
    5/32-40           on some ancient lathes
@   5/32-36 NS        "series C" (TM 9-254, 1958), USS
    5/32-36           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
@   5/32-32 ME        Model Engineer, Whitworth-based, 55°, est.1912; some model boiler fittings, rare (32 tpi on this diameter nonstandard?)
====5/32-32 BSW       British Standard Whitworth, small; 55°; W3.97x0.79; 5/32W32 (former JIS B 0210); old standard; "Meccano thread"; similar to M4, do not confuse
    5/32 BSW          toys, Meccano construction sets, USA (to 1916-22, then #7-32) and UK; usually 1/4" (6mm) long slotted cheesehead; 5/32 bolt won't fit #7 nut; some parts 6BA; other systems use M4 (Marklin), M3.5 (Merkur)
    5/32 BSW          toys, Steel Tec construction sets
    5/32 BSW          common on older furniture, drawer pulls
    5/32 BSW          on some old English wire wheel spokes (CEI?)
H   5/32-32 CEI       3.97x0.794, Original Cycle, British bicycles, 60°, historical
@   5/32-32 BSC       British Standard Cycle, CEI, bicycles (less common size?); bolts and nuts, small screws
====5/32-32 UNS       M3.97x0.79, "series C" (TM 9-254, 1958), NS, Sellers
    5/32-32           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    5/32-32           sewing machines, Singer tap TE530
    5/32-32           stove bolts (interchangeable with #8-32), loose-fit tolerance, UNC-1A; American National standard
H   5/32-30           stove bolt series, "SB", manufacturer standard, USA; old standard (Machinists Handbook 1909)
 w  .156-30           old single-shot rifles for boys, forearm screw for Stevens 44, 44-1/2 and Favorite
H   5/32-28           stove bolt series, "SB", manufacturer standard, USA (more common than -30?)
@   5/32-28 stove     stove bolt, sizes from Strelinger catalog of 1895; new standard (Machinists Handbook 1909); 60° Sellers-like with wider root/crest flats (1/4-18 flats equal 11 tpi, as by Machinery's Encyclopedia for 1917)
@   5/32-28           Sellers
@   5/32(-26) BSB     British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; secondary size
@   5/32-26 BSC       British Standard Cycle (less common size?) (not in Guide to World Screw Threads)
s   5/32-16           self-tapping screws, W.T. type A
@   M4x0.2            DIN 13-2
@   M4x0.25           DIN 13-2
 o  M4x0.25           lens mount, for 1/8" 1/9" 1/10" sensors, uncommon
 t  M4x0.25           adjustment and micrometer screws
=== M4x0.35           DIN fine, DIN 13-2
 o  M4x0.35           lens mount, for 1/3.7" and 1/4" sensors, eg. for endoscopes; "M4"
 %  M4x0.35           some tubing systems
    M4x0.35           some piezo pressure sensors, force sensor, proximity sensors; also M3x0.35, M5x0.5, M6x0.5
 C  M4x0.35           on some small coaxial RF connectors
    M4x0.4            some odd locknuts? (aliexpress kit)
=== M4x0.5            ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-3, DIN 519 (1st?), GOST 9150-59 constant, GOST 24705-81
 g  M4x0.5            some gas burner nozzles, air nozzles, sapphire waterjet orifice inserts (2800 bar)
 %  M4x0.5            tubing, dental doctor's table side for hose nipples
    M4x0.5            lock screws, rare
    M4x0.5            standard dental curette insert thread
    M4x0.5            threaded ferrite cores, common
    M4                on some dial indicators, common large; stem/tip/contact point attachment; also #4-48, M2.5, M2, M1.6, M1.4,
@   0.1575-40         STI-#5-40, 4x0.635; screw thread insert thread, ASME B18.29.1
H   4.00x0.6684       Mechaniker thread no.25, 38 tpi, 61° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
*   M4x0.7 STI        ...see 4.910x0.7 (screw thread insert)
H   4x0.7             watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh4x0.7           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
==  M4(x0.7)          M4, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, DIN coarse, SI M.MA except France except Japan; new JIS coarse, ISA A (1940), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81
    M4                hex head wrench size: 7 (ANSI/ISO/DIN/JIS)
    M4x0.7            one of most common general purpose sizes
 %  M4x0.7            steel waterjet cleaner nozzles (2000 bar)
    M4x0.7            common on terminal of spark plugs and igniters, metric alternative to 8-32
    M4                electrical binding posts, 15..180A; terminal blocks, pitch 12.7mm/0.5" (65A) (also M4.5), 10.16mm/0.4" (60A)
    M4                semiconductor packaging, stud-mounted diodes; E6 case
    M4                low-cost car roof antennas, male on antenna; also M5, M6
    M4                screw for carbide inserts, 8mm long
    M4x0.7            on bicycles; some derailleur limit screws (DIN standard)
    M4                on bicycles; brake/gear adjustments, clamps
    M4x0.7            bike wheel spokes
    M4                architectural suspension systems, typ. for 3/64" 1.19mm, 1/16" 1.59mm, 3/32" 2.38mm cable (side exit)
    M4                straight hooks/screw eyes, 12.5kg; cup hooks, 9kg
    M4x0.7            common shaving razor head threads
    M4                fountain pens, euro pen finial (decorative fitting)
T   M4x0.7            present in GEKO G38300 thread cutting set
H   4x0.715           Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   4x0.75            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   4.00x0.75         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
H   4.00x0.75         French metric aircraft threads, from US Bureau of Standards LC18 1923
====M4x0.75           4M0.75, JIS, SI M.MA France-Japan-only, SI (1971); old Japanese JIS coarse, "French Metric" (as of ISA 1940), French automobile (Pas Normal), "French metric" (Machinists Handbook 1909), "series D" (TM 9-254, 1958); deleted from JIS B 0209 in 1969, Japan changed to M4x0.7 in 1960s
 g  M4x0.75           some gas burner nozzles (Silko, Nagema, Bosch Rexroth,...), some LPG, often old coal gas
    M4x0.75           some old Japanese motorcycles; cross-groove screws often marked with center punch
    M4x0.75           on bicycles; common derailleur limit screw (JIS standard)
    M4x0.75           musical instruments, Yanagisawa saxophone brace
T   M4x0.75           in "D4140" cutting set
H   M4x0.8            US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; coarser than ISO coarse M4x0.7
====M4x0.8
 g  M4x0.8            some gas burner nozzles (may be M4x0.7 with 0.8mm hole?)
 %  M4x0.8            spigots for gastro equipment (Barline, Gev, Scotsman, Simag)
    M4x0.8            some karts, rear OTC hubs
    M4x0.8            front fork air bleed valve cap screw, some Hondas
s   4x1.05            self-tapping screws, IBI-ZAS; asymmetric 40° thread
s   4-20              4x1.27; thread-rolling screws, Plas-Fix, for plastic, 60° thread
s   MG4x1.40          thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
s   4-18              4x1.41; self-tapping screws type B
M   HA 4              4x1.5, medical implants, bone screws, shallow thread; cortical bone screw; asym thread 35/3° rounded, minor dia 2.9mm, drill 2.9mm; DIN 58810, ISO 5835:1991; secondary size?
s   4x1.55            thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
s   4-16              4x1.59; self-tapping screws type A, type P
s   4x1.6             thread-forming screws, Polymate, for plastic, 40° twin thread
M   HB 4              4x1.75, medical implants, bone screws, deep thread; cancellous bone screw; asym thread 25/5° rounded, minor dia 1.9mm, drill 2.5mm(?); DIN 58810, ISO 5835:1991
s   4x1.75            threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   M4x1.75           thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
s   4x1.75            thread-forming screws, Plastite 45, for plastic; 45° thread
s   M4x1.79           thread-rolling screws, EJOT PT style, for thermoplastics, 30°
W   4x1.8             wood screws, DIN
@   0.1583-40 BSC     British Standard Cycle, bicycles, 60°; less common size?; matches 8g wire (4.00mm, 0.156"); spokes and nipples, spoke size 9 (rolled thread)
=====8 SWG            British Standard Wire Gauge, 0.160", 4.064mm; "number 8 wire"; jury-rigging wire in New Zealand, UK Commonwealth
H   0.160-40 CEI      4.06x0.635, Original Cycle, British bicycles, 60°, historical; matches 8-swg gauge wire
@   3BA               BA 3, 4.10x0.73, 47.5°, British Association standard BS 93-1951; alternative is M4; rare; odd gauge, not recommended for general use, unusual
    3BA               on some old British electrical equipment
    3BA               on older British vehicles; deceptively similar to #8-32, do not mistake
    3BA               traditional in 13-amp British power cable plugs, cover-retaining screw; also 5BA, 4BA
W   4.1x1.8           wood screws, M/M
=====6 AWG            American Wire Gauge, Brown&Sharpe, 0.1620", 4.115mm; copper conductors, 13.3mm2, 1.296mΩ/m, 55..75 amps (60/90°C)
H   4.11x0.729        FS 3, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 3, 0.1618-34.8
H   0.1625-39.83      Holtzapffel & Co. (1856), historical; 4.128x0.638; tap/die "Q", comb-screw tool no.11
=====#8 screw         wood/machine screw gage; 0.16312" 4.1432mm (American Screw Co. old standard) or 0.164" 4.166mm (ASME)
    8#-100            adjustment screws, common, 4.166x0.254
@   8-80 UNS
@   8-72
@   8-64
@   8-60
@   8-56 NS
@   8-48 UNS
 w  8-48              on some firearms, in Master Gunsmith Screw Kit
====8-40 UNS          ASME, NS, "series C" (TM 9-254, 1958), Sellers
    8-40              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    8-40 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
 h  8-40              on antique (ca. 1920) Hardinge Cataract lathes
 w  8-40              "gun screw", common on many firearms; on scope mounts, sights; base screw, ring screw; Winchester 1873 oversized barrel band screws; in Master Gunsmith Screw Kit, Brownells screw kits; also #6-48
*   #8-36 STI         ...see 0.2001-36, 5.08x0.706 (screw thread insert)
=== #8(-36) UNF       0.164-36, M4.166x0.706, "164 fine", primary size, ASME standard (1907, Machinists Handbook 1909), SAE regular, American Screw Co., UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF (H28 1963), "series B" (TM 9-254, 1958), Sellers, JIS B 0212, aeronautical (H28 1944), BS 1580:1962
 w  8-36              on firearms, in Brownells screw kits; Winchester rifle, Winchester 94 post 64 saddle ring
    8-36              some set screws
*   #8-32 STI         ...see 0.2046-32, 5.2x0.794 (screw thread insert)
==  #8(-32) UNC       0.164-32, M4.166x0.794, "164 coarse", primary size, screw "C" (US), 32UN, ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNF/UN (H28 1963), "series A" (TM 9-254, 1958), "32N", JIS B 0210, aeronautical (H28 1944), BS 1580:1962, American Screw Company (0.166-32, Machinists Handbook 1909)
i   8-32              agreed upon by US/UK/Canada in late 1940s for eg. instrument-to-panel attachment; sizes 4-40, 6-32, 8-32, 10-32, 10-24 (10-32 preferred over 10-24); loose-sheet addendum to 3rd printing of B1.1-1949 (Standardization, vol.22-23, Jan 1952)
    8-32              machine screw, listed in 1905 edition of Brook's Automobile Handbook
 %  8-32              some faucet seats
    8-32 UNC          some bushing EMC filters
    8-32 UNC          common on terminal of spark plugs, electrical feedthroughs, and igniters, alternative to M4
    8-32              optical bench and breadboard mounts, imperial smaller (see 1/4-20)
    8-32              on large body jewellery/piercing, internal thread on 0-gauge(AWG) and thicker (00ga, 11mm, 13mm), imperial version (see also M2, M3, M4); also 2-56, 4-40
    8-32              archery, arrow tips; male on tip/arrowhead, industry standard (all inserts except Easton Deep Six)
    #8-32             toys, Erector set, USA; usually 1/4" long slotted head; also some 6-32 set screws
    8-32              semiconductor packaging, stud-mounted diodes/SCRs; some TO-10 (also 10-32)
    8-32              electrical binding posts/terminal blocks, ~15A
    8-32              architectural suspension systems, typ. for 3/64" 1.19mm, 1/16" 1.59mm cable (side exit)
    8-32              on lamps; lanter assemblies holder screws, cross bars, canopy lock ups
    8-32              on furniture; drawer pulls
    8-32              "5/32 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    8-32              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/4")
    8-32              deceptively similar to 3BA on older British vehicles, do not mistake
 w  8-32              on firearms, in Brownells screw kits; also trigger stop screws
s   8-32              self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   8-32              thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
@   8-30              ASME special (secondary?), NS, American Screw Co., Sellers
    8-30              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    8-30 NS           in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
    8-30              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/4")
@   8-26
    8-26              music, on most vintage banjos, banjo hold down thread
====8-24 UNS          NS
s   8-20              drywall screw, type 2, for gypsum board
s   8-18              self-tapping screws type B, type AB, type 25; 4.2x1.4; coarse, sharp; ANSI B18.6.4
s   8-18              self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   8-18              Dril-Kwick self-drilling self-tapping screws; Plasti-Fast screws
s   8-18              self-drilling, Tek screws (BSD), SAE J78-1998
s   8-18              self-drilling, "type 4 buttonhead nonstructural screw", light steel framing screws
W   8-18x2            wood screw type II #8, double-thread, FF-S-111D 1974
s   8-16              self-tapping screws type PLAST 48/2, for plastic; 48-deg, double-start, sharp thin threads, trilobular
s   8-16              self-tapping screws type P482, for plastic
s   8-16              thread-rolling screws, Plastite style, 48deg 2-lead
s   8-16              thread-forming screws, Plastite, for plastics
W   8-16x2            wood screw, hi-lo twin thread
s   8-15              self-tapping screws type A; root dia 0.12in/3.05mm
s   8-15              drywall screw, type-S (gypsum board to cold-formed steel), fine thread; also trim head; DSSG, cement panels; K-Lath
s   8-15              drywall screw, High-Low thread
s   8-15              self-drilling screw, hi-lo thread
W   8-15              wood screw #8, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1; dowel screws
W   8-10              wood screw, coarse thread; see also 6-12, 10-8
W   8-9               particle board screw, M4x2.91; see also 4-13, 6-12, 10-8
s   8-8               drywall screw, type-W (gypsum board to wood), coarse thread
W   8-8               drywall and particle board screw, coarse thread; pitches 8,9,10; see also 6-8, 7-8, 10-8
W   8-8               deck screws, coarse thread; see also 6-10, 10-8
W   8-8               deck screws; also pitches 8,9,10
=====8 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.165", 4.191mm; injection needle, inner dia 3.43mm
T   8E 38             0.165-38, 4.19x0.668, in antique bicycle thread tap/die set, wheel spoke, #8 gauge wire
*   4.2               ...see #8    - rounding error
 o  M4.2x0.2          lens mount (1/7" sensors), cellphone cameras
 o  M4.2x0.25         lens mount (1/7" sensors), cellphone cameras, industrial endoscopes
=== ST4.2(x1.4)       self-tapping ISO #8; ISO 1478, EN 21478, DIN 7970; 60°; root dia 3.10mm
s   M4.2x1.4          self-tapping screws type B, type AB, type 25, metric variant of #8-18
====M4.2x1.41         as forming tap, also as +0.023mm oversized
s   4.2x1.41          self-tapping screws, DIN 7970
s   4.2x1.59          thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   ST4.2(x1.60)      self-tapping drywall screw with washer flathead, PLCA, 60°, root dia 2.60 mm, 25kg load
s   ST4.2(x1.69x2)    self-tapping drywall screw, twinfast thread, M4.2
s   ST4.2(x1.81)      self-tapping drywall screw for plasterboard, PL, 60°, root dia 2.50 mm, 25kg load
s   4.2x3.2           uncommon?
H   4.21x0.4127       Mechaniker thread no.23, 61.7/13 tpi, 60° (size-specific); Siemens-Halske, German, in use until 1925, historical
H   4.21x0.7968       Mechaniker thread no.24, 31.7/8 tpi, 63° (size-specific); Siemens-Halske, German, in use until 1925, historical
@   0.1705-40         STI-#6-40, 4.33x0.635; screw thread insert thread, ASME B18.29.1
=====8 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 11/64", 0.17188", 4.366mm
    11/64-64          sewing machines, Singer tap TE525
@   11/64SM40         German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M4.37x0.635
    11/64-40          sewing machines, Singer tap TE538; on some industrial Juki MO
@   11/64-36          Sellers
@   11/64(-32) BSW    British Standard Whitworth, small; 55°; W4.37x0.794
@   11/64-32
    11/64-32          in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), USS
    11/64-32          sewing machines, Singer tap TW20052
    11/64-32          on bicycles; partial attachment of gear level
H   4.4-66            watch pendant thread, size 12-6, historical, 4.4x0.385
H   0.175-32 CEI      Original Cycle, British bicycles, 60°, historical
@   BC 4(-32)         BC4, 4.45x0.794, bicycle thread, spoke use, spoke #8 (rolled on 8g wire, 4.03mm), two-wheel carts for heavy load; JIS B 0225
H   0.175-24          Whitworth thread proposal, 1857
=====7 SWG            British Standard Wire Gauge, 0.176", 4.470mm
H   0.1766-32 CEI     4.49x0.794, Original Cycle, British bicycles, 60°, historical; matches 7-swg gauge wire
=====#9 screw         wood/machine screw gage; 0.17628" 4.775mm (American Screw Co. old standard) or 0.177" 4.496mm (ASME)
@   9-32              ASME standard (1907, Machinists Handbook 1909), NS, American Screw Co., "32N", "UNRF"
    9-32              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    9-32              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.3/8")
@   9-30              ASME special (secondary?), NS, American Screw Co., Sellers, American Screw Company (0.180-30, Machinists Handbook 1909)
    9-30              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    9-30              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.3/8")
@   9-28
@   9-24              ASME special, NS, American Screw Co., Sellers, "UNRC"
    9-24              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    9-24              standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.3/8")
W   9-16x2            wood screw type II #9, double-thread, FF-S-111D 1974
W   9-14              wood screw #9, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1, unusual diameter
W   9-8               deck screws
W   9-8               drywall and particle board screw, coarse thread; pitches 8,9,10
@   M4.5x0.2          DIN 13-2
@   M4.5x0.25         DIN 13-2
@   M4.5x0.3
 o  M4.5x0.3          lens mount, endoscope lens, for SP0A19/GC0313/BF3903
@   M4.5x0.35         DIN 13-2
=== M4.5x0.5          ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd fine, JIS B 0211, DIN fine, SI M.MB, ISA B (1940), DIN 13-3, DIN 519 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M4.5x0.5          some pilot burner nozzles
 o  M4.5x0.5          optical systems, for M3x0.25 adjuster nut
    M4.5x0.5          fountain pens, LeGrand MontBlanc refill's threads
@   M4.5x0.7
 t  M4.5x0.7          some toolholder shim screws, UK machines?
H   4.5x0.715         Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   4.5x0.75          watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh4.5x0.75        Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   4.50x0.75         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
=== M4.5x0.75         M4.5; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, BS 3643-1:1981 2nd coarse, JIS B 0209, SI M.MA plus France except Japan, "French Metric" (as of ISA 1940, avoid size), French automobile (Pas Normal), ISA A (1940), DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81
    M4.5              electrical terminal blocks, pitch 12.7mm/0.5" (65A) (also M4)
    M4.5x0.75         surprisingly common in some European (particularly German) automobiles
    M4.5x0.75         bike wheel spokes
    M4.5x0.75         fountain pens, cross refill threads (plastic threads at top), inner cross transmission threads
s   4.5x1.7           thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
s   4.5x1.7           thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
M   HA 4.5            4.5x1.75, medical implants, bone screws, shallow thread; cortical bone screw; asym thread 35/3° rounded, minor dia 3mm, drill 3.2mm; DIN 58810, ISO 5835:1991
M   HB 4.5            4.5x?, medical implants, bone screws, deep thread, unusual dia; navicular bone screw, also cannulated; asym thread 25/5° rounded
s   4.5x2             threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
W   4.5x2             wood screws, M/M
W   4.5x2             wood screws, DIN
@   0.1776-32 BSC     British Standard Cycle, bicycles, 60°; less common size?; matches 7g wire (4.30mm, 0.171"); spokes and nipples, spoke size 8 (rolled thread)
@   0.1786-32         STI-#6-32, 4.54x0.794; screw thread insert thread, ASME B18.29.1
    4.55-60           British endoscope lamp housing, type C (external thread), lamp No.2; 2mm long thread
s   M4.55x1.59        thread-forming screws, Plastite, for plastics
=====7 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.180", 4.572mm; injection needle, inner dia 3.81mm
T   7E 38             0.180-38, 4.57x0.668, in antique bicycle thread tap/die set, wheel spoke, #7 gauge wire
H   0.18-36.10        Holtzapffel & Co. (1856), historical; 4.572x0.704; tap/die "P", comb-screw tool no.10, mandrel guide no.6
 o  M4.6x0.25         lens mount (1/5", 2.4mm, 3.8mm sensors, industrial endoscopes)
=====5 AWG            American Wire Gauge, Brown&Sharpe, 0.1819", 4.621mm; copper conductors, 16.8mm2, 1.028mΩ/m
H   4.67x0.5229       Mechaniker thread no.22, 48.4/7 tpi, 62° (size-specific); Siemens-Halske, German, in use until 1925, historical
H   4.66x0.810        FS 2, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 2, 0.1835-31.4
====2BA               BA 2, 4.70x0.81, 47.5°, British Association standard BS 93-1951, screw "C" (UK); threads well to 3/16" (4.76mm) rod; alternative is M5, #10-32; common
    2BA               deceptively similar set, almost-same: 3/16-32 BSF, 3/16-32 BSC, 10-32, 2BA, M5x0.8; tight fit with #10-32, may or may not work
    2BA               electrical binding posts, old imperial British Engineering Standards Association (BESA) conduit boxes in the UK
    2BA               electrical pillar terminal clamp screw, BS.546 3-pin plugs, 30-amp
    2BA               ceiling roses, BS.67, fixing screws
    2BA               darts, male on tip, "6mm", connects to metal barrel; most common in tournaments, slimmer barrel than 1/4, "6mm thread"; see also M3, 1/4-20
    2BA               common in old British cars
T   2BA               in antique M&W "Taps and Dies for Wireless" set (6BA, 4BA, 2BA)
T   2BA               basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
T   2BA               assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
*   3/16 JIC          ...see 3/8-24; fittings/tubes, dash size -3, nominal inner dia 3/16"
=====7 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 3/16", 0.1875", 4.7625mm
===== 3/16 Cu tube    4.76mm outer-diameter copper tube; AS/NZS 1571, wall thick 0.71mm (12.7 MPa)
    3/16-120          adjustment screws
    3/16-100          adjustment screws, common-ish
@   3/16-60 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   3/16-60
@   3/16-48
@   3/16-40 ME        Model Engineer, Whitworth-based, 55°, est.1912; standard series; (also 3/16-40 MTP, model tapered pipe, 3/16-40 UST)
====3/16-40 MTP       Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT; second most common diameter after 1/4-40 MPT; also 1/8-56 MPT
@   3/16-40 UST       Universal Straight and Taper; for model steam engines, variant of MTP with 0.005" larger pitch diameter, incompatible with MTP, compatible with straight UNS; by P.M. Research Inc.
 %  3/16-40           "model pipe thread", model boiler/steam engine fittings; check if ME, MTP, UST or UNS; also 1/4-40, 1/4-32; alternative is M5x0.5
@   3/16-40 NS
    3/16-40           sewing machines, Singer tap TW20031
    3/16-40           some model engines, common on Elmers Engines packing nuts
@   3/16-36           "series C" (TM 9-254, 1958), Sellers
    3/16-36           on some sewing machines
 w  3/16-36 NS        on Winchester rifles, eg. mounting screws for tang sights on Winchester rifles; see #10-24 NS for Sharps rifles
@   3/16-32 ME        Model Engineer, Whitworth-based, 55°, est.1912 (32 tpi on this diameter nonstandard?)
@   3/16-32 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   3/16-32 BSF       British Whitworth Fine-pitch; W4.762x0.794; 55°; BS 84-1956; secondary size, avoid if possible, consider using 2BA instead
    3/16-32 BSF       deceptively similar set, almost-same: 3/16-32 BSF, 3/16-32 BSC, 10-32, 2BA, M5x0.8
 %  3/16-32 BSF       grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
T   3/16-32 BSF       assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
H   3/16-32 CEI       4.77x0.794, Original Cycle, British bicycles, 60°, historical
@   3/16-32 BSC       British Standard Cycle, CEI, bicycles (less common size?); chain adjust
    3/16-32 BSC       deceptively similar set, almost-same: 3/16-32 BSF, 3/16-32 BSC, 10-32, 2BA, M5x0.8
@   3/16SM32          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M4.76x0.796
    3/16-32           sewing machines, Singer tap TE565, TW20054, alternative #10-32 UNF
====3/16-32 NS        (old, #10-32 UNF suggested as preferable, common in history), "series C" (TM 9-254, 1958), "NF", "UNF", "32N", USS (Machinists Handbook 1909)
 %  3/16-32           Swagelok fittings; series 100, 1/16" tubes; other sources say 3/16-20?
    3/16-32           in 9th Ed. Machinery's Handbook
@   3/16-30           Sellers
    3/16-30           sewing machines, Singer tap TW20090
@   3/16SM28          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M4.76x0.907
    3/16-28           sewing machines, Singer tap TE559, alternative #10-28 UNS
    3/16-28           on Juki German sewing machines, Ng, NN, DIN 5309
    W3/16-28          on bicycles; historical, mudguard struts, until about 1920; handlebar and steering damper, until about 1955
@   3/16-27           "27N"
@   3/16(-26) BSB     British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances, secondary size?
@   3/16-26 BSC       British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   3/16-26
 w  3/16-26           rifle screws, Springfield Armory 1861 and 1863 musket wiper threads; somewhat substitutable with #10-26
@   3/16-24 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====3/16-24 BSW       British Standard Whitworth, small; W4.762x1.058; 55°; 3/16W24 (former JIS B 0210); BS 84-1956; secondary size, avoid if possible (this not mentioned in BS 84-1956?)
 S  3/16-24 BSW       old Royal Photographic Society suggestion for small camera tripods (also 1/4-20 BSW, 3/8-16 BSW)
T   3/16-24 BSW       assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
 w  3/16-25           old single-shot rifles for boys, on later lever style Stevens Crackshot 26, on Little Scout; (can be #10-25? 3/16-24 with lousy tolerance?)
H   3/16-24           stove bolt series, "SB", manufacturer standard, USA
@   3/16-24 stove     stove bolt, sizes from Strelinger catalog of 1895; old and new standard (Machinists Handbook 1909); 60° Sellers-like with wider root/crest flats (1/4-18 flats equal 11 tpi, as by Machinery's Encyclopedia for 1917)
    3/16-24           stove bolt, standard size (3/16-24, 1/4-18, 5/16-18, 3/8-16), as of 1933 "Standards and specifications for metals and metal products", maybe different root/crest flats?
====3/16-24 NS        3/16-24 (4.76x1.06mm) (old, #10-24 UNC suggested as preferable, 3/16-24 loose but holds in 10-24 hole; common in history), "UNC", Sellers, V.St'd (Machinists Handbook 1909)
    3/16-24           "3/16 stove bolt" (interchangeable with #10-24), loose-fit tolerance, UNC-1A; American National standard
    3/16-24           old set screws
@   3/16-20 BSC       British Cycle Pitch, bicycles (not in Guide to World Screw Threads)
@   3/16-20           Sellers
@   3/16-20 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
s   3/16-12           self-tapping screws, W.T. type A
W   3/16-11           dowel screws
*   4.8               ...see #10   - rounding error
=== ST4.8(x1.6)       self-tapping ISO #10; ISO 1478, EN 21478, DIN 7970; 60°; root dia 3.58mm
====ST4.8(x1.6x2)     self-tapping, double-start thread, for aluminium
s   4.8x1.59          self-tapping screws, DIN 7970
s   M4.8x1.6          self-tapping screws type B, type AB, type 25, metric variant of #10-16
s   M4.8x1.6          bay pole screws, self-drilling, spiral notch
s   4.8x1.81          thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
W   4.8x2.1           wood screws, M/M
s   ST4.8(x2.12x2)    self-tapping drywall screw, twinfast thread, M4.8
s   ST4.8(x2.30)      self-tapping drywall screw for plasterboard, PL, 60°, root dia 3.1 mm, 25kg load
s   ST4.8(x3.10)      self-tapping drywall screw with coarse thread, PLRA, 60°, root dia 3.5 mm
s   4.8x3.2           uncommon?
=====#10 screw        wood/machine screw gage; 0.18944" 4.8118mm (American Screw Co. old standard) or 0.190" 4.826mm (ASME)
@   10-80 NS
@   10-72
@   10-64 UNS
@   10-60
@   10-56 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D, Sellers
@   10-50 NS
@   10-48 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
====10-40 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
 t  10-40             tools, on Browne and Sharp dividing head
 w  10-40             firearms, Remington Rolling Block tang sights, Leupold Marlin 336R sights
H   0.19-39.83        Holtzapffel & Co. (1856), historical; 4.826x0.638; tap/die "O", comb-screw tool no.11 (other source says size "P"?)
====10-36 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  10-36 UNS-2A      coupling thread on SSMA connectors (up to 36 GHz), matches thinner coax than SMA, originally for semirigid 0.085" cable; see 1/4-36 for SMA
 w  10-36             on rifles, Winchester tang screw for 1890 1906 62/62A
 h  10-36             on antique (ca. 1920) Hardinge Cataract lathes
*   #10-32 STI        ...see 0.2306-32, 5.86x0.794 (screw thread insert)
==  #10(-32) UNF      10-32, 0.190-32 UNF, M4.826x0.79, "190 fine", primary size, screw "D" (US), 32UN, ASME standard (from when? 1907 one is -30), SAE regular, American Screw Co., UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF/UN (H28 1963), "series A" (TM 9-254, 1958), "32N", JIS B 0212, aeronautical (H28 1944), BS 1580:1962; almost 3/16-32 UNS
i   10-32             agreed upon by US/UK/Canada in late 1940s for eg. instrument-to-panel attachment; sizes 4-40, 6-32, 8-32, 10-32, 10-24 (10-32 preferred over 10-24); loose-sheet addendum to 3rd printing of B1.1-1949 (Standardization, vol.22-23, Jan 1952)
    10-32             machine screw, listed in 1905 edition of Brook's Automobile Handbook
    AN3               aircraft bolts, 10-32 UNF-3A; AN23, clevis bolt; AN73, drilled head; AN173, close tolerance; AN42, eye bolt (3/16 shank, 3/16 hole); NAS1103/NAS6203 shear bolts
 g  10-32 UNF         small pneumatic tubing ports (also M3, M5, 1/16 NPT, 1/8 NPT, G1/8)
 %  10-32 UNF         Swagelok/Bi-Lok fittings, 1/16" tubes
 %  10-32 UNF         HPLC ports, most common fittings for 1/16" and 1/32" o.d. tubes (also 6-40), microfluidics (also 1/4-28, 6-40)
 %  10-32 UNF         waterjet sapphire nozzle inserts (4200 bar)
 %  10-32             some faucet seats
 C  10-32 UNF         SMC coax connectors, 3/16" (4.76mm) dia
 C  10-32             coax connector, M-series, "M"; also L5 Microdot connector
!   10-32 UNF         rack mount screws, original historical size; common on audio equipment, radio/TV gear, Dell; see also 12-24 (more common in prethreaded racks now), M5, M6
 t  10-32             threaded shanks of aircraft drill bits, up to 3/8" (also 1/4-28, 3/8-24, 7/16-24)
    10-32             on lamps; lantern assemblies
    10-32 UNF-2A      semiconductor packaging, stud-mounted diodes/SCRs; typ. DO4, DO-203AA; metric is M5x0.8; TO-10, TO-59, TO-61, TO-83, TO-208AD, TO-94, TO-209AC
    10-32             electrical binding posts/terminal blocks, ~15..30A
    10-32             electrical contact, on ground bars
    10-32             adjustment screws, eg. needle valves in some carburetors (also 1/4-36)
    10-32             mounting studs on some high power diodes/thyristors (also M5x0.75)
    10-32             architectural suspension systems, typ. for 3/64" 1.19mm, 1/16" 1.59mm cable
    10-32             deceptively similar to 2BA, which is common on old British hardware
    10-32             deceptively similar set, almost-same: 3/16-32 BSF, 3/16-32 BSC, 10-32, 2BA, M5x0.8
    10-32             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/2")
    10-32             thread insert, external thread; EZ-Lok steel, 4-40
 w  10-32             on many firearms, in Master Gunsmith Screw Kit; rifle, Winchester 1890, 1906 62/62A forearm screw; rifle, peep sight apertures (also 7/32-40)
s   10-32             self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   10-32             thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
====10-30 NS          ASME (1907, Machinists Handbook 1909), NS, American Screw Co., "series C" (TM 9-254, 1958), Sellers
    10-30             in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    10-30 NS          in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
    10-30             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/2")
    10-30             on some ancient lathes
====10-28 UNS         ASME, NS, UNS (H28 1963); similar to 3/16SM28; UNS (H28 1963), ASME B1.1-2003 Appendix D, "28N"
    10-28             in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    10-28 NS          in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
 t  10-28 UNS         some toolholders/spindles? very rare
 t  10-28             tools, on Stanley duplex planes
 w  10-28             Pedersoli Sharps rifle tangs; Shiloh, C.Sharps, original Sharps rifles, Axtel Riflesmith sight; see 3/16-36 NS for Winchester
@   10-26
*   #10-24 STI        ...see 0.2441-24, 6.2x1.06 (screw thread insert)
==  #10(-24) UNC      0.190-24 UNC, M4.826x1.06, primary size, "190 coarse", ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC (H28 1963), "series A" (TM 9-254, 1958), Sellers, JIS B 0210, aeronautical (H28 1944), BS 1580:1962, American Screw Company (0.194-24, Machinists Handbook 1909)
i   10-24             agreed upon by US/UK/Canada in late 1940s for eg. instrument-to-panel attachment; sizes 4-40, 6-32, 8-32, 10-32, 10-24 (10-32 preferred over 10-24); loose-sheet addendum to 3rd printing of B1.1-1949 (Standardization, vol.22-23, Jan 1952)
 %  10-24             some faucet seats
    10-24 UNC-1A      "3/16 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    10-24             on lamps; lantern assemblies, common on hooksets
    10-24 NC          electrical feedthrough centerwires, less common than 8-32
    10-24             archery, typical mounting holes for sights on bows
    10-24             fountain pens, Woodcraft pen mandrel/arbor (headstock)
    10-24             low-cost car roof antennas, male on antenna; also converters to M6
    10-24             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 1/4..1.1/2")
s   10-24             self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   10-24             thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
s   10-24             self-drilling, Tek screws (CSD), SAE J78-1998
s   10-16             self-tapping screws type B, type AB, type 25; 4.8x1.6; coarse, sharp; ANSI B18.6.4
s   10-16             self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   10-16             Dril-Kwick self-drilling self-tapping screws; Plasti-Fast screws
s   10-16             self-drilling, light steel framing screws
s   10-16             self-drilling, Tek screws (BSD), SAE J78-1998
s   10-16             self-drilling, "type 3 truss connector", light steel framing screws
s   10-16             self-drilling, roofing screws
s   10-16             drywall screw, type 1, for fibre cement board
W   10-15x2           wood screw type II #10, double-thread, FF-S-111D 1974
s   10-14             self-tapping screws type PLAST 48/2, for plastic; 48-deg, double-start, sharp thin threads, trilobular
s   10-14             self-tapping screws type P482, for plastic
s   10-14             thread-rolling screws, Plastite style, 48deg 2-lead
s   10-14             thread-forming screws, Plastite, for plastics
s   10-14             self-drilling, "type 3 truss connector", light steel framing screws
s   10-14             drywall screw, type-S (gypsum board to cold-formed steel), fine thread
W   10-13             wood screw #10, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1
s   10-12             self-tapping screws type A; root dia 0.13in/3.30mm
s   10-12             drywall screws (SS)
W   10-11             lag screws
s   10-9              drywall/laminating screw, coarse type-G thread
W   10-8              drywall and particle board screw, coarse thread; pitches 8,9; see also 6-8, 7-8, 8-8
W   10-8              deck screws, coarse thread; see also 6-10, 8-8
W   10-8              wood screw, coarse thread; see also 6-12, 8-10
W   10-8              particle board screw, M5x3.10; see also 4-13, 6-12, 8-9
=====6 SWG            British Standard Wire Gauge, 0.192", 4.877mm
@   4.910x0.7         STI-M4x0.7, screw thread insert thread, DIN 8140-2
@   0.196-32          gas (brass pipe) thread, size 0.196", 4.978x0.794; "ornamental brass", "large ornament brass", also 0.148-32 (Machinery's Handbook, 5th ed)
@   M5x0.2            DIN 13-2
@   M5x0.25           DIN 13-2
@   M5x0.35           DIN 13-2
 o  M5x0.35           lens mount, "M5" (1/6", 1/5" sensors)
H   5-60              watch pendant thread, size 16, historical, 5x0.423
=== M5x0.5            ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, DIN fine, SI M.MB, ISA B (1940), DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M5x0.5            some tubing systems, e.g. in plastic industry; DN 2.7
 C  M5x0.5            on round connectors, "M5", business-end, internal; also M7x0.75 on external
    M5x0.5            bulkhead switch/button nut thread, spanner  7.0, tip-tip 8.0, th.1.2
    M5x0.5            on industrial proximity sensors, some pressure/force sensors; also M3x0.35, M4x0.35, M6x0.5
    M5x0.5            some bushing EMC filters
    M5x0.5            low-cost car roof antennas, male on antenna; also M5x0.8, converters to M6
    M5x0.5            some bearing lock nuts
    M5x0.5            in some car carburettors
    M5x0.5            some odd locknuts? (aliexpress kit)
 t  M5x0.5            on some carbide bit toolholder clamps
 w  M5x0.5            on Japanese WW2 rifles; Type 99 long front band (also M5.5x0.5, M6x0.75)
T   M5x0.5            present in N3-II thread cutting set
@   M5x0.6
 t  M5x0.6            some tooling collets
@   M5x0.7
 %  M5x0.7            some air fork bleeder valves
    M5x0.7            some center screws on bulkhead locks
 t  M5x0.7            on some carbide bit toolholder clamps
H   5x0.75            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   5x0.75            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   5.00x0.75         French metric aircraft threads, from US Bureau of Standards LC18 1923
=== M5x0.75           SI fine (1971), DIN 13-4, "ISO-other", French automobile (Pas Fin), "French metric" (Machinists Handbook 1909)
 %  M5x0.75           tubing, uncommon; compression fittings; on pneumatic systems
 %  M5x0.75           some lab tubing systems, uncommon; Luer adapters
 %  M5x0.75           some motorbike carburetor nozzles
    M5x0.75           low-cost car roof antennas, male on antenna; also M5x0.8, converters to M6
    M5x0.75           on some older Citroen cars, hard to find screws now
    M5x0.75           panel nut, on some 2mm plastic banana plug sockets, some small toggle switches
    M5x0.75           mounting studs on some high power diodes/thyristors (also 10-32 UNF)
    M5x0.75           threaded ferrite cores
 t  M5x0.75           on some adjustable reamers (Beck)
*   M5x0.8 STI        ...see 6.040x0.8 (screw thread insert)
H   5x0.8             watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh5x0.8           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
==  M5(x0.8)          M5, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, DIN coarse, SI M.MA except France except Japan; new JIS coarse, ISA A (1940), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81
 %  M5 keg            pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
    M5                hex head wrench size: 8 (ANSI/ISO/DIN/JIS)
    M5                very common general purpose size
 g  M5x0.8            some piping systems, push-in quick couplers, small steam engines (Wilesco); alternative is 3/16-32 ME; see also 3/16-40 ME, 1/4-40 ME, 1/4-32 ME
 g  M5                small pneumatic tubing ports (also M3, 10-32, 1/16 NPT, 1/8 NPT, G1/8)
 %  M5x0.8            ISO 6149 hydraulic ports
 %  M5x0.8            steel waterjet cleaner nozzles (2000 bar)
    M5x0.8            semiconductor packaging, stud-mounted diodes/SCRs; typ. DO4, DO-203AA; imperial is 10-32 UNF; TO-10, TO-59, TO-61, TO-83, TO-208AD, TO-94, TO-209AC
    M5                electrical binding posts, 30..180A; terminal blocks, pitch 15mm, 85A/115A/130A
 t  M5x0.8            on some carbide bit toolholder clamps
 t  M5                on some tooling collets; internal thread in shank of a mini-ER08 collet, ER DIN 6499
    M5(x0.8)          low-cost car roof antennas, male on antenna; also M4, M6, M5x0.5, M5x0.75
    M5                on bicycles; common on luggage racks, mudguards; many uses, incl. derailleur wire pinch bolts/nuts, disc rotor mounting bolts, fender and racks mounts, water bottle cage bolts, and others
    M5x0.8            bike wheel spokes
    M5x0.8-6H         19" rack mount screws, relatively uncommon; also M6, 10-32, 12-24
    M5                straight hooks/screw eyes, 20kg; cup hooks, 12.5kg
    M5x0.8            GoPro camera thumbscrew, in the 3+2-prong mounting adapter, 20mm long (M5x20)
    M5x0.8            deceptively similar set, almost-same: 3/16-32 BSF, 3/16-32 BSC, 10-32, 2BA, M5x0.8
T   M5x0.8            present in GEKO G38300 thread cutting set
H   5x0.834           Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   5.00x0.90         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
H   M5x0.9            US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; coarser than ISO coarse M5x0.8
====M5x0.9            5M0.9, JIS, SI M.MA France-Japan-only, SI (1971); old (1972 and earlier) Japanese coarse JIS standard; "French Metric" (as of ISA 1940), French automobile (Pas Normal), "series D" (TM 9-254, 1958); Japan changed to M5x0.8 in 1960s, deleted from JIS B 0209 in 1969
    M5x0.9            on some early Japanese bikes, rare; cross-groove screws often marked with center punch
T   M5x0.9            in "D4140" cutting set
H   5x1.0             PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
====M5x1              "ISO-other", "metric special"
 %  M5x1              some water/steam nozzles on gastro equipment (maybe M5x0.8 with 1mm orifice?)
    M5x1              briefly used by some Japanese bike manufacturers in the distant past, eg. ignition coil holders on 1964 YG-1 racing bike
    M5x1              on some older cars, eg. 1974 Peugeot Simplex
    M5x1              on bicycles; water bottle cages, stems, mountain bike brake rotors, and other bicycle frame fittings such as downtube cable guides and number plate braze-ons
@   E5(x1)            Edison thread, 1mm pitch; lightbulbs, Liliput (LES); Indicator lights, decorative lights; BS 98:1962, "Lilliput"; see also E5.5, likely identical
s   5x1.25            self-tapping screws, IBI-ZAS; asymmetric 40° thread
H   5.0x1.4           Armengaud thread, V-thread, 76° (later 55°), historical
s   5-16              5x1.59; self-tapping screws type B
s   MG5x1.60          thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
M   HA 5              5x1.75, medical implants, bone screws, shallow thread; cortical bone screw; asym thread 35/3° rounded, minor dia 3.5mm; DIN 58810, ISO 5835:1991
s   4.5x2             thread-forming screws, Plastite 45, for plastic; 45° thread
s   5x1.8             thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
s   5-14              5x1.81; self-tapping screws type P
s   5x2               thread-forming screws, Polymate, for plastic, 40° twin thread
s   5-12              5x2.12; self-tapping screws type A
s   5x2.2             thread-forming screws, Plastite 45, for plastic; 45° thread
W   5x2.2             wood screws, DIN
s   5x2.24            thread-forming screws, Plas-Tech 30, for plastic, 30° thread
s   5x2.25            threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   M5x2.24           thread-rolling screws, EJOT PT style, for thermoplastics, 30°
s   M5x2.3            thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
@o  0.20-60 Whitw.    5.08x0.423; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
@o  0.20-48 Whitw.    5.08x0.529; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
@   0.2001-36         STI-#8-36, 5.08x0.706; screw thread insert thread, ASME B18.29.1
H   0.2-36.10         Holtzapffel & Co. (1856), historical; 5.08x0.704; tap/die "N", comb-screw tool no.10, mandrel guide no.6
H   0.200-24          Whitworth thread proposal, 1857
@   5.100-24          CTV5-24, bicycle tire valve, Japanese CTV specification
W   5.1x2.2           wood screws, M/M
H   5.12x0.7815       Mechaniker thread no.21, 32.1/2 tpi, 58° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
=====#11 screw        wood/machine screw gage; 0.20268" 5.1481mm (American Screw Co. old standard)
@   11-30
@   11-28
@   11-24             American Screw Company (0.206-24, Machinists Handbook 1909)
    11-24             ...whiskey tango foxtrot???
W   11-12             wood screw #11, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), very unusual
=====6 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.203", 5.156mm
=====6 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 13/64", 0.20313", 5.159mm
    13/64-36          sewing machines, Singer tap TE315
@   13/64-32          Sellers
@   13/64(-24)        British Standard Whitworth, small; 55°; W5.16x1.058
@   13/64-24
    13/64-24          in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), USS
=====4 AWG            American Wire Gauge, Brown&Sharpe, 0.2043", 5.189mm; copper conductors, 21.2mm2, 0.8152mΩ/m, 70..95 amps (60/90°C)
 w  .205-28           Winchester 1886 rifle, tang screw
====.209-36           5V1, Vg5, 5.15x0.705
@   Vg5               tire valve, DIN 7756, equal to 5v1
@   5v1               tire valve, ISO 4570-1, M5.15x0.705 (36 tpi), also .209-36, VO-07-2 (ETRTO std.1), 5V1-2 (ETRTO std.2)
 g  5V1               "Schrader valve", on eg. bicycle/moped/motorbike/passenger car/some tractor tires; internal bore thread; see 8V1 (7.68x0.794, .305-32) for external thread
@   0.2046-32         STI-#8-32, 5.2x0.794; screw thread insert thread, ASME B18.29.1
====5.23x1.058        5V2, Vg5.2, 5.23-24; narrower than Schrader valve to fit early narrow bicycle tire rims
@   Vg5,2             tire valve, DIN 7756, equal to 5v2
@   5v2               tire valve, ISO 4570-1,  5.23x1.058 (24 tpi), bicycle tire valve, Presta/SV/French/Sclaverland thread; Vg5.2, VO-08-1 (ETRTO std.1), 5V2-1 (ETRTO std.2)
 g  5V2               "Presta valve", on bicycle tires; external thread of tip part of both threaded and unthreaded versions; external stem thread on threaded is 6V1 (5.98.0x0.794)
H   5.29x0.900        FS 1, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 1, 0.2083-28.2
H   5.30x0.5229       Mechaniker thread no.20, 48.4/7 tpi, 53° (size-specific); Siemens-Halske, German, in use until 1925, historical
====1BA               BA 1, 5.30x0.90, 47.5°, British Association standard BS 93-1951, odd gauge, not recommended for general use
 g  M5.3x0.9          some gas burner nozzles
    1BA               RC model engines, glow engines, Oliver Tiger Cub propnut (sleeve nut), PAW 09 range of diesels
T   1BA               assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
@   5.330-36          CTV5-36, bicycle tire valve, Japanese CTV specification
====.210-36 UNS       car-bike tire valve, Schrader/AV/American internal thread, M5.309x0.7056mm (5v1), also .209-36
H   0.21-28.88        Holtzapffel & Co. (1856), historical; 5.334x0.88; tap/die "M", comb-screw tool no.9 (other source says size "L")
@g  5.370-24          5V2, bicycle tire valve, Japanese CTV specification
=====5 SWG            British Standard Wire Gauge, 0.212", 5.385mm
    5.4-48            British endoscope lamp housing, type C (external thread), lamp No.1; 2mm long thread
=====#12 screw        wood/machine screw gage; 0.21576" 5.4803mm (American Screw Co. old standard) or 0.216" 5.486mm (ASME)
@   12-64
@   12-60
@   12-56 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
@   12-48 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
@   12-40 UNS         NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
    12-40             on antique radios, on El-Menco trimmer caps
@   12-36 UNS         NS, ASME B1.1-2003 Appendix D
=== #12(-32) UNEF     0.216-32, M5.486x0.794, secondary size, 32UN, ASME, UNJEF, NS, ANEF (H28 1944), NEF (H28 1957), UNEF/UN 2nd (H28 1963), "series C" (TM 9-254, 1958), "32N", BS 1580:1962
    12-32             some bushing EMC filters
    12-32             RC model engines, glow engines, some propnuts
    12-32             said to be on some old cars and firearms
    12-32             on cars, spark rod on 1910 Ford Model T
    12-32 NS          in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
@   12-30
=== #12(-28) UNF      0.216-28, M5.486x0.907, secondary size, 28UN, ASME standard (1907, Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935, H28 1950/1957), UNF/UN 2nd (H28 1963), "series B" (TM 9-254, 1958), "28N", JIS B 0212, BS 1580:1962
    12-28             in some antique/classic automobiles, 1920 Indian Motocycle, common pre-war size
    12-28             found on Ford Model T
    12-28             in some old car carburettors
    12-28             some bushing EMC filters
 w  12-28             on firearms, in Brownells screw kits; Winchester lever action tang screw
*   #12-24 STI        ...see 0.2701-24, 6.86x1.06 (screw thread insert)
==  #12(-24) UNC      0.216-24, M5.486x1.058, secondary size, ASME special, American Screw Co., UNJC, ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935, H28 1950/1957), UNC 2nd (H28 1963), "series A" (TM 9-254, 1958), Sellers, JIS B 0210, BS 1580:1962, American Screw Company (0.221-24, Machinists Handbook 1909)
!   12-24 UNC-2B      19" rack mount screws, dia. between 4.8..5.5mm, now most common in telecom/computer prethreaded racks; also 10-32, M5, M6
    12-24             machine screw, listed in 1905 edition of Brook's Automobile Handbook
    12-24             door butt hinges, US, very common
    12-24             Lock Cylinder Assembly on a SnapOn lock
    12-24             "7/32 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    12-24             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/8..1.3/4")
 w  12-24             on firearms, in Brownells screw kits
s   12-24             self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   12-24             thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
s   12-24             self-drilling, Tek screws (CSD), SAE J78-1998, also "series 500"
@   12-22
@   12-20 NS          American Screw Co., Sellers
    12-20             on old "victorian" furniture
    12-20             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/8..1.3/4")
 t  12-20             used on a lot of early Stanley tools, including the Bailey planes (Stanley rolled threads, resulting in notch smaller dia, rounder crests); frog screws, handle toe screws, handle/toe bolt; almost identical to 7/32-20 BSW (Record)
    12-20 NS          quite cross-compatible with 7/32-20 BSW; extra-coarse pitch good for old brittle cast iron
s   12-16             self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
s   12-16             self-drilling, "type 3 truss connector", light steel framing screws
s   12-14             self-tapping screws type B, type AB, type 25; 5.5x1.8; coarse, sharp; ANSI B18.6.4
s   12-14             self-tapping screws type P482, for plastic
s   12-14             Dril-Kwick self-drilling self-tapping screws; Plasti-Fast screws
s   12-14             self-drilling, Tek screws (BSD), SAE J78-1998
s   12-14             self-drilling, "type 3 truss connector", light steel framing screws
s   12-14             self-drilling, roofing screws
W   12-13x2           wood screw type II #12, double-thread, FF-S-111D 1974
s   12-11             thread-rolling screws, Plastite style, 48deg 2-lead
s   12-11             self-tapping screws type A; root dia 0.16in/4.06mm
W   12-11             wood screw #12, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ASA, ANSI B18.6.1
s   12-8              self-drilling, light steel framing screws
W   12-8              deck screws
W   12-8              drywall and particle board screw, coarse thread; pitches 8,9
*   5.5               ...see #12   - rounding error
@   M5.5x0.2          DIN 13-2
@   M5.5x0.25         DIN 13-2
@   M5.5x0.35         DIN 13-2
 o  M5.5x0.35         lens mount (1.7", 1/5.8", 1/5", 1/4" sensors)
=== M5.5x0.5          ISO 261 3rd, ISO tertiary fine, ISO 262 2nd choice, BS 3643-1:1981 3rd fine (avoid), JIS B 0211, SI M.MB, ISA B (1940), DIN 13-3, DIN 519 (avoid), GOST 9150-59 constant, GOST 24705-81
 o  M5.5x0.5          lens mounting ring, for 5mm-dia lens mounts, eg. Thorlabs
 %  M5.5x0.5          some tube fittings, rare
 C  M5.5x0.5          on some fiber optic connectors, RF coax connectors (eg. SAA-75 series); also M8x0.75
    M5.5x0.5          some leadscrews
    M5.5x0.5          Kyocera SS4N M5.5X0.5 Shim Screw
    M5.5x0.5          some e-cigarette atomizer threads, rare; on Protank 3 Clearomizer
 w  M5.5x0.5          on Japanese WW2 rifles; Type 99 short front band (also M5x0.5, M6x0.75); T-38 rear tang screw (also M6x0.9)
====M5.5x0.7          "metric special"
====M5.5x0.75         DIN 13-4, "ISO-other"
 t  M5.5x0.75         on some adjustable reamers (Beck)
H   5.5x0.834         Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   5.5x0.9           watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   Lh5.5x0.9         Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   5.50x0.90         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
====M5.5x0.9          M5.5; ISO tertiary coarse, ISO 262 2nd choice, DIN 13, SI M.MA plus France except Japan, unusual French Metric (as of ISA 1940, avoid size), French automobile (Pas Normal), ISA A (1940), "series D" (TM 9-254, 1958); deleted from JIS B 0209 in 1969; not defined in ISO Coarse?
    M5.5x0.9          watchmaking; Bergeon taps
@   M5.5x1
    M5.5x1            model aircraft; propeller lock nut, OS Max FS-52S Surpass engine (with M4x0.7)
@   E5.5(x1)          Edison thread (E thread DIN 40400), 1mm pitch; lightbulbs, Liliput (LES); Indicator lights, decorative lights
=== ST5.5(x1.8)       self-tapping ISO #12; ISO 1478, EN 21478, DIN 7970; 60°; root dia 4.17mm; secondary size?
s   M5.5x1.8          self-tapping screws type B, type AB, type 25, metric variant of #12-14
s   5.5x1.81          self-tapping screws, DIN 7970
W   5.5x2.2           confirmat screw, fine thread, #12-~11.5
s   5.5x2.3           thread-forming screws, Plastite 48-2, for plastic; 48deg twin thread
W   5.5x2.4           wood screws, DIN
W   5.5x2.4           wood screws, M/M
=====5 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 7/32", 0.21875", 5.556mm
@   7/32-60 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   7/32-40 ME        Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
@   7/32-40 NS
    7/32-40 UN        adjuster screw, AMAL carburettors on British bikes
    7/32-40           on some sewing machines, eg. Juki
 w  7/32-40           rifles, peep sight apertures, Lyman and Williams; standard on tang sights; others also 10-32
@   7/32-38
@   7/32-32 ME        Model Engineer, Whitworth-based, 55°, est.1912; some model boiler fittings, rare (32 tpi on this diameter nonstandard?)
@   7/32SM32          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100) (not in Guide to World Screw Threads), M5.56x0.796
    7/32-32           sewing machines, Singer tap TW20060, TW20063, alternative #12-32 UNEF
@   7/32-32 NS        "series C" (TM 9-254, 1958), "32N"
    7/32-32           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    7/32-32           vintage Harley Davidson motorcycles; chassis, gas tank top screw, 1918-35 all, 1937-73 "45"
    7/32-32           RC model engines, glow engines, O.S. .15FP propnut, TT .18
@   7/32-28 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   7/32(-28) BSF     British Whitworth Fine-pitch, small; 55°; W5.56x0.794; old standard; BS 84-1956 (secondary size, avoid if possible); in British Standards Interim Report 7270-1919
@   7/32-28           Sellers
    7/32-28 UNJF      some scientific instrument ports, for 1/8 in tube, rare or misnomer?
    7/32-28           Hercus lathes, gib screw
H   7/32-26 CEI       5.56x1.058, Original Cycle, British bicycles, 60°, historical
@   7/32-26 BSC       British Standard Cycle, CEI, bicycles; bolts and nuts
@   7/32(-24) BSW     British Standard Whitworth, small; 55°; W5.56x1.058; 7/32W24 (former JIS B 0210); old standard; secondary size, avoid if possible
 t  7/32-24 BSW       on some Stanley/Record tools (Bailey planes), frog adjusting plate screw
H   7/32-24           stove bolt series, "SB", manufacturer standard, USA (more common than -32?)
@   7/32-24 stove     stove bolt, sizes from Strelinger catalog of 1895; old standard (Machinists Handbook 1909); 60° Sellers-like with wider root/crest flats (1/4-18 flats equal 11 tpi, as by Machinery's Encyclopedia for 1917)
@   7/32-24 NS        "series C" (TM 9-254, 1958), USS, "UNRC"
    7/32-24           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    7/32-24           "7/32 stove bolt" (interchangeable with #12-24), loose-fit tolerance, UNC-1A; American National standard
H   7/32-22           stove bolt series, "SB", manufacturer standard, USA; new standard (Machinists Handbook 1909)
@   7/32-20 BSW
 t  7/32-20 BSW       on some Stanley/Record tools (Bailey planes); Record (Stanley uses almost identical #12-20); frog screws, handle/knob bolt, handle toe screw, frog adjusting plate screw
    7/32-20 BSW       quite cross-compatible with #12-20 NS
=====5 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.220", 5.588mm
H   0.220-28          "220 fine", proposed, now 216 or #12, CUES Ottawa 1945 proposal
H   5.58x1.0367       Mechaniker thread no.19, 24.1/2 tpi, 62° (size-specific); Siemens-Halske, German, in use until 1925, historical
H   0.220-24          "220 coarse", proposed, now 216 or #12, CUES Ottawa 1945 proposal
H   0.225-24          Whitworth thread proposal, 1857
H   5.75x0.7815       Mechaniker thread no.18, 32.1/2 tpi, 48° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
W   5.8x2.6           wood screws, M/M
=====#13 screw        wood/machine screw gage; 0.22892" 5.8146mm (American Screw Co. old standard)
@   13-24
@   13-22             American Screw Company (0.234-22, Machinists Handbook 1909)
@   13-20
@   13-14             Sellers
W   13-11             wood screw #13, Machinists Handbook 1909 (AmerScrewCo diameter)
=====3 AWG            American Wire Gauge, Brown&Sharpe, 0.2294", 5.827mm; copper conductors, 26.7mm2, 0.6465mΩ/m, 85..115 amps (60/90°C)
@   0.2306-32         STI-#10-32, 5.86x0.794; screw thread insert thread, ASME B18.29.1
=====4 SWG            British Standard Wire Gauge, 0.232", 5.893mm
M   5.9x0.4/20'taper  on bone plates, screw head locking thread, 60° thread, 20° taper; tap thread cone 3.2 to 5.9 mm dia 8mm long, 20 teeth
M   5.9x0.4/20'taper  on bone plates, screw head locking thread, 55° thread, 20° taper; tap thread cone 2.5 to 5.9 mm dia 10mm long, 25 teeth
M   5.9x0.5/20'taper  on bone plates, screw head locking thread, 60° thread, 20° taper; tap thread cone 2.9 to 5.9 mm dia 9mm long, 18 teeth
M   5.9x0.5/20'taper  on bone plates, screw head locking thread, 55° thread, 20° taper; tap thread cone 2.9 to 5.9 mm dia 9mm long, 18 teeth
M   5.9x0.6/20'taper  on bone plates, screw head locking thread, 55° thread, 20° taper; tap thread cone 3.8 to 5.9 mm dia 6.6mm long, 11 teeth
H   5.9-50            watch pendant thread, size 18, historical, 5.9x0.508
=====4 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 15/64", 0.23438", 5.953mm
@   15/64-32          Sellers
@   15/64(-28) BSW    British Standard Whitworth, small; 55°; W5.95x0.907
@   15/64SM28         German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M5.95x0.907
    15/64-28          sewing machines, Singer tap TE548; on some industrial Juki MO
@   15/64-28          Sellers
@   15/64-26 BSC      BSCY, not in standard series? (not in Guide to World Screw Threads)
@   15/64-24
    15/64-24          in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware), USS
    15/64-24          sewing machines, Singer tap TE265
====5.98x0.794        6V1, Vg6, 5.98-32; for Japanese CTV specification see 6.160-32
@   6V1               tire valve, ISO 4570-1, 5.98.0x0.794 (32tpi) (similar to M6), bicycle tire valve, Presta/SV/French/Sclaverland outer thread; Vg6, VO-08-2 (ETRTO std.1), 6V1-1 (ETRTO std.2)
@   Vg6               tire valve, DIN 7756, equal to 6v1
 g  6V1               "Presta valve", on bicycle tires; external stem thread on threaded versions; external thread on tip part is 5V2 (5.23x1.058)
 g  VG6x32            on bicycle tires, union nut racing valve
===== 6mm Cu tube     6mm outer-dia tube; ASTM B88M type A/0.9mm, B/0.7mm, C/0.6mm; EN 1057, wall th 0.6,0.8,1.0mm; BS 2871, table X (wall th 0.6mm, 13.3 MPa), Y (0.8mm, 14.4 MPa), Z (0.5mm, 11.3 MPa)
@   M6x0.2            DIN 13-2
@   M6x0.25           DIN 13-2
 t  M6x0.25           adjustment and micrometer screws, common metric, housings usually with M10x1 or M10x0.5 thread
 o  M6x0.3            lens mount (1/4" 1/3.2" sensors), cellphone cameras, for digital cameras/computer/electronic video devices, eg. OV9712
@   M6x0.35           DIN 13-2
 o  M6x0.35           lens mount, "M6" (1/4", 5.2mm, 4.85mm sensors), believed to be in Raspbery Pi camera v1; cellphone cameras
    M6x0.35           adjustment screws
====M6x0.5            ISO extended, DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
 o  M6x0.5            lens mount, aspheric lens housing
 %  M6x0.5            4mm tubing sleeve nuts, tube fittings
 %  M6x0.5            some gas burner nozzles
 %  M6x0.5            grease fitting nipples, "zerk", metric, uncommon; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
    M6x0.5            some stove thermocouples, panel nuts
    M6x0.5            set screws, valve adjust screws
 t  M6x0.5            adjustment screws, in some micrometers
 t  M6x0.5            screws/clamp nuts on some micrometer heads mounting stems
    M6x0.5            on some carbide guide bushes
    M6x0.5            on industrial sensors (also M12x1, M18x1, M3x0.35, M4x0.35, M5x0.5)
    M6x0.5            panel nut, on some 3.5mm jack connectors, some 3mm-dia LED panel holders
    M6x0.5            threaded ferrite cores
@   M6x0.6
 g  M6x0.6            on tires, tubeless valve stems (typo? can it be M6x0.8?)
    M6x0.6            atypical; on some Tesla cars (bumper fascia), old model steam engine whistles...
    M6x0.6            some odd locknuts? (aliexpress kit)
====M6x0.7            ISO extended
 %  M6x0.7            some tube fittings
 t  M6x0.7            some tooling collets
=== M6x0.75           ISO 261 1st, ISO primary fine, ISO 262 preferred, electrical conduit EN 60423, BS 3643-1:1981 1st fine, JIS B 0211, DIN fine, French automobile (Pas Fin), SI M.MB, ISA B (1940), SI fine (1971), DIN 13-4, GOST 9150-59 constant, GOST 24705-81
    M6                hex head wrench size: 10 (ANSI/ISO/DIN/JIS)
    M6                common general purpose fastener
 %  M6x0.75           "E6", electrical conduit
 %  M6x0.75           some gas burner nozzles
 %  M6x0.75           some manometer attachment threads, on some small steam engines
 %  M6x0.75           grease fitting nipples, "zerk", metric, less common than M6x1; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 t  M6x0.75           chuck mount thread, some small chucks, e.g  0.3-4mm, has converters to shafts, 2.35mm, 3.0mm
 t  M6x0.75           some tooling collets
 t  M6x0.75           probe attachment on some micrometer dials, dial extension rods
    M6x0.75           bulkhead switch/button nut thread
    M6x0.75           panel nuts, on eg. small blue 3-amp leverflip switches
    M6x0.75           some bushing EMC filters
    M6x0.75           microwave tuning elements, common size; also M8x0.75
    M6x0.75           threaded ferrite cores
    M6x0.75           thermocouple ports on eg. gas stoves/furnaces/ovens
    M6x0.75           on bicycles; attachment chain wheel, Suntour brand
 w  M6x0.75           on Japanese WW2 rifles; Type 99 forward and middle trigger guard, rear tang screw, long lower band (also M5x0.5, M5.5x0.5)
T   M6x0.75           present in N3-II, GEKO G38300 thread cutting set
====M6x0.8            ISO extended
 %  M6x0.8            some tube fittings
    M6x0.8            on some motorcycles, brake lights, panel nuts (eg. bike standard brake switch), carburetors, on some automotive rivet-in nuts
H   6x0.834           Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   6.00x0.8965       Mechaniker thread no.17, 28.1/3 tpi, 55° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
====M6x0.9
 w  M6x0.9            on Japanese WW2 rifles; T-38 forward and middle trigger guard (also M5.5x0.5)
 p  M6x0.9            on packaging tubes; small tubes, uncommon
    6-28              dash screw in some Ford Mustang (M6x0.907, not #6-28)
*   M6x1 STI          ...see 7.300x1 (screw thread insert)
H   6x1.0             PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
@   0BA               BA 0, 6.00x1.00, 47.5°, British Association standard BS 93-1951; threads well to 6mm rod; alternative is M6; in bigger things replaced with 7/32 BSF
    0BA               can be replaced with M6x1 for non-critical applications
T   0BA               assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
H   6x1               watchmakers' screws, Thury, historical; Serie horlogere d'apres Thury
H   6x1               S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   6x1               SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   6.00x1.00         small machine screws, French historical standard, Societe d'Encouragement pour l'Industrie Nationale 1915
H   6.00x1.00         French metric aircraft threads, from US Bureau of Standards LC18 1923
==  M6(x1)            M6, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ, DIN coarse, JIS, SI M.MA, SI (1971), "French Metric", French automobile (Pas Normal), "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), ISA A (1940), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M coarse, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
 %  M6 keg            pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M6x1              ISO 6149 hydraulic ports
    M6                very common general purpose size
 %  M6x1              some piping systems, push-in quick couplers, fittings, lubrication, hydraulics
 %  M6                miniature couplings, common on lab equipment, common in microfluidics, less common than 1/4-28 (also 10-32, 6-40)
 %  M6x1              piping and nozzles of central lubrication
 %  M6x1              grease fitting nipples, "zerk", metric, common; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M6x1              waterjet sapphire nozzle inserts (1400,2800 bar)
    M6x1              common MIG welding torch tips, male on tip (also 1/4-28)
    M6x1              semiconductor packaging, stud-mounted diodes/SCRs; typ. DO5, DO-203AB, TO-48, TO-208AA; imperial is 1/4-28 UNF
    M6                electrical binding posts, 160/250A; terminal blocks, pitch 17.78mm/0.7" (160A)
    M6x1              threaded ferrite cores
    M6x1-6H           19" rack mount screws; also M5, 10-32, 12-24; common on Hewlett-Packard
    M6                low-cost car roof antennas, female (less commonly male) on antenna; also M4, M5
    M6x1.0            pneumatic cylinder, MAL 16mm
    M6                for electrical cable holders/clamps
 t  M6x1              rotary power tools - orbital sanders, metric standard, female (sometimes male) on arbor; see also 5/16-24; for Dremel-style attachments for chuck-mount 1/4-shafts
 t  M6                small rotary tools, Dremel-style mandrels for wheel center hole 1/4" or 6mm; see also M1.7, M2, M2.5
 t  M6x1              common FDM 3d printing nozzles
    M6x1              on bicycles; many uses, including brake caliper mounting bolts, brake pad bolts/nuts, some fender racks, some brake adjusting barrels, bandage screws for freewheel hub, clevis, chain tensioners, adjustments, mudguards
    M6                on metric electric fence insulators (also M8)
 S  M6                architectural suspension systems, typ. for 3/64" 1.19mm, 1/16" 1.59mm cable
 S  M6x1              on lamps, tubes for wires; less common than M10x1, M8x1
    M6                straight hooks/screw eyes, 35kg; cup hooks, 25kg
    M6x1              thread insert, external thread; EZ-Lok steel, 6-32, M3x0.5
T   M6x1.0            present in GEKO G38300 thread cutting set
 p  M6(x1)            on packaging tubes; small tubes
H   6x1               Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   6x1               S.F. No.0, French thread, S.F., System Francais; 60°; historical, before introduction of SI
H   6x1 VDI           VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh6x1             Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   6x1.000           FS 0, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size 0, 0.2362-25.4
====M6x1.25           "ISO-other", "metric special"
 p  M6x1.25           on packaging tubes; uncommon
s   M6-20             self-tapping, "type 2 H-fix", light steel framing screws
s   6-19              6x1.34; thread-rolling screws, Plas-Fix, for plastic, 60° thread
s   6x1.4             self-tapping screws, IBI-ZAS; asymmetric 40° thread
====M6x1.5
    M6x1.5            on some Zetor trucks
s   6-14              6x1.81; self-tapping screws type B
s   6x2               M3 threaded insert, DIN 7965; 60°, lesser dia 4.5mm
s   MG6x2             thread-forming screws, Mag-Form, for low ductility materials, eg. magnesium die-casting; wide-spaced thread with broad flank angle
s   6x2.1             thread-forming screws, Pushtite II, push-in screw-out, for plastic; asymmetric 10+70° thread
s   6-12              6x2.12; self-tapping screws type P
s   6x2.4             thread-forming screws, Polymate, for plastic, 40° twin thread
s   M6x2.5            thread-rolling screws, PLAS FIX 45 style, for plastic, 45° thread
s   6x2.5             thread-forming screws, Plastite 45, for plastic; 45° thread
s   6-10              6x2.54; self-tapping screws type A
W   6x2.6             wood screws, DIN
s   6x2.65            threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
s   6x2.69            thread-forming screws, Plas-Tech 30, for plastic, 30° thread
@   6.040x0.8         STI-M5x0.8, screw thread insert thread, DIN 8140-2
=====4 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.238", 6.045mm
H   0.24-36.10        Holtzapffel & Co. (1856), historical; 6.096x0.704; tap/die "L", comb-screw tool no.10, mandrel guide no.6 (other source says size "M")
=====#14 screw        wood/machine screw gage; 0.24208" 6.1488mm (American Screw Co. old standard) or 0.242" 6.147mm (ASME); unusual now, replaced with 1/4" size
*   #14               ...see 1/4 (eg. #14 sheetmetal screws)
@   14-36
@   14-32 NS
@   14-28             special?
====14-24 NS          #14 NF, ASME standard (1907, Machinists Handbook 1909), NS, American Screw Co.; old ASME series, not in American Standard, "series C" (TM 9-254, 1958), Sellers, "UNF"
    14-24             on some old electrical binding posts, terminal blocks, electrical connections
    14-24             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/8..2")
    14-24             some antique Johnson outboard boat motors
    14-24             found on Ford Model T
@   14-22
====14-20 NS          #14 NC, ASME special, NS (1/4-20 is preferred), American Screw Co., "series C" (TM 9-254, 1958), "UNC", Sellers, American Screw Company (0.246-20, Machinists Handbook 1909); old ASME series, not in American Standard; #14 coarse, !! do not confuse with 1/4-20 !!
    14-20             machine screw, listed in 1905 edition of Brook's Automobile Handbook
    14-20             common on old Ford automobiles; Bendix cover and magnet clamp screws
    14-20             common on old (up to 1920's) boat outboard motors; also 16-20
    14-20             standard machine screw as by US Army Handbook of Quartermasters, 1930 (American Screw Co. diameter, lengths 3/8..2")
s   14-20             self-drilling, Tek screws (CSD)
s   14-20 NS          Tek screws for roofing/siding (Australia), Tek CSD
@   14-18             American Screw Co.
s   14-16             some anchor screws, self-tapping, 6.15x1.59
s   14-16             self-drilling, "type 3 truss connector", light steel framing screws
s   14-14             self-drilling, Tek screws (BSD)
s   14-14             self-drilling, "type 3 truss connector", light steel framing screws
W   14-12x2           wood screw type II #14, double-thread, FF-S-111D 1974
s   14-10             self-tapping screws type A; root dia 0.18in/4.57mm
s   14-10             self-drilling, Tek screws (ASD)
s   14-10             self-drilling, roofing screws
W   14-10             wood screw #14, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ANSI B18.6.1, larger less common size
W   14-8              deck screws
@   6.160-32          6V1, bicycle tire valve, Japanese CTV specification; see also 5.98-32 for European specification
@   0.2441-24         STI-#10-24, 6.2x1.06; screw thread insert thread, ASME B18.29.1
W   6.2x2.7           wood screws, M/M
@   0.246-27          gas (brass pipe) thread, size No.4, 6.248x0.941; 27-thread series, fine threads for thin-wall tubing
H   6.28x1.1723       Mechaniker thread no.16, 21.2/3 tpi, 62° (size-specific); Siemens-Halske, German, in use until 1925, historical
*   6.3               ...see 1/4   - rounding error
@   M6.3x0.5
 o  M6.3x0.5          lens mount, for some for Toshiba/Elmo cameras, for 1/6" (1/4"?) sensors; flange focal dist. usually 8.45mm; JIIA image size class I, 2nd choice; in machine vision
@   0.248(-28)        BS copper pipe thread, BScopper, 1/8" inner dia; W6.3x0.907
H   M6.3x1            US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; not in ISO series
====M6.3x1            suggested to ISO TC2 meeting as part of OMFS (Optimum Metric Fastener System), to give size closer to 1/4"
    M6.3x1            used for short time by General Motors, then abandoned; was confusing with no significant benefits over M6x1
 t  M6.3x1            on tools, McCulloch Mini Mac chainsaw, Oregon, bar stud nuts
=== ST6.3(x1.8)       self-tapping ISO #14; ISO 1478, EN 21478, DIN 7970; 60°; root dia 4.88mm
s   M6.3x1.8          self-tapping screws type B, type AB, type 25, metric designation/variant of 1/4-14
s   6.3x1.81          self-tapping screws, DIN 7970
W   6.3x2.4           confirmat screw, fine thread, #14-~10.5
W   6.3x2.6           confirmat screw, standard deep thread, #14-~9.8
W   6.3x3.0           confirmat screw, chipboard thread, #14-~8.5
*   1/4" copper       ...see 0.389-20, W9.88x1.27
*   1/4" BSP          ...see G1/4-19, W 33/64-19 W13.10x1.34
*   1/4" NPT          ...see 17/32-18, M13.72x1.41
*   1/4 JIC           ...see 7/16-20; fittings/tubes, dash size -4, nominal inner dia 1/4"
=====3 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 1/4", 0.2500", 6.350mm
===== 1/4 Cu tube     DN6, 6.35mm outer-diameter tube; AS 1432 wall thick 0.91mm/20g (A/green, 11.3 MPa), 0.71mm/22g (B/blue, 8.5MPa); AS/NZS 1571, wall thick 0.71mm (9.17 MPa), 0.81mm (10.6 MPa), 0.91mm (12.1 MPa)
    1/4-254           adjustment screws, 6.35x0.10; eg. on optical mirror mounts
    1/4-170           adjustment screws, 6.35x0.15; eg. on optical mirror mounts
    1/4-127           adjustment screws, 6.35x0.20; eg. on optical mirror mounts
    1/4-100           adjustment screws, common, 6.35x0.254; eg. on optical mirror mounts
====1/4-80 UNS
    1/4-80 UNS        adjustment screws, fairly common; eg. on optical mirror mounts; M6.35x0.3175
@   1/4-72 NS
@   1/4-64 NS
    1/4-64 LH         on Dental-EZ/Custom Air/Ramvac motors
@   1/4-60 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   1/4-60
@   1/4-56 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
@o  0.25-48 Whitw.    6.35x0.529; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
====1/4-48 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
    1/4-48            fountain pens, possible replacement for M6.4x0.5
@   1/4-46
@   1/4-40 ME         Model Engineer, Whitworth-based, 55°, est.1912; standard series
@   1/4SM40           German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M6.35x0.635
====1/4-40 MTP        Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT; 1/4" most common diameter, also 3/16-40 MPT,; also 1/8-56 MPT
@   1/4-40 UST        Universal Straight and Taper; for model steam engines, variant of MTP with 0.005" larger pitch diameter, incompatible with MTP, compatible with straight UNS; by P.M. Research Inc.
 %  1/4-40            "model pipe thread", model boiler/steam engine fittings; also 3/16-40, 1/4-32, 5/16-24; alternative is M6x0.75
====1/4-40 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
    1/4-40            vintage Harley Davidson motorcycles; fuel, Linkert needle, 1927-64
    1/4-40 UNS        panel nut, bulkhead switch/button nut thread,spanner  8.0mm, tip-tip 9.0, th.1.5
====1/4-36 UNS        SAE extra fine (1915/1926); UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  1/4-36            some gas burner nozzles
 %  1/4-36            JIC tube fittings
!C  1/4-36 UNS        SMA coax/fiberoptic connectors, coupling thread; for SSMA see #10-36 UNS
    1/4-36            attachment thread for some antennas, often integrated with SMA coax; usually male thread (female connector) on antenna, sometimes the opposite way; see also 7/16-28 (TNC)
    1/4-36            adjustment screws, eg. needle valves in some carburetors (also 10-32)
@   1/4-32 ME         Model Engineer, Whitworth-based, 55°, est.1912
@   1/4-32 WS         Whitworth Special
@   1/4-32 MTP        Model Taper Pipe; unusual pitch, on some Stuart Beam valves
 %  1/4-32            "model pipe thread", model boiler/steam engine fittings; also 3/16-40, 1/4-40, 5/16-24
=== 1/4(-32) UNEF     M6.350x0.793, primary size, 32UN, "series C" (TM 9-254, 1958), UNJEF, NS, ANEF (H28 1944), NEF (H28 1950/1957), UNF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
 %  1/4-32            tubing systems, common in lab equipment and instrument ports; less common than 1/4-28
 %  1/4-32            some carburettor nozzles, gas jets
 %  1/4-32 UNEF       on some gas plug orifices, nozzles
 C  1/4-32 UNEF       connector, 1/8" 3.12mm jack, metal
 C  1/4-32            coax connector, M-series, "M25"
    1/4-32            some female banana jacks/plugs
    1/4-32            some small spark plugs, common on glow plugs; for airplane model motors
    1/4-32            adjustment screws; some welding torches, some fourwheel damping
    1/4-32            vintage Harley Davidson motorcycles; fuel, Linkert float lever pin, 1927-64
    1/4-32            RC model engines, glow engines, on Tee Dee venturi
    1/4-32 NEF        panel nut, potentiometer, dia 19mm back, dia 3.175mm shaft (3/4", 1/8"), MIL style RV5
    1/4-32            attachment thread for some antennas, male on antenna
    1/4-32            sewing machines, Singer tap TW20069
@   1/4-30
*   1/4-28 STI        ...see 0.2964-28, 7.53x0.907 (screw thread insert)
@   1/4-28 WS         Whitworth Special, Whitform
=== 1/4(-28) UNF      M6.350x0.907, primary size, screw "E" (US), 28UN, ALAM automobile standard (Machinists Handbook 1909), SAE regular, "series B" (TM 9-254, 1958), UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), UNF (B1.1-1935, H28 1950/1957), UNF/UN (H28 1963), "28N", JIS B 0212, aeronautical (H28 1944), BS 1580:1962
i   1/4-28            deceptively similar to 1/4-26 BSC (or BSW) on older British vehicles, do not mistake
    AN4               aircraft bolts, 1/4-28 UNF-3A; AN24, clevis bolt; AN74, drilled head; AN174, close tolerance; AN43, eye bolt (1/4 shank, 3/16 hole); NAS1104/NAS6204 shear bolts
 %  1/4-28 UNF        grease fitting nipples, "zerk", US; common; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 %  1/4-28 UNF taper  SAE-LT; grease fitting nipples, "zerk", US; common; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
    1/4-28 SAE-LT     tapered thread, 1.8° taper (same as NPT), self-sealing; most common size in automotive industry
 %  1/4-28 UNF        waterjet sapphire nozzle inserts (4200 bar)
 %  1/4-28 UNF        on some gas plug orifices, nozzles
 %  1/4-28 UNF        HPLC ports, SSI-brand fittings for 1/16" (and 1/32"?) o.d. tubes (also 6-40, 10-32)
!%  1/4-28            miniature couplings, common on lab equipment, chromatography, common in microfluidics (also 10-32, 6-40, sometimes deceptively similar M6)
 %  1/4-28            chromatography syringe termination, "ChemSeal" (C); see also 5/16-28 (Bubble Free Prime, BFP), M8x0.75 (AccuDil, AD)
 %  1/4-28 UNJF       ports in scientific apparatus vessels; according to: AS5202
    1/4-28            sensor attachment, thermocouple hole standard
    1/4-28            MIG welding torch tips, male on tip (also M6x1)
 t  1/4-28            threaded shanks of some air tools, drill bits, reamers, core drills, gun barrel drills, countersinks (also 10-32, 3/8-24, 7/16-24); female on arbor; common
    1/4-28 UNF-2A     semiconductor packaging, stud-mounted diodes/SCRs; typ. DO5, DO-203AB, TO-48, TO-208AA; metric is M6x1
    1/4-28 UNF        some bushing EMC filters
    1/4-28            billiard/pool cue joining pin (also 5/16-14, 3/8-11, 3/8-10), unusual
    1/4-28            fountain pens, pen mandrel precision Berea, Ariz. Silhouette
    1/4-28            adjustment screws on some orthopedic gear; also 9/32-24, 5/16-24, 5/16-20
    1/4-28            sewing machines, Singer tap TE316, alternative 1/4-28 UNF
    1/4-28            fountain pens, pen mandrel Berea?
@   1/4-28x3          three leads
*   1/4-27 GAS        ...see 0.26-27
====1/4-27 UNS        M6.35x0.941, NS; 27-thread series, fine threads for thin-wall tubing; NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D, "27N"
 S  1/4-27 UNS        on lamps; shade risers, finals; lamp parts, also screws and threaded studs; other common sizes are 6-32, 8-32, 1/4-20
 t  1/4-27            on some toolholders (Armstrong?)
@   1/4(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   1/4-26 TWF        Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====1/4(-26) BSF      British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "E" (UK)
 %  1/4-26 BSF        grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
    1/4 BSF           on British "Seagull" outboard boat motors (1/4,5/16,3/8 BSF)
    1/4-26 BSF        RC model engines, glow engines, early Merco 29/35, Frog 500, Ollie (and Rothwell R250 copy)
T   1/4-26 BSF        basic BSF/BSW tap/die set for car work (1/4-26,20 5/16-22,18 3/8-20,16)
H   1/4-26 CEI        Original Cycle, British bicycles, 60°, historical
====1/4-26 BSC        British Standard Cycle original CEI, older, CEI, bicycles; also as LH; bolts and nuts, crank cotter
    1/4-26 BSC        on older British vehicles; deceptively similar to 1/4-28 NF, do not mistake
T   1/4-26 BSC        basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
====Fg6.35(-26)       6.350x0.977, bicycle screw thread, 60°, DIN 79012
    FG6.35            on bicycles; 1/4-26, crank wedge, nuts
@   1/4-26
H   0.25-25.71        Holtzapffel & Co. (1856), historical; 6.35x0.988; tap/die "K", comb-screw tool no.8, mandrel guide no.5
H   1/4(-24) ADMF     Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; less common size
@   1/4-24 WS         Whitworth Special, Whitform
@   1/4-24 BSC        British Standard Cycle (not in Guide to World Screw Threads)
@   1/4SM24           German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100) (not in Guide to World Screw Threads), M6.35x1.06
    1/4SM24           sewing machines, Singer tap TE65, alternative 1/4-24 UNS
====1/4-24 UNS        NS, "series C" (TM 9-254, 1958), UNS (H28 1963), ASME B1.1-2003 Appendix D, "Harley"
 t  1/4-24 UNS        on some Stanley/Record tools (planes), frog adjusting screw
    1/4-24            vintage Harley Davidson motorcycles; motor, oil pump, cam cover, trans top, etc, common through 1976
    1/4-24            in many antique/classic automobiles, 1920 Indian Motocycle, pre-war Harley motorcycles; common pre-war size; also 5/16-20
    1/4-24            spark plug thread, uncommon
*   1/4-20 copper     ...see 0.389-20, W9.88x1.27
H   0.250-20          Whitworth thread proposal, 1857; 1/4-20 in 1841
*   1/4-20 STI        ...see 0.3150-20, 8x1.27 (screw thread insert)
@   1/4-20 TWC        Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1/4(-20) BSW      British Standard Whitworth; 55°; also "continental Whitworth"; 1/4W20 (former JIS B 0210); BS 84-1956, Whitworth 1841, mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 %  1/4-20 BSW        grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 S  1/4 BSW           tripod screws, less common than 1/4 UNC, interchangeable
 S  1/4 BSW           stage equipment, some microphone stands (cf. 3/8-16 UNC); also 3/8 BSW
    1/4 BSW           can be replaced with 1/4-20 UNC for noncritical applications (~20% strength loss?)
H   1/4-20            sharp "V" thread, 60°, historical, used in USA until 1909
H   1/4-20            Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
==  1/4(-20) UNC      M6.350x1.27mm, 20UN, UNJC, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), UNC (B1.1-1935, H28 1950/1957), UNC/UN (H28 1963), "20N", JIS B 0210, aeronautical (H28 1944), BS 1580:1962
c   1/4-20 UN         UNC standard; 20UN, 20-thread, constant pitch series
 %  1/4-20 UNC        Swagelok fittings, 1/16" tubes
 %  1/4-20 UNC        waterjet sapphire nozzle inserts (3500,3850 bar)
!S  1/4-20 UNC-1A/B   tripod small, M6.35x1.27, DIN 4503, ISO 1222, PH3.6; viewfinder cameras, SLR cameras up to medium format, tripod heads, tripod quick release plates; also 3/8-16, 5/8-11, 5/8-27
 S  TRI 1/4-20        camera tripod mount thread, JIS B 7103; female thread oversized, 0.14mm larger on pitch diameter than UNC; 0.05" max counterbore, 0.197"/5mm min. deep for light cams, 0.375"/9.5mm suggested for heavy cameras
 S  1/4 UNC           tripod/monopod spikes and feet, male on spike, less common than 3/8-16, on smaller tripods, eg. Benro Manfrotto SIRUI; also M8
    1/4-20 NC         electrical feedthrough centerwires
    1/4-20            "1/4 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    1/4-20            most popular furniture thread; trophy products, drawer pulls, giftware assemblies
 S  1/4-20            on lamps (also 1/4-27 where finer thread needed)
 S  1/4-20            common architectural cable suspension coupler
    1/4-20            architectural suspension systems, typ. for 3/64" 1.19mm, 1/16" 1.59mm cable (straight, side)
    1/4-20            optical bench and breadboard mounts, imperial larger (see 8-32)
    1/4-20            low-cost car roof antennas, male or female on antenna; also converters to M6
 t  1/4-20            rotary polishing tools, grinding/polishing tool pads, male on arbor
 t  1/4-20            some mandrels for woodturning
    1/4-20            darts, male on tip, "8mm", connects to metal barrel; see also 2BA thread (more standard), M3
    1/4-20            archery, some stabilizers on bows; adapter to more common 5/16-24 exists
    1/4-20            thread insert, external thread; EZ-Lok steel, 6-32
    1/4-20            small geodetic survey pole segments, attachments, female on attachment; pole tips, male on tip; also 5/8-11 for more common bigger
s   1/4-20            self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   1/4-20            thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
L   1/4-20 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
*   1/4-19 BSP        ...see G1/4, W 33/64-19 W13.10x1.34
 %  1/4-19            tube coupling, JIS 300, 1/4 ("-4"), tapered, or 30-deg male flare on male
*   1/4-18 NPT        ...see 17/32-18, M13.72x1.41
H   1/4-18            stove bolt series, "SB", manufacturer standard, USA
@   1/4-18 stove      stove bolt, sizes from Strelinger catalog of 1895; old and new standard (Machinists Handbook 1909); 60° Sellers-like with wider root/crest flats (1/4-18 flats equal 11 tpi, as by Machinery's Encyclopedia for 1917)
    1/4-18            stove bolt, standard size (3/16-24, 1/4-18, 5/16-18, 3/8-16), as of 1933 "Standards and specifications for metals and metal products", maybe different root/crest flats?
    1/4-18            stove bolt size; do not confuse with NPT/NPTF/PTF/IPS pipe threads!
 h  1/4-18            on some old cars, old tractors
    1/4-18            some military spare parts for eg. armored personnel carriers
    1/4-18x3          triple-lead, rare
@   1/4-16
L   1/4-16 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G, general-purpose only; BS 1104:1957, class 2G/3G/4G/5G
s   1/4-15            self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
@   1/4-14            "14N"
s   1/4-14            self-tapping screws type B, type AB, type 25; 6.3x1.8, #14-14; coarse, sharp; ANSI B18.6.4
s   1/4-14            self-drilling, Tek screws (BSD), SAE J78-1998; also in size 14-14
s   1/4-14            Dril-Kwick self-drilling self-tapping screws; Plasti-Fast screws
s   1/4-10            self-tapping screws type A, obsolete
s   1/4-10            self-tapping screws type PLAST 48/2, for plastic; 48-deg, double-start, sharp thin threads, trilobular
s   1/4-10            self-tapping screws type P482, for plastic
s   1/4-10            thread-rolling screws, Plastite style, 48deg 2-lead
s   1/4-10            self-tapping screws, W.T. type A
W   1/4-10            coach and lag screws (Machinists Handbook 1909, modern), dowel screws
W   1/4-8             deck screws
W   1/4-8             drywall and particle board screw, coarse thread; pitches 8,9
L   1/4x.188          ballscrew, freewheeling, for leadscrews
=====3 SWG            British Standard Wire Gauge, 0.252", 6.401mm
 o  M6.4x0.25         lens mount (1/3" sensors), cellphone cameras, for 1/3" sensors
    M6.4x0.5          fountain pens, Schmidt Rollerball, small FP feeds (Heritance #5), Rollerball cartride systems
    M6.4x0.6          fountain pens, common, Bock size 5 nibs (small)
    M6.4x0.75         fountain pens, Jr Gent 2 feed holder assembly/section (?, measured, untested)
=====#15 screw        wood/machine screw gage; 0.25524" 6.4831mm (American Screw Co. old standard); now sometimes means 0.3120" or 5/16", 7.9248mm or 7.9375mm
*   #15               ...see 0.3120", 0.3125", 5/16", 7.92..7.94mm; wood screws, sheetmetal screws [ref]
@   15-24
@   15-20             American Screw Company (0.261-20, Machinists Handbook 1909)
@   15-18
s   15-15             self-drilling, Tek screws (CSD???)
W   15-10             wood screw #10, Machinists Handbook 1909 (AmerScrewCo diameter)
@   M6.5x0.2          DIN 13-2
@   M6.5x0.25         DIN 13-2
 o  M6.5x0.25         lens mount, 1/3" sensors, uncommon; for digital cameras/computer/electronic video devices
@   M6.5x0.35         DIN 13-2
@   M6.5x0.5          DIN 13-3, DIN 519 (avoid)
 o  M6.5x0.5          some laser collimator lenses
 o  M6.5x0.5          lens mounting ring, for 6mm-dia lens mounts, eg. Thorlabs
    M6.5x0.5          thumb screws on some arthroscopy instruments
    M6.5x0.5          fountain pens, common, Jowo/Schmidt/Heritance size 5 nibs (discontinued), Schmidt roller writer refillable rollerball nibs/rollerball conversion feed, Bock 076/180/060 nibs, Meister nib new style #5 feed assembly
@   M6.5x0.75
 t  M6.5x0.75         on some adjustable reamers (Beck)
    M6.5x0.75         fountain pens, some front end nib assembly
    6.5x1             watchmaking, for clock gong rods; gong rods fitted to iron bases by industry-specific thread size, very tight fit
M   HB 6.5            6.5x2.75, medical implants, bone screws, deep thread; cancellous bone screw; asym thread 25/5° rounded, minor dia 3mm, drill 3.2mm; DIN 58810, ISO 5835:1991
=====2 AWG            American Wire Gauge, Brown&Sharpe, 0.2576", 6.544mm; copper conductors, 33.6mm2, 0.5127mΩ/m, 95..130 amps (60/90°C)
=====3 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.259", 6.579mm
@   0.26-27           gas (brass pipe) thread, size 1/4", 6.604x0.941; 27-thread series, fine threads for thin-wall tubing
H   6.64x0.6047       Mechaniker thread no.15, 42 tpi, 58° (size-specific); Siemens-Halske, German, in use until 1925, historical
 %  0.265-36          on some gas plug orifices, nozzles
=====2 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 17/64", 0.265625", 6.747mm
    17/64-48          sewing machines, Singer tap TW20012
    17/64-32          sewing machines, Singer tap TW20057
H   17/64-26 CEI      Original Cycle, British bicycles, 60°, historical
@   17/64-26 BSC      British Standard Cycle, bicycles, 60°, less common size?; cycle and motorcycle crank cotters
    17/64-24          sewing machines, Singer tap TW20112
H   6.81x1.100        FS -1, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -1, 0.2681-23.1
W   6.8x3.1           wood screws, M/M
=====#16 screw        wood/machine screw gage; 0.26840" 6.8174mm (American Screw Co. old standard) or 0.268" 6.807mm (ASME); now sometimes means 3/8", 9.525mm
*   #16               ...see 0.3750", 3/8", 9.525mm; wood screws, sheetmetal screws
@   16-24
@   16-22             ASME standard (1907, Machinists Handbook 1909), NS (unusual?), Sellers
@   16-20             ASME special, NS, American Screw Co., Sellers
    16-20             machine screw, listed in 1905 edition of Brook's Automobile Handbook
    16-20             common on old (up to 1920's) boat outboard motors; also 14-20
@   16-18             ASME, NS, American Screw Co., Sellers, American Screw Company (0.272-18, Machinists Handbook 1909)
@   16-16             American Screw Co.
W   16-10x2           wood screw type II #16, double-thread, FF-S-111D 1974
W   16-9              wood screw #16, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ANSI B18.6.1, larger less common size
@   0.2701-24         STI-#12-24, 6.86x1.06; screw thread insert thread, ASME B18.29.1
 t  0.275-40          on some 8mm collets for watchmaker lathes; Bergeon, Schaublin etc. drawbar
    0.275-32
H   0.275-20          Whitworth thread proposal, 1857
=====2 SWG            British Standard Wire Gauge, 0.276", 7.010mm
@   M7x0.2            DIN 13-2
@   M7x0.25           DIN 13-2
@   M7x0.35           DIN 13-2
!o  M7x0.35           lens mount, "M7" (1/8", 1/7", 1/6", 1/5", 1/4", 1/3.6", 1/3.2", 1/2.7", 4.85mm sensors), sports digital video, VR, security, doorbell cams, vehicle rear view mirrors, etc; eg. AR0330/IMX132/OV2640("espcam")/OV2643/OV4689/OV5653/OV7251/OV7675/OV7725/OV7740/OV9712/OV9732/PC7070K
====M7x0.5            ISO extended, DIN 13-3, DIN 519 (2st), GOST 9150-59 constant, GOST 24705-81
 o  M7x0.5            lens mount (1/3" sensors), less comon than M7x0.35
    M7x0.5            bulkhead nut, through-bulkhead hose couplers/adapters
 %  M7x0.5            sleeve nuts for olives for some pressurized air hose attachments; see also M8x1
!   M7x0.5            e-cig/vape, 510 thread, female on battery, male on atomizer; 10 threads, 5mm long; most common by far
    M7x0.5            e-cig/vape, 401 thread, male on battery, female on atomizer; also 402, 403 - same diameter, different length, also M401,M402,M403male on battery, female on atomizer
    M7x0.5            microwave tuning elements
=== M7x0.75           ISO 261 2nd, ISO tertiary fine, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, JIS B 0211, DIN fine, French automobile (Pas Fin), SI M.MB, ISA B (1940), SI fine (1971), DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 t  M7x0.75           chuck mount thread, slightly smaller
 t  M7x0.75           on some adjustable reamers (Beck)
 C  M7x0.75           on round connectors, "M5", business-end, external; also M5x0.5 on internal
    M7x0.75           bulkhead switch/button nut thread
    M7x0.75           potentiometer, dia 17mm back, dia 6.0mm shaft, option. with 18/22/24 teeth (also 13mm back)
    M7x0.75           on push-fit tube couplers, R26 cartridge slots for 3..3.17mm dia
    M7x0.75           fountain pens, Richard Greenwald click transmission
T   M7x0.75           present in GEKO G38300 thread cutting set
H   7x1.0             PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   7x1               Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   7x1               S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   7x1               SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   7.00x1.00         French metric aircraft threads, from US Bureau of Standards LC18 1923
=== M7(x1)            M7, "4th choice/avoid"; ISO 261 2nd, ISO tertiary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, JIS B 0209, MJ, DIN coarse, French automobile (Pas Normal), "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.21M aerospace, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M7                hex head wrench size: 11 (JIS)
    M7x1              cold end of heatblock in some E3D heads for FDM 3d printers, nozzle for E3D v10
    M7x1              on bicycles, bottom bracket; crank key; some handlebar binder bolts; nuts, seat screws, Brooks adapter, cones, locknuts for pedal axle
    M7                low-cost car roof antennas, male on antenna; also converters to M6
    M7                on cars; standard "small screw" on Citroen cars from era of 2CV, DS, etc., some Peugeot cars, clutch on MK2 Vauxhall Cavalier; Japanese bicycles
    M7                on lamps; common plastic strain-relief set screw to hold cable
 p  M7(x1)            on packaging tubes; "M7"; on small tubes, eg. meds, cosmetics, paints; 13.5mm-dia aluminium tubes
T   M7x1              present in AUTO-1, GEKO G38300 thread cutting set
H   Lh7x1.1           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   7x1.1 VDI         VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
====M7x1.25           "ISO-other", "metric special"
    M7x1.25           on some vehicle engines; Skoda hydraulic clutch bearing, some gearboxes; threads in cast aluminium
    M7x1.25           some screw-in door hinges, for PVC doors
 p  M7x1.25           on packaging tubes; much less common than M7, on small tubes
H   7x1.25            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   7x1.5             PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
M   HB 7              7x?, medical implants, bone screws, deep thread, unusual dia; cancellous bone screw, cannulated; asym thread 25/5° rounded
W   7.0x2.4           confirmat screw, fine thread, #16-~10.5
W   7.0x2.6           confirmat screw, standard deep thread, #16-~9.8
W   7.0x3.0           confirmat screw, chipboard thread, #16-~8.5
s   7x3.1             threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
W   7x3.2             wood screws, DIN
@   0.280-36 UNS
=====1 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 9/32", 0.28125", 7.144mm
@   9/32-48
@   9/32-40 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   9/32-40 UNS
!t  9/32-40           chuck mount thread, common, Dremel chuck/collet nut thread, 7.14mm
    9/32-36           fountain pens, Pelikan 200/400/600 Nibs and feeds as well as Esterbrook and Reform; Pelikan M150 to M600 nib units
@   9/32-32 ME        Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
@   9/32-32 NS
@   9/32SM28          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M7.14x0.907
    9/32SM28          sewing machines, Singer tap TE17
@   9/32-28 NS
    9/32-28           panel nuts
@   9/32-27
@   9/32(-26) BSB     British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
@   9/32-26 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   9/32-26 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   9/32(-26) BSF     British Standard Whitworth, fine, small; 55°; BS 84-1956 (secondary size, avoid if possible); in British Standards Interim Report 7270-1919
H   9/32-26 CEI       Original Cycle, British bicycles, 60°, historical
@   9/32-26 BSC       British Standard Cycle, CEI, bicycles; bolts and nuts, general use
H   9/32(-24) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; less common size
@   9/32-24 NS
 t  9/32-24 NS        on some Stanley/Record tools (planes), lever cap screw; also LH, brass adjusting nut
    9/32-24           adjustment screws on some orthopedic gear; also 5/16-24, 5/16-20, 1/4-28
@   9/32(-20) BSW     British Standard Whitworth, small; 55°; old standard
@   9/32-20 BSC       British Standard Cycle, bicycles, 60° (not in Guide to World Screw Threads)
@   9/32SM20          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M7.14x1.27
@   9/32-20
    9/32-18           sewing machines, Singer tap TE15 (can be 9/32SM20?)
=====#17 screw        wood/machine screw gage; 0.28156" 7.1516mm (American Screw Co. old standard)
@   17-20
@   17-18
@   17-16
W   17-9              wood screw #17, Machinists Handbook 1909 (AmerScrewCo diameter)
 %  0.286-36          on some gas plug orifices, nozzles
H   7.20x1.0367       Mechaniker thread no.14, 24.1/2 tpi, 58° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
=====2 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.284", 7.214mm
@   7.300x1           STI-M6x1, screw thread insert thread, DIN 8140-2
=====1 AWG            American Wire Gauge, Brown&Sharpe, 0.2893", 7.348mm; copper conductors, 42.4mm2, 0.4066mΩ/m, 110..145 amps (60/90°C)
H   0.29-25.71        Holtzapffel & Co. (1856), historical; 7.366x0.988; tap/die "J", comb-screw tool no.8, mandrel guide no.5
 t  M7.4x0.5          on Mitutoyo measurement dial-gauges
    M7.4x0.5          fountain pens, #6 nib and feed holder assembly, for the Jowo, Meister Nib
=====#18 screw        wood/machine screw gage; 0.29472" 7.4859mm (American Screw Co. old standard) or 0.294" 7.468mm (ASME)
@   18-20             ASME standard (1907, Machinists Handbook 1909), NS, American Screw Co., Sellers
@   18-18             ASME special, NS, American Screw Co., Sellers, American Screw Company (0.298-18, Machinists Handbook 1909)
    18-18             machine screw, listed in 1905 edition of Brook's Automobile Handbook
@   18-16             American Screw Co.
W   18-10x2           wood screw type II #18, double-thread, FF-S-111D 1974
W   18-8              wood screw #18, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ANSI B18.6.1, larger less common size
@   M7.5x0.2          DIN 13-2
@   M7.5x0.25         DIN 13-2
    M7.5x0.3          some dental equipment (Bien Air)
@   M7.5x0.35         DIN 13-2
 o  M7.5x0.35         lens mount, some small 1/9" 1/10" sensors, "M7"; eg. OV7675 VGA sensor
    M7.5x0.35         thumb screws on some arthroscopy instruments
@   M7.5x0.5          DIN 13-3, DIN 519 (avoid)
 o  M7.5x0.5          mounting bores for Thorlabs 7mm-dia optic mounts
 o  M7.5x0.5          lens mounting ring, for 7mm-dia lens mounts, eg. Thorlabs
    M7.5x0.5          some coaxial connectors, panel-mount thread, press-contacts on circuitboard; "compression coax"
    M7.5x0.5          fountain pens, common, Jowo size 6 nibs, Bock 250 nibs
 t  M7.5x0.5          on some dial indicators; on top of the digital 543 series Mitutoyo dial gauge
 t  M7.5x0.5          on some tooling collets; internal thread in shank of a mini-ER11 collet, ER DIN 6499
@   M7.5x0.75
 t  M7.5x0.75         on some adjustable reamers (Beck)
@   M7.5x1            DIN 13-5
@   M7.5x1.25
    M7.5x1.25         on some cars; tailgate strut for the High Roof L400 Delica
H   7.5x1.6           Armengaud thread, V-thread, 76° (later 55°), historical
s   7.5x1.8           self-tapping, for some cars
@   M7.5x2.4          concrete screw, masonry screw, 40+60° V; two-start?
@   M7.5x2.8          concrete screw, masonry screw, 40+60° V; two-start?
W   7.5x3.3           wood screws, M/M
@   0.2964-28         STI-1/4-28, 7.53x0.907; screw thread insert thread, ASME B18.29.1
=====1 SWG            British Standard Wire Gauge, 0.300", 7.620mm
=====1 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.300", 7.620mm
@o  0.30-48 Whitw.    7.62x0.529; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
 h  0.300-28          see also 0.400-28
H   0.300-18          Whitworth thread proposal, 1857 (replaces 5/16-18 from 1841 proposal)
=== G1/16(-28)        G7.723x0.907, W.304-28, W7.72x0.907, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT)
*   .302-32           ...see .305-32, 8V1 Schrader valve
====.305-32           8V1, Vg8, 7.68x0.794; originated in 1891 before thread size standardization (1844 August Schrader opens shop, 1893 Schrader valve patented, thread set up sometime in between)
@   8v1               tire valve, ISO 4570-1, 7.68x0.794 (32 tpi), also .305-32; Vg8, VO-07-5 (ETRTO std.1), 8V1-2 (ETRTO std.2)
@   Vg8               tire valve, DIN 7756, equal to 8v1
 g  0.305-32          car-bike tire valve 8V1, Schrader/AV/American external thread, most common cap size, 7.747x0.7938mm (8v1?); also Dunlop/DV/Woods/English bicycle tire valve
 g  8V1               "Schrader valve", on bicycle tires, external thread; see 5V1 (5.15x0.705, .209-36) for internal bore thread
 g  8V1               "Dunlop valve" (also called "English valve", "Woods valve"), on bicycle tires; external thread on stem
 g  8V1               large-bore OTR valves on tires, internal thread in stem; for external thread see 12V1; see also 12V1/9V1, 12V1/8V1, 17V2/13V1
 g  Vg8               fire extinguishers; pressure check gauge thread, female on valve
 g  0.305-32          car air conditioning refrigerant coupling, US EPA standard, R-414A/GHG-X4/HCFC Blend Xi/McCool Chill It, high side port
 g  0.305-32 LH       car air conditioning refrigerant coupling, US EPA standard, R-406A/GHG-12/GHG-X3/McCool, high side port
H   7.73x1.230        FS -2, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -2, 0.3043-20.7
    M7.8x0.8          fountain pens, Jr Gent 1 RB front section to body (was a note for M8x0.75 maybe?)
    M7.9x0.6          fountain pens, common, Bock size 6 nibs (larger "6mm Bock feeds"), Bock 250 feeds
@   7.900-32          CTV8-32, bicycle tire valve, Japanese CTV specification
*   Fg7.9-26          ...see at 5/16-26
*   .307-32           ...see .305-32, 8V1 Schrader valve
=====#19 screw        wood/machine screw gage; 0.30788" 7.8201mm (American Screw Co. old standard)
@   19-20
@   19-18
@   19-16
W   19-8              wood screw #19, Machinists Handbook 1909 (AmerScrewCo diameter)
 w  .310-30           old single-shot rifles for boys, takedown screw for Stevens Crackshot (can be 5/16-30?)
=====1/16" pipe       5/16" outer diameter
*   5/16" GAS         ...see 0.342-27
*   5/16 JIC          ...see 1/2-20; fittings/tubes, dash size -5, nominal inner dia 5/16"
=====0 USG            US standard gauge for sheet plate steel, 15 US Code sec.206, 5/16", 0.3125", 7.9375mm
===== 5/16 Cu tube    DN8, 7.94mm outer-diameter tube; AS 1432 wall thick 0.91mm/20g (A/green, 8.81 MPa), 0.71mm/22g (B/blue, 6.7MPa); AS/NZS 1571, wall thick 0.81mm (8.29 MPa), 0.91mm (9.43 MPa)
@   5/16-80
@   5/16-72
@   5/16-64
@   5/16-60 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   5/16-60
@   5/16-56
@   5/16-48 UNS       NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
@   5/16-40 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   5/16-40 WS        Whitworth Special
====5/16-40 MTP       Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT; less common than 5/16-27
 %  5/16-40           model live steam engine fittings
====5/16-40 UNS       NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
@   5/16-36 UNS       NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
@   5/16-32 ME        Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
=== 5/16(-32) UNEF    M7.938x0.794, primary size, 32UN, SAE extra fine (1915/1926), "series C" (TM 9-254, 1958), NS, UNJEF, USF, ANEF (H28 1944), NEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
 g  0.3125-32 UNEF    gas bottle valve thread, CGA 110 (USA/Canada), female on bottle; small cylinders, all gases
!%  5/16-32 UNEF      ball inflator air pump needles; for less common larger see 1/8-27 NPT
 %  5/16-32           some carburettor jets, alcohol fuel
 %  5/16-32           vintage Harley Davidson motorcycles; chassis, Zerk fitting, 1924-*
    5/16-32           some engine valve stems, "common uncommon thread"
    5/16-32 NEF       connector, 5.5mm power barrel jack, metal
    5/16-32 UNEF      connector, 2mm banana jack
    5/16-32 UNEF      some bushing EMC filters
    5/16-32           external threads on some 3/16-100 adjustment screw holders
@   5/16-30
====5/16-28 UN        28UN, 28-thread, primary size, constant pitch series, "28N", NS, UN (H28 1963)
 %  5/16-28           tube coupling, 1/8 ("-2"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars, truck, refrigeration
 %  5/16-28           lab equipment ports, syringe connections, chromatography instrument ports, Bubble-Free Prime (BFP), Microlab-specific; much less common than 1/4-28; see also M8x0.75
 %  5/16-28           adhesive dispenser attachments, uncommon
 w  5/16-28           firearms, barrel screw, Savage brand
*   5/16-27 GAS       ...see 0.342-27
====5/16-27 MTP       Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT; exactly equals 1/16 NPT
=== NPT 1/16(-27)     M7.95x0.941; IPS, NPS, NPSM, straight thread is identical to 5/16-27 UNS; 27-thread series, fine threads for thin-wall tubing; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928, H28 1944; not included in API Line Pipe series
    1/16 NPT          small pneumatic tubing ports (also M3, M5, 10-32, 1/8 NPT, G1/8)
====5/16-27 UNS       27-thread series, fine threads for thin-wall tubing; "27N", NS, NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D; piping, identical to straight variant of 1/16-27 NPT, or 1/16 IPS; 5/16 MTP (Model Taper Pipe)
 S  5/16-27 UNS       on lamps; hollow tube to lead the wires through, less common alternative to 1/8 IPS
 %  5/16-27           some small steam engine fittings
 %  5/16-27 UNS       on some gas plug orifices, nozzles
@   5/16(-26) BSB     British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   5/16-26 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   BC 5/16-26        BC5/16, 7.94x0.977, bicycle thread, front hub shaft; JIS B 0225
====5/16-26 BSC       British Standard Cycle, bicycles, 60°; bolts and nuts; compatible with M8x1 with "class B" fit; general use
    5/16-26 BSC       British bicycles, typical front axle and seat pin clamp bolt (some also 24-tpi), GB Stems handlebar clamp; also as LH
    5/16-26 BSC       on old (30's/40's) J.A.Prestwich JAP industrial engine, head studs
T   5/16-26 BSC       basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
T   5/16-26 BSC       assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
====Fg7.9(-26)        7.938x0.977, bicycle screw thread, 60°, DIN 79012
    FG7.9             on bicycles; 5/16-26, front axle, cones and nuts
@   5/16-26
*   5/16-24 STI       ...see 0.3666-24, 9.31x1.06 (screw thread insert)
H   5/16(-24) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; less common size
@   5/16-24 WS        Whitworth Special, Whitform
    5/16-24 BSC       British bicycles, some front axle and seat pin clamp bolt, 26 tpi more typical (not in Guide to World Screw Threads)
====8v2               tire valve, ISO 4570-3,  7.9x1.058 (24 tpi), 5/16-24
 g  5/16-24           car air conditioning refrigerant coupling, US EPA standard, R-414B/HCFC Blend Omicron/Hot Shot, small cans
 g  5/16-24 LH        car air conditioning refrigerant coupling, US EPA standard, SP34E, small cans
=== 5/16(-24) UNF     M7.938x1.058, primary size, screw "G" (US), ALAM automobile standard (Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), UNF (B1.1-1935, H28 1950/1957/1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    AN5               aircraft bolts, 5/16-24 UNF-3A; AN25, clevis bolt; AN75, drilled head; AN175, close tolerance; AN44, eye bolt (5/16 shank, 1/4 hole); AN45 eye bolt (5/16 shank, 5/16 hole); NAS1105/NAS6205 shear bolts
 %  5/16-24           "MTP", "Model Tapered Thread"
 %  5/16-24           "model pipe thread", model boiler/steam engine fittings; also 3/16-40, 1/4-40, 1/4-32
 %  5/16-24           tube coupling, 1/8" tube, standard compression fitting with ferrule, standard flare fitting
 %  5/16-24           tube coupling, 1/8 ("-2"), SAE 45-deg flare (SAE J512), flare male on male
 %  5/16-24 UNF       tube coupling, 1/8 ("-2"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  5/16-24           tube coupling, 1/8 ("-2"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  5/16-24           tube coupling, 1/8 ("-2"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  5/16-24           tube coupling, brake thread ("-3"), 3/16" tube, sleeve nuts on tubes; in truck air brakes; 3/16 tube not specified by SAE
 %  5/16-24 UNF       grease fitting nipples, "zerk", US; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 %  5/16-24 UNF       on some gas plug orifices, nozzles
 %  5/16-24 UNF       ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514; AS5202 (for UNJF)
 t  5/16-24 UNF       rotary power tools - orbital sanders, US standard, usuallly female on arbor; see also M6, M8
 t  5/16-24 UNF       rotary power tools - routers, US standard, male on arbor; see also 1/4-28
 t  5/16-24 UNF       chuck mount thread, drill chucks, less common than 3/8-24
    5/16-24 UNF       connector, 5.5mm power barrel jack
    5/16-24 UNF       some bushing EMC filters
    5/16-24           panel nuts
    5/16-24           architectural suspension systems, typ. for 3/64" 1.19mm cable
    5/16-24           archery, typical stabilizer and arrow rest mounting holes on bows; adapters to 1/4-20 exist
    5/16-24           on bicycles; front hubs, solid axle, less expensive bikes (UNF, BSF, or BSC?)
    5/16-24           adjustment screws on some orthopedic gear; also 9/32-24, 5/16-20, 1/4-28
    5/16-24           sewing machines, Singer tap TE63; alternative 5/16-24 UNF
@   5/16-22 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====5/16(-22) BSF     British Whitworth Fine-pitch; W7.937x1.155; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "G" (UK); also LH
 %  5/16-22 BSF       grease nipples
 %  5/16-22 BSF       grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
    5/16 BSF          on British "Seagull" outboard boat motors (1/4,5/16,3/8 BSF)
    5/16-22           on vintage 1880's Gormully & Jeffrey bicycle
T   5/16-22 BSF       basic BSF/BSW tap/die set for car work (1/4-26,20 5/16-22,18 3/8-20,16)
T   5/16-22 BSF       assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
@   5/16-22
@   5/16-20 BSC       British Standard Cycle, bicycles, 60° (not in Guide to World Screw Threads)
====5/16-20 UN        UNS, 20UN, 20-thread, primary size, constant pitch series, NS, UNJ, UN (H28 1963)
 %  5/16-20 UN        Swagelok fittings; series 200, 1/8" tubes; 2mm/3mm tubes
    5/16-20 UNS       in some antique/classic automobiles, pre-war Harley motorcycles, common pre-war size; also 1/4-24
    5/16-20           on Heinze coilbox studs, in Ford Model T(?)
 t  5/16-20           on some Stihl chainsaws, bar mount nut
    5/16-20           adjustment screws on some orthopedic gear; also 9/32-24, 5/16-24, 1/4-28
    5/16-20           sewing machines, Singer tap TW20131
*   5/16-18 STI       ...see 0.3847-18, 9.77x1.41 (screw thread insert)
H   5/16-18           Whitworth thread proposal, 1841 (replaced with 0.300-18 in 1857)
@   5/16-18 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====5/16(-18) BSW     British Standard Whitworth; W7.937x1.41; 55°; also "continental Whitworth"; 5/16W18 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 %  5/16-18 BSW       grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 t  5/16-18 BSW       on some Stanley/Record tools (Bailey planes), cap iron screw
    5/16 BSW          beer tap handles, ferrules for hanger bolts converting to 3/8 UNC
T   5/16-18 BSW       basic BSF/BSW tap/die set for car work (1/4-26,20 5/16-22,18 3/8-20,16)
T   5/16-18 BSW       assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
H   5/16-18           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   5/16-18           stove bolt series, "SB", manufacturer standard, USA
@   5/16-18 stove     stove bolt, sizes from Strelinger catalog of 1895; old and new standard (Machinists Handbook 1909); 60° Sellers-like with wider root/crest flats (1/4-18 flats equal 11 tpi, as by Machinery's Encyclopedia for 1917)
H   5/16-18           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   5/16SM18          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M7.94x1.41
    5/16SM18          sewing machines, Singer tap TE11; alternative 5/16-18 UNC
=== 5/16(-18) UNC     M7.938x1.41, primary size, UNJC, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), UNC (B1.1-1935, H28 1950/1957/1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
    5/16-18           common generic fastener, !!!do not mistake for M8x1.25
    5/16-18           "5/16 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    5/16-18           stove bolt, standard size (3/16-24, 1/4-18, 5/16-18, 3/8-16), as of 1933 "Standards and specifications for metals and metal products", maybe different root/crest flats?
 t  5/16-18           some mandrels for woodturning
    5/16-18           billiard/pool cue joining pin (also 5/16-14, 3/8-11, 3/8-10), common
    5/16-18           low-cost car roof antennas, male on antenna; also converters to M6
    5/16-18           thread insert, external thread; keylocking and EZ-Lok steel thinwall, 10-32, 10-24; keylocking heavy duty and EZ-Lok steel, 8-32; extra heavy duty, 6-32
s   5/16-18           self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   5/16-18           thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
@   5/16-16 UNS
    5/16-16           some carriage bolts, also 3/8-16; some thumb screws; much less common than 5/16-18 but existing
 h  5/16-16           pocket irons on a century-old Brunswick pool table
@   5/16-14           "14N"
    5/16-14           billiard/pool cue joining pin (also 5/16-18, 3/8-11, 3/8-10)
L   5/16-14 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G, general-purpose only; BS 1104:1957, class 2G,3G,4G,5G
s   5/16-14           self-tapping screws type HL, for plastic; double-lead, high and low, sharp thin threads
@   5/16-12
L   5/16-12 ACME
s   5/16-12           self-tapping screws type B, type AB, type 25; 8x2.1; coarse, sharp; ANSI B18.6.4
s   5/16-12           self-drilling, Tek screws (BSD), SAE J78-1998
L   5/16-10 square    leadscrew, on early Hardinge lathes
W   5/16-9.5          coach and lag screws (Machinists Handbook 1909)
s   5/16-9            self-tapping screws type A, obsolete
s   5/16-9            thread-rolling screws, Plastite style, uncommon
s   5/16-9            self-tapping screws, W.T. type A
W   5/16-9            lag screws, dowel screws
L   5/16-8            ballscrew, freewheeling, for leadscrews
*   8                 ...see 5/16  - rounding error
===== 8mm Cu tube     8mm outer-dia tube; ASTM B88M type A/0.9mm, B/0.8mm, C/0.6mm; EN 1057, wall th 0.6(X),0.8(Y),1.0mm, also PVC-cover soft; BS 2871, table X (wall th 0.6mm, 9.7 MPa), Y (0.8mm, 10.5 MPa), Z (0.5mm, 9.8 MPa); common "microbore" copper pipe in Europe
@   M8x0.2            DIN 13-2
@   M8x0.25           DIN 13-2
@   M8x0.3
 o  M8x0.3            lens mount, unusual size, JIIA image size class I, 2nd choice (maybe it is M8x0.5?); in machine vision
@   M8x0.35           DIN 13-2
 o  M8x0.35           lens mount (1/4", 1/3" sensors); scanners, HD cameras; less common than M8x0.5
=== M8x0.5            ISO extended, DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
!o  M8x0.5            lens mount (1/5", 1/4", 1/3" sensors; sometimes occurs in diode laser modules), second most common in small cams, aspheric lens housing; vehicle video recorders
 C  M8x0.5            panel nut, Hirose HR10A 4,5,6-pin connectors, some "M8" connectors, 4mm banana jacks
    M8x0.5            panel nuts and securing nuts on some RF connectors
    M8x0.5            fountain pens, cigar transmission
    M8x0.7            some odd locknuts? (aliexpress kit)
=== M8x0.75           ISO 261 1st, ISO primary fine, ISO 262 preferred, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 %  M8x0.75           some tubing systems, e.g. in plastic industry, DN 2.7 (also M5x0.5)
 %  M8x0.75           chromatography syringe termination, "AccuDil" (AD); see also 5/16-28 (Bubble Free Prime, BFP), 1/4-28 (ChemSeal, C)
!t  M8x0.75           chuck mount thread, common, Dremel-like chuck/collet nut thread
 t  M8x0.75           some tooling collets
 t  M8x0.75           on some adjustable reamers (Beck)
    M8x0.75           microwave tuning elements, common size; also M6x0.75
    M8x0.75           bulkhead switch/button nut thread, spanner  9.0mm
    M8x0.75           panel nut, on some 5mm-dia LED panel holders, 4mm plastic banana sockets
    M8x0.75           connector, 5.5mm power barrel jack, metal
    M8x0.75           potentiometer, dia 24mm back, dia 6.0mm shaft, option. with 18/22/24 teeth
 C  M8x0.75           on some fiber optic connectors; also M5.5x0.5
    M8x0.75           on some industrial sensors
    M8x0.75           e-cig/vape, 901 thread, male on battery, female on atomizer
    M8x0.75           e-cig/vape, 1xx thread, female on battery, male on atomizer
    M8x0.75           fountain pens, cigar nib threads, trim ring and final; new Jr Gent?
    M8x0.75           on bicycles; chainring bolt, fastening chainrings
    M8x0.75           RC model engines, glow engines, Fora/Profi/Zalp/Cyclon propnuts
 w  M8x0.75           firearm barrel end thread, Walter P22 (.22), M-P 22 (.22), Colt/Umarex 1911 A1 (.22), Colt Gold Trophy (.22)
T   M8x0.75           present in N3-II, GEKO G38300 thread cutting set
====M8x0.8            ISO extended
 %  M8x0.8            tubing connection, in some water/gas pressure test kits, rare
 %  M8x0.8            some car tire pressure sensors (Nissan), tire valves
H   8x1               Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   8x1               SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
=== M8x1              common; ISO 261 1st, ISO primary fine, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, MJ, electrical conduit EN 60423, DIN fine, French automobile (Pas Fin), "French metric" (Machinists Handbook 1909), SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-5, "French", GOST 9150-59 constant, GOST 24705-81
    M8                hex head wrench size: 13 (ANSI/ISO/DIN), 12 (JIS)
    M8                common general purpose size
 %  M8x1 keg          pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M8x1              tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M8x1              tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M8x1              tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M8x1              compression fitting, 4mm tube: metric Norgren/Enots, metric WADE, Ni-plated brass
 %  M8x1              hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  M8x1              banjo bolts, tube fittings
 %  M8x1              sleeve nuts for olives for some pressurized air hose attachments; see also M7x0.5
 %  M8x1              piping and nozzles of central lubrication
 %  M8x1              grease fitting nipples, "zerk", metric; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M8x1              pipe attachment on bathroom sink faucets, female on tube
    M8x1              thermocouple ports on eg. gas stoves/furnaces/ovens (also M9x1, M10x1, 11/32-32, 7/16-28)
    M8x1              panel nut, connector, 5.5mm power barrel jack, plastic
!C  M8x1              "M8" circular connectors, "Minifast"; common thread on "aviation connectors" with sleeve nuts, eg. GX8, small ones; industrial for Profinet, Ethernet, sensors; some with M11x1, M10x1, M8x0.5 mounting thread
    M8x1              diesel engine glow plugs (also M9x1, M10x1, M10x1.25, M12x1.25)
    M8x1              thinner threaded-body industrial proximity sensors, eg. induction or photoelectric
 S  M8x1              base thread for lightbulb sockets (also M10x1, M13x1, M16x1); hollow tube for wires; on E14 (M28x2 outside) and E27 (M40x2) lightbulb holders
 S  M8x1              common architectural cable suspension coupler
    M8x1              on bicycles; square-type crank bolts, front solid axle hubs, suspension system hardware; front axle, cones and nuts
T   M8x1              present in AUTO-1, AUTO-2, M1-QS, M4-JS, N3-II, GEKO G38300 thread cutting set
H   Lh8x1.2           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   8x1.2 VDI         VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
*   M8x1.25 STI       ...see 9.624x1.25 (screw thread insert)
H   8x1.25            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   8x1.25            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   8.00x1.25         French metric aircraft threads, from US Bureau of Standards LC18 1923
H   M8x1.25           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
==  M8(x1.25)         M8, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ?, DIN coarse, French automobile (Pas Normal), "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "series E" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M8x1.25           common general purpose size, !!!do not mistake for 5/16-18
 %  M8x1.25           some piping systems, push-in quick couplers, fittings, lubrication, hydraulics
 %  M8x1.25           grease fitting nipples, "zerk", metric, common; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M8                some lab tubing systems, on multiport bottle caps
 %  M8x1.25           some cable glands
    M8                semiconductor packaging, stud-mounted diodes/SCRs; some DO-203AB, TO-208AC
    M8                electrical binding posts, 240/350A; terminal blocks, pitch 20mm (200A)
    M8                for smaller pipe holders/clamps (to 63mm), most common for ventillation pipes; also M10
 t  M8                rotary tools - backing pads, brushes, female on arbor, less common than M6, see also 5/16-24
 t  M8                on some tooling collets; internal thread in shank of a mini-ER16 collet (also M11x1), ER DIN 6499
 t  M8                common on paint brushes, squeegees, for handle attachment; male on brush, female on handle
    M8x1.25           favorite of Japanese motorcycle manufacturers, do not mistake for 5/16-18
    M8x1.25           pneumatic cylinder, MAL 20mm
    M8x1.25           on bicycles; stem hardware, stud type crank nuts, suspension hardware, saddle clamps, nuts, clamping spindle, clamping wedge for handlebars
    M8                on metric electric fence insulators (also M6)
    M8                straight hooks/screw eyes, 50kg; cup hooks, 40kg
    M8                geodetic tripod/pole pointy tips, male on tip
    M8x1.25           thread insert, external thread; keylocking thinwall, M5x0.8; EZ-Lok steel, 8-32, M4x0.7, M5x0.8; keylocking heavy duty, M4x0.7
 S  M8                tripod/monopod spikes and feet, male on spike, less common than 3/8-16; also 1/4-20, 5/8-11 (geodetic)
T   M8x1.25           present in GEKO G38300 thread cutting set
@   0.3150-20         STI-1/4-20, 8x1.27; screw thread insert thread, ASME B18.29.1
H   8x1.5             PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
====M8x1.5            Japanese JIS for M8 coarse?
 %  M8x1.5            some tube fittings in cars; Skoda Rapid/Superb/Yeti fuel pressure sensor
    M8x1.5            bolts in some Fiat cars
    M8x1.5            some oil pan plugs
s   M8x1.5            self-drilling construction screws
L   Tr8x1.5           trapezoidal fine, 30°, DIN 103; for leadscrews
s   8-16              8x1.59; thread-rolling screws, Plas-Fix, for plastic, 60° thread
====M8x1.75
s   8-14              glass/plastic bottle thread, SP-425; 8-425; tiny vials, chromatography vials standard size - 12x35mm 1.8mL, 12mm dia vials, small dropper bottles
    M8x2              lock threads for Fischer Minimax size 06 connectors
 p  8x2               German bottle closure thread series
 p  GL8(x2)           on glass containers, knuckle thread DIN 168; 60° internal, 30° external
L   Tr8x2             trapezoidal coarse, 30°, DIN 103; for leadscrews, unusual small
L   Tr8x2x4           "Tr8x8", trapezoid, for leadscrews, 4-start, 8mm/turn
 t  Tr8x2x4           common in 3d printers
=== ST8(x2.1)         self-tapping ISO #20; ISO 1478, EN 21478, DIN 7970; 60°
s   M8x2.1            self-tapping screws type B, type AB, type 25, metric variant of 5/16-12
s   8x2.12            self-tapping screws, DIN 7970
@   Tr8x2.5x2(like)   Luer Lock thread - trapezoid, two starts, 7.9..8.1mm outer, 6.6..6.8mm inner, 2.5..2.8mm pitch, top width 0.3..0.6mm, front over 30°, back 25..50°
s   8x2.5             M4 threaded insert, DIN 7965; 60°, lesser dia 5.5mm
@   Rd8(-10)          round/knuckle thread, DIN 405
s   8-9               8x2.82; self-tapping screws type A
W   8x3.3             wood screws, M/M
W   8x3.5             wood screws, DIN
s   8x3.5             threadforming screws, Remform II, for plastic; 30° asymmetric, round thread tip
@   8.100-30          CTV8-30, bicycle tire valve, Japanese CTV specification
=====#20 screw        wood/machine screw gage; 0.32104" 8.1544mm (American Screw Co. old standard) or 0.320" 8.128mm (ASME)
@   0.320(-26) BSB    W8.128x0.977; British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances, secondary size?
@   20-20             ASME standard (1907, Machinists Handbook 1909), NS (less common?), Sellers
@   20-18             ASME special, NS, American Screw Co., Sellers
@   20-16             ASME, NS, American Screw Co., Sellers, American Screw Company (0.325-16, Machinists Handbook 1909)
s   20-9              self-tapping screws type A
W   20-8              wood screw #20, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ANSI B18.6.1, larger less common size
=====0 SWG            British Standard Wire Gauge, 0.324", 8.230mm
=====0 AWG            1/0 AWG, American Wire Gauge, Brown&Sharpe, 0.3249", 8.251mm; copper conductors, 53.5mm2, 0.3224mΩ/m, 125..170 amps (60/90°C)
H   0.325-18          Whitworth thread proposal, 1857
H   8.28x0.9721       Mechaniker thread no.13, 26.4/31 tpi, 52° (size-specific); Siemens-Halske, German, in use until 1925, historical
    .328-24
H   0.33-25.71        Holtzapffel & Co. (1856), historical; 8.382x0.988; tap/die "I", comb-screw tool no.8, mandrel guide no.5
    M8.4x0.75         fountain pens, Heritance size 6 nibs (discontinued), large FP feeds
    M8.4x1            fountain pens, common nose cone/front section, front ends for Baron/Sedona/Navigator/etc (M8.5x1 also works); Panache? Jr Gent 2? may work for Sierra transmission threads
=====#21 screw        wood/machine screw gage; 0.33420" 8.4887mm (American Screw Co. old standard)
W   21-8              wood screw #21, Machinists Handbook 1909 (AmerScrewCo diameter)
@   M8.5x0.2          DIN 13-2
@   M8.5x0.25         DIN 13-2
@   M8.5x0.35         DIN 13-2
    M8.5x0.35         panel nuts for Fischer Minimax size 06 connectors; nut outer dia 10mm
@   M8.5x0.5          DIN 13-3, DIN 519 (avoid)
 o  M8.5x0.5          lens mounting ring, for 8mm-dia lens mounts, eg. Thorlabs
    M8.5x0.5          some fountain pens, nose cone threads, size 6 Ebonite nibs
    M8.5x0.75         fountain pens, Parker Duo fold and Heritance #6 feeds, some nose cone threads
@   M8.5x1            DIN 13-5
    M8.5x1            fountain pens, Bock intermediate section for size 5,6,8, for the Baron/Sedona Navigator style pens and the Sierra style transmission threads, Bock Quad assembly and sections
=====0 BWG            Birmingham Wire Gauge, Stubbs Gauge, 0.340", 8.636mm
@   0.342-27          gas (brass pipe) thread, size 5/16", 8.687x0.941; 27-thread series, fine threads for thin-wall tubing
H   8.75x1.4962       Mechaniker thread no.12, 16.368/377 tpi, 57° (size-specific); Siemens-Halske, German, in use until 1925, historical
=====#22 screw        wood/machine screw gage; 0.34736" 8.8229mm (American Screw Co. old standard) or 0.346" 8.788mm (ASME)
@   22-18             ASME standard (1907, Machinists Handbook 1909), NS, American Screw Co., Sellers
@   22-16             ASME special, NS, American Screw Co., Sellers, American Screw Company (0.350-16, Machinists Handbook 1909)
@   22-7              wood screw #22, Machinists Handbook 1909 (AmerScrewCo diameter)
=====00 USG           2/0 USG, US standard gauge for sheet plate steel, 15 US Code sec.206, 11/32", 0.34375", 8.731mm
 w  11/32-48          firearm barrel end thread, male on barrel; Smith and Wesson 422, 622 and 2206
@   11/32-40 UNS
@   11/32-36
    11/32-36          some fountain pens, found on Pelican fountain pens; Pelikan M800 nib units
====11/32-32 UNS      M8.73x0.794; NS
 %  11/32-32 UNS      gas nozzle; spud orifice ports on some grills, incl. Sunbeam and Weber; on some gas plug orifices, nozzles
    11/32-32 UNS      thermocouple ports on eg. gas stoves/furnaces/ovens (ASA) (also M8x1, M9x1, M10x1, 7/16-28)
    11/32-28          sewing machines, Singer tap TE60
 %  11/32-27          on some gas plug orifices, nozzles
@   11/32-20
    11/32-18          on Aermotor Windmill Company mills
H   8.77x1.370        FS -3, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -3, 0.3453-18.5
=====00 SWG           2/0 SWG, British Standard Wire Gauge, 0.348", 8.839mm
@o  0.35-36 Whitw.    8.89x0.706; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
H   0.350-18          Whitworth thread proposal, 1857
H   8.91x1.5804       Mechaniker thread no.10, 16 tpi, 1/14° (size-specific); Siemens-Halske, German, in use until 1925, historical
H   8.965x1.2192      Mechaniker thread no.11, 20 tpi, 5/6° (size-specific); Siemens-Halske, German, in use until 1925, historical; "Post-gewinde", used by postal service
@   M9x0.2            DIN 13-2
@   M9x0.25           DIN 13-2
@   M9x0.35           DIN 13-2
 o  M9x0.35           lens mount, eg. for OV2710/OV2718/OV5640
=== M9x0.5            ISO extended, DIN 13-3, DIN 519 (2st), GOST 9150-59 constant, GOST 24705-81
!o  M9x0.5            lens mount (most common for laser diode modules; 1/2.7", 1/3", 1/3.2" sensors), eg. AR0330/OV4689/OV9750/OV2710/IMX122/IMX322
 o  M9x0.5            lens mount; aspheric lens housing; on automobile video recorders and rear mirrors, scanners, cameras
 C  M9x0.5            panel nuts and "business end" securing threads on some RF and round "aircraft" "M9" connectors
    M9x0.5            panel nuts for some 6.3mm jack connectors
    M9x0.7            Petermann Carbide Guide Bush, Bechler Carbide Guide Bush
=== M9x0.75           ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 g  M9x0.75           LPG/propane/butane hose connection, female nut on hose, common; also on bottles, female on bottle, common on 2kg cylinders; see also G3/8
!   M9x0.75           connector, 1/4" 6.35mm jack, metal
    M9x0.75           potentiometer, dia 25mm back, dia 6.35mm shaft
    M9x0.75           panel nut, M11x0.75 SR30/PLT circular connectors
    M9x0.75           e-cig/vape, 801 thread, male on battery, female on atomizer
    M9x0.75           some thermocouple ports, less common than M9x1
    M9x0.75           fountain pens, common nose cone/front section; Wall Street II/Sierra RB nib section
 w  M9x0.75           firearm barrel end thread, .22 LR Sig Mosquito, Glock 44-1/2, SIG 1911-22, first generation ISSC M22
T   M9x0.75           present in GEKO G38300 thread cutting set
    M9-26             on bicycles; M9x0.977, hollow axle, front hub Campagnolo
H   9x1               SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
=== M9x1              ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, DIN fine, French automobile (Pas Fin), "French metric" (Machinists Handbook 1909), SI M.MB, ISA B (1940), SI fine (1971), DIN 13-5, "French", GOST 9150-59 constant, GOST 24705-81
 %  M9x1              some gas burner nozzles, gas pilot flames
    M9x1              connector, 1/4" 6.35mm jack
    M9x1              found on vehicle braking systems
    M9x1              thermocouple ports on eg. gas stoves/furnaces/ovens (also M8x1, M10x1, 11/32-32, 7/16-28)
    M9x1              diesel engine glow plugs (also M8x1, M10x1, M10x1.25, M12x1.25)
    M9x1              some bike axles
    M9x1              on bicycles; front hubs, quick release, Asian manufacturer; hollow axles, front axle BMX, cones and nuts
 p  M9x1              on packaging tubes; on superglue tubes
T   M9x1              present in N3-II, GEKO G38300 thread cutting set
@   M9x1.2            does it exist? French?
H   9x1.25            Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   9x1.25            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   9.00x1.25         French metric aircraft threads, from US Bureau of Standards LC18 1923
=== M9(x1.25)         M9, "4th choice/avoid"; ISO 261 3rd, ISO tertiary coarse, BS 3643-1:1981 3rd coarse, JIS B 0209, DIN coarse, French automobile (Pas Normal), "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), DIN 13-1, "series E" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
 %  M9x1.25           some tubing systems; brakes, for 4.5mm tube (Citroen)
    M9x1.25           on cars, some brake caliper fittings
    M9x1.25           on MIG welding torch assemblies, shroud+tip to handle, also on assembly M6x1 for tip, M11x1.5 for shroud (also M10x1.5)
 p  M9x1.25           on packaging tubes; "M9"; ordinary-size tubes, common; also superglue; on 19mm,22mm,25mm,28.6mm,31.75mm,32mm,38.1mm-dia aluminium tubes
T   M9x1.25           present in M4-JS, GEKO G38300 thread cutting set
H   Lh9x1.3           Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   9x1.3 VDI         VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
@   M9x1.5
 p  M9x1.5            on packaging tubes; uncommon
L   Tr9x1.5           trapezoidal fine, 30°, DIN 103; for leadscrews
H   9x1.5             Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
 p  SP9(-14)          9SP, glass/plastic bottle thread, 9-425, 9SP425; chromatography vials large-opening
 p  9x2               German bottle closure thread series; depth 0.68mm, crest radius 0.53mm, root radius 0.40mm
L   Tr9x2             trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size?
@   Rd9(-10)          round/knuckle thread, DIN 405
 p  S9x3.2            on packaging tubes; sawtooth thread; uncommon
W   9x4               wood screws, DIN
@   23/64-26 NS
=====#23 screw        wood/machine screw gage; 0.36062"? 9.1600mm (American Screw Co. old standard)
H   0.36-19.89        Holtzapffel & Co. (1856), historical; 9.144x1.28; tap/die "H", comb-screw tool no.6, mandrel guide no.4
W   23-7              wood screw #23, Machinists Handbook 1909 (AmerScrewCo diameter)
H   9.24x1.2543       Mechaniker thread no.9, 20.1/4 tpi, 55° (size-specific); Siemens-Halske, German, in use until 1925, historical
=====00 AWG           2/0 AWG, American Wire Gauge, Brown&Sharpe, 0.3648", 9.266mm; copper conductors, 67.4mm2, 0.2557mΩ/m, 145..195 amps (60/90°C)
@   0.3666-24         STI-5/16-24, 9.31x1.06; screw thread insert thread, ASME B18.29.1
@   0.368-26
 g  0.368-26          car air conditioning refrigerant coupling, US EPA standard, R-414A/GHG-X4/HCFC Blend Xi/McCool Chill It, low side port, 30-lb cylinders
 g  0.368-26 LH       car air conditioning refrigerant coupling, US EPA standard, R-406A/GHG-12/GHG-X3/McCool, low side port, 30-lb cylinders
    M9.4x0.5          some fountain pens, front of the piston filler
====9v1               tire valve, ISO 4570-2,  9.4x0.794 (32 tpi)
 g  9V1               air-liquid valves on tractor tires, internal thread in stem; for external thread see 12V1; some 8V1/5V1 tractor tire valve mounting bases; see also 8V1/5V1, 12V1/8V1, 17V2/13V1
H   9.40x1.1545       Mechaniker thread no.8, 22 tpi, 52° (size-specific); Siemens-Halske, German, in use until 1925, historical
=====000 SWG          3/0 SWG, British Standard Wire Gauge, 0.372", 9.449mm
=====#24 screw        wood/machine screw gage; 0.37368" 9.4915mm (American Screw Co. old standard) or 0.372" 9.449mm (ASME)
@   24-18             ASME standard (newer than 1907?), NS, American Screw Co., Sellers
@   24-16             ASME standard (1907, Machinists Handbook 1909) (or special?), NS, American Screw Co., Sellers, American Screw Company (0.378-16, Machinists Handbook 1909)
@   24-14             American Screw Co.
s   24-9              self-tapping screws type A
W   24-7              wood screw #24, Machinists Handbook 1909 (AmerScrewCo diameter), NSTC 1924/1928 (American National wood screw), ANSI B18.6.1, larger less common size
@g  .373-24 NGO       gas bottle valve thread, .373-24 M9.474x1.06 male, .375-24 3/8-24 M9.525x1.06 female; valve outlet #120
*   9.5               ...see 3/8   - rounding error
*   Fg9.5             ...see at 3/8-26
@   M9.5x0.2          DIN 13-2
@   M9.5x0.25         DIN 13-2
@   M9.5x0.35         DIN 13-2
@   M9.5x0.5          DIN 13-3, DIN 519 (avoid)
 o  M9.5x0.5          lens mounting ring, for 9mm-dia lens mounts, eg. Thorlabs
    M9.5x0.5          some fountain pens, size 8 Jowo nibs, Bock 380 nibs
 t  M9.5x0.5          screws/clamp nuts on some micrometer heads mounting stems, common; 0.375" stems
====M9.5x0.75         DIN 13-4
 o  M9.5x0.75         some lens mounting rings, eg. in laser optics
    M9.5x0.75         on push-fit tube couplers, R26 cartridge slots for 4mm dia
*   Fg9.5-26          ...see at 3/8-26
@   M9.5x1            DIN 13-5
 t  M9.5x1            on some adjustable reamers (Beck)
 w  M9.5x1            on some target rifle sights, metricated variant of older 3/8-24; on some German guns (Anschutz?)
=== ST9.5(x2.1)       self-tapping ISO #24; ISO 1478, EN 21478, DIN 7970 (diameter not in DIN?); 60°
s   M9.5x2.1          self-tapping screws type B, type AB, type 25, metric variant of 3/8-12
W   9.5x3.8           wood screws, M/M
*   3/8" GAS          ...see 0.39-27
*   3/8" copper       ...see 0.514-20, W13.05x1.27
*   3/8" BSP          ...see G3/8-19, W 21/32-19 W16.67x1.34
*   3/8" NPT          ...see ~11/16-18, M17.145x1.81
*   3/8 JIC           ...see 9/16-18; fittings/tubes, dash size -6, nominal inner dia 3/8"
===== 1/4" Cu pipe    1/4" mm 6.35mm nominal bore, 3/8" outer diameter pipe; ASTM B88 type K/0.035"/0.889mm, L/0.030"/0.762mm; plumbing copper pipe in USA/Canada
===== 3/8" Cu tube    DN10, 9.52mm outer-diameter tube; AS 1432 wall thick 1.02mm/19g (A/green, 8.35 MPa), 0.91mm/20g (B/blue, 7.22MPa), 0.71mm/22g (C/red, 5.52 MPa); AS/NZS 1571, wall thick 0.71mm (5.90 MPa), 0.81mm (6.80 MPa), 0.91mm (7.72 MPa)
    3/8-100           some fine adjustment screws, common-ish
@   3/8-80
@   3/8-72
@   3/8-64 NS
@   3/8-60 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   3/8-60
@   3/8-56
@   3/8-48 UNS
@   3/8-40 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   3/8-40 WS         Whitworth Special
====3/8-40 MTP        Model Taper Pipe; METP (British equivalent); US standard for model steam engines, 60°, 1:16 taper, scaled form of NPT, less common size
====3/8-40 UNS        NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
    3/8-40 UNS        bulkhead nut, on some housings of 1/4 adjustment screws
    3/8-40 UNS        Coleman cap orifice 402, some other oil and propane burner nozzles
    3/8-40 UNS        on some high-precision gage heads
@   3/8-36 UNS        NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
    3/8-36            found on Pelican fountain pens; Pelikan M1000 nib units
@   3/8-32 ME         Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
=== 3/8(-32) UNEF     M9.525x0.794, primary size, 32UN, SAE extra fine (1915/1926), UNJEF, ANEF (H28 1944), NEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
 %  6/16-32 UNEF      on some gas plug orifices, nozzles
!C  3/8-32 UNEF       F coax connectors
!   3/8-32 UNEF       TNC,BNC connectors bulkhead mount thread (TNC own thread 7/16-28 UNEF)
    3/8-32 UNEF       connector, 1/4" 6.35mm jack, metal
    3/8-32 NEF        panel nut, potentiometer, dia 23mm back, dia 6.32mm shaft (0.91", 0.249"), also dia 6.0mm shaft opt. with 24 teeth; some switches, circuitbreakers (also 3/8-27)
@   3/8-30 NS
====3/8-28 UN         28UN, 28-thread, primary size, constant pitch series, "28N", NS, UN (H28 1963)
@   3/8SM28           German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M9.53x0.907; like to 3/8-28 UN
====3/8-27 UNS        NS; 27-thread series, fine threads for thin-wall tubing; "27N", NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  3/8-27 UNS        on some gas plug orifices, nozzles
    3/8-27            some carburetor seats
    3/8-27            panel nut, on some circuit breakers and switches; also 7/16-28, 15/32-32
*   3/8-27 GAS        ...see 0.39-27
@   3/8(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   3/8-26 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
H   3/8-26 CEI        Original Cycle, British bicycles, 60°, historical
====3/8-26 BSC        British Standard Cycle, CEI, bicycles; also as LH; bolts and nuts
    3/8-26 BSC        British bicycles, typically found on rear axle
    3/8-26 BSC        Triumph Norton 1959-1968
    3/8-26            on bicycles; solid rear axle
T   3/8-26 BSC        basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
T   3/8-26 BSC        assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
@   BC 3/8-26         BC3/8, 9.53xx0.977, bicycle thread, general use, rear hub shaft; JIS B 0225
====Fg9.5(-26)        9.525x0.977, bicycle screw thread, 60°, DIN 79012
    FG9.5             on bicycles; cones and nuts, BMX
    3/8-26            on bicycles; rear axle
@   3/8-26 NS
 w  3/8-26            sights on old target rifles; metricated to M9.5x1
*   3/8-24 STI        ...see 0.4291-24, 10.9x1.06 (screw thread insert)
H   3/8(-24) ADMF     Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 9.525x1.058
@   3/8-24 WS         Whitworth Special, Whitform
=== 3/8(-24) UNF      M9.525x1.058, primary size, screw "J" (US), ALAM automobile standard (Machinists Handbook 1909), SAE standard, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF (B1.1-1935), UNF (H28 1950/1957/1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    AN6               aircraft bolts, 3/8-24 UNF-3A; AN26, clevis bolt; AN76, drilled head; AN176, close tolerance, less common; AN46, eye bolt (3/8 shank, 3/8 hole); NAS1106/NAS6206 shear bolts
    AN76              small aircraft propeller bolts, drilled head, if hard to find use AN6H-45A
 %  3AN               3/8-24 fitting thread, usually with 37-deg flare; common on aviation and racing car fuel systems, some brakes (piston outlet)
 %  3/8-24            tube coupling, 3/16" tube, standard compression fitting with ferrule, standard flare fitting
 %  3/8-24            tube coupling, 3/16 ("-3"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  3/8-24            tube coupling, 3/16 ("-3"), SAE 45-deg flare (SAE J512), flare male on male
 %  3/8-24 UNF        tube coupling, 3/16 ("-3"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  3/8-24            tube coupling, 3/16 ("-3"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  3/8-24            tube coupling, 3/16 ("-3"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  3/8-24            JIC tube fittings, for 3/16 tube
 g  .375-24 NGO       gas bottle valve thread, .373-24 M9.474x1.06 male, .375-24 M9.525x1.06 female; valve outlet #120
 g  3/8-24 UNF        gas bottle valve thread, CGA 020 (USA/Canada), male on bottle; oxygen, "A fitting", "A" nut, "size A" welding hoses (light duty and crafts), up to 200 psig; H28 1942/1944 ("Class A")
 g  3/8-24 UNF LH     gas bottle valve thread, CGA 021 (USA/Canada), male on bottle; fuel gases, "A fitting", "A" nut, "size A" welding hoses (light duty and crafts), up to 200 psig; H28 1942/1944 ("Class A")
 g  6/16-24           car air conditioning refrigerant coupling, US EPA standard, CFC-12, low-side port; Freeze 12, small cans
 g  6/16-24 LH        car air conditioning refrigerant coupling, US EPA standard, FreeZone/HCFC blend Delta, small cans; R-414A/GHG-X4/HCFC Blend Xi/McCool Chill It, high side port
 g  3/8 UNF           SCUBA diving regulators, most low-pressure ports
 g  3/8-24 UNF        SCUBA diving regulators, first stage output, female on regulator (hose to 9/16-18 second stage input); some also 1/2-20 UNF
 g  3/8-24 UNF        SCUBA diving suit inflators
 g  3/8-24 UNF        CO2 (gold nut)/N2O (silver nut) cartridges, refillable, male on cartridge, small, for soda/cream, tire inflators, gas guns (8/16/...~40g); aquarium disposable cylinders, 16g
 g  3/8-24 UNF        small gas canisters, 7g CO2, MIL-C 601, inflators, SF6 refills (9grams); 16g CO2 (for 5-liter beer kegs), 38g CO2 Leland Tactical Flotation Support System (TFSS)
 %  3/8-24 UNF        ports in scientific apparatus vessels; according to: SAEJ1926, SAEJ514; AS5202 6M152, AS1300, AS4201, PS10035(for UNJF)
 %  3/8-24 UNF        waterjet sapphire nozzle inserts (4200 bar)
 %  3/8-24 UNF        found on vehicle braking systems, brake master cylinder thread, SAE, very common, can be mismatched with M10x1
 %  3/8-24 UNF        grease fitting nipples, "zerk", US; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
    3/8-24 UNF        antenna mounts, female on post, male on antenna, VHF or CB, on vehicles
 C  3/8-24 UNF        mini-UHF connector thread
    3/8-24            spark plug thread
    3/8-24 UNF        car wheel nuts; classic mini
    3/8-24            vintage Harley Davidson motorcycles; motor, base stud nut, 1929-85 "45"/"K"/"XL"
    3/8-24            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
    3/8-24            on bicycles; some solid axle bike, including coaster brake
    3/8-24            panel nuts
    3/8-24            thumb screws on some arthroscopy instruments (also M6.5x0.5, M7.5x0.35)
    3/8-24 UNF-2A     semiconductor packaging, stud-mounted diodes/SCRs; typ. DO8, DO-205AA; metric is M12; also TO-63
!t  3/8-24 UNF        chuck mount thread, drill chucks, 1/4" adapters on ebay
 t  3/8-24 UNF        rotary power tools - US standard, small angle grinders; M10 alternative; see also 3/8-16 UNC, 5/8-11 UNC
 t  3/8-24            threaded shanks of reamers, countersinks (also 10-32, 1/4-28, 7/16-24)
 w  3/8-24 UNJF-3A    output thread on NASA standard pyrotechnic initiator and compatibles
 w  3/8-24            firearm barrel end thread, Kel-Tec PMR-30 (.22 cal)
*   3/8-20 copper     ...see 0.514-20, W13.05x1.27
@   3/8-20 TWF        Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====3/8(-20) BSF      British Whitworth Fine-pitch; W9.525x1.27; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "J" (UK); also LH
!S  3/8-20 BSF        thread on fishing rod holders and fishing equipment, "M" size, misnamed as "M3/8"; "fisher thread"
 %  3/8-20 BSF        found on vehicle braking systems
 %  3/8-20 BSF        grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
    3/8 BSF           on British "Seagull" outboard boat motors (1/4,5/16,3/8 BSF)
T   3/8-20 BSF        basic BSF/BSW tap/die set for car work (1/4-26,20 5/16-22,18 3/8-20,16)
T   3/8-20 BSF        assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
@   3/8-20 BSC        British Standard Cycle, bicycles, 60° (not in Guide to World Screw Threads)
====3/8-20 UN         20UN, 20-thread, primary size, constant pitch series, NS, UN (H28 1963)
 %  3/8-20 UN         Swagelok fittings; series 300, 3/16" tubes; 4mm tubes, 1/8" tubes
    3/8-20            M9.52x1.27; on self-tapping threaded inserts for 1/4-20 and M6
    3/8-20            vintage Harley Davidson motorcycles; chassis, star hub wheel lug, 1936-72; Harley Davidson front/rear brake drum
L   3/8-20 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
*   3/8-19 BSP        ...see G3/8, W 21/32-19 W16.67x1.34
 %  3/8-19            tube coupling, JIS 300, 3/8 ("-6"), tapered, or 30-deg male flare on male
*   3/8-18 NPT        ...see ~11/16-18, M17.145x1.81
H   3/8-18            stove bolt series, "SB", manufacturer standard, USA; old standard (Machinists Handbook 1909)
====3/8-18 UNS        Sellers, UNS (H28 1963)
*   3/8-16 STI        ...see 0.4562-16, 11.6x1.59 (screw thread insert)
H   0.375-16          Whitworth thread proposal, 1857 (replaces 3/8-16 designation from 1841)
@   3/8-16 TWC        Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====3/8(-16) BSW      British Standard Whitworth; W9.525x1.588; 55°; also "continental Whitworth"; 3/8W16 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 %  3/8-16 BSW        grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 S  3/8 BSW           stage equipment, some microphone stands (cf. 3/8-16 UNC); also 1/4 BSW
 S  3/8 BSW           on lamps, stage lighting suspension bolts, for lighter luminaires (eg. Australia); also 1/2 BSW
T   3/8-16 BSW        basic BSF/BSW tap/die set for car work (1/4-26,20 5/16-22,18 3/8-20,16)
T   3/8-16 BSW        assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
H   3/8-16            stove bolt series, "SB", manufacturer standard, USA
@   3/8-16 stove      stove bolt, sizes from Strelinger catalog of 1895; new standard (Machinists Handbook 1909); 60° Sellers-like with wider root/crest flats (1/4-18 flats equal 11 tpi, as by Machinery's Encyclopedia for 1917)
H   3/8-16            sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   3/8-16            Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
==  3/8(-16) UNC      M9.525x1.59, primary size, 16UN, UNJC, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
c   3/8-16 UN         UNC standard; 16UN, 16-thread, constant pitch series; originally for adjusting collars, retaining nuts
!S  3/8-16 UNC-1A     tripod large, M9.52x1.5875, DIN 4503, ISO 1222, PH3.7; most medium and all large format cameras, between tripods and tripod heads; max.0.05" counterbore, min.0.212"/5.4mm threaded-part hole depth; see also 1/4-20, 5/8-11, 5/8-27; some tripod heads with females
!S  3/8-16            European standard microphone holder thread (see also 5/8-27)
 S  3/8-16 UNC        photography lighting stands, de-facto standard (also 5/8" stud ("baby"), a nonthreaded rod clamped to a holder ("receiver"); rarely also 1/2", 11/16", 1.1/8" studs/receivers ("junior"))
 S  3/8 UNC           tripod/monopod spikes and feet, male on spike, standard; also 1/4-20
 S  3/8-16            some architectural cable suspension couplers
 t  3/8-16 UNC        rotary power tools - US standard, small angle grinders, wire brushes; M10 alternative; see also 3/8-24 UNF, 5/8-11 UNC, M10x1.25, M10x1.5
 t  3/8-16            collet chuck drawbar end on straight-shank ER11/ER16/ER20/ER25, Morse-taper MT2 ER20/ER25
    3/8-16 NC         electrical feedthrough centerwires
    3/8-16 UNC        beer tap handles, USA (also 5/16 BSW for UK)
    3/8-16            on billiard/pool cues
    3/8-16            furniture, USA (also 1/4-20)
    3/8-16            "3/8 stove bolt", loose-fit tolerance, UNC-1A; American National standard
    3/8-16            stove bolt, standard size (3/16-24, 1/4-18, 5/16-18, 3/8-16), as of 1933 "Standards and specifications for metals and metal products", maybe different root/crest flats?
    3/8-16            vintage Harley Davidson motorcycles; motor, head nut, 1929-39 45, some later "G"/ironheads; base stud, case, 1929-85 "45"/"K"/"XL"
    3/8-16            on cars, standard bumper bolts (3/8-16, 7/16-14, 1/2-13)
    3/8-16            sewing machines, Singer tap TE236, alternative 3/8-16 UNC
    3/8-16            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
    3/8-16            thread insert, external thread; keylocking and EZ-Lok steel thinwall, 1/4-28, 1/4-20; keylocking heavy duty and EZ-Lok steel, 10-32, 10-24; EZ-Lok steel, M6x1
 w  3/8               WW1 US MkI grenade (8x4 segments) filling hole
 w  3/8-16 UNC        accessory thread on some tactical grenades, for attachment of eg. clamps, eyes, bolts, magnets
s   3/8-16            self-tapping screws type F, type 23, type 1; ANSI B18.6.4
s   3/8-16            thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
L   3/8-16 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   3/8-14            "14N"
L   3/8-12 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944)
s   3/8-12            self-tapping screws type B, type AB, type 25; 9.5x2.1; coarse, sharp; ANSI B18.6.4
s   3/8-12            self-drilling, Tek screws (BSD), SAE J78-1998
    3/8-11.5          on some billiard/pool cue joining pins, nonstandard?
    3/8-11            billiard/pool cue joining pin; also 5/16-14, 5/16-18, 3/8-10; uncommon?
@   3/8-10
    3/8-10            billiard/pool cue joining pin; also 5/16-14, 5/16-18; most common standard
L   3/8-10 ACME       leadscrew, US class 2G/3G/4G, general-purpose only; BS 1104:1957, class 2G/3G/4G/5G
    3/8-10 ACME       leadscrew, on Myford lathes
L   3/8-10 square     leadscrew, on early Hardinge lathes
@   3/8-9             wooden thread, German cutting tools; diameter similar to 10mm
s   3/8-9             self-tapping screws type A, obsolete
L   3/8-8 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon; can be stub-thread
L   3/8-8             ballscrew, for leadscrews
s   3/8-7             self-tapping screws, W.T. type A
W   3/8-7             coach and lag screws (Machinists Handbook 1909, modern), dowel screws
====10v1              tire valve, ISO 4570-3,  9.6x1.0 (25.4 tpi); Vg9.6, VO-09-3 (ETRTO std.1), 10V1-1 (ETRTO std.2)
 g  Vg9.6             tire valve, DIN 7756, equal to 10v1
@   9.624x1.25        STI-M8x1.25, screw thread insert thread, DIN 8140-2
=====00 BWG           2/0 BWG, Birmingham Wire Gauge, Stubbs Gauge, 0.380", 9.652mm
@   1/8-28 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
==  G1/8(-28)         G9.728x0.907, W.3825-28, W9.728x0.907, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 g  G1/8              small pneumatic tubing ports (also M3, M5, 10-32, 1/16 NPT, 1/8 NPT)
 g  1/8-28 British    air valves, used in air conditioning systems
 %  G1/8-28           fire extinguishers, outlet thread, female on valve, small 1-2kg ones, less common than M14x1.5
 %  G1/8-28           fire extinguishers, dip tube, female on valve; uncommon
 %  G1/8              on flareless tube fittings, for 4 mm tube
 %  G1/8              compression fitting, 1/8" tube, 3/16" tube: imperial WADE
 %  G1/8              hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  G1/8              hydraulic test points, construction vehicles, Caterpillar, Kawasaki
 %  R1/8              car engine sensor port, oil pressure; Daihatsu, Honda, Mazda, Mitsubishi, Nissan, Subaru, Suzuki, Toyota
 %  G1/8              grease fitting nipples, "zerk", British; parallel; common; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 %  R1/8              grease fitting nipples, "zerk", British; tapered; common; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 w  G1/8              on some pyrotechnic gas generators (M16x1.5, G1/8, G1/4, G3/8; M11x1; 3/8-24)
T   1/8-28 BSP        assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
@   0.3847-18         STI-5/16-18, 9.77x1.41; screw thread insert thread, ASME B18.29.1
=====#25 screw        wood/machine screw gage; 0.38684" 9.8257mm (American Screw Co. old standard)
W   25-7              wood screw #25, Machinists Handbook 1909 (AmerScrewCo diameter)
@   0.389(-20)        BS copper pipe thread, BScopper, 1/4" inner dia; W9.88x1.27
=====3/8" pipe?
@   0.39-27           gas (brass pipe) thread, size 3/8", 9.906x0.941; 27-thread series, fine threads for thin-wall tubing
=== 0.390-27 UNS      M9.906x0.941, 1/8 IPS, 1/8-27 NPS equivalent to 1/8-27 NPT; 27-thread series, fine threads for thin-wall tubing; UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  1/8-27 NPS        fire extinguishers, dip tube on CO2 ones, uncommon (see M10x1 for standard), female on valve
 S  1/8 IPS           on lamps; most common for table lamps and lamp sockets, on socket base; hollow tube to lead the wires through; 1/4 IPS used where more strength needed
====.391-32 UNS       ABMA #00 locknut, N-00, M9.931x0.794, 25/64-32
@   25/64-27 USF      USF, old thread with special applications; 27-thread series, fine threads for thin-wall tubing
 %  25/64-27 UNF      some tubing systems, eg. oil pressure port on 1976 MG Midget Mk.IV car
 %  25/64-27          some grease cups in old cars (Front Fork Rocker Grease Cup Excelsior 1920-24)
    25/64-27          on some historical light fixtures, rare
H   9.95x1.520        FS -4, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -4, 0.3917-16.7
===== 10mm Cu tube    10mm outer-dia tube; ASTM B88M type A/0.9mm, B/0.8mm, C/0.6mm; EN 1057, wall th 0.6(X),0.7,0.8(Y),1.0mm, also PVC-coat soft; BS 2871, table X (wall th 0.6mm, 7.7 MPa), Y (0.8mm, 8.2 MPa), Z (0.5mm, 7.8 MPa); common "microbore" copper pipe in Europe
@   M10x0.2           DIN 13-2
@   M10x0.25          DIN 13-2
    M10x0.25          lens mount; Nikon M10x0.25 Objective Lens; Bleeker Zeist Holland M10x0.25 Microscope Objective Lens
@   M10x0.35          DIN 13-2
 o  M10x0.35          lens mount, for 1/1.8" sensors, uncommon
=== M10x0.5           ISO extended, DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
 o  M10x0.5           lens mount (1/4", 1/3" sensors), third most common after M12x0.5 and M8x0.5, aspheric lens housing; on car ADAS video recording systems, sports digital video
    M10x0.5           panel nuts, on some precision M6 adjustment screws, less common alternative to M10x1
    M10x0.5           fountain pens, common section threads
 w  M10x0.6           firearm barrel end thread, female on barrel; on Walther PP Sport, Manurhin PP Sport pistols (.22 LR)
    M10x0.6           on some high-accuracy touch sensors
    M10x0.6           Tornos M20 Guide Bush
=== M10x0.75          common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), ANSI/ASME B1.13M fine, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
    M10x0.75          bulkhead switch/button nut thread
 C  M10x0.75          panel nuts, PC4-type circular connectors, RS4 connectors panel+sleeve nut
    M10x0.75          panel nut, on some pneumatic/hydraulic panel-mount valves
    M10x0.75          panel nut, potentiometer, dia 21mm back, dia 6.0mm shaft (also 17mm back)
 t  M10x0.75          ERM8 mini collet nut
    M10x0.75          fountain pens, common nose cone/front section, common cap thread, common section thread; El Grande, Churchill cap receiver/holder; Jr Statesman"; Pelikan FP nib unit (200/250 14K/400 14K nibs)
    M10x0.75          bearing retaining locknut, "KM0", ISO 2982 (1971)
 t  M10x0.75          some tooling collets
T   M10x0.75          present in N3-II, GEKO G38300 thread cutting set
    M10x0.75x3        fountain pens, triple-lead, common cap thread
    M10x0.8x3         fountain pens, triple-lead, pen cap
*   M10x0.9           ...see 10.27x0.907, tire valve stem
@   M10x0.9
 %  M10x0.9           some tubing, push-fit adapters
 %  M10x0.9           on engines; pressure gauges, temperature sensors, car oil systems; gastro equipment rinse jet nozzles
 %  M10x0.9           tire valve stems, TMPS sensors (10.27x0.907?)
    M10x0.9           some odd locknuts? (aliexpress kit)
@   M10-26
    M10-26            on bicycles; M10x0.977, hollow axle, rear hub Campagnolo; rear axle, quick release, Campganolo
=== M10x1             common; ISO 261 1st, ISO primary fine, ISO 262 preferred, electrical conduit EN 60423, BS 3643-1:1981 1st constant, JIS B 0211, DIN fine, French automobile (Pas Fin), SI M.MB, ISA B (1940), SI fine (1971), DIN 13-5, "ISO-other", "series F" (TM 9-254, 1958), GOST 9150-59 constant, GOST 24705-81
    M10x1             less common fine than M10x1.25?
 %  M10x1 keg         pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M10x1             ISO 6149 hydraulic ports
 %  M10x1             "E10", electrical conduit
!g  M10x1             on single-use/disposable gas canisters, male on bottle; 136g, 500g, 600g, 1000g; welding gas (propane, butane, MAPP), oxygen, N2, argon, shield gas mixtures, helium (balloons, etc.); male on bottle; also M24x2 for larger bottles
 g  M10x1             fire extinguishers, manometer attachments, female on valve
 %  M10x1             some tubing systems, e.g. in plastic industry, DN 6 (also M14x1.5, M16x1.5)
 %  M10x1             tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M10x1             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M10x1             tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M10x1             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 4mm and 5mm tube
 %  M10x1             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 4mm and 5mm tube
 %  M10x1             fire extinguishers, outlet thread, female on valve, small 1-2kg ones; much less common than M14x1.5
 %  M10x1             fire extinguishers, dip tube, female on valve, standard on CO2 extinguishers
 %  M10x1             compression fitting, 5mm tube: metric Norgren/Enots, metric WADE; 6mm tube: metric WADE, Ni-plated brass
 %  M10x1             6mm tubing sleeve nut
 %  M10x1             hydraulic pressure test point nipples, Press-Check system, UNI 7707, ISO 15171-2
 %  M10x1             hydraulic test points, construction vehicles, Komatsu
 %  M10x1             common pipe attachment on bathroom sink faucets, female on tube
 %  M10x1             piping and nozzles of central lubrication
 %  M10x1             grease fitting nipples, "zerk", metric, common; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M10x1             found on vehicle braking systems; brake master cylinder thread, metric (TN24), most common metric, can be mismatched with 3/8-24; in fuel systems
 %  M10x1             car engine sensor port, oil pressure; Audi
 %  M10x1             car engine sensor port, oil temperature; Volkswagen
 %  M10x1             carburetor inlet fittings, uncommon, less common than 7/8-20
 %  M10x1             banjo bolts, tube fittings
 %  M10x1             faucet aerators, uncommon
 %  M10x1             standard bioreactor lid port; "11mm port", also "10mm port", female on port
 %  M10x1             on some paintball equipment, pressure gauges on eg. the M18 cylinder valves, male on gauge
    M10x1             spark plug thread, "M10"; SAE standard (nonpreferred for new applications)
    M10x1             diesel engine glow plugs (also M8x1, M9x1, M10x1.25, M12x1.25)
    M10x1             industrial igniters (also SAE), flamerods
    M10x1             thermocouple ports on eg. gas stoves/furnaces/ovens (also M8x1, M9x1, 11/32-32, 7/16-28)
    M10x1             thinner threaded-body industrial proximity sensors, eg. induction or photoelectric, less common
!S  M10x1             on lamps; base thread for lightbulb sockets, most common (also M8x1, M13x1, M16x1); hollow tube for wires; on E14 (M28x2 outside) and E27 (M40x2) lightbulb holders; on hooks, lampholders
    M10x1             on bicycles; most quick release rear axles, derailleur mounting bolts, brake lever adjusting barrels, gearshift, bottom bracket shaft tightening
    M10x1             fountain pens, common nose cone/front section, El Grande/Churchill kit front ends, assembly/section coupler
 t  M10x1             probe attachment on some micrometer dials
    M10x1             threaded ferrite cores
 w  M10x1             firearm barrel end thread, female on barrel
 w  M10x1             firearm barrel end thread, male on barrel, .22 LR ISSC M22 Gen 2 threaded pistol, Artemis CP2
 w  M10x1 LH          WW2 German artillery fuze, point detonation, in tip, standard for 2cm/3cm HE/HEI flak and aircraft cannon grenades, female for booster pellet; also M15x1 for grenade body
T   M10x1             present in AUTO-1, AUTO-2, M1-QS, M4-JS, N3-II, GEKO G38300 thread cutting set
H   .3937(-24) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; less common size
    M10x1.1           seen on some Japanese wafer-grinding equipment
====M10x1.12          ISO extended
H   10x1.25           Bodmer Thread, historical, 50°; for mechanical and optical instruments
=== M10x1.25          common; ISO 261 1st, ISO primary fine, ISO screws/bolts/nuts, ISO 262 preferred, French automobile (Pas Fin), BS 3643-1:1981 1st fine, JIS B 0211, MJ, JIS, ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, "ISO-other", GOST 9150-59 constant, GOST 24705-81
 %  M10x1.25 keg      pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M10x1.25          various small tube fittings, relatively uncommon
 %  M10x1.25          on flareless tube fittings, for 4 mm tube
 %  M10x1.25          found on vehicle braking systems, brake master cylinder thread, metric; in fuel systems
 %  M10x1.25          hydraulic test points, construction vehicles, Komatsu
    M10x1.25          pneumatic cylinder, MAL 25,32mm
    M10x1.25          diesel engine glow plugs (also M8x1, M9x1, M10x1, M12x1.25)
    M10x1.25          car wheel nuts
 t  M10x1.25          rotary tools - backing pads, brushes, European small, 100mm discs, male on arbor, less common than M10x1.5
T   M10x1.25          present in AUTO-1, AUTO-2, GEKO G38300 thread cutting set
    M10x1.25          thread insert, external thread; keylocking thinwall, M6x1; keylocking heavy duty, M5x0.8
    M10x1.25 LH,RH    on handlebars clamps on motorbikes, for handlebar accessories, eg. Suzuki, Honda, Kawasaki
    M10x1.25 LH       right-side Yamaha motorbike mirrors, in soft aluminium
    M10x1.25 LH       some brush cutter trimmers
H   Lh10x1.4          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   10x1.4 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
*   M10x1.5 STI       ...see 11.948x1.5 (screw thread insert)
H   10x1.5            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   10x1.5            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   10x1.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   10x1.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   10x1.5            S.F. No.1, French thread, S.F., System Francais; 60°; historical, before introduction of SI
H   10.00x1.50        French metric aircraft threads, from US Bureau of Standards LC18 1923
H   M10x1.5           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
==  M10(x1.5)         M10, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, JIS B 0209, MJ?, DIN coarse, French automobile (Pas Normal), "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "French", "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M10               hex head wrench size: 16 (ANSI/ISO), 17 (DIN), 14 (JIS)
    M10               DIN hex bolts have 1mm wider across-flats distance than ISO/ASME; for M10, M12, M14
    M10               common general purpose size
 %  M10x1.5           waterjet sapphire nozzle inserts (4000 bar), steel waterjet cleaner nozzles
 %  M10x1.5           found on vehicle braking systems; in fuel systems
 %  M10x1.5           grease fitting nipples, "zerk", metric, common; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M10x1.5           some tube fittings, hose barbs, uncommon
    M10               electrical binding posts, 320/350A
    M10x1.5           on MIG welding torch assemblies, shroud+tip to handle, also on assembly M6x1 for tip, M11x1.5 for shroud (also M9x1.25)
    M10x1.5           metric beer tap handles, some car gear shift knobs
    M10x1.5           on chem lab retort stand vertical rods, standard; most common rods are 12mm, also 1/2", 13 and 16mm
    M10               for pipe holders/clamps; together with M8 most common for "sane" sizes
    M10               geodetic tripod/pole pointy tips, male on tip
 t  M10               thread for auxiliary handles on angle grinders and drills, common
 t  M10               rotary power tools - metric standard, male on arbor; smaller sanding/polishing backig plates...; less common than M14
 t  M10x1.5           rotary tools - backing pads, brushes, European small, 115mm discs, male on arbor, see also M10x1.25, less common than M14x2
    M10x1.5           car engines, GM 6.2-6.5 MB, GM starter motor BH
    M10               on chainsaw gearwheels; also M14, M16
    M10x1.5           on bicycles; side stand attachment, platter plate
    M10x1.5           thread insert, external thread; EZ-Lok steel, 10-32, 10-24, M6x1
    M10               screw eyes, 100 kg; heavy ceiling hooks, 125kg load
    M10x1.5           propeller nut on some aircraft models
 w  M10               friction igniter for pyrotechnics, male on igniter, TZ-2, Czechoslovak
T   M10x1.5           present in GEKO G38300 thread cutting set
L   Tr10x1.5          trapezoidal fine, 30°, DIN 103; for leadscrews
@   M10x1.75
H   10.0x1.8          Armengaud thread, V-thread, 76° (later 55°), historical
@   E10(-14)          Edison thread (E thread DIN 40400), 9.3mm, 14tpi(1.81mm); lightbulbs, Miniature (MES), C6; Indicator lights, decorative lights; NSTC 1928/1933 (0.37..0.375 base, 0.3775..0.3835 socket), H28 1942/1944; BS 98:1962, "Miniature"
s   10-14             10x1.81; thread-rolling screws, Plas-Fix, for plastic, 60° thread
 p  SP10(-14)         10SP, glass/plastic bottle thread, SP-425; 10-425; chromatography vials big mouth, less common
@   M10x2
    M10x2             lock threads for Fischer Minimax size 08 connectors
L   M10x2 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; metric
 p  10x2              German bottle closure thread series; depth 0.68mm, crest radius 0.53mm, root radius 0.40mm
 p  GL10(x2)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  KS10(x2)          for plastic containers,    buttress thread DIN 6063-1, 40-deg
 p  KT10(x2)          for plastic containers, trapezoidal thread DIN 6063-2
L   Tr10(x2)          for leadscrews, metric trapezoidal thread, angle 30-deg
@   S10x2             buttress thread, coarse, 33°, DIN 513
@   Rd10(-10)         round/knuckle thread, DIN 405
@   Rd10(x3)          round/knuckle thread, DIN 20400
L   Tr10x3            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   DN10(-8)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
s   10x3.5            M5 threaded insert, DIN 7965; 60°, lesser dia 7.5mm
W   10x4.5            wood screws, DIN
=====#26 screw        wood/machine screw gage; 0.40000" 10.1600mm (American Screw Co. old standard) or 0.398" 10.109mm (ASME)
@   26-16             ASME standard (1907, Machinists Handbook 1909), NS, American Screw Co., Sellers, American Screw Company (0.404-16, Machinists Handbook 1909)
    26-16             found on Ford Model T
@   26-14             ASME special, NS, American Screw Co., Sellers
W   26-6              wood screw #26, Machinists Handbook 1909 (AmerScrewCo diameter)
=====0000 SWG         4/0 SWG, British Standard Wire Gauge, 0.400", 10.160mm
@o  0.40-36 Whitw.    10.16x0.706; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
 h  0.400-28          see also 0.300-28
H   10.16x0.9596      Mechaniker thread no.7, 26.8/17 tpi, 66° (size-specific); Siemens-Halske, German, in use until 1925, historical
H   0.400-16          Whitworth thread proposal, 1857
    0.4-10            toys, some wooden Erector-like construction set with plastic screws, size approximate
====10.27x0.907       10V2, Vg10, 10.27-28
@   10v2              tire valve, ISO 4570-2, 10.27x0.907 (28 tpi) (can be labeled M10x0.9?)
@   Vg10              tire valve, DIN 7756, equal to 10v2
=====1/8" pipe        0.405 in, 10.287 mm outer diameter, DN 6, NPS 1/8, nominal pipe size, US standard, ANSI/ASME B36; ASTM copper tube 6mm; ASTM B42 copper B43 red brass, wall th 0.062"/1.57mm standard, 0.1"/2.54mm extra strong
*   1/8 IPS           ...see 0.390-27 UNS
=== NPT 1/8(-27)      .4044-27, ~13/32-27, M10.27x0.941, also Z1/8-27; see .390-27 for NPS; 27-thread series, fine threads for thin-wall tubing; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 g  1/8-27 NPT        air valves, less common thread on nozzles for ball inflation; see 5/16-32 UNEF; common on pressure tanks
 g  1/8 NPT           small pneumatic tubing ports (also M3, M5, 10-32, 1/16 NPT, G1/8)
 %  1/8-27 NPTF       hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  1/8 NPT           grease fitting nipples, "zerk", US; very common, common on grease extension hoses; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 %  1/8 NPT           common attachments for manometers and fuel pressure sensors in racing cars
 %  1/8-27 NPTF       car engine sensor port, water temperature; Ford, Saab
 %  1/8-27 NPTF       car engine sensor port, oil pressure; British Leyland
 %  1/8 NPT           couplings in lab instrumentation, less common than 1/4-28 or M6
 %  1/8-27 NGT        gas bottle valve thread, female on bottle, taper 1:16; valve outlet #160
 %  1/8-27 NGT        gas bottle neck thread, female on bottle, taper 1:16, CGA V-1, SI no. 1a
 %  1/8-27 NPSG       standard pipe thread for lubricators with cup
 S  1/8 IP            architectural suspension systems, typ. for 3/64" 1.19mm, 1/16" 1.59mm cable (straight, side), 3/32" 2.38mm (side, male thread)
@   Fg10.3            M10.3x0.977, M10.3-26; bicycle thread, not in DIN 79012
    FG10.3            on bicycles; hub gears Sturmey-Archer
=====0000 USG         4/0 USG, US standard gauge for sheet plate steel, 15 US Code sec.206, 13/32", 0.40625", 10.32mm
    13/32-40          on some Thorlabs SR9 cable strain reliefs for laser diode mounts, 10.319x0.635
@   13/32-32 BSW
@   13/32-32 UNS
    13/32-27
    13/32-26          on bicycles; rear axle, hub gear, Sachs
@   13/32-24
@   13/32-20
@   13/32-16
    13/32-16          on Aermotor Windmill Company mills
    13/32-16          on Ford Model T rear housing
    13/32-16          hanging bolts for sewing heads; Union Special 80800xx, Newlong, NLI DS2ii, DS6
    13/32-13          on Aermotor Windmill Company mills
=====000 AWG          3/0 AWG, American Wire Gauge, Brown&Sharpe, 0.4096", 10.405mm; copper conductors, 85.0mm2, 0.2028mΩ/m, 165..225 amps (60/90°C)
H   0.41-19.89        Holtzapffel & Co. (1856), historical; 10.41x1.28; tap/die "G", comb-screw tool no.6, mandrel guide no.4
=====#27 screw        wood/machine screw gage; 0.41316" 10.494mm (American Screw Co. old standard)
W   27-6              wood screw #27, Machinists Handbook 1909 (AmerScrewCo diameter)
@   M10.5x0.35        DIN 13-2
@   M10.5x0.5         DIN 519 (avoid), DIN 13-3
 o  M10.5x0.5         lens mount, "U-mount"; flange focal dist. 3.8/3.9mm (external) or 9.7mm (internal); in machine vision, eg. FH/FZ camera family, 1/3" CCD, 12mm-dia objective tubes (also M15.5x0.5)
 o  M10.5x0.5         lens mounting ring, for 10mm-dia lens mounts, eg. Thorlabs
 o  M10.5x0.5         mounting bores for Thorlabs 10mm-dia optic mounts
 t  M10.5x1           on some adjustable reamers (Beck)
    M10.5x0.5         panel nuts for Fischer Minimax size 08 connectors; nut outer dia 13mm
@   M10.5x0.75        DIN 13-4
    M10.5x0.75        on push-fit tube couplers, R26 cartridge slots for 5mm dia
@   Fg10.5            M10.5x0.977, M10.5-26; bicycle thread, not in DIN 79012
    FG10.5            on bicycles; rear axle, cones and nuts
@   M10.5x1           DIN 13-5
@   27/64-32 USF      USF, old standard
=====#28 screw        wood/machine screw gage; 0.42632" 10.8285mm (American Screw Co. old standard) or 0.424" 10.770mm (ASME)
@   28-16             ASME standard (later?), NS, American Screw Co., Sellers
@   28-14             ASME standard (1907, Machinists Handbook 1909) (or later special?), NS, American Screw Co., Sellers, American Screw Company (0.430-14, Machinists Handbook 1909)
 t  28-14             1874 Lathe & Morse Tool Co. lathe has a No. 28x14 screw holding the spindle bearing caps down
W   28-6              wood screw #28, Machinists Handbook 1909 (AmerScrewCo diameter)
=====000 BWG          3/0 BWG, Birmingham Wire Gauge, Stubbs Gauge, 0.425", 10.80mm
H   0.425-14          Whitworth thread proposal, 1857
H   10.86x1.3170      Mechaniker thread no.6, 19.2/7 tpi, 57° (size-specific); Siemens-Halske, German, in use until 1925, historical
@   0.4291-24         STI-3/8-24, 10.9x1.06; screw thread insert thread, ASME B18.29.1
=====00000 SWG        5/0 SWG, British Standard Wire Gauge, 0.432", 10.973mm
@   M11x0.35          DIN 13-2
@   M11x0.5           ISO extended, DIN 13-3, DIN 519 (2nd), GOST 9150-59 constant, GOST 24705-81
 o  M11x0.5           aspheric mounted-pair lens housing
 o  M11x0.5           some diode laser housings/lenses; can attach holder of M9x0.5 lens to M11x0.5 laser diode mount body; laser collimators; most common; also M12x0.5, M13x0.5
 %  M11x0.5           some pressure sensors, rare?
====M11x0.75          ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M11x0.75          some lens mounting rings
 %  M11x0.75          some hydraulics fittings
    M11x0.75          some panel nuts, drive cable nuts
    M11x0.75          panel nut, Hirose HR10A 10,12-pin connectors
    M11x0.75          screw-in thread on bodies of some M8 connectors
    M11x0.75          speedo tacho cable coupler nuts; also M12x1
T   M11x0.75          present in GEKO G38300 thread cutting set
    M11x0.8x3         triple-lead, some fountain pens, pen cap
====M11x1             ISO 261 3rd, ISO tertiary fine, French automobile (Pas Fin), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MB, ISA B (1940), SI fine (1971), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
!g  M11x1             on some single-use gas cylinders, e.g. disposable food-grade CO2 cylinders
 g  M11x1             some gas cooker nozzles; Cookmax, Ambach, Olis...
 %  M11x1             compression fitting, 6mm tube: metric Norgren/Enots
 t  M11x1             on some tooling collets; internal thread in shank of a mini-ER16/mini-ER20/mini-ER25 collet, ER DIN 6499
    M11x1             panel nuts, eg. on some "M8" circular connectors, some pushbutton switches
 w  M11x1             firearm barrel end thread, female on barrel, on WE pistols
 w  M11x1             on some pyrotechnic gas generators (M16x1.5, G1/8, G1/4, G3/8; M11x1; 3/8-24)
T   M11x1             present in AUTO-1, AUTO-2, N3-II, GEKO G38300 thread cutting set
====M11x1.25          French automobile (Pas Fin)
 %  M11x1.25          metric pipe thread, less common
 g  M11x1.25          some balloon filling inflation nozzles
 %  M11x1.25          some liquid flow sensors
 %  M11x1.25          found on vehicle braking systems, rare; banjo bolts
    M11x1.25          common on car engine heads (eg. Subaru, Opel), some Alpha Romeo seat belt bolts, some Toyota flywheel bolts, some connecting rod bolts; may enforce use of rolled-thread strong OEM bolts
 p  M11x1.25          on packaging tubes; much less common than M11x1.5
T   M11x1.25          present in GEKO G38300 thread cutting set
H   11x1.25           Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   11x1.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   11.00x1.50        French metric aircraft threads, from US Bureau of Standards LC18 1923
=== M11(x1.5)         M11, "4th choice/avoid"; ISO 261 3rd, ISO tertiary coarse, BS 3643-1:1981 3rd coarse, JIS B 0209, DIN, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M11x1.5           brake master cylinder thread, metric (TN26), rare
    M11x1.5           common on car engine heads (Toyota, Scion, Honda, General motors, Kia, Cadillac Northatar and many other aluminum engine blocks)
    M11x1.5           on some oil sumps
    M11x1.5           common on MIG welding torch gas nozzles, female on nozzle (also 9/16-18)
    M11x1.5           laser cutting and welding nozzles, male on nozzle (also M8, M10, M13)
 p  M11(x1.5)         on packaging tubes; "M11"; ordinary-size tubes, very common; on 19mm and 25mm tubes; on 25mm,28.6mm,30mm,32mm,35mm,38.1mm aluminium tubes
T   M11x1.5           present in AUTO-1, GEKO G38300 thread cutting set
@   M11x1.75
    M11x1.75          on some gastronomy equipment, nut in a Best coffee grinder
@   M11x2
    M11x2             on some Corvette engines
 p  11x2              German bottle closure thread series; depth 0.68mm, crest radius 0.53mm, root radius 0.40mm
L   Tr11x2            trapezoidal fine, 30°, DIN 103; for leadscrews
@   M11x2.5
@   E11               Edison thread (E thread DIN 40400), lightbulbs, Mini-Candelabra, Miniature Candelabra; 120V-halogen; 14 tpi?
@   Rd11(-10)         round/knuckle thread, DIN 405
L   Tr11x3            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
H   11.02x1.0477      Mechaniker thread no.5, 24.8/33 tpi, 52° (size-specific); Siemens-Halske, German, in use until 1925, historical
*   7/16" GAS         ...see 0.459-27
=====00000 USG        5/0 USG, US standard gauge for sheet plate steel, 15 US Code sec.206, 7/16", 0.4375", 11.1125mm
@   7/16-64
@   7/16-56
@   7/16-48
@   7/16-40 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   7/16-40 WS        Whitworth Special
====7/16-40 UNS       NS, UNS (H28 1963)
 h  7/16-40           on antique (ca. 1920) Hardinge Cataract lathes
@   7/16-36 UNS       UNS (H28 1963)
@   7/16-32 ME        Model Engineer, Whitworth-based, 55°, est.1912; some model boiler fittings, rare
====7/16-32 UN        32UN, 32-thread, constant pitch series, NS, UNJ, "32N", UN (H28 1963)
    7/16-32           some panel nuts, rare
@   7/16-30
@   7/16SM28          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M11.1x0.907
    7/16SM28          sewing machines, Singer tap TE4; alternative 7/16-28 UNEF
=== 7/16-28 UNEF      M11.11x0.907, primary size, 28UN, SAE extra fine (1915/1926), NS, UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
!g  7/16-28 UNEF      propane/butane/LPG gas cartridges (male on cartridge), Lindal B188 valve, usual in camping and smaller torch bottles, "EU thread" (see 1-20 UNEF for US thread), "EN 417" (somewhat incorrectly) [ref]; common worldwide on disposable cylinders; threadless alternative is Bayonet Camping
 %  0.438-28 UNEF     conduit fittings, MIL-PRF-24758-2, size A
!C  7/16-28           TNC coax connectors, 11.1mm
 C  7/16-28 UNEF      connectors, eg. circular Micro-Con-X Switchcraft connectors
    0.4375-28 UNEF    circular connectors, MIL-DTL-38999; size 9, shell/accessory, code A, coupling is 0.625-10x3
    7/16-28 UNEF      thermocouple ports on eg. gas stoves/furnaces/ovens (also M8x1, M9x1, M10x1, 11/32-32)
    7/16-28           vintage Harley Davidson motorcycles; chassis, clutch lever, 1941-73 "45"
    7/16-28           panel nut, on some circuit breakers and switches; also 3/8-27, 15/32-32
    7/16-28 UNEF      rear thread on screw-in waveguide probe Type-N connector, 18 GHz (Southwest Microwave)
    7/16-28           attachment thread for some antennas, often integrated with TNC coax; usually female thread (male connector) on antenna; see also 1/4-36 (SMA)
 w  7/16-28           Remington shotgun receiver stud
*   7/16-27 GAS       ...see 0.459-27
====7/16-27 UNS       NS; 27-thread series, fine threads for thin-wall tubing; "27N", NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  7/16-27           some faucet seats; American Standard, Speakman
 %  7/16-27           some old grease guns, hose/pipe thread
 %  7/16-27 UNF       grease fitting nipples, "zerk", US; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 %  7/16-27 UNS       on some gas plug orifices, nozzles (Honeywell pilot orifice, male and female); common on pilot orifices (also 7/16-24)
    7/16-27           thermocouple connections to automatic fuel gas valves on furnaces and boilers (perhaps 7/16-28?)
@   7/16(-26) BSB     British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   7/16-26 ME        Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
H   7/16-26 CEI       Original Cycle, British bicycles, 60°, historical
@   BC 7/16-26        BC7/16, 11.11xx0.977, bicycle thread, general use, rear hub shaft for heavy loads, JIS B 0225
@   7/16-26 BSC       British Standard Cycle, bicycles, 60°; CEI; also as LH; bolts and nuts
T   7/16-26 BSC       basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
@   7/16-26
H   7/16(-24) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 11.113x1.058
@   7/16-24 WS        Whitworth Special, Whitform
@   7/16-24 BSC       British Standard Cycle, CEI, bicycles (not in Guide to World Screw Threads)
====7/16-24 UNS       NS, USSS; UNS (H28 1963), ASME B1.1-2003 Appendix D, Sellers
 %  7/16-24           tube coupling, 1/4" tube, standard compression fitting with ferrule
 %  7/16-24           tube coupling, 1/4 ("-4"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  7/16-24           JIC tube fittings, for 1 tube
 %  7/16-24           tube coupling, brake thread ("-4"), 1/4" tube, sleeve nuts on tubes;, in truck air brakes
 %  7/16-24 UNS       found on vehicle braking systems, brake master cylinder thread, SAE, very common
 %  7/16-24 UNS       on some gas plug orifices, nozzles; on Honeywell pilot orifice (female), general controls pilot orifice; common on pilot orifices (also 7/16-27)
 %  7/16-24           some faucet seats; American Standard
 t  7/16-24           threaded shanks of reamers, countersinks (also 10-32, 1/4-28, 3/8-24)
*   7/16-20 STI       ...see 0.5025-20, 12.8x1.27 (screw thread insert)
H   7/16-20 BSW cyc   British Whitworth cycle
@   7/16-20 WS        Whitworth Special, Whitform
@   7/16-20 BSC       British Standard Cycle, CEI20, bicycles (not in Guide to World Screw Threads)
=== 7/16(-20) UNF     M11.11x1.27, primary size, screw "L" (US), 20UN, ALAM automobile standard (Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF (B1.1-1935), UNF (H28 1950/1957), UNF/UN (H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
c   7/16-20 UN        UNF standard; 20UN, 20-thread, constant pitch series
    AN7               aircraft bolts, 7/16-20 UNF-3A; AN27, clevis bolt; AN77, drilled head; AN177, close tolerance, less common; AN47, eye bolt
 %  4AN               7/16-20 fitting thread, usually with 37-deg flare; common on aviation and racing car fuel systems, some brakes (piston inlet)
 %  7/16-20 UNF       Swagelok fittings; series 400, 1/4" tubes; 6mm tubes
 %  7/16-20           tube coupling, 1/4" tube, standard flare fitting
 %  7/16-20           tube coupling, 1/4 ("-4"), SAE 45-deg flare (SAE J512), flare male on male
 %  7/16-20 UNF       tube coupling, 1/4 ("-4"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  7/16-20           tube coupling, 1/4 ("-4"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  7/16-20           tube coupling, 1/4 ("-4"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  7/16-20           JIC tube fittings, for 1/4 tube
 %  7/16-20 UNF       hydraulic pressure test point nipples, Press-Check system, ISO 15171-2; SAE J514 JIC 37deg flare
 %  7/16-20 UNF       common on manometers in USA; also 1/4 NPT
 %  7/16-20 UNF       ports in scientific apparatus vessels; according to: SAEJ1926, SAEJ514; AS5202, 6M152, AS1300, AS4201, PS10035 (for UNJF)
 %  7/16-20           on oil filters; lube; rare
 %  7/16-20 UNF       found on vehicle braking systems
 %  7/16-20 UNF       waterjet sapphire nozzle inserts (4000 bar)
 %  7/16-20           piping threads, on eg. refrigerator fittings; refrigerator pressure sensors (female on sensor)
 %  7/16-20           some faucet seats
 g  7/16-20 UNF       SCUBA diving regulators, first stage, high-pressure gauge hose; female on regulator, male on manometer, hose in between
 g  7/16-20           car air conditioning refrigerant coupling, US EPA standard, CFC-12, high-side port, 30-lb cylinders, small cans
 g  7/16-20 LH        car air conditioning refrigerant coupling, US EPA standard, R-414A/GHG-X4/HCFC Blend Xi/McCool Chill It, low side port; R-416A/FRIGC FR-12/HCFC Blend Beta, small cans
!g  7/16-20 UNF       common cap thread on tire air valves
    7/16-20 UNF       car wheel nuts; SAE/US standard; common
    7/16-20           vintage Harley Davidson motorcycles; motor, head bolt, 1948-83 OHV "BT"; base stud nut, 1930-83 "BT"
 t  7/16-20           collet chuck drawbar end on R8-shank ER32/ER40
 w  0.4375-20 UNC-2A  7/16-20, on US mines/grenades, small fuzes/initiators; eg. on M14 antipersonnel mine
    7/16-20           panel nuts
====11v1              tire valve, ISO 4570-3, 11.1x1.270 (20 tpi)
@   7/16-18 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   7/16(-18) BSF     British Whitworth Fine-pitch; W11.112x1.41; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "L" (UK)
@   7/16-18 UNS       NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  7/16-18 UNF       hydraulic test points, construction vehicles, Caterpillar
====7/16-16 UN        16UN, 16-thread, primary size, constant pitch series, NS, UNJ, UN (H28 1963); originally for adjusting collars, retaining nuts
    7/16-16           vintage Harley Davidson motorcycles; motor, head bolt, 1940-73 "45", 1930-48 SV "BT", 1936-47 OHV "BT"
    7/16-16           threaded-body industrial proximity sensors, eg. induction or photoelectric
    7/16-16           1940's Delta/Rockwell 6" jointer, table raising assembly (-16 pitch common on such devices, so one crank turn corresponds to 1/16" movement)
H   7/16-14           Whitworth thread proposal, 1841 (replaced with 0.450-14 in 1857)
*   7/16-14 STI       ...see 0.5303-14, 13.5x1.81 (screw thread insert)
@   7/16-14 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   7/16(-14) BSW     British Standard Whitworth; W11.112x1.814; 55°; secondary size; 7/16W14 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   7/16-14           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   7/16-14           stove bolt series, "SB", manufacturer standard, USA
H   7/16-14           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 7/16(-14) UNC     M11.11x1.814, primary size, UNJC, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957, H28 1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
 g  7/16-14           car air conditioning refrigerant coupling, US EPA standard, SP34E, high side port
 g  7/16-14 LH        car air conditioning refrigerant coupling, US EPA standard, Freeze 12, high side port
    7/16-14           vintage Harley Davidson motorcycles; motor, head bolt, 1952-56 "K"/"KH"; base stud, case, 1930-83 "BT"
    7/16-14           car engines, GM small block M B
    7/16-14           on cars, standard bumper bolts (3/8-16, 7/16-14, 1/2-13)
    7/16-14           thread insert, external thread; keylocking and EZ-Lok steel thinwall, 5/16-24, 5/16-18; keylocking heavy duty and EZ-Lok steel, 1/4-28, 1/4-20
@   7/16-12
L   7/16-12 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard US size (NSTC 1933, H28 1942/1944), class 2G/3G/4G
    7/16-11           billiard/pool cue joining pin, less common
@   7/16-11
L   7/16-10 ACME      leadscrew, general-purpose only; BS 1104:1957, class 2G/3G/4G/5G
    7/16-10 ACME      leadscrew, on Rivett lathes
W   7/16-7            coach and lag screws (Machinists Handbook 1909, modern)
=====#29 screw        wood/machine screw gage; 0.43948" 11.1628mm (American Screw Co. old standard)
W   29-6              wood screw #29, Machinists Handbook 1909 (AmerScrewCo diameter)
    M11.3x1           for some repair M10x1 thread inserts, unusual
    M11.3x1.25        for some repair M10x1.25 thread inserts, unusual
H   11.3x1.690        FS -5, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -5, 0.4449-15
H   11.37x1.8246      Mechaniker thread no.4, 13.23/25 tpi, 59° (size-specific); Siemens-Halske, German, in use until 1925, historical
 o  M11.4x0.5         laser optics, on X3 beam expander (Sanwu Lasers)
    0.450-26          thread on Sharpie Refill pens (according to Tapco office supplies), may also fit M11.5x1
=====#30 screw        wood/machine screw gage; 0.45264" 11.4971mm (American Screw Co. old standard) or 0.450" 11.430mm (ASME)
@o  0.45-36 Whitw.    11.43x0.706; British optical instruments, fine motion and adjustment; 10% greater tooth depth (smaller radius), recommended size by British Optical Standards
H   0.45-16.5         Holtzapffel & Co. (1856), historical; 11.43x1.54; tap/die "F", comb-screw tool no.5, mandrel guide no.3
@   30-16             ASME standard (later?), NS, American Screw Co., Sellers
H   0.450-14          Whitworth thread proposal, 1857 (replaces 7/16-14 from 1841)
@   30-14             ASME standard (1907, Machinists Handbook 1909) (or later special?), NS, American Screw Co., Sellers, American Screw Company (0.456-14, Machinists Handbook 1909)
 t  #30-??            1874 Lathe & Morse Tool Co. lathe has No. 30 screws holding the spindle bearing to the headstock
W   30-6              wood screw #30, Machinists Handbook 1909 (AmerScrewCo diameter)
@   M11.5x0.35        DIN 13-2
@   M11.5x0.5         DIN 13-3, DIN 519 (avoid)
 o  M11.5x0.5         lens mounting ring, for 11mm-dia lens mounts, eg. Thorlabs
    M11.5x0.5         panel nut, on some pushbutton switches
    M11.5x0.5         piston rod, KTM motorbikes
@   M11.5x0.75        DIN 13-4
 %  M11.5x0.75        on push-fit tube couplers, R26 cartridge slots for 6mm dia
 C  M11.5x0.75        on "business end" of circular SR30/PLT connectors, male on panel (M9x0.75 panel nut)
@   M11.5x1           DIN 13-5
    M11.5x1           some motorcycle piston rods, eg. KTM; also M12x1
    M11.5x1           thread on Sharpie pens, possible substitute for 0.450-26; M12x1 is a loose fit
 w  M11.5x1           firearm barrel end thread, female on barrel, on MP7A1 HK
    M11.5x1.25        some water level sensors (Atkins Rotary)
@   M11.5x1.5         DIN 516 (avoid)
    M11.5x1.5         on a rod axle joint, Honda Civic
=====0000 BWG         4/0 BWG, Birmingham Wire Gauge, Stubbs Gauge, 0.454", 11.53mm
@   0.4562-16         STI-3/8-16, 11.6x1.59; screw thread insert thread, ASME B18.29.1
@   0.459-27          gas (brass pipe) thread, size 7/16", 11.659x0.941; 27-thread series, fine threads for thin-wall tubing
=====0000 AWG         4/0 AWG, American Wire Gauge, Brown&Sharpe, 0.4600", 11.684mm; copper conductors, 107mm2, 0.1608mΩ/m, 195..260 amps (60/90°C)
=====000000 SWG       6/0 SWG, British Standard Wire Gauge, 0.464", 11.786mm
=====#31 screw        wood/machine screw gage; 0.46580" 11.8313mm (American Screw Co. old standard)
=====000000 USG       6/0 USG, US standard gauge for sheet plate steel, 15 US Code sec.206, 15/32", 0.46875", 11.91mm
@   15/32-40          ANSI inch size
====.469-32 UNS       ABMA #1 locknut, N-01, M11.91x0.794, 15/32-32, NS
    15/32-32 UNS      panel nut; bulkhead switch/button nut thread,spanner ~15     th. ~1.7   (14.0, tt 16.0, th.2.0); also 3/8-27, 7/16-28
    15/32-32          panel nuts, many pushbutton and toggle switches, panel-mounted pressure regulators
    15/32-32          external thread on some bulkhead pneumatic fittings
    15/32-32          some threaded-rod style proximity sensors (eg. inductive, reed switches)
@   15/32-24          ANSI inch size
@   15/32-18
s   15/32-18          M11.91x1.41; on self-tapping threaded inserts for 5/16-18 and M8
@   15/32-12
    15/32-12          on Aermotor Windmill Company mills
@   11.948x1.5        STI-M10x1.5, screw thread insert thread, DIN 8140-2
===== 12mm Cu tube    12mm outer-dia tube; ASTM B88M type A/1.2mm, B/0.9mm, C/0.6mm; EN 1057, wall th 0.6,0.7,0.8,1.0mm; BS 2871, table X (wall th 0.6mm, 6.3 MPa), Y (0.8mm, 6.7 MPa), Z (0.5mm, 6.4 MPa)
@   M12x0.35          DIN 13-2
 o  M12x0.35          lens mount, uncommon; on Gopro Hero Black/5+ Silver/5+ Black/6 Silver/6+ Black/7 Silver/7; Hero 4 and earlier use standard M12x0.5
==  M12x0.5           ISO extended, DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
!o  M12x0.5           lens mount, "S-mount", "board lens", "M12", very common, most common on board cameras; 1/6" 1/4" 1/3" sensors, backfocus usually between 0.5 and 12mm; machine vision standard JIIA LE-005 (Aug 2012), JIIA image size class II, 1st choice
    M12x0.5           some diode laser housings; also M11x0.5, M13x0.5
    M12x0.5           e-cig/vape, eGo thread, male on battery, female on atomizer, battery with 510 thread inside
 t  M12x0.5           screws/clamp nuts on some micrometer heads mounting stems, less common than M9.5x0.5
    M12x0.5           bulkhead nuts on some connectors, eg. M9 round ones
@o  0.4724-36 NS      12.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
====M12x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M12x0.75          lens mount, much less common than M12x0.5; board cameras; in machine vision
 o  N12x0.75          on some microscope objectives, unusual
 %  M12x0.75          on some welding/heating torches, some pneumatic systems
    M12x0.75          connector, 4mm female banana jack with safety sleeve
 C  M12x0.75          panel nuts, PC7-type circular connectors, RS7 connectors panel+sleeve nut
    M12x0.75          panel nut, on some 8mm-dia LED panel holders, some toggle switches, buttons, endstop switches; some toggle switches (incl. rubber boots for levers)
    M12x0.75          panel nut, on some pneumatic/hydraulic panel-mount valves
    M12x0.75          thermocouple ports on some stoves, etc. (also M9x1, etc.)
 t  M12x0.75          some tooling collets
    M12x0.75          fountain pens, common cap thread, popular single-start; see also M12x0.75x3, M12x0.8x3
 w  M12x0.75          barrel thread on Glock 42 and Glock 43, male on barrel
T   M12x0.75          present in GEKO G38300 thread cutting set
    M12x0.75x3        fountain pens, triple-lead, common cap thread
    M12x0.8x3         also M12x0.8x2.4; fountain pens, triple-lead, pen cap, on El Grande/Churchill
@   0.4724(-26) BSB   W12x0.977; British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances, secondary size?
=== M12x1             common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M12x1 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M12x1             pipe connections for pressure sensors, male on sensor
 %  M12x1             tube coupling, French millimetric 24-deg seat, 6mm tube
 %  M12x1             found on vehicle braking systems, brake master cylinder thread, metric (TN27); some speedo/tacho drive cable nuts
 %  M12x1             grease fitting nipples, "zerk", metric; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M12x1             compression fitting, 8mm tube: metric WADE, Ni-plated brass
 %  M12x1             8mm tubing sleeve nut
 %  M12x1             fire extinguishers, outlet thread, female on valve, less common than M14x1.5; also M12x1.5
    M12x1             spark plug thread, less common (see also M12x1.25)
    M12x1             bulkhead switch/button nut thread, spanner 14.0mm, tip-tip 16.0, th.2.0 (14.3, tip-tip 16.0; 15.2dia)
    M12x1             threaded-body industrial proximity sensors, eg. induction or photoelectric; also M6x0.5, M18x1
    M12x1             circular connectors, MIL-DTL-38999; size 9 shell/accessory, code A, coupling is 0.625-10x3
!C  M12x1             "M12" circular connectors, "Eurofast"; common thread on "aviation connectors" with sleeve nuts, eg. GX12; most common mid ones; common on industrial sensors, ethernet
    M12x1             on bicycles, bottom bracket; crank bracket bottom bracket; some spline crankset bolts; bottom bracket shaft tightening
    M12x1             speedo tacho cable coupler nuts; also M11x0.75
    M12x1             bearing retaining locknut, "KM1", ISO 2982 (1971)
    M12x1.2           car wheel nuts; very rare
 t  M12x1             smaller lathe chucks; Emco Maier Unimat SL
 w  M12x1             firearm barrel end thread, female on barrel
 w  M12x1             firearm barrel end thread, male on barrel, Sig P226 Air pistol
T   M12x1             present in AUTO-1, AUTO-2, M1-QS, M4-JS, N3-II, GEKO G38300 thread cutting set
@   M12x1.2
T   M12x1.2           present in M4-JS thread cutting set
=== M12x1.25          common; ISO 261 1st, ISO primary fine, ISO screws/bolts/nuts, ISO 262 preferred, French automobile (Pas Fin), BS 3643-1:1981 1st fine, JIS B 0211, MJ, new JIS fine, ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M12x1.25 keg      pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M12x1.25          tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 6mm tube
 %  M12x1.25          tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 6mm tube; O-ring face seal (JB1887), 4mm tube oring
 %  M12x1.25          found on vehicle braking systems
 %  M12x1.25          carburetor inlet fittings, less common than 7/8-20; also M12x1.5
 %  M12x1.25          car engine sensor port, oil temperature; Nissan
 %  M12x1.25          car exhaust oxygen sensors; much less common than M18x1.5
 %  M12x1.25          common on metric flame-welding torch nozzles
    M12x1.25          spark plug thread, "M12"; SAE standard (nonpreferred for new applications); way less common is M12x1
    M12x1.25          diesel engine glow plugs (also M8x1, M9x1, M10x1, M10x1.25, M12x1.5)
    M12x1.25          car wheel nuts, bolts; very common
    M12x1.25          car oil pan drain
    M12x1.25          pneumatic cylinder, MAL 40mm
    M12x1.25          compressor oil sight
    M12x1.25          thread insert, external thread; keylocking thinwall, M8x1.25; keylocking heavy duty, M6x1
 p  M12x1.25          on packaging tubes; less common than M11
 p  M12x1.25 LH       on packaging tubes; very rare
T   M12x1.25          present in AUTO-1, AUTO-2, GEKO G38300 thread cutting set
H   12x1.471          Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   12x1.5            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   12x1.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
=== M12x1.5           common; ISO 261 1st, ISO primary fine, ISO 262 preferred, French automobile (Pas Fin), electrical conduit EN 60423, BS 3643-1:1981 1st constant, "French metric" (Machinists Handbook 1909), JIS B 0211, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.13M fine (only wheel studs/nuts), DIN 13-6, DIN 516, ese JIS fine changed to M12x1.25 in 1960s; "French", GOST 9150-59 constant, GOST 24705-81
    M12x1.5           less common fine than M12x1.25?
 %  M12x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M12x1.5           ISO 6149 hydraulic ports
 %  M12x1.5           "E12", electrical conduit
 %  M12x1.5           metric pipe thread DIN 7631
 %  M12x1.5           tube coupling, 6mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M12x1.5           tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M12x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M12x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 6mm tube (light)
 %  M12x1.5           tube coupling, Komatsu equipment, 30-deg cone (male cone on male)
 %  M12x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 6mm tube; DIN "L", 6mm tube
 %  M12x1.5           on flareless tube fittings, for 6 mm tube
 %  M12x1.5           hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  M12x1.5           fire extinguishers, outlet thread, female on valve, small (1-2 kg), much less common than M14x1.5; also M12x1
 %  M12x1.5           cable gland, PG7     cable 3.5..6(3..6.5?)mm         spanner 15mm
 %  M12x1.5           found on vehicle braking systems, brake master cylinder thread, metric
 %  M12x1.5           grease fitting nipples, "zerk", metric; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M12x1.5           carburetor inlet fittings, less common than 7/8-20; also M12x1.25
 %  M12x1.5           car engine sensor port, oil pressure; BMW, Citroen, Talbot/Simca
 %  M12x1.5           some garden sprayer systems (also M17x1)
 %  M12x1.5           steel waterjet cleaner nozzles (3000 bar)
    M12x1.5           diesel engine glow plugs (also M8x1, M9x1, M10x1, M10x1.25)
    M12x1.5           car wheel nuts, bolts; most common
    M12x1.5           car oil pan drain
    M12x1.5           on outside of bulkhad push-in tube couplers, 4mm tube
T   M12x1.5           present in AUTO-1, AUTO-2, M1-QS, M4-JS, N3-II, GEKO G38300 thread cutting set
H   Lh12x1.6          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   12x1.6 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
*   M12x1.75 STI      ...see 14.274x1.75 (screw thread insert)
H   12x1.75           S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   12x1.75           Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   12.00x1.75        French metric aircraft threads, from US Bureau of Standards LC18 1923
==  M12(x1.75)        M12, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, MJ?, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "series E" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M12               hex head wrench size: 18 (ANSI/ISO), 19 (DIN), 17 (JIS)
    M12               DIN hex bolts have 1mm wider across-flats distance than ISO/ASME; for M10, M12, M14
    M12x1.75          car engines, 7.3 Int. Powerstroke MB, 7.3 Int. DI inner MB, GM 6.2-6.5 MB, 6.5 GM HB
    M12               semiconductor packaging, stud-mounted diodes/SCRs; typ. DO8, DO-205AA; imperial is 3/8-24 UNF; E14 case
    M12x1.75          threaded-body industrial proximity sensors
    M12               for heavy pipe holders/clamps
 S  M12               some architectural cable suspension couplers
    M12x1.75          car wheel nuts, bolts
    M12               toilet brush head attachment thread, female on head
    M12               screw eyes, 175 kg; heavy ceiling hooks, 175kg load
    M12x1.75          high-strength injection structural bolts, DIN 6914
    M12x1.75          thread insert, external thread; EZ-Lok steel, 1/4-20, 5/16-18, M8x1.25
 w  M12               friction igniter for pyrotechnics, male on igniter, TZ-M, Czechoslovak
 w  M12               electrical igniters, male on igniter (as "sleeve bolt", loose with wires through the center), EPIC/EPIO/EPIP, Czechoslovak; igniter itself 7mm dia, 47mm long
T   M12x1.75          present in GEKO G38300 thread cutting set
@   M12x2
L   Tr12x2            trapezoidal fine, 30°, DIN 103; for leadscrews
 p  GL12(x2)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  KS12(x2)          for plastic containers,    buttress thread DIN 6063-1, 40-deg; secondary size
 p  KT12(x2)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
@   S12x2             buttress thread, fine, 33°, DIN 514
@   Rd12(-10)         round/knuckle thread, DIN 405
@   S12x3             buttress thread, coarse, 33°, DIN 513
@   Rd12(x3)          round/knuckle thread, DIN 20400
@   M12x3 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; metric
 p  12x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
L   Tr12x3            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   E12(-10)          Edison thread (E thread DIN 40400), 11.5mm, 10tpi (2.54mm); lightbulbs, Candelabra (CES), C7; Indicator lights, decorative lights; uncommon; NSTC 1928/1933 (0.46..0.465 base, 0.47..0.476 socket), H28 1942/1944
s   12x4              M6 threaded insert, DIN 7965; 60°, lesser dia 9.5mm
W   12x5              wood screws, DIN
H   0.475-14          Whitworth thread proposal, 1857
=====#32 screw        wood/machine screw gage; 0.47896" 12.1656mm (American Screw Co. old standard)
====12.17x0.977       12V1, Vg12, .479-26, also .485-26
@   12v1              tire valve, ISO 4570-2, 12.17x0.977 (26 tpi)
@   Vg12              tire valve, DIN 7756, equal to 12v1
@   0.485-26          (M12.32x0.977) tire valve caps 12V1, less common large size, see .305-32 or 8V1 for smaller
    12V1              large-bore OTR valves on tires, air-liquid valves on tractor tires, external thread on stem; for internal thread see 8V1 (OTR), 9V1 (tractor); some have 9V1 mounting base
H   12.30x1.4711      Mechaniker thread no.3, 17.17/64 tpi, 54° (size-specific); Siemens-Halske, German, in use until 1925, historical
@   .485-26           ...see 12.17x0.977, 12V1
=====#33 screw        wood/machine screw gage; 0.49212" 12.4998mm (American Screw Co. old standard)
@   M12.5x0.35        DIN 13-2
@   M12.5x0.5         DIN 13-3, DIN 519 (avoid)
 o  M12.5x0.5         lens mounting ring, for 12mm-dia lens mounts, eg. Thorlabs
    M12.5x0.5         on some circular connectors
@   M12.5x0.75        DIN 13-4
    M12.5x0.75        panel nut, on some fuse holders
 %  M12.5x0.9         on FNT Professional Airless Spray gun, Titan Wagner
@   M12.5x1           DIN 13-5
 t  M12.5x1.25        on some adjustable reamers (Beck)
====Pg-7              12.5-20, 12.5x1.27, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG7               cable glands for up to 7mm cable
@   M12.5x1.5         DIN 516 (avoid)
H   M12.5x1.75        US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; not in ISO series, close to 1/2"
H   12.5x2.0          Armengaud thread, V-thread, 76° (later 55°), historical
    S12.65x1.5        pressure test point, manometer attachment diagnostic nipple, "Test 12" standard, used by Kawasaki, Schwing
*   1/2" GAS          ...see 0.515-27
*   1/2" copper       ...see 0.639-20, W16.23x1.27
*   1/2" NPSH         ...see 0.825-14, M20.96x1.814
*   1/2" BSP          ...see G1/2, W 13/16-14 W20.64x1.81
*   1/2" NPT          ...see 27/32-14, M21.34x1.81
*   1/2 JIC           ...see 3/4-16; fittings/tubes, dash size -8, nominal inner dia 1/2"
=====00000 BWG        5/0 BWG, Birmingham Wire Gauge, Stubbs Gauge, 0.500", 12.70mm
=====0000000 SWG      7/0 SWG, British Standard Wire Gauge, 0.500", 12.700mm
=====0000000 USG      7/0 USG, US standard gauge for sheet plate steel, 15 US Code sec.206, 1/2", 0.500", 12.7mm
===== 3/8" Cu pipe    3/8" 9.525mm nominal bore, 1/2" 12.70mm outer diameter pipe; ASTM B88 type K/0.049"/1.24mm, L/0.035"/0.889mm, M/0.025"/0.635mm; plumbing copper pipe in USA/Canada
===== 1/2" Cu tube    DN15, 12.70mm outer-diameter tube; AS 1432 wall thick 1.02mm/19g (A/green, 6.10 MPa, also bendable), 0.91mm/20g (B/blue, 5.29MPa, also bendable), 0.71mm/22g (C/red, 4.07 MPa, also bendable); AS/NZS 1571, wall thick 0.71mm (4.34 MPa), 0.81mm (4.99 MPa), 0.91mm (5.65 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
@   1/2-80
@   1/2-72
@   1/2-64
@   1/2-60
@   1/2-56
@   1/2-48 UNS
 o  1/2-48 UNS        lens mount, US standard series, male on lens, PH3.10
    1/2-48 UNS        actuating screw in some NATO aircraft (C-7a)
@   1/2-40 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
@   1/2-40 WS         Whitworth Special
====1/2-40 UNS        NS, UNS (H28 1963)
    1/2-40 UNS        some locknuts, rare
@   1/2-36            UNS (H28 1963)
 w  1/2-36            firearm barrel end thread, common at 9mm cal; Troy M5 PCC carbine, AR-15 (9mm), M-16 (9mm), AR-180 (9mm) Colt AR 9mm, some Diamondback 9mm PCC carbine, CMMG Wasp 9mm
 w  0.500-36          (M12.7x0.706)  firearm revolver barrel/frame thread; J Frame
@   1/2-32 ME         Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
====1/2-32 UN         32UN, 32-thread, primary size, constant pitch series, NS, UN (H28 1963)
    1/2-32            panel nuts
====13v2              tire valve, ISO 4570-3, 12.7x0.794 (1/2-32)
@   1/2-30
 w  1/2-30            firearm barrel end thread, factory Heckler-Koch MP5-N (9mm)
=== 1/2(-28) UNEF     M12.7x0.907, primary size, 28UN, SAE extra fine (1915/1926), NS, UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
 C  0.500-28 UNEF     circular connectors, MIL-DTL-5015; size 8S, coupling (J) (0.5-20 UNF for accessory)
    1/2-28            sewing machines, Singer tap TE166, alternative 1/2-28 UNEF
!w  1/2-28 UNEF       barrel end thread, most common at 9mm cal, .223 (5.56 NATO), .22 LR, .22 MAG, .17 HMR, 5.56 == .223; standard AR-15 (.223), M16 (.223), AR-180 (.223), older CZ EVO Scorpio (9mm), Ruger 10/22 Tactical (.22), newer Mini 14 (.223), MPA57 (5.7x28), MPA Mini (9mm)
 w  1/2-28 UNEF       firearms, common .22LR gun/pistol silencers, US standard (also 1/2-20); Walther PPQ M2 NAVY, Beretta M9A3
*   1/2-27 GAS        ...see 0.515-27
====1/2-27 UNS        NS; 27-thread series, fine threads for thin-wall tubing; "27N", NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  1/2-27            faucet aerators, uncommon
 %  1/2-27            some faucet seats; Indiana Brass, Kohler, Eljer
    1/2-27            in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
@   1/2(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; common size?; size also used in Germany
 S  1/2-26            on lamps, lightbulb socket bases; hollow tubes for wires; on lamp hooks, lampholders; common in UK, alternative to M10x1
@   1/2-26 ME         Model Engineer, Whitworth-based, 55°, est.1912; standard series; some model boiler fittings, rare
H   1/2-26 CEI        Original Cycle, British bicycles, 60°, historical
@   1/2-26 BSC        British Standard Cycle, CEI, bicycles; also as LH; bolts and nuts
T   1/2-26 BSC        basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
@   1/2-26 NS
    1/2-26            some speedo-tacho drive cable nuts
@   1/2-25 NS
    1/2-25            on some gas heating welding tips, Harris/Lincoln Electric?
@   1/2-24 WS         Whitworth Special, Whitform
====1/2-24 UNS        NS; UNS (H28 1963), ASME B1.1-2003 Appendix D, Sellers
 %  1/2-24            tube coupling, 5/16" tube, standard compression fitting with ferrule
 %  1/2-24 UNS        on some gas plug orifices, nozzles
 %  1/2-24            some faucet seats; Sterling, Streamway, Briggs, Central Brass
    1/2-24            in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    1/2-24            panel nuts
*   1/2-20 copper     ...see 0.639-20, W16.23x1.27
*   1/2-20 STI        ...see 0.5650-20, 14.4x1.27 (screw thread insert)
H   1/2(-20) ADMF     Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 12.7x1.270
H   1/2-20 BSW cyc    British Whitworth cycle
@   1/2-20 WS         Whitworth Special, Whitform
@   1/2-20 BSC        British Standard Cycle, CEI20, bicycles; also as LH; (not in Guide to World Screw Threads)
@   BC 1/2-20         BC1/2, 12.70x1.27, bicycle thread, pedal shaft (LH/RH, gear crank (LH/RH); also BC 9/16; JIS B 0225
=== 1/2(-20) UNF      M12.7x1.27, primary size, screw "N" (US), 20UN, ALAM automobile standard (Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF (B1.1-1935), UNF (H28 1950/1957), UNF/UN (H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
c   1/2-20 UN         UNF standard; 20UN, 20-thread, primary size, constant pitch series
    AN8               aircraft bolts, 1/2-20 UNF-3A; AN28, clevis bolt; AN78, drilled head; AN178, close tolerance, less common; AN48, eye bolt
 %  1/2-20 UNF        Swagelok fittings; series 500, 5/16" tubes; 8mm tubes, 1/4" tubes
 %  1/2-20            tube coupling, 5/16" tube, standard flare fitting
 %  1/2-20            tube coupling, 5/16 ("-5"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  1/2-20            tube coupling, 5/16 ("-5"), SAE 45-deg flare (SAE J512), flare male on male, SAE 45-deg inverted flare
 %  1/2-20            tube coupling, 5/16 ("-5"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  1/2-20            tube coupling, 5/16 ("-5"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  1/2-20            tube coupling, 5/16 ("-5"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  1/2-20            JIC tube fittings, for 1/4 tube, common
 %  1/2-20 UNF        ports in scientific apparatus vessels; according to: SAEJ1926, SAEJ514; AS5202 (for UNJF)
 %  1/2-20 UNF        hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  1/2-20 UNF        fire extinguishers, outlet thread, female on valve, 6-12kg ones, much less common than M14x1.5
 g  1/2-20 UNF        medical gas rail outlets, oxygen
 g  1/2-20 UNF        SCUBA diving regulators, first stage output, female on regulator (hose to 9/16-18 second stage input); less common than 3/8-24 UNF
 g  1/2 UNF           diving regulators, some low-pressure ports
 g  1/2-20 UNF        air valve; common on pressure tanks
 g  1/2-20 UNF        CO2/N2O cartridges, refillable, larger, male on cartridge; 33g, 38g, 65g, 88g CO2
 g  8/16-20 LH        car air conditioning refrigerant coupling, US EPA standard, GHG-X5/Autofrost X5, high side port; R-406A/GHG-12/GHG-X3/McCool, small cans; R-416A/FRIGC FR-12/HCFC Blend Beta, 30-lb cylinders
 %  1/2-20 UNF        on vehicle braking systems, brake master cylinder thread, SAE
 %  1/2-20 UNF        grease fitting nipples, "zerk", US; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 %  1/2-20            carburetor inlet fittings, less common than 7/8-20
 %  1/2-20 UNF        on some industrial drum faucets/taps/spouts, female on faucet, for hose extensions; less common than 13/16-27 UNF
 %  1/2-20            some faucet seats; American Brass, American Standard, Crane, Price Pfister, Streamway, Eljer, Sayco
!t  1/2-20 UNF        chuck mount thread, bigger drill chucks
 h  0.500-20          antique geodetic/surveying gear, pre-standard, male on tripod; C.L. Berger & Sons farm levels and transit levels
    1/2-20            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
    1/2-20            bicycle crank arm pedal thread, one-piece or BMX crank (LH,RH thread pair) (UNF or BSC?)
    1/2-20            on bicycles, pedals; LH+RH, in USA, and Fauber brand (BSC or also BSC?)
 t  1/2-20            rotary tool arbors, common for hole saw to shank attachment (also 5/8-18, 1/4-20), male on arbor; very common
    1/2-20 UNF        car wheel nuts; SAE/US standard; very common
    1/2-20 UNF        semiconductor packaging, stud-mounted diodes/SCRs; typ. DO-205AC, DO-30, TO-209; also M12
    1/2-20 UNF        threaded-body industrial proximity sensors, eg. induction or photoelectric
    1/2-20            panel nuts
    1/2-20            circular connectors, MIL-DTL-5015; size 10SL, fitting (Conxall)
    0.500-20 UNF      circular connectors, MIL-DTL-5015; size 8S, accessory (H) (0.5-28 UNEF for coupling)
    0.500-20 UNF      circular connectors, MIL-DTL-83723; size 8, shell/accessory
 w  1/2-20            firearm barrel end thread, Tec 22 (.22), CZ-452/455 (.22/17 HMR)
 w  1/2-20 UNF        firearms, common .22LR gun/pistol silencers, European standard (also 1/2-28)
====13v1              tire valve, ISO 4570-2, 12.6x1.270 (20 tpi), .500-20
 g  13V1              large-bore OTR valves on tires, internal thread in stem; for external thread see 17V2; some 12V1/8V1 valve mounting bases; see also 8V1/5V1, 12V1/9V1, 12V1/8V1
@   0.5-20 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   ET1/2(-18)        W1/2-18, B.S. electrical conduit thread, BS Con, BS 949, Whitworth, 55°, less common
    W1/2-18           on some British magnifying lamps
====1/2-18 UNS        NS, UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  1/2-18            some faucet seats; Union Brass
 g  8/16-18           car air conditioning refrigerant coupling, US EPA standard, Freeze 12, low side port, 30-lb cylinders
 g  8/16-18 LH        car air conditioning refrigerant coupling, US EPA standard, SP34E, low side port, 30-lb cylinders
 w  1/2-18            firearm barrel end thread, rarely seen
    1/2-18            some threaded rods
@   1/2-16 TWF        Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====1/2(-16) BSF      British Whitworth Fine-pitch; W12.70x1.588; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "N" (UK)
====1/2-16 UN         16UN, 16-thread, primary size, constant pitch series, NS, UN (H28 1963); originally for adjusting collars, retaining nuts
 g  8/16-16 LH        car air conditioning refrigerant coupling, US EPA standard, HFO-1234yf, 30-lb cylinders
 h  0.500-16          antique geodetic/surveying gear, pre-standard, male on tripod
 h  1/2-16            some antique lathe turrets
L   1/2-16 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; on some woodworking lathes, on Delta (and other) shapers 1/2" spindles
 g  8/16-16 ACME      1/2-16 ACME; "1/2 ACME"; car air conditioning refrigerant coupling, US EPA standard, HFC-134a, 30lb cylinders, small cans
@   0.5-16 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
====1/2-14 UNS        NS, UNS (H28 1963), ASME B1.1-2003 Appendix D, "14N"
 %  1/2-14            tube coupling, JIS 300, 1/2 ("-8"), tapered, or 30-deg male flare on male
*   1/2-14 BSP        ...see G1/2, W 13/16-14 W20.64x1.81
*   1/2-14 NPT        ...see 27/32-14, M21.34x1.81
H   0.5-13.09         Holtzapffel & Co. (1856), historical; 12.7x1.94; tap/die "E", comb-screw tool no.4, mandrel guide no.2
*   1/2-13 STI        ...see 0.5999-13, 15.2x1.95 (screw thread insert)
H   1/2-13            stove bolt series, "SB", manufacturer standard, USA
H   1/2-13            Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1/2(-13) UNC      M12.70x1.95, primary size, UNJC, Sellers (1864), USS (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935/1949, H28 1950), UNC (H28 1957, H28 1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
 g  8/16-13           car air conditioning refrigerant coupling, US EPA standard, FreeZone/HCFC blend Delta, high side port
 g  1/2-13            LPG/propane/butane connection, female on bottle; SAEF 1/2"
!S  1/2-13 UNC        thread on stands and rods for fishing, larger size
 t  1/2-13            collet chuck drawbar end on straight-shank ER32/ER40, Morse-taper MT3 ER32/ER40, NST-shank ER32/ER40
    1/2-13            car engines, Chrysler 318-340 HB, 6.9 and 7.3 Int. MB, K Cat 32
    1/2-13            on cars, standard bumper bolts (3/8-16, 7/16-14, 1/2-13)
    1/2-13            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
    1/2-13            car wheel nuts
    1/2-13 UNC        on crane hooks; minimum size for #2 hook/crane, workload limit .90 tons (Crosby/Bullard)
    1/2-13            thread insert, external thread; keylocking and EZ-Lok steel thinwall, 3/8-24, 3/8-16; keylocking heavy duty and EZ-Lok steel, 5/16-24, 5/16-18; EZ-Lok steel, M8x1.25; keylocking extra heavy duty and EZ-Lok steel extra heavy, 1/4-20
s   1/2-13            self-tapping screws type F, type 1; ANSI B18.6.4
s   1/2-13            thread-rolling screws, Taptite style, machine thread; for drilled, punched or corred holes in ductile and punch extruded metals
 h  0.500-13          antique geodetic/surveying gear, pre-standard, male on tripod; C.L. Berger & Sons, 1st issue military tilting level tripod, 2nd issue was 5/8-11
H   0.500-12          Whitworth thread proposal, 1857 (replaces 1/2-12 designation from 1841)
@   1/2-12 TWC        Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1/2(-12) BSW      British Standard Whitworth; W12.70x2.117; 55°; also "continental Whitworth"; 1/2W12 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919; also LH
 %  1/2-12 BSW        grease fitting nipples, "zerk", British; see also UNF1/4, UNF5/16, UNF3/8, UNF1/2, UNS7/16-27, BSW1/4, BSW3/8, BSW5/16, BSW1/2, BSF3/16, BSF1/4, BSF5/16, BSF3/8
 S  1/2 BSW           on lamps, stage lighting suspension bolts, for heavier luminaires (eg. Australia); also 3/8 BSW
    1/2-12 BSW        stems on some caster wheels, furniture stands/feet; metric alternative is M12
    1/2-12 BSW        older British oil switchgear, round copper stud connection to main contacts
H   1/2-12            CUES Ottawa 1945 proposal as UNC (but not taken up by the industry, so changed back to 1/2-13)
H   1/2-12            sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   1/2-12            taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====1/2-12 UNS        NS, 12AN, V.St'd (Machinists Handbook 1909), AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1957), NC - old US standard (changed to 1/2-13 since year 1911 or 1906 or so), UNC (B1.1-1949, H28 1950), UNS (H28 1963), ASME B1.1-2003 Appendix D
i   1/2-12 UNC        specified as coarse at American-British-Canadian conference in 1945, Ottawa, as a concession to British practice; US industry did not follow; in 1950 Brits informally suggested reconsideration, 1/2-13 adopted internationally; 1st and 2nd printing of B1.1-1949 lists 1/2-12 as UNC and 1/2-13 as NC, 3rd printing set back to 1/2-13 and 1/2-12 delegated to specials (Standardization, vol.22-23, Jan 1952)
    1/2-12            planer head bolts and nuts (Machinists Handbook 1909)
@   0.5-12 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   1/2-11
@   1/2-10
L   1/2-10 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; common on lathes, gives 0.1" per turn; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G; very common
L   1/2-10 square     leadscrew, on early Hardinge lathes
@   1/2-8             wooden thread, 60-deg V-thread, usual pitch (US tools - Bealltool, German tools), diameter similar to 13mm (see also 3/4-6, 1-6)
L   1/2-8 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   1/2-7             Cordeaux thread, approx. Whitworth, patented in 1877; for connecting porcelain insulators to stalks; BS 16-1937, in Britain/NZ/Australia; also 5/8 almost universally for telegraph lines, 3/4 for some bigger insulators; nonstandard size? (not in Guide to World Screw Threads)
s   1/2-6             self-tapping screws, W.T. type A
W   1/2-6             coach and lag screws (Machinists Handbook 1909, modern), dowel screws
L   1/2-2             ballscrew, for leadscrews
@   W0.502-24
@   0.5025-20         STI-7/16-20, 12.8x1.27; screw thread insert thread, ASME B18.29.1
H   12.8x1.880        FS -6, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -6, 0.5039-13.5
=====#34 screw        wood/machine screw gage; 0.50528" 12.8341mm (American Screw Co. old standard)
@   M13x0.35          DIN 13-2
 o  M13x0.35          lens mount, uncommon
@   M13x0.5           DIN 13-3, DIN 519 (3rd)
 o  M13x0.5           some diode laser housings; also M11x0.5, M12x0.5
@   M13x0.75          DIN 13-4
 o  M13x0.75          lens mount, standard for clamp-on accessory lenses for smartphone cameras
    M13x0.75          cable clamp nut on RM12 connector, cord clamps sleeve nuts
 t  M13x0.75          ERM11 mini collet nut
 w  M13x0.75          firearm barrel end thread, male on barrel, on Browning Hells Canyon Speed rifle in .30-06
    M13x0.8x3         triple-lead, some fountain pens, pen cap
@   M13x1             DIN 13-5
 o  M13x1             lens mount, uncommon; board cameras; in machine vision; JIIA image size class II
 %  M13x1             compression fitting, 8mm tube: metric Norgren/Enots
    M13x1             fountain pens, common cap thread
    M13x1x3           fountain pens, larger (14mm) cap thread, triple-start
    M13x1             base thread for lightbulb sockets, uncommon (also M8x1, M10x1, M16x1); hollow tube for wires
 w  M13x1             firearm barrel end thread, Galil (.223, .308), older Glock 26 (9x19mm)
 w  M13x1 LH          firearm barrel end thread, Steyr Aug (5.56)
 w  M13x1 LH          WW2 German artillery fuze, Bd.Z.1513, in grenade base, for AP 2cm aircraft gun shells
@   M13x1.25
 w  M13x1.25          firearm barrel end thread, male on barrel, on Browning X-bolt Hells Canyon Speed
 p  M13x1.25          on packaging tubes; uncommon
H   13x1.471          Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   M13x1.5           DIN 13-6, DIN 516, "ISO-other"
 %  M13x1.5           brake master cylinder thread, metric (TN30)
    M13x1.5           car oil pan drain plugs, common size
 p  M13x1.5           on packaging tubes; "M13"; ordinary-size tubes, common?
T   M13x1.5           in common tap-insert sets for vehicle oil plug thread repairs (M13x1.5, M15x1.5, M17x1.5, M20x1.5, M24x1.5)
@   M13x1.75
@   M13x2             "ISO-other"
 p  13-12             glass bottle thread, British, BS 1918:1953; R-4 finish; round 60°, main dia 12.9mm, depth 0.762mm, bump radius 0.559mm, bump base radius max.0.305mm, bump base width 1.52mm
 p  SP13(-12)         13SP, glass/plastic bottle thread, SP-415,425; 13-415, 13-425; small vials, 13-425 chromatography vials Wisp; 15x45mm 4mL vials, 15mm-dia (less common 17mm dia) vials; 13-415 common on e-liquid bottles
 p  S13x2.12          on packaging tubes; sawtooth thread; mostly on toothpaste tubes, VERY common; 12tpi; on 35mm-dia tubes
@   0.514(-20)        BS copper pipe thread, BScopper, 3/8" inner dia; W13.05x1.27
H   13.07x1.0160      Mechaniker thread no.2, 25 tpi, 52° (size-specific); Siemens-Halske, German, in use until 1925, historical
@   0.515-27          gas (brass pipe) thread, size 1/2", 13.081x0.941; 27-thread series, fine threads for thin-wall tubing
 %  33/64-18          some faucet seats
@   33/64-13 UNS
    33/64-13          M13.1x1.95; oversized 1/2-13 UNC; on some guywire eye nuts, thimbleyes, twineyes
@   17/32-40 NS
    17/32-40 NS       locknut on some pneumatic valves
 w  17/32-40 NS       on some revolvers; Dan Wesson Model 14, .357 Revolver, threads on the frame
@   17/32-24
 g  17/32-24          tube coupling, brake thread ("-6"), 3/8" tube, sleeve nuts on tubes;, in truck air brakes
 %  17/32-24          aerator on Master Plumber Q970 drinking fountain bubbler
 %  17/32-24          some bathroom faucet seats, eg. Universal Rundle, Mueller
@   1/4-19 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
==  G1/4(-19)         G13.157x1.337, W.518-19, ~W 33/64-19, W13.157x1.34, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 %  G1/4              on flareless tube fittings, for 6 mm, 8 mm tube
 %  G1/4              compression fitting, 1/4" tube, 5/16" tube: imperial WADE
 %  1/4-19 BSPP       on hydraulic pipes with outer dia approx. 17/32"
 %  G1/4              hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  G1/4              hydraulic test points, construction vehicles, Hitachi, Kobelco
 %  G1/4              grease fitting nipples, "zerk", British; parallel; common; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 %  R1/4              grease fitting nipples, "zerk", British; tapered; common; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 %  1/4-19 BSP        motorbikes, gas tank pet cock threads, parallel
 %  G1/4-19           fire extinguishers, outlet thread, female on valve, 2-12 kg ones, less common than M14x1.5
 %  G1/4-19           fire extinguishers, dip tube on CO2 ones, uncommon (see M10x1 for standard), female on valve
 g  G1/4              gas bottle valve thread, AS 2473.2 Type 33 (Australia/NZ), male on bottle; nontoxic, nonflammable, small bottles below 4.5l water
 w  G1/4              on some pyrotechnic gas generators (M16x1.5, G1/8, G1/4, G3/8; M11x1; 3/8-24)
T   1/4-19 BSP        basic BSC/CEI tap/die set for bike work (2BA, 1/4-26, 5/16-26, 3/8-26, 7/16-26. 1/2-26, 1/4-19 BSP)
T   1/4-19 BSP        assorted British tap/die set (3/16-32,24 1/4-26,20 5/16-26,22,18 3/8-26,20,16 1/8-28BSP 1/4-19BSP 0BA 1BA 2BA 4BA)
=====#35 screw        wood/machine screw gage; 0.51844" 13.1684mm (American Screw Co. old standard)
 o  M13.25x0.5        optical filter, outer dia usual 14.4   aperture usual 10.6
H   0.525-12          Whitworth thread proposal, 1857
@   M13.5x0.35        DIN 13-2
@   M13.5x0.5         DIN 13-3, DIN 519 (avoid)
 o  M13.5x0.5         some lens mounting rings, for 13mm-dia lens mounts, eg. Thorlabs
@o  0.5313-36 NS      13.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M13.5x0.75        DIN 13-4
 o  M13.5x0.75        some lens mounting rings, eg. in laser optics
 %  M13.5x0.75        on push-fit tube couplers, R26 cartridge slots for 8mm dia
@   M13.5x1           DIN 13-5
 w  M13.5x1 LH        firearm barrel end thread, Heckler-Koch 9mm (P30, SFP9), Beretta APX, Sig Sauer P228/P229/P239 (9mm), Glock 17 (gen.3,4,5), Glock 19 (gen.3,4,5), all Glock 9mm except G43
@   M13.5x1.5         DIN 516 (avoid)
@   0.5303-14         STI-7/16-14, 13.5x1.81; screw thread insert thread, ASME B18.29.1
=====#36 screw        wood/machine screw gage; 0.53160" 13.5026mm (American Screw Co. old standard)
    35/64-20 LH       sewing machines, Singer tap TE320
====0.535-40          M13.59x0.635, Thorlabs SM05
 o  0.535-40          lens mount, 13.59x0.635, 1/2"-tubes, Thorlabs SM05
=====1/4" pipe        0.540 in, 13.716 mm outer diameter, DN 10, NPS 1/4, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 8mm, ASTM copper tube 10mm; ASTM B42 copper B43 red brass, wall th 0.082"/2.08mm standard, 0.123"/3.12mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
 w  0.540-36          17/32-18, M13.72x0.706; firearm revolver barrel/frame thread; K Frame
=== NPT 1/4(-18)      0.5343-18, ~17/32-18, M13.571x1.41; ANPT; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 g  1/4-18 NGT        gas bottle neck thread, female on bottle, taper 1:16; CGA V-1, SI no. 1b; also per IS:12300 for refrigerant valves
 g  1/4 NPT           on oxygen systems; seen as female adapter to 9/16-28 male
 g  1/4-18 NPT        air valve, on high pressure tanks
 %  1/4-18 NPTF       hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  1/4 NPT           grease fitting nipples, "zerk", US; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 %  1/4-18 NPT        common on manometers, "SAE 1/4", common in USA; also 7/16-20 UNF, 1/2 NPT
 %  1/4-18 NPTF       car engine sensor port, oil pressure; Ford
 %  1/4-18 NPT        cable gland, NPT-14  cable 3..6.5
 %  1/4-18 NPT?       faucet aerators, uncommon, male or female on faucet
 %  1/4 NPT           common on dispenser tips for IDS dispensing cartridges, dispensing needles; female on cartridge, industry standard (also M15x1.5)
 S  1/4 IPS           on lamps; residential ceiling fixtures, floor lamps, alternative to 1/8 IPS with extra strength; hollow tube to lead the wires through
 S  1/4 IP            common architectural suspension systems, typ. for 1/16" 1.59mm, 3/32" 2.38mm cable, 3/32" 2.38mm (side, female thread)
    1/4-18 NPT        flame rods
=====#37 screw        wood/machine screw gage; 0.54476" 13.8369mm (American Screw Co. old standard)
H   0.550-12          Whitworth thread proposal, 1857
===== 14mm Cu tube    14mm outer-dia tube; EN 1057, wall th 0.8,1.0mm; unusual size
@   M14x0.35          DIN 13-2
====M14x0.5           ISO extended, DIN 13-3, DIN 519 (2st), GOST 9150-59 constant, GOST 24705-81
 o  M14x0.5           lens mount, similar to M12x0.5, "M14", uncommon, eg. on IMX290/OV4689/OV2718; some thermal lenses
====M14x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
!t  M14x0.75          chuck mount thread, ER11 collet nut, on one OmioCNC spindle
 C  M14x0.75          panel nut on RM12 panel connector, glass fuse holders, Hirose HR10A 20-pin connectors, PC-10 type circular connectors, RS10 connectors panel+sleeve nut
    M14x0.75          some car roof antennas (Skoda)
    M14x0.75          some laser nozzles
    M14x0.8x3         fountain pens, triple-lead, common cap thread
@   .5512(-26) BSB    W14x0.977; British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances, secondary size?
=== M14x1             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M14x1             10mm tubing sleeve nut
 t  M14x1             chuck mount thread, eg. some Chinese woodturning lathes (50mm, 65mm) (see M14x1, M25x1, M44x1, M67x1)
 t  M14x1             on some tooling collets; internal thread in shank of a mini-ER20 collet, ER DIN 6499
    M14x1             threaded-body industrial proximity sensors, eg. induction or photoelectric
    M14x1             panel nut, on some 10mm-dia LED panel holders
    M14x1             fountain pens, common cap thread
    M14x1             on bicycles; oversized frestyle axles
 w  M14x1             firearm barrel end thread, male on barrel, most Oberland Arms AR15 (?), VZ58 (7.62x39), AK-47 (7.62x39), Yugo SKS (7.62x39), "AK-type commie firearms"
 w  M14x1             common airsoft barrel thread (also M14x1 LH)
!w  M14x1 LH          barrel end thread, male on barrel, AK-47 (.308), common accessories
 w  M14x1 LH          common airsoft barrel thread (also M14x1)
T   M14x1             present in AUTO-1, AUTO-2, N3-II, GEKO G38300 thread cutting set
=== M14x1.25          ISO 261 2nd, ISO secondary fine (only for spark plugs), BS 3643-1:1981 2nd constant, "series F" (TM 9-254, 1958), GOST 9150-59 constant, GOST 24705-81
 g  M14x1.25 LH       car air conditioning refrigerant coupling, US EPA standard, R-414A/GHG-X4/HCFC Blend Xi/McCool Chill It, small cans
 g  M14x1.25          medical gas rail outlets, air
 g  M14x1.25          some disposable CO2 cartridges, 24..150 grams, Essmann/Jet
 %  M14x1.25          fire extinguishers, outlet thread, female on valve, much less common than M14x1.5
    M14x1.25          spark plug thread, "M14", common (other common is M18x1.5); British BS 45:1972; SAE standard
    M14x1.25          industrial igniters (also SAE), flamerods
    M14x1.25          boiler water level probes
    M14x1.25          car oil pan drain, less common
    M14x1.25          pneumatic cylinder
    M14x1.25          car wheel nuts, bolts
    M14x1.25          on bicycles, pedals; LH+RH, rare French pedals
T   M14x1.25          present in AUTO-1, AUTO-2, N3-II, GEKO G38300 thread cutting set
H   .5512(-20) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; less common size
=== M14x1.5           common; ISO 261 2nd, ISO secondary fine, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, JIS B 0211, MJ, DIN fine, French automobile (Pas Fin), JIS, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M14x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
    M14x1.5           common finer alternative to M14x2 thread on bolts
 g  M14x1.5           LPG/propane/butane connection, female on interface; Primus (G.32) (according to EN 15202)
 %  M14x1.5           metric pipe thread DIN 7631
 %  M14x1.5           some tubing systems, e.g. in plastic industry, DN 6 (also M10x1, M16x1.5), DN 9 (also M16x1.5)
 %  M14x1.5           tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer; M14x1.5 size recommended for diagnostic ports
 %  M14x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M14x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 8mm tube (light),   6mm tube (heavy)
 %  M14x1.5           tube coupling, 8mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M14x1.5           tube coupling, Komatsu equipment, 30-deg cone (male cone on male)
 %  M14x1.5           tube coupling, French millimetric 24-deg seat, 8mm tube
 %  M14x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 8mm tube; DIN "L", 8mm tube; Russian heavy, 6mm tube; DIN "S", 6mm tube
 %  M14x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 8mm tube; type J (39.2 MPa), 6mm tube
 %  M14x1.5           tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 8mm tube; O-ring face seal (JB1887), 6mm tube
 %  M14x1.5           on flareless tube fittings, for 8 mm tube
 %  M14x1.5           hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  M14x1.5           hydraulic test points, construction vehicles, Hitachi
 %  M14x1.5           ISO 6149 hydraulic ports
 %  M14x1.5           car engine sensor port, oil pressure; Alfa Romeo, Fiat, Lada, Nissan, Renault, Volvo
 %  M14x1.5           car engine sensor port, oil temperature; Audi, Ford, Mazda, Mitsubishi, Opel, Porsche, Saab
 %  M14x1.5           car engine sensor port, water temperature; BMW, Mercedes, Porsche, Volkswagen
 %  M14x1.5           on oil filters; lube; rare
 %  M14x1.5           grease fitting nipples, "zerk", metric; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M14x1.5           found on vehicle braking systems
 %  M14x1.5           fire extinguishers, outlet thread, female on valve, very common; also M14x1.25
 %  M14x1.5           fire extinguishers, dip tube, female on valve; less common than M16x1.5
 %  M14x1.5 LH        waterjet cleaner nozzles
 S  M14x1.5           on lamps, tubes for wires; less common than M10x1, M8x1
    M14x1.5           ceramic TIG welding torch nozzle sleeves, female on sleeve
    M14x1.5           some laser cutting nozzles, male on nozzle; less common than M11
    M14x1.5           car oil pan drain
    M14x1.5           car wheel nuts, bolts; very common
    M14x1.5           compressor oil sight
 t  M14x1.5           rotary tools - backing pads for fibre discs, less common than M14x2
 t  M14x1.5           smaller lathe chucks; Cowells 90
    M14x1.5           on outside of bulkhad push-in tube couplers, 6mm tube
    M14x1.5           thread insert, external thread; keylocking thinwall, M10x1.25, M10x1.5; keylocking heavy duty, M8x1, M8x1.25
 p  M14x1.5           on packaging tubes; uncommon
T   M14x1.5           present in AUTO-1, AUTO-2, N3-II, GEKO G38300 thread cutting set
H   14x1.724          Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   M14x1.75          "ISO-other"
H   Lh14x1.8          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   14x1.8 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
*   M14x2 STI         ...see 16.598x2 (screw thread insert)
H   14x2              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   14x2              S.F. No.2, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
=== M14(x2)           M14; common; "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M14               hex head wrench size: 21 (ANSI/ISO), 22 (DIN), 19 (JIS)
    M14               DIN hex bolts have 1mm wider across-flats distance than ISO/ASME; for M10, M12, M14
    M14               on chainsaw gearwheels, also M10, M16
    M14x2             car engines, Navistar 6.0 L outer MB, Navistar 6.0 L inner MB
    M14x2             car wheel nuts; common
 t  M14               velcro sandpaper holder tool shaft, rotary wire brush tools, rubber sandpaper backing pads, central nut on many angle grinders, common
 t  M14(x2)           rotary power tools - metric standard, see also 5/8-11; male on arbor; most common on european angle grinders; wire brushes, sanding backing plates/grip plates...; 115,125,178mm discs
T   M14x2             present in GEKO G38300 thread cutting set
@   S14x2             buttress thread, fine, 33°, DIN 514
L   Tr14x2            trapezoidal fine, 30°, DIN 103; for leadscrews
H   W14x1/12"         Whitworth Fine Thread DIN 30284, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  14-12             glass bottle thread, British, BS 1918:1953; R-4 finish; round 60°, main dia 13.6mm, depth 0.762mm, bump radius 0.559mm, bump base radius max.0.305mm, bump base width 1.52mm
 p  S14x2.12          S14-12, on packaging tubes; sawtooth thread; uncommon
 p  GL14(x2.5)        on glass containers, knuckle thread DIN 168; 60° internal, 30° external; common on lab glassware, multiport attachments to bottles; tubes 0.8..6.35mm, aperture 9.2mm, wrench 17mm; on 12mm glass tubes
 p  KS14(x2.5)        for plastic containers,    buttress thread DIN 6063-1, 40-deg
 p  KT14(x2.5)        for plastic containers, trapezoidal thread DIN 6063-2
@   E14(-9)           Edison thread (E thread DIN 40400), 13.5mm, 9tpi (2.82mm); lightbulbs, some fuse holders, Small or Mignon (SES), European; 230 V candelabra/chandelier, night lamps, and some pendant lights; BS 98:1962, "Small"; very common in UK, Europe
@   S14x3             buttress thread, coarse, 33°, DIN 513
 p  14x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
L   Tr14x3            trapezoidal coarse, 30°, DIN 103; for leadscrews
@   Rd14(x3)          round/knuckle thread, DIN 20400
@   Rd14(-8)          round/knuckle thread, DIN 405
L   Tr14(x4)          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 p  S14x4.24          on packaging tubes; sawtooth thread; uncommon
 p  Tr14x6            on packaging tubes; uncommon
=====#38 screw        wood/machine screw gage; 0.55792" 14.1712mm (American Screw Co. old standard)
H   0.56-13.09        Holtzapffel & Co. (1856), historical; 14.22x1.94; tap/die "D", comb-screw tool no.4, mandrel guide no.2
@   14.274x1.75       STI-M12x1.75, screw thread insert thread, DIN 8140-2
*   9/16" GAS         ...see 0.578-27
@   9/16-48
@   9/16-40           UNS (H28 1963)
    9/16-40           seen on some Silencer dental drills
@   9/16-36           UNS (H28 1963)
 w  9/16-36           firearm barrel end thread, seen on some 9mm Glocks, rare
 w  0.562-36          (M14.27x0.706, 9/16-36) firearm revolver barrel/frame thread; L Frame
@   9/16-32 ME        Model Engineer, Whitworth-based, 55°, est.1912; not in standard series but also in use (Guide to World Screw Threads)
====9/16-32 UN        32UN, 32-thread, primary size, constant pitch series, UN (H28 1963)
 w  9/16-32           firearm barrel end thread, male on barrel; on some 9mm Glocks, for compensators
@   9/16-30
====9/16-28 UN        28UN, 28-thread, primary size, constant pitch series, UNJ, UN (H28 1963)
 g  9/16-28           on oxygen systems (?); seen as adapter male to 1/4 NPT female
 g  9/16-28 UN        medical gas rail outlets, nitrous oxide, vacuum
 w  9/16-28           firearm barrel end thread, male on barrel; on .40 S&W or .45 ACP, some .30 rifles (uncommon)
*   9/16-27 GAS       ...see 0.578-27
====9/16-27 UNS       NS; 27-thread series, fine threads for thin-wall tubing; "27N", NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  9/16-27           faucet aerators, female on faucet, uncommon
 %  9/16-27           some faucet seats; Indiana Brass
    9/16-27           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
@   9/16(-26) BSB     British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
H   9/16-26 CEI       Original Cycle, British bicycles, 60°, historical
@   9/16-26 BSC       British Standard Cycle, CEI, bicycles; also LH; bolts and nuts
=== 9/16(-24) UNEF    M14.29x1.058, primary size, SAE extra fine (1915/1926), UNJEF, ANEF (H28 1944), NEF (H28 1950/1957), UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
 %  9/16-24           tube coupling, 3/8" tube, standard compression fitting with ferrule
 %  0.563-24 UNEF     conduit fittings, MIL-PRF-24758-2, size J
 %  9/16-24           carburetor inlet fittings, common, less common than 7/8-20
 %  9/16-24           faucet aerators, female on faucet, uncommon
 %  9/16-24           some faucet seats, common
 %  9/16-24           some faucet seats
    0.5625-24 UNEF    9/16-24, circular connectors, MIL-DTL-38999; size 11, shell/accessory, code B, coupling is 0.750-10x3
 C  0.563-24 UNF      circular connectors, MIL-DTL-83723; size 8, coupling ("business end")
!w  9/16-24           firearm barrel end thread, most common at .40 cal; Ruger Mini (5.56), AR Grendel (6.50), older Mini 14 (.223), L1-a1 (.308), Glock 20 (10mm), HK94 (9x19mm), MP5 (9mm)
 w  9/16-24 LH        firearm barrel end thread, FN FAL (.308)
 %  9/16-22           some faucet seats
H   9/16(-20) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 14.111x1.270
@   9/16-20 WS        Whitworth Special, Whitform
@   9/16-20 BSC       British Standard Cycle, CEI20, bicycles; also as LH; (not in Guide to World Screw Threads); general use
@   BC 9/16-20        BC9/16, 14.29x1.27, bicycle thread, general use, pedal shaft (LH/RH), gear crank (LH/RH); also BC 1/2; JIS B 0225
@   Fg14.3(-20)       14.288x1.27, bicycle screw thread, 60°, DIN 79012; LH/RH, gear crank
    FG14.3            on bicycles, pedals; LH+RH, 9/16-20, "normal" pedals, British/ISO, most common
@   9/16SM20          German sewing machines, Ng, NN, DIN 5309 (Nahnorm 100), M14.29x1.27
====9/16-20 UN        20UN, 20-thread, primary size, constant pitch series, UNJ, UN (H28 1963)
 %  9/16-20 UN        Swagelok fittings; series 600, 3/8" tubes
 %  9/16-20 UNS       found on vehicle braking systems, brake master cylinder thread, SAE
 %  9/16-20           some faucet seats; Harcraft
    9/16-20 l+r       bicycle crank arm pedal thread, multipiece pedals (LH,RH thread pair); common on US bikes
    9/16-20           on bicycles; pedal threads, common three piece cranks (UNS? BSC?)
*   9/16-18 STI       ...see 0.6347-18, 16.1x1.41 (screw thread insert)
=== 9/16(-18) UNF     M14.29x1.411, primary size, screw "P" (US), ALAM automobile standard (Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF (B1.1-1935), UNF (H28 1950/1957, H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    AN9               aircraft bolts, 9/16- UNF-3A; AN29, clevis bolt; AN79, drilled head; AN179, close tolerance, less common; AN49, eye bolt
 %  6AN               9/16-18 fitting thread, usually with 37-deg flare; common on aviation and racing car fuel systems
 %  ORB-06            9/16-18 fitting thread, o-ring boss
 %  9/16-18 UNF       tube coupling, 3/8 ("-6"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  9/16-18           tube coupling, 3/8 ("-6"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  9/16-18           tube coupling, 1/4 ("-4"), O-ring face seal (ORFS, SAE J1453)
 %  9/16-18           tube coupling, 3/8 ("-6"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  9/16-18           JIC tube fittings, for 3/8 tube
 g  0.5625-18 UNF     9/16-18, gas bottle valve thread, CGA 022 (USA/Canada), male on bottle; oxygen, "B fitting", "B" nut, "size B" welding hoses (standard duty), up to 200 psig; H28 1942/1944 ("Class B")
 g  0.5625-18 UNF LH  9/16-18, gas bottle valve thread, CGA 023 (USA/Canada), male on bottle; fuel gases, "B fitting", "B" nut, "size B" welding hoses (standard duty), up to 200 psig; H28 1942/1944 ("Class B")
 g  9/16-18 UNF       gas bottle valve thread, CGA 170 (USA/Canada), female on bottle; small cylinders, noncorrosive - argon, helium
 g  9/16-18 UNF       medical gas rail outlets, nitrogen, vacuum
 g  9/16-18 UNF LH    medical gas rail outlets, oxygen
 g  9/16-18           Scott 9/16-18 aircraft oxygen system charging connection
 g  9/16-18           SCUBA diving regulators, input port on second stage, male on regulator (female nut on connection hose), standard
 g  9/16-18           car air conditioning refrigerant coupling, US EPA standard, FreeZone/HCFC blend Delta, low side port, 30-lb cylinders; R-420A, high side port, small cans
 g  9/16-18 LH        car air conditioning refrigerant coupling, US EPA standard, GHG-X5/Autofrost X5, low side port, 30-lb cylinders; R-420A, low side port, 30-lb cylinders
 %  9/16-18 UNF       fire extinguishers, outlet thread, female on valve, 2-12kg ones, much less common than M14x1.5
 %  9/16-18 UNF       ports in scientific apparatus vessels; according to: SAEJ1926, SAEJ514; AS5202, 6M152, AS1300, AS4201, PS10035 (for UNJF)
 %  9/16-18 UNF       hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  9/16-18 UNF       hydraulic test points, construction vehicles, Caterpillar
 %  9/16-18 UNF       found on vehicle braking systems, brake master cylinder thread, SAE
 %  6AN               carburetor inlet fittings, common, less common than 7/8-20
 %  9/16-18 UNF       waterjet sapphire nozzles, LH and RH thread
 %  9/16-18 UNF       on some gas plug orifices, nozzles
 %  9/16-18           some faucet seats; American Standard, Crane
    9/16-18           common on MIG welding torch gas nozzles, female on nozzle (also M11x1.5)
    9/16-18           car engines, DD 71 and 92 crankshaft
    9/16-18 UNF       car wheel nuts; SAE/US standard; common
    9/16-18           panel nuts
 h  0.562-18          antique geodetic/surveying gear, old Government Standard; standard thread on Johnson Head plane table tripods by various manufactures
@   9/16-16 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   9/16-(16) BSF     British Whitworth Fine-pitch; W14.29x1.588; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "P" (UK); also LH
====9/16-16 UN        16UN, 16-thread, primary size, constant pitch series, UN (H28 1963); originally for adjusting collars, retaining nuts
    9/16-16           on self-tapping threaded inserts for 3/8-16 and M10
@   9/16-14 UNS       UNS (H28 1963), ASME B1.1-2003 Appendix D, "14N"
@   9/16-13
*   9/16-12 STI       ...see 0.6708-12, 17x2.12 (screw thread insert)
@   9/16-12 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   9/16(-12) BSW     British Whitworth Standard; W14.29x2.12; 55°; secondary size, avoid if possible; 9/16W12 (former JIS B 0210); BS 84-1956 (secondary size, avoid if possible); in British Standards Interim Report 7270-1919
H   9/16-12           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   9.16-12           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in some lists
@   9/16-12           taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 9/16(-12) UNC     M14.29x2.117, primary size, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), 12UN, UNJC, ANC/AN (NSTC 1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC/N (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
c   9/16-12 UN        UNC standard; 12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
    9/16-12           planer head bolts and nuts (Machinists Handbook 1909)
    9/16-12           car engines, DD 53 series MB
    9/16-12 UNC       on crane hooks; minimum size for #3 hook/crane, workload limit 1.27 tons (Crosby/Bullard)
    9/16-12           thread insert, external thread; keylocking and EZ-Lok steel thinwall, 7/16-20, 7/16-14; keylocking heavy duty and EZ-Lok steel, 3/8-24, 3/8-16; EZ-Lok steel, M10x1.25, M10x1.5; keylocking extra heavy duty and EZ-Lok steel extra heavy, 5/16-18
 w  9/16-12           14.3mm, WW2 US MkII "Pineapple" grenade (8x5 segments), fuze and filling hole; WW1 MkI grenade (8x4 segments) fuze
 w  9/16-12 UNC-1A    ".5625", most common US grenade fuze (see also 0.75-18 UNS); M201A1 fuze, AN-M8 smoke grenade, M18 smoke grenade, AN-M14 incendiary grenade, M7, M7A1 CN-gas riot grenade, M7A3 CS-gas grenade, M58 CS-gas grenade, M83 practice smoke
 w  9/16-12 LH        M201FB fuze, 10 times higher power than M201, left-thread to avoid accidental use on wrong grenade; used as full charge on eg. training flashbang grenades
 w  0.5625-12 UNC-1A  9/16-12, on US mines/grenades, most common fuze/initiator; eg. M19 nonmetallic antitank mine, often with 0.75-18 or 0.6875-12 as secondary fuze well, or 9/16 f to 11/16 or 1/2 m for booster/activator
W   9/16-5            coach and lag screws (Machinists Handbook 1909)
L   9/16x.083         ballscrew, freewheeling, for leadscrews
*   FG14.3-20         ...see at 9/16-20
@   0.5650-20         STI-1/2-20, 14.4x1.27; screw thread insert thread, ASME B18.29.1
@   M14.5x0.35        DIN 13-2
@   M14.5x0.5         DIN 13-3, DIN 519 (avoid)
 o  M14.5x0.5         some lens mounting rings, for 14mm-dia lens mounts, eg. Thorlabs
@   M14.5x0.75        DIN 13-4
@   M14.5x1           DIN 13-5
 w  M14.5x1 LH        firearm barrel end thread, Heckler-Koch .40
 t  M14.5x1.25        on some adjustable reamers (Beck)
@   M14.5x1.5         DIN 516 (avoid)
H   14.5x2.090        FS -7, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -7, 0.5709-12.2
=====#39 screw        wood/machine screw gage; 0.57108" 14.5054mm (American Screw Co. old standard)
 w  0.575-40          (M14.605x0.635) firearm semiauto pistol recoil compensator thread; most commercial, tapered-sleeve or integral, cone-style comps
H   0.575-12          Whitworth thread proposal, 1857
@   37/64-28
 w  0.578-28          37/64-28, M14.68x0.907; barrel end thread, most common at .45 cal pistols; threaded 1911 (.45)
@   0.578-27          gas (brass pipe) thread, size 9/16", 14.681x0.941; 27-thread series, fine threads for thin-wall tubing
 w  0.581-40          (M14.757x0.635) firearm semiauto pistol recoil compensator thread; used on Wilson, Brown and Storm Lake Machine barrels and bushing style comps
 g  W14.8-18 LH       LPG/propane/butane connection, male on interface; G.21 (according to EN 15202)
=====#40 screw        wood/machine screw gage; 0.58424" 14.8397mm (American Screw Co. old standard)
====.586-32 UNS       ABMA #2 locknut, N-02, M14.88x0.794, 75/128-32
===== 15mm Cu tube    15mm outer-dia tube; ASTM B88M type A/1.2mm, B/1.0mm, C/0.7mm; EN 1057, wall th 0.8,1.0(Y)mm, also soft coil 1.0mm, soft PVC-coated 1mm, 0.7mm chrome-plated; BS 2871, table X (wall th 0.7mm, 5.8 MPa), Y (1mm, 6.7 MPa), Z (0.5mm, 5 MPa); most common copper pipe in Europe (also 22mm)
@   M15x0.35          DIN 13-2
@   M15x0.5           DIN 13-3, DIN 519 (3st)
 o  M15x0.5           lens mount, on some UV objectives, uncommon
 o  M15x0.5           optical filter thread, on some lenses, sensor-side, female on lens; rare, on some piShape laser lenses, some optical sights centering units
    M15x0.5           some Maxon G19 gearbox flanges
    M15x0.5           diesel injector nozzle cap nut - Omap, Bosch, Lucas, Siemens
    M15x0.6           on some bulkhead latch locks, unusual
@o  0.5906-36 NS      15.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
@   M15x0.75          DIN 13-4
 o  M15x0.75          some lens mounting rings
    M15x0.75          diesel injector nozzle cap nut - Omap, KHD
    M15x0.75          attachment thread on Isoma centering microscopes
 w  M15x0.75          firearm barrel end thread, on metric M14 (Norinco M305)
 w  M15x0.75 LH       firearm barrel end thread, on a Saiga-410 shotgun
====M15x1             common; ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), ANSI/ASME B1.13M fine, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M15x1             compression fitting, 10mm tube: metric Norgren/Enots
 %  M15x1             some kitchen faucets; kitchen sink shower heads, common, usually male on hose; also on bathroom showers, shower hoses - uncommon
 %  M15x1             pipe thread on some tea vat tap valves; male on valve
 %  M15x1             faucet aerators, uncommon
    M15x1             circular connectors, MIL-PRF-64266, size 11, backshell/accessory; 0.750-10x2 for coupling
    M15x1             circular connectors, MIL-DTL-38999; size 11 shell/accessory, code B, coupling is 0.750-10x3
    M15x1             bearing retaining locknut, "KM2", ISO 2982 (1971)
    M15x1             on bicycles; crank bolt, Octalink and ISIS Drive
 w  M15x1             firearm barrel end thread, Heckler-Koch 93/33/G-53 (5.56), Heckler-Koch 91/G3 (7.62x39)
 w  M15x1             WW2 German artillery fuze, point detonation, in tip, standard for 2cm/3cm HE/HEI/HC flak and aircraft cannon grenades, external; also M10x1 LH female for booster pellet
====15v1              tire valve, ISO 4570-3, 15.0x1.0 (25.4 tpi)
====M15x1.25          atypical
 g  M15x1.25          some propane torch plumbing
 %  M15x1.25          some valve seats
 %  M15x1.25          fire extinguishers, cartridge threads on cartridge-operated valves, female on valve
 %  M15x1.25          some bathroom water faucets, bottom connections; sleeve nuts over pipe couplings
    M15x1.25          repair thread for M12x1.25 thread inserts for spark plugs; size SW17
    M15x1.25          some wheel bolts, Mercedes Benz GLE (2019-), GLS (2019-), wheel nuts
    M15x1.25          on some motorbikes (Ducati swingarm nut, Husqvarna)
    M15x1.25          some oil drain plugs, uncommon
 p  M15x1.25          on packaging tubes; somewhat uncommon
=== M15x1.5           "3rd choice", ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, DIN, SI M.MB, ISA B (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
    M15x1.5           car oil pan drain plugs, common size
 p  M15x1.5           on packaging tubes; "M15"; common, on larger tubes, primarily in cosmetics and industrial sector; on 30mm, 35mm and 40mm-dia tubes
 p  M15x1.5           common on glue/sealant cartridge dispenser tips, "fine", male on cartridge, industry-standard (also NPT 1/4, M20x1.5)
T   M15x1.5           in common tap-insert sets for vehicle oil plug thread repairs (M13x1.5, M15x1.5, M17x1.5, M20x1.5, M24x1.5)
H   15x1.724          Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   M15x1.75          "ISO-other"
H   15x2.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   15x2              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
@   M15x2             "ISO-other"
H   W15x1/12"         Whitworth Fine Thread DIN 30284, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  15-12             glass bottle thread, British, BS 1918:1953; R-4 finish; round 60°, main dia 14.6mm, depth 0.762mm, bump radius 0.559mm, bump base radius max.0.305mm, bump base width 1.52mm
 p  SP15(-12)         15SP, glass/plastic bottle thread, SP-415,425; 15-415, 15-425; small vials 15/17mm dia, 415 also on dropper bottles; 15-425 for food canning
H   15.0x2.2          Armengaud thread, V-thread, 76° (later 55°), historical
====M15x2.5
 p  M15x2.5           common on glue/sealant cartridge dispenser tips, "coarse", male on cartridge, industry-standard (also NPT 1/4, M20x1.5)
@   DN15(-8)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
=====#41 screw        wood/machine screw gage; 0.59740" 15.1740mm (American Screw Co. old standard)
====Pg-9              15.2-18, 15.2x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG9               cable glands for up to 9mm cable
@%  W0.6-14           gas bottle neck thread, tapered 1:5.625, 
@   0.5999-13         STI-1/2-13, 15.2x1.95; screw thread insert thread, ASME B18.29.1
H   0.600-12          Whitworth thread proposal, 1857
    M15.3x0.5         diesel injector nozzle cap nut - Delphi
    0.605-40 UNS      (M15.37x0.635) diesel injector nozzle cap nut - Stanadyne, Perkin, Lister Petter, Isotta Fraschini, Ambac
 w  SpM15.45-13       grenade fuze, AF-11 (FD-1), AF-12 (FD-1P), AF-13 (FD-2) fuze for offensive/defensive hand grenades, AF-17 for smoke grenades
@   M15.5x0.35        DIN 13-2
@   M15.5x0.5         DIN 13-3
 o  M15.5x0.5         lens mount, sensors 1/6" 1/4" 1/3" 1/2", JIIA image size class II, 2nd choice; in machine vision, 1/2" CCD, 17mm-dia objective tubes (also M10.5x0.5)
 o  M15.5x0.5         some lens mounting rings, for 15mm-dia lens mounts, eg. Thorlabs
    M15.5x0.75        on push-fit tube couplers, R26 cartridge slots for 10mm dia
=====#42 screw        wood/machine screw gage; 0.61056" 15.5082mm (American Screw Co. old standard)
    0.619-20 UNS      thread on some pyrotechnic impulse cartridges
H   15.84x0.8965      Mechaniker thread no.1, 28.1/3 tpi, 75° (size-specific); Siemens-Halske, German, in use until 1925, historical
=====#43 screw        wood/machine screw gage; 0.62372" 15.8425mm (American Screw Co. old standard)
*   5/8" GAS          ...see 0.637-27
*   5/8" copper       ...see 0.764-20, W19.41x1.27
*   5/8" BSP          ...see G5/8, W 7/8-14 W22.23x1.81
*   5/8" BSPP         ...see W22.91-14
*   5/8 JIC           ...see 7/8-14; fittings/tubes, dash size -10, nominal inner dia 5/8"
===== 1/2" Cu pipe    1/2" 12.70mm nominal bore, 5/8" 15.875mm outer diameter pipe; ASTM B88 type K/0.049"/1.24mm, L/0.040"/1.02mm, M/0.028"/0.711mm; plumbing copper pipe in USA/Canada
===== 5/8" Cu tube    DN18, 15.88mm outer-diameter tube; AS 1432 wall thick 1.22mm/18g (A/green, 5.75 MPa), 1.02mm/19g (B/blue, 4.81MPa, also bendable), 0.91mm/20g (C/red, 4.18 MPa, also bendable); AS/NZS 1571, wall thick 0.81mm (3.94 MPa), 0.91mm (4.46 MPa), 1.02mm (5.03 MPa)
@   5/8-64
@   5/8-56
@   5/8-48
@   5/8-40            UNS (H28 1963)
@   5/8-36            UNS (H28 1963)
====5/8-32 UN         32UN, 32-thread, primary size, constant pitch series, UN (H28 1963)
 o  5/8-32 UN         lens mount, US standard series, male on lens, PH3.10
 o  5/8-32 UN         lens mount, 15.875x0.794, "D-mount"; 8mm Cine, for 8mm movie cameras; ANSI/SMPTE 76-1985; backfocus 12.9mm, flange focal dist. 12.294mm; 1/6" 1/4" 1/3" sensors; in machine vision; JIIA image size class II
    5/8-32            panel nut, on some buttons and LED housings; some pneumatic cylinders; common
 w  5/8-32            firearm barrel end thread, male on barrel; on 458 SOCOM, 450 Bushmaster, etc
@   5/8-30
@   5/8-29
====5/8-28 UN         28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
 g  5/8-28 UN         medical gas rail outlets, oxygen
 %  5/8-28 UNS        irrigation sprinklers, in popup spray head bodies, female-threaded; very common; also 5/8-27, various G/NPT
    5/8-28            Maglite flashlights, tailcaps of older AA mini-mags
 w  5/8-28            firearm barrel end thread, male on barrel, rare
*   5/8-27 GAS        ...see 0.637-27
====5/8-27 UNS        NS; 27-thread series, fine threads for thin-wall tubing; "27N", NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  5/8-27            faucet aerators, female on faucet, uncommon
 %  5/8-27            some faucet seats; Kohler
 %  5/8-27 UNS        irrigation sprinklers, in popup spray head bodies, male-threaded stem; also 5/8-28, various G/NPT
!S  5/8-27            US standard microphone holder thread; see also 1/4-20, 3/8-16, 5/8-11, 7/8-27; on goosenecks, poles; uses standard 5/8" tubes
    5/8-27            Maglite flashlight tubes, AA-size, internal (tailcap)
 C  5/8-27 "UNEF"     connectors, eg. circular Mini-Con-X Switchcraft connectors (can be 5/8-28? UNEF does not match pitch)
====16v1              tire valve, ISO 4570-3, 15.8x0.941 (27 tpi)
@   5/8(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   5/8-26 BSC        British Standard Cycle, CEI, bicycles; bolts and nuts
@   5/8-26
    5/8-25            shank on an asshole vendor's CNC lathe tooling (yes, 25 tpi!)
=== 5/8-24 UNEF       M15.88x1.058, primary size, SAE extra fine (1915/1926), UNJEF, ANEF (H28 1944), NEF (H28 1950/1957), UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
 %  5/8-24            tube coupling, 7/16" tube, standard compression fitting with ferrule
 %  5/8-24            JIC tube fittings
 %  5/8-24            faucet aerators, female on faucet, uncommon
 %  5/8-24            some faucet seats; Central Brass
 %  0.625-24 UNEF     conduit-to-panel fittings, MIL-PRF-24758-5, size A
 C  5/8-24 UNEF       N coax connectors, 15.9mm, mating and bulkhead thread
 C  5/8-24 NEF        SO-239 UHF connector
 C  5/8-24            circular connectors, MIL-DTL-5015; size 12S, fitting; size 10SL, coupling (Conxall)
 C  0.625-24 UNEF     circular connectors, MIL-DTL-5015; size 10S and 10SL, coupling (J) and accessory (H)
    0.625-24 UNEF     circular connectors, MIL-DTL-83723; size 10, shell/accessory
    5/8-24 UNEF       connector attachment on top of some M18x1.5 igniters
    5/8-24 NEF        liquid level sensors, electrical feedthroughs
!w  5/8-24            firearm barrel end thread, most common at .30 cal (US, see also M18x1 for Eur), .308/7.62mm and .338LM (Lapua Magnum), many .30; standard AR-10 (.308), M-14 (.308), AR-15 (7.62x39), UZI Carbine/SMG (9mm), Ruger Mini 30 (.30), CMMG chrome-lined 9mm barrels, Nemo Omen (.300 Win Mag), FN SCAR 17 (.308), 300 Blackout (.300)
 w  0.625-24          (M15.875x1.06, 5/8-24) firearm revolver barrel/frame thread; GP-100
 t  5/8-23            on arbor of a CNC lathe tooling from asshole vendor
H   5/8(-20) ADMF     Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 15.875x1.270
H   5/8-20 BSW cyc    British Whitworth cycle
@   5/8-20 WS         Whitworth Special, Whitform
@   5/8-20 BSC        British Standard Cycle, CEI20, bicycles; also as LH; (not in Guide to World Screw Threads); general use
@   BC 5/8-20         BC5/8, 15.88x1.27, bicycle thread, general use, two-wheeled cart shaft; JIS B 0225
====5/8-20 UN         20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
 g  .625-20           gas bottle valve thread, 0.625-20 M15.88x1.27 male, 0.628-20 15.95x1.27 female; valve outlet #200
 %  5/8-20 UN         Swagelok fittings, 3/8" tubes
 %  5/8-20            carburetor inlet fittings, common, less common than 7/8-20
 %  5/8-20            some faucet seats; Union Brass, Briggs, Sayco, Gerber
    0.625-20 UNF      circular connectors, MIL-DTL-83723; size 8, mounting nut
@   0.625-20 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   5/8-20 copper     ...see 0.764-20, W19.41x1.27
*   5/8-18 STI        ...see 0.6972-18, 17.7x1.41 (screw thread insert)
@   ET5/8(-18)        W5/8-18, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°; less common diameter?
=== 5/8(-18) UNF      M15.88x1.411, primary size, screw "Q" (US), ALAM automobile standard (Machinists Handbook 1909), SAE regular, UNJF, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF (B1.1-1935), UNF (H28 1950/1957, H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    AN10              aircraft bolts, 5/8-18 UNF-3A; AN30, clevis bolt; AN80, drilled head; AN180, close tolerance, less common
 g  5/8-18 UNF        gas bottle valve thread, CGA 032 (USA/Canada), female on bottle; inert gases, "B fitting", "size B "inert"" welding hoses (MIG/TIG, standard duty), up to 200 psig
 g  5/8-18 UNF LH     gas bottle valve thread, CGA 033 (USA/Canada), female on bottle; industrial air, water, "B fitting", "size B" welding hoses, up to 200 psig
 g  5/8-18 UNF        gas bottle valve thread, CGA 180 (USA/Canada), female on bottle; small cylinders, all gases
 g  5/8-18 UNF        CO2/N2O cartridges, refillable, larger, male on cartridge; aquarium disposable cylinders, 74g; on paintball/airsoft cylinders, female on bottle
 g  5/8-18 UNF        medical gas rail outlets, vacuum
 g  10/16-18 LH       car air conditioning refrigerant coupling, US EPA standard, R-414B/HCFC Blend Omicron/Hot Shot, high side port
 g  10/16-18          car air conditioning refrigerant coupling, US EPA standard, R-414B/HCFC Blend Omicron/Hot Shot, low side port, 30-lb cylinders
 %  5/8-18            tube coupling, 3/8" tube, standard flare fitting
 %  5/8-18            tube coupling, 3/8 ("-6"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  5/8-18            tube coupling, SAE 45-deg flare (SAE J512)
 %  5/8-18            tube coupling, SAE pilot o-ring seat, male and female swivel
 %  5/8-18            tube coupling, 3/8 ("-6"), male or female pilot, O-ring pilot threads, common in automotive and commercial air conditioning
 %  5/8-18            JIC tube fittings, for 3/8 tube, common
 %  5/8-18 UNF        car engine sensor port, water temperature; British Leyland
 %  5/8-18            on oil filters; lube; common-ish
 %  5/8-18            faucet aerators, female on faucet, uncommon; some kitchen faucet pulldown sprayers
 %  5/8-18            some faucet seats; Union Brass
 t  5/8-18            rotary tool arbors, common for hole saw to shank attachment (also 1/2-20, 1/4-20), male on arbor (cf. 5/8-16 for drill chucks)
    5/8-18            external thread on some industrial sensors (inductance/proximity)
    5/8-18            panel nuts
    5/8-18            car engines, KT Cummins crankshaft
    5/8-18            car wheel nuts; common
    5/8-18            some small vehicle (golf carts) axle nuts, also LH
    5/8-18            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
 w  5/8-18            firearm barrel end thread, male on barrel, rare
 w  5/8-18            breech plug on some rifles
====5/8-16 UN         16UN, 16-thread, primary size, constant pitch series, UN (H28 1963); originally for adjusting collars, retaining nuts
 t  5/8-16            chuck mount thread, bigger drill chucks, less common than 1/2-20 (cf. 5/8-18 on hole saw arbors)
@   0.625-16 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   5/8-14 BSP        ...see G5/8, W 7/8-14 W22.23x1.81
*   5/8-14 BSPP       ...see W22.91-14
@   5/8-14 TWF        Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====5/8(-14) BSF      British Whitworth Fine-pitch; W15.875x1.814; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "Q" (UK)
 %  5/8-14 BSF        pressure test point, manometer attachment diagnostic nipple, "HSP" system
@   5/8-14 UNS        UNS (H28 1963), "14N"
 %  5/8-14            tube coupling, JIS 300, 5/8 ("-10"), tapered, or 30-deg male flare on male
H   0.625-13.09       Holtzapffel & Co. (1856), historical; 15.875x1.94; tap/die "DD", comb-screw tool no.4, mandrel guide no.2
@   5/8-13
    5/8-13            some thumb screws, unusual
@   5/8-12            taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====5/8-12 UN         12UN, 12-thread, primary size, constant pitch series, NS, 12AN, AN (NSTC 1928/1933, H28 1942/1944), "series C" (TM 9-254, 1958), N (B1.1-1935, H28 1957), UN (H28 1963); originally for boiler practice, thin nuts on shafts
    5/8-12            planer head bolts and nuts (Machinists Handbook 1909)
@   0.625-12 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   5/8-11 STI        ...see 0.7431-11, 18.9x2.31 (screw thread insert)
H   0.625-11          Whitworth thread proposal, 1857 (replaces 5/8-11 designation from 1841)
@   5/8-11 TWC        Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====5/8(-11) BSW      British Standard Whitworth; W15.875x2.309; 55°; also "continental Whitworth"; 5/8W11 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 S  5/8 BSW           tripod-mounting of instruments; standard for geodetic instruments (also 5/8-11 UNC); 14-16mm deep; compatible enough with UNC
 S  5/8 BSW           truncated thread form suggested for standardization for geodetic gear in 1945 meeting (vol.73)
    5/8-11 BSW        older British oil switchgear, round copper stud connection to main contacts
H   5/8-11            sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   5/8-11            Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 5/8(-11) UNC      M15.88x2.309, primary size, UNJC, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957/H28 1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
!S  5/8-11 UNC        large geodetic-class tripods, geodetic survey equipment, GPS antennas, rods; drawbolt, male (rarely female) on the tripod; screw often hollow for plumbbob or to see the ground marker; see also 1/4-20, 3/8-16, 5/8-27, 7/8-27, 5/8-11 BSW
 S  5/8-11 UNC        geodetic rods, accessories, spikes/tips; also BSW; smaller accessories in 3/8-16, 1/4-20, M8
 t  5/8-11 UNC        rotary power tools - US standard, see also M14; male on arbor; most common on US angle grinders; wire brushes, rubber sandpaper backing plates/grip plates...; 115,125,178mm discs
 t  5/8-11            collet chuck drawbar end on straight-shank ER32/ER40, Morse-taper MT4 ER40, NST-shank ER40 (also M16x2), on CAT40 tapers, ISO40 holders, BT50
 t  5/8-11            pull stud retention knob for CAT40 tooling head
    5/8-11            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
    5/8-11            car wheel nuts
    5/8-11 NC         electrical feedthrough centerwires
    5/8-11 UNC        common on transformer pins for 1" insulators; bottom pin (female or male) attachment screw (also 3/4-10)
    5/8-11 UNC        on crane hooks; minimum size for #4 hook/crane, workload limit 1.54 tons (Crosby/Bullard)
    5/8-11            thread insert, external thread; keylocking and EZ-Lok steel thinwall, 1/2-20, 1/2-13; keylocking heavy duty and EZ-Lok steel, 7/16-20, 7/16-14; keylocking extra heavy duty, 3/8-24, 3/8-16; EZ-Lok steel extra heavy, 3/8-16
    5/8-11            geodetic tripod/pole pointy tips, female (or male) on tip; geodetic survey pole segments, attachments, female on attachment; also 1/4-20 for smaller
 w  5/8-11            firearm barrel end thread, M11/M12 (.380); common muzzle brake thread
 w  5/8-11            on inert cast-iron practice grenades
 w  5/8-11            ordnance fuze, M204A1, M204A2 fuze, M215 fuze, M26, M26A1, M61, MK2 ("pineapple") grenade
 w  0.625-11 UNC-1A   5/8-11, on US mines/grenades, eg. M605 fuze for M16 mines; eg. M605 fuze for M16 mines
@   5/8-10 NS         said to be common pre-WW1
 h  5/8-10            found on a very old vise, C.Parker vise no.87; on an ancient Greenlee table saw
 C  0.625-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 9, coupling ("business end")
L   5/8-10 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
L   5/8-8 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G; very common
L   5/8-8 square      standard square-thread taps (Machinists Handbook 1909)
@   5/8-7             wooden thread, 60-deg V-thread (US tools - Bealltool, German tools); diameter similar to 16mm
L   5/8-7 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; very uncommon
@   5/8-6             Cordeaux thread, approx. Whitworth, patented in 1877; for connecting porcelain insulators to stalks; BS 16-1937, in Britain/NZ/Australia; also 1/2, 5/8 almost universally for telegraph lines, 3/4 for some bigger insulators
L   5/8-6 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
L   5/8-5             ballscrew, for leadscrews
W   5/8-5             coach and lag screws (Machinists Handbook 1909, modern)
L   5/8x.188          ballscrew, freewheeling, for leadscrews
@g  .628-20           gas bottle valve thread, 0.625-20 M15.88x1.27 male, 0.628-20 15.95x1.27 female; valve outlet #200
===== 16mm Cu tube    16mm outer-dia tube; EN 1057, wall th 1.0mm; unusual
@   M16x0.35          DIN 13-2
 o  M16x0.35          lens mount, for 1" sensors, uncommon
====M16x0.5           ISO extended, DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
 o  M16x0.5           lens mount, "M16", board lens, uncommon
 o  M16x0.5           lens mount, some thermal imaging cameras, uncommon; back flange dist. 12.5mm
 o  M16x0.5           optical filter thread
    M16x0.5           panel nut, fine-threaded, rare
    M16x0.5           electronic cigarette atomizer, rare; Rcomen X Styled RDA Rebuildable Dripping Atomizer, inner chamber
====M16x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M16x0.75          lens mount; common on laser optics, eg. beam expanders; also M22x0.75
 %  M16x0.75          pipe thread on some beer tap valves, tea vat tap valves; male on valve
 C  M16x0.75          connector sleeve nut thread on DIN-style connectors
    M16x0.75          cable clamp nut on RM15 connector, cord clamps sleeve nuts
    M16x0.75          panel nuts, some mechanical screw-in locks
    M16x0.75          diesel injector nozzle cap nut - Bosch, Caterpillar
=== M16x1             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M16x1             lens mount, some lab/industry lenses; alternative to M12x0.5; on some focus modules (M3-FS), rotation stages, mounts/holders; on some medical colorectal cameras
 %  M16x1             faucet aerators, TT, see also M16.5x1; can be male or female on faucet
 %  M16x1             tap head (valve) hot/cold water, top thread T2 (corresponding bottom thread T1 commonly M27x1.5)
 %  M16x1             seen on some heating radiator piping systems, on internal side of valve insert
 %  M16x1             12mm tubing sleeve nut
 %  M16x1             fire extinguishers; dip tube thread
 %  M16x1             base thread for lightbulb sockets, uncommon (also M8x1, M10x1, M13x1); hollow tube for wires
 t  M16x1             chuck mount thread, pull stud tool holders, retention knobs for chucks and arbors
    M16x1             bulkhead switch/button nut thread, spanner 19.0mm  th. 2.5mm
 C  M16x1             common thread on "aviation connectors" with sleeve nuts, eg. GX16, large ones
    M16x1             on some microphones, eg. Razer Seiren Mini; female on mike, male on stand/mount
    M16x1             diesel injector nozzle cap nut - Denso
    M16x1             threaded-body industrial proximity sensors, eg. induction or photoelectric
    M16x1             panel nut, on some switches, LED indicators
    M16x1             common on vehicle spindle/axle stubs, central wheel mount
    M16x1             on some medical oxygen sensors, eg. AO-09
 w  M16x1             firearm barrel end thread, Heckler-Koch Mark 23 (Socom) (.45)
 w  M16x1 LH          firearm barrel end thread, threaded Heckler-Koch .45 barrel; Heckler-Koch USP Tactical (.45), Heckler-Koch Mark 23 (.45); Kriss Vector, "euro stuff"
T   M16x1             present in AUTO-1, AUTO-2, GEKO G38300 thread cutting set
T   M16x1 LH          present in AUTO-1 thread cutting set
====M16x1.25          ISO extended
 %  M16x1.25          some car coolant temperature sensors
 %  M16x1.25          some water hose connection fittings, gastro equipment
 %  M16x1.25          some hydraulic systems fittings
 %  M16x1.25          some banjo bolts
    M16x1.25          some engine oil drain plugs
    M16x1.25          some small engine shaft nuts, rear wheel nuts
    M16x1.25          thread repair inserts for M14x1.25 spark plugs
 t  M16x1.25          on some threaded milling bits
 t  M16x1.25          on some adjustable reamers (Beck)
=== M16x1.5           common; ISO 261 1st, ISO primary fine, ISO screws/bolts/nuts, ISO 262 preferred, electrical conduit EN 60423, BS 3643-1:1981 1st fine, JIS B 0211, MJ, DIN fine, French automobile (Pas Fin), JIS, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M16x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
    M16x1.5           common finer-thread alternative to M16x2
 g  M16x1.5           CO2 canisters, 88g, on eg. paintball guns; CO2 aquarium disposable cylinders, 95g; CO2 12g disposable
 g  M16x1.5           LPG/propane/butane connection, female on bottle; Camping gas VBC02 (G.3) according to EN 15202 and ISO 261, CampinGaz, Gaz
 %  M16x1.5           ISO 6149 hydraulic ports
 %  M16x1.5           metric pipe thread DIN 7631
 %  M16x1.5           "E16", "M16C", electrical conduit
 %  M16x1.5           some tubing systems, e.g. in plastic industry, DN 6 (also M10x1, M14x1.5), DN 9 (also M14x1.5)
 %  M16x1.5           tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M16x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M16x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 10mm tube (light),   8mm tube (heavy)
 %  M16x1.5           tube coupling, Komatsu equipment, 30-deg cone (male cone on male)
 %  M16x1.5           tube coupling, 10mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M16x1.5           tube coupling, French millimetric 24-deg seat, 10mm tube
 %  M16x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 10mm tube; DIN "L", 10mm tube; Russian heavy, 8mm tube; DIN "S", 8mm tube
 %  M16x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 10mm tube; type J (39.2 MPa), 8mm tube
 %  M16x1.5           tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 10mm tube; O-ring face seal (JB1887), 8mm tube
 %  M16x1.5           on flareless tube fittings, for 10 mm tube
 %  M16x1.5           compression fitting, 10mm tube: metric WADE, Ni-plated brass
 %  M16x1.5           fire extinguishers, outlet thread, female on valve, less common than M14x1.5
 %  M16x1.5           fire extinguishers, dip tube, female on valve; most common on 1-12kg sizes
 %  M16x1.5           pressure test point, manometer attachment diagnostic nipple, male on port; common, less common than M16x2; used by eg. Samsung
 %  M16x1.5           hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  M16x1.5           vehicle oil filter thread, oil pan drain
 %  M16x1.5           on oil filters; lube; rare-ish
 %  M16x1.5           grease fitting nipples, "zerk", metric; see also M6x0.5, M6x0.75, M6x1, M8x1, M8x1.25, M10x1, M10x1.5, M12x1, M12x1.5, M14x1.5, M16x1.5
 %  M16x1.5           car engine sensor port, oil temperature; Citroen, Peugeot, Renault
 %  M16x1.5           car engine sensor port, water temperature; Alfa Romeo, Fiat, Honda, Mazda, Subaru, Talbot/Simca ,Toyota
 %  M16x1.5           standard bioreactor lid port; "12mm port" (alternative to PG13.5), female on port
 %  M16x1.5           cable gland, PG9     cable 4..8    19
    M16x1.5           on hot-cartridge pellet stove igniters (M14x1.5, M16x1.5, G1/4, G3/8)
    M16x1.5           on outside of bulkhad push-in tube couplers, 8mm tube
    M16x1.5           compressor oil sight
    M16x1.5           panel nut, on some M12 round connector receptacles
    M16x1.5           pneumatic cylinder, MAL 16mm
    M16x1.5           diesel injector nozzle cap nut - Bosch
    M16x1.5           car wheel nuts
    M16x1.5           common on vehicle spindle/axle stubs, central wheel mount
    M16x1.5           boat propeller nut, typ.25mm-dia shafts; also M16x2
    M16x1.5           wheel axis nut on some small four-wheel ATVs (also M25x1.25, M20x1.5, M18x1.5)
    M16x1.5           in some kitchen/bathroom sinks, clicky drain plug mount
 t  M16x1.5           chuck mount thread, bigger drill chucks, less common
    M16x1.5           semiconductor packaging, stud-mounted diodes/SCRs; typ. DO9, DO-205AB; imperial is 3/4-16 UNF, some also M20x1.5
    M16x1.5           stud bolt size, fine; ISO 898-1
    M16x1.5           thread insert, external thread; keylocking thinwall, M12x1.75; keylocking heavy duty, M10x1.25, M10x1.5
 w  M16x1.5           on some pyrotechnic gas generators (M16x1.5, G1/8, G1/4, G3/8; M11x1; 3/8-24)
T   M16x1.5           present in AUTO-1, GEKO G38300 thread cutting set
====M16x1.6           ISO extended
    M16x1.6           some panel nuts, some piping, very rare
@   M16x1.75
*   M16x2 STI         ...see 18.598x2 (screw thread insert)
H   16x2              Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   Lh16x2            Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   16x2 VDI          VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   16x2              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   16x2              SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   M16x2             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M16(x2)           M16; common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, MJ?, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M16               hex head wrench size: 24 (ANSI/ISO/DIN), 22 (JIS)
 %  M16x2             pressure test point, manometer attachment diagnostic nipple, "Test 20" standard, male on port, common, used worldwide; Press-Check, ISO 15171-2; sampling hose adapters
 t  M16x2             some drill chucks, uncommon
 t  M16x2             draw bars on some collet chucks with BT40/BT50 taper
 t  M16               rotary power tools - metric standard, male on arbor; wire brushes, sanding/polishing backig plates...; less common than M14
    M16               on chainsaw gearwheels, also M10, M14
    M16x2             boat propeller nut, typ.25mm-dia shafts, also M16x1.5
    M16               for heavy pipe holders/clamps
    M16               common on highway guardrails, also M20
    M16               stud bolt size, ISO 898-1, EN 1993-1-8
    M16               hex transmission tower bolts, IFI 541 (M16x2, M20x2.5, M24x3)
    M16x2             high-strength injection structural bolts, DIN 6914
 S  M16               some architectural cable suspension couplers
    M16x2             thread insert, external thread; EZ-Lok steel, 3/8-16, 1/2-13, M10x1.5, M12x1.75
T   M16x2             present in GEKO G38300 thread cutting set
@   S16x2             buttress thread, fine, 33°, DIN 514
L   Tr16x2            trapezoidal fine, 30°, DIN 103; for leadscrews
@   M16x2.5
    M16x2.5           standard reinforced concrete rebar couplers
 p  Rd16x2.5          on caps on small bottles
 p  GL16(x2.5)        on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  KS16(x2.5)        for plastic containers,    buttress thread DIN 6063-1, 40-deg; secondary size
 p  KT16(x2.5)        for plastic containers, trapezoidal thread DIN 6063-2; secondary size
@   E16               Edison thread (E thread DIN 40400), 15.5mm, 10tpi (2.5mm); uncommon
 p  16x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
@   Rd16(-8)          round/knuckle thread, DIN 405
@   S16x4             buttress thread, coarse, 33°, DIN 513
@   Rd16(x4)          round/knuckle thread, DIN 20400
L   M16x4 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; metric
L   Tr16x4            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
s   16x5              M8 threaded insert, DIN 7965; 60°, lesser dia 12.5mm
W   16x6              wood screws, DIN
@   0.6347-18         STI-9/16-18, 16.1x1.41; screw thread insert thread, ASME B18.29.1
@   0.635-40          on bicycle tires, "Slaverand valve"; 16.13x0.635
=====#44 screw        wood/machine screw gage; 0.63688" 16.1768mm (American Screw Co. old standard)
@   0.637-27          gas (brass pipe) thread, size 5/8", 16.18x0.941; 27-thread series, fine threads for thin-wall tubing
@   0.639(-20)        BS copper pipe thread, BScopper, 1/2" inner dia; W16.23x1.27
 t  0.640-26          thread for 3C collets
    41/64-11 UNS      M16.28x2.31; oversized 5/8-11 UNC; on some guywire eye nuts, thimbleyes, twineyes
@   M16.5x0.5         DIN 13-3
 o  M16.5x0.5         some lens mounting rings, for 16mm-dia lens mounts, eg. Thorlabs
@o  0.6496-36 NS      16.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 %  M16.5x1           faucet aerators, TT, "tom thumb"; also M16x1
H   16.5x2.320        FS -8, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -8, 0.6496-10.9
=====#45 screw        wood/machine screw gage; 0.65004" 16.5110mm (American Screw Co. old standard)
@   0.650-19 UNS      safety devices on high pressure gas cylinder valves; H28 1963 (and earlier)
H   0.650-11          Whitworth thread proposal, 1857
@   16.598x2          STI-M14x2, screw thread insert thread, DIN 8140-2
 %  R3/8-24           compression fitting, 3/16" tube: imperial Norgren/Enots
@   3/8-19 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
==  G3/8(-19)         G16.662x1.337, W.6563-19, W 21/32-19, W16.67x1.34, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 g  G3/8 A            gas bottle valve thread, ABNT 166-1 (Brazil), male on bottle, ISO 228-1; oxidizer - N2O
 g  G3/8              gas bottle valve thread, DIN 477 No.11 (Germany, most Europe), male on bottle; oxidizer - N2O over 3 liters
 g  G3/8              gas bottle valve thread, UNI 9097 (Italy), male on bottle; oxidizer - N2O
 g  G3/8              gas bottle valve thread, ITC EP6 TIPO U (Spain), male on bottle; oxidizer - N2O
 g  G3/8              gas bottle valve thread, BS341 No.14 (UK), male on bottle; toxic - HCN, NO
 g  G3/8 LH           gas bottle valve thread, BS341 No.15 (UK), male on bottle; toxic - carbonyl sulfide, H2S
 g  G3/8              gas bottle valve thread, AS 2473.2 Type 44 (Australia/NZ), male on bottle; toxic/nonflammable - calibration gases
 g  G3/8 LH           gas bottle valve thread, AS 2473.2 Type 41 (Australia/NZ), male on bottle; flammable - LPG, propane
!g  G3/8 LH           LPG/propane/butane connection, Camping gas VBC03 (G.33) (according to EN 15202), DIN 477-1 No. 4, SANS 10019 small cylinders; very common in Europe/Czech; female on hose nuts, male on valves/torches
 %  3/8-19 BSPP       on hydraulic pipes with outer dia approx. 11/16"
 %  G3/8              on flareless tube fittings, for 10 mm tube
 %  G3/8              compression fitting, 3/8" tube; imperial WADE
 %  G3/8              hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  G3/8              hydraulic test points, construction vehicles, Caterpillar, Daewoo
 %  G3/8              on shower hoses, uncommon (on boats?); alternative M15x1
 %  G3/8              on coffee machines: steam pipes, water pipes, most common
 %  21/32-18          some faucet seats; Price Pfister
 w  G3/8              on some pyrotechnic gas generators (M16x1.5, G1/8, G1/4, G3/8; M11x1; 3/8-24)
=====#46 screw        wood/machine screw gage; 0.66320" 16.8453mm (American Screw Co. old standard)
====.664-32 UNS       ABMA #3 locknut, N-03, M16.87x0.794, 85/128-32
@   M17x0.35          DIN 13-2
@   M17x0.5           DIN 13-3, DIN 519 (3st), "metric special"
 o  M17x0.5           optical filter thread, rare; some thermal imaging lenses
    M17x0.5           diesel injector nozzle cap nut - Denso, Toyota, Mitsubishi, Nissan, Subaru, Mazda
@   M17x0.75          DIN 13-4
 o  M17x0.75          lens mount, "NF mount", flange focal distance 12mm, up to 1/2" sensors; industrial megapixel machine vision lenses; interface on some cellphone macro lenses; machine vision standard JIIA LE-003 (NF, from Dec 2008) or LE-006 (NF-J, from Jan 2016), JIIA image size class II, 1st choice
 o  M17x0.75          some lens mounting rings, common-ish
    M17x0.75          diesel injector nozzle cap nut - Mercedes common rail, Bosch
    M17x0.75          panel nut on RM15 panel connector
====M17x1             common; ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), ANSI/ASME B1.13M fine, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M17x1             on some gas valves, in gastro equipment
 %  M17x1             on some Bosch fuel injectors; adapters to M20x1.5 available
 %  M17x1             some garden sprayer systems (also M12x1.5)
    M17x1             bearing retaining locknut, "KM3", ISO 2982 (1971)
    M17x1             some panel nuts
    M17x1             circular connectors, MIL-DTL-38999; series III,IV size 9 panel nut
 S  M17x1             stage equipment - Neutrik brand, connector thread to attach microphones - Neutrik's very popular X Series and D Series connectors, both widely recognized as industry standard
 C  M17x1             "M17" circular connectors, signal, common with microphones, Neutrix; M18x0.75 and M20x1.5 as back mounting threads
 w  M17x1             firearm barrel end thread, MAS 1949-56 (.308)
====17v1              tire valve, ISO 4570-3, 17.0x1.0 (25.4 tpi)
@   M17x1.25
    M17x1.25          some car oil pan drain plugs, less common
====M17x1.5           ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, French automobile (Pas Fin), JIS B 0211, SI M.MB, ISA B (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 g  M17x1.5           valve mounts in some diving cylinders
 %  M17x1.5           car radiator thermo switch, some Hyundai
    M17x1.5           some car oil pan drain plugs, sump pump, common size
T   M17x1.5           in common tap-insert sets for vehicle oil plug thread repairs (M13x1.5, M15x1.5, M17x1.5, M20x1.5, M24x1.5)
@   M17x1.75
@   M17x2             "3rd choice", DIN 13-7, DIN 247, "ISO-other"
H   W17x1/12"         Whitworth Fine Thread DIN 30284, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   0.6708-12         STI-9/16-12, 17x2.12; screw thread insert thread, ASME B18.29.1
@   E17(-9)           Edison thread (E thread DIN 40400), 9tpi; lightbulbs, Intermediate (IES), C9; 120 V appliance, Outdoor Christmas; NSTC 1928/1933 (0.645..0.651 base, 0.657..0.664 socket), H28 1942/1944
 w  0.670-36          (M17.02x0.706) firearm revolver barrel/frame thread; N Frame
===== 3/8" pipe       0.675 in, 17.145 mm outer diameter, DN 10, NPS 3/8, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 10mm, ASTM copper tube 12mm; ASTM B42 copper B43 red brass, wall th 0.090"/2.29mm standard, 0.127"/3.23mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
@g  3/8-18 NGT        gas bottle valve thread; valve outlet #240; valve outlet #260 (with 1" nut); H28 1942/1944 (female on valve, anhydrous ammonia)
=== NPT 3/8(-18)      0.6714-18, ~11/16-18, M17.054x1.81; ANPT; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 g  3/8-18 NPT        gas bottle valve thread, CGA 240 (USA/Canada), male on bottle; toxic - ammonia
 g  3/8-18 NGT        gas bottle valve thread, ABNT 172-1 (Brazil), female on bottle; toxic - ammonia
 g  3/8-18 NGT        gas bottle neck thread, female on bottle, taper 1:16; CGA V-1, SI no. 1c; also per IS:12300 for refrigerant valves
 %  3/8-18 NPTF       hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  3/8 NPT           grease fitting nipples, "zerk", US; see also NPT1/8, NPT1/4, NPT3/8, BSPT1/8, BSPT1/4
 %  3/8-18 NPTF       liquid level sensors (also SAE), electrical feedthroughs
 %  NPT3/8(-18)       cable gland, NPT-38  cable 2..6,4..8       spanner 19mm
 %  3/8-18 NPT        faucet aerators, uncommon, male or female on faucet
 S  3/8 IPS           on lamps; commercial ceiling fixtures, floor lamps, heaviest-duty fixture mounts; hollow tube to lead the wires through; derived from gas lamp outlets
 S  3/8 IP            common architectural suspension systems, typ. for 1/16" 1.59mm, 3/32" 2.38mm cable
H   0.675-11          Whitworth thread proposal, 1857
=====#47 screw        wood/machine screw gage; 0.67636" 17.1795mm (American Screw Co. old standard)
 w  0.680-24          (M17.27x1.06)  firearm revolver barrel/frame thread; Ruger Single Action (centerfire)
 w  0.685-40          (M17.399x0.635) firearm semiauto pistol recoil compensator thread; used to fit compensators to threaded Bull and Hybrid barrels
@   11/16-40
@   11/16-36
====11/16-32 UN       32UN, 32-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
    11/16-32          on some 3/4" ball nut assemblies
 w  11/16-32          Remington 1100 11-87 Action spring tube nut, shotgun
@   11/16-30
====11/16-28 UN       28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
    11/16-28          panel nuts
@   11/16-27          27-thread series, fine threads for thin-wall tubing, "27N"
 %  11/16-27          faucet aerators, female on faucet, uncommon
    11/16-27          panel nuts
@   11/16-26 BSC      British Standard Cycle, CEI, bicycles; bolts and nuts, general use
@   11/16(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; secondary size?
 h  0.687-26          antique geodetic/surveying gear, pre-standard, female on tripod; David White; uUsed for farm levels and transit levels
=== 11/16-24          ANEF (H28 1944), UNEF 2nd (H28 1963), aeronautical (H28 1944)
 %  0.688-24 UNEF     conduit fittings, MIL-PRF-24758-2, size B
    11/16-24 NEF      connector attachment on top of M18x1.5 igniter
    11/16-24          panel nuts
 C  0.688-24 UNEF     circular connectors, MIL-DTL-83723; size 10, coupling ("business end")
    0.6875-24 UNEF    circular connectors, MIL-DTL-38999; series I size 9 accessory and panel nut; size 13, shell/accessory, code C, coupling is 0.875-10x3
    11/16-24          common on vehicle spindle/axle stubs, central wheel mount
    11/16-24          sewing machines, Singer tap TW20119, alternative 11/16-24 UNEF
 w  11/16-24          firearm barrel end thread, alternative at .308 cal, alternative at bull barrel, Ruger American .450 Bushmaster mb450
H   11/16-24 CEI      Original Cycle, British bicycles, 60°, historical
@   BC 11/16-24       BC11/16, 17.46x1.058, bicycle thread, general use, hanger (LH), also BC3/4; JIS B 0225
@   11/16-22
 %  11/16-22          some faucet seats
H   11/16(-20) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 17.463x1.270
H   11/16-20 BSW cyc  British Whitworth cycle
@   11/16-20 WS       Whitworth Special, Whitform
 g  W11/16-20         gas bottle valve thread, BS341 No.13 (UK), male on bottle; oxidizer - N2O
@   11/16-20 BSC      British Standard Cycle, CEI20, bicycles; (not in Guide to World Screw Threads)
====11/16-20 UN       20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  11/16-20          tube coupling, 1/2" tube, standard compression fitting with ferrule
 g  11/16-20          tube coupling, brake thread ("-8"), 1/2" tube, sleeve nuts on tubes;, in truck air brakes
 %  11/16-20          some faucet seats
    11/16-20          panel nuts
====11/16-18 UNS
    11/16-18          tube coupling, 7/16 ("-7"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
    11/16-18          in cars, early Ford tie rod ends, LH+RH
====11/16-16 UN       "UNF", M17.46x1.5875, secondary size (nonstandard UNF?), 16UN, ALAM automobile standard (Machinists Handbook 1909), SAE regular, UN 2nd (H28 1963), "series C" (TM 9-254, 1958), Sellers
    AN11              aircraft bolts, 11/16-16 UNF-3A, not in standard size list
 %  11/16-16          tube coupling, 7/16" tube, standard flare fitting
 %  11/16-16 UNF      tube coupling, 3/8 ("-6"), O-ring face seal (ORFS, SAE J1453)
 %  11/16-16 UNF      some hydraulic pressure test point nipples
    11/16-16          TeeJet sprayer nozzles
    11/16-16          car wheel nuts
    11/16-16          Cummins diesel engine head bolts
    11/16-16 UNS      in cars, Land Rover track rod, LH+RH; some old Ford engines
 w  11⁄16-16          (M17.46x1.59)  firearm rifle barrel/receiver thread; fits Remington 700 and XP-100
 w  11/16-16          firearm barrel end thread, MPA .45 cal rifles
i   11/16-16          often listed in tables; still somewhat common?
@   11/16-14 TWF      Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   11/16(-14) BSF    British Whitworth Fine-pitch; W17.463x1.814; 55°; BS 84-1956 (secondary size, avoid if possible); also "continental Whitworth"; in British Standards Interim Report 7270-1919
@   11/16-14          "14N"
@   11/16-13
@   11/16-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====11/16-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1957), UN 2nd (H28 1963); originally for boiler practice, thin nuts on shafts
    11/16-12          planer head bolts and nuts (Machinists Handbook 1909)
 w  0.6875-12 NC      11/16-12, on US mines, common as secondary fuze well (also can be 0.75-18, 0.75-12); eg. on chemical mines, with 2.3125-14
@   11/16-11 TWC      Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   11/16(-11) BSW    British Standard Whitworth; W17.463x2.309; 55°; also "continental Whitworth"; BS 84-1956 (secondary size, avoid if possible)
H   11/16-11          sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
====11/16-11 UNS      USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), "series C" (TM 9-254, 1958), Sellers
    11/16-11          in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    11/16-11          some WW2-era US military aircraft bolts?
i   11/16-11          often listed in tables; still somewhat common?
@   M17.5x0.5         DIN 13-3
 o  M17.5x0.5         some lens mounting rings, for 17mm-dia lens mounts, eg. Thorlabs
====17v2              tire valve, ISO 4570-3, 17.5x1.058 (24 tpi)
 g  17V2              large-bore OTR valves on tires, external thread on stem; for internal thread see 13V1; see also 8V1/5V1, 12V1/9V1, 12V1/8V1
====17v3              tire valve, ISO 4570-3, 17.5x1.588 (16 tpi)
H   17.5x2.4          Armengaud thread, V-thread, 76° (later 55°), historical
=====#48 screw        wood/machine screw gage; 0.68952" 17.5138mm (American Screw Co. old standard)
 h  0.695-24          antique geodetic/surveying gear, pre-standard, male on tripod
 w  0.695-20          M17.65x1.27, firearm, revolver barrel/frame thread; Colt Single Action
@   0.6972-18         STI-5/8-18, 17.7x1.41; screw thread insert thread, ASME B18.29.1
H   0.700-11          Whitworth thread proposal, 1857
=====#49 screw        wood/machine screw gage; 0.70268" 17.8481mm (American Screw Co. old standard)
===== 18mm Cu tube    18mm outer-dia tube; ASTM B88M type A/1.2mm, B/1.0mm, C/0.7mm; EN 1057, wall th 0.8,1.0mm; BS 2871, table X (wall th 0.8mm, 5.6 MPa), Y (1mm, 5.5 MPa), Z (0.6mm, 5 MPa)
@   M18x0.35          DIN 13-2
====M18x0.5           ISO extended, DIN 13-3, DIN 519 (2st), GOST 9150-59 constant, GOST 24705-81
 o  M18x0.5           microscope objective, Schneider D-Claron 4/23mm
 o  M18x0.5           lens mount, Leitz Wetzlar Ludar, Schneider-Kreuznach D-Claron, uncommon; some thermal imaging lenses
 o  M18x0.5           optical filter/lens mount, on some gun sights (Centra?, Gehmann?), alternative M22x0.5
@o  0.7087-36 NS      18.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
====M18x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M18x0.75          microscope objectives, on some microscope turrets
    M18x0.75          panel nuts, panel mount thread on round DIN-style connectors with M16x0.75 cable-sleeve threads, RS19 connectors panel nut, on some "M17" connectors
=== M18x1             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M18x1             faucet aerator, see also M18.5x1, M19x1; male or female on faucet
 C  M18x1             RS19 connectors sleeve nut
    M18x1             circular connectors, MIL-PRF-64266, size 13, backshell/accessory; 0.875-10x2 for coupling
    M18x1             circular connectors, MIL-DTL-38999; size 13 shell/accessory, code C, coupling is 0.875-10x3
    M18x1             panel nut, on some pneumatic/hydraulic panel-mount valves
    M18x1             some car roof antennas (Skoda)
    M18x1             furniture lock; see also M19x1
    M18x1             on push-fit tube couplers, R26 cartridge slots for 12mm dia
    M18x1             threaded-body industrial proximity sensors, eg. induction or photoelectric; also M6x0.5, M12x1
 t  M18x1             on some tooling collets; internal thread in shank of a mini-ER25 collet, ER DIN 6499
 w  M18x1             firearm barrel end thread, most common for .30 cal in Europe (see also 5/8-24 for US); Sako TRG (.308, .338LM), newer CZ EVO Scorpio (9mm)
    M18x1 LH          on bicycles; bottom bracket cones, locknuts
    18-24 LH          on bicycles, bottom bracket; 18x1.06; bottom bracket axle, Thompson
====M18x1.25          ISO extended
 %  M18x1.25          water pipes in some gastro equipment
 %  M18x1.25          steam pipes on some espresso coffee machines
    M18x1.25          some car oil drain plugs
    M18x1.25          shaft nuts on some small motorcycles/mopeds
 t  M18x1.25          on some adjustable reamers (Beck)
=== M18x1.5           common; ISO 261 2nd, ISO secondary fine, ISO screws/bolts/nuts, ISO 262 2nd choice, French automobile (Pas Fin), BS 3643-1:1981 2nd fine, JIS B 0211, MJ, electrical conduit DIN 89280, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, "series F" (TM 9-254, 1958); common finer-thread alternative to M18x2.5, GOST 9150-59 constant, GOST 24705-81
!%  M18x1.5           metric pipe thread DIN 7631
 %  M18x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 g  M18x1.5           valve mounts in some diving cylinders (those too small to take M25x2 or G5/8), argon cylinders for drysuit inflation
 g  M18x1.5-6g        gas bottle neck thread, parallel; EN ISO 15245, EN 144-1, BS 341-1, IS 3224:2014, SI no. 4; see also M25x2, M30x2
 g  M18x1.5           gas bottle neck thread, 30MPa pressurized air paintball tanks
 g  M18x1.5           fire extinguishers, outlet thread, female on valve, on large 25-100 kg ones
 g  M18x1.5           fire extinguishers, dip tube, female on valve; less common than M16x1.5
 g  M18x1.5           pneumatic cylinder
 %  M18x1.5           ISO 6149 hydraulic ports
 %  M18x1.5           tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M18x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M18x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 12mm tube (light),  10mm tube (heavy)
 %  M18x1.5           tube coupling, Komatsu equipment "-6", 30-deg cone (male cone on male)
 %  M18x1.5           tube coupling, 12mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M18x1.5           tube coupling, French millimetric 24-deg seat, 12mm tube
 %  M18x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 12mm tube; DIN "L", 12mm tube; Russian heavy, 10mm tube; DIN "S", 10mm tube
 %  M18x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 12mm tube; type J (39.2 MPa), 10mm tube
 %  M18x1.5           tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 12mm tube; O-ring face seal (JB1887), 10mm tube
 %  M18x1.5           on flareless tube fittings, for 12 mm tube
 %  M18x1.5           compression fitting, 12mm tube: metric Norgren/Enots, Ni-plated brass; 15mm tube: metric WADE
 %  M18x1.5           hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  M18x1.5           on oil filters; lube, some hydraulic; unusual
 %  M18x1.5           car engine sensor port, oil temperature; Daihatsu, Renault, Toyota, Volvo
 %  M18x1.5           car engine sensor port, water temperature; Citroen, Peugeot, Renault, Volvo
 %  M18x1.5           vehicle oil filter thread
 %  M18x1.5           standard bioreactor lid port (alternative system to PG13.5), female on port
    M18x1.5           industrial igniters
    M18x1.5           spark plug thread, "M18", common (other common is M14x1.25); British BS 45:1972; SAE standard
    M18x1.5           in cars, standard for lambda/oxygen sensor
    M18x1.5           compressor oil sight
    M18x1.5           car oil pan drain
    M18x1.5           common on vehicle spindle/axle stubs, central wheel mount
    M18x1.5           wheel axis nut on some small four-wheel ATVs (also M25x1.25, M20x1.5, M16x1.5)
    M18x1.5           cable gland, PG11    cable 5..10   22
    M18x1.5           thread insert, external thread; keylocking heavy duty, M12x1.25, M12x1.75
 w  M18x1.5           firearm barrel end thread, Accuracy International (.308, .338LM)
 p  M18x1.5           on packaging tubes; uncommon
    M18x1.5 LH        on some Zetor trucks
T   M18x1.5           present in AUTO-1, AUTO-2, GEKO G38300 thread cutting set
@   M18x1.75
H   18x2.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   18x2              Bodmer Thread, historical, 50°; for mechanical and optical instruments
=== M18x2             ISO 261 2nd, ISO secondary fine (coarse), ISO 262 2nd choice, BS 3643-1:1981 2nd constant, JIS B 0211, DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 g  M18x2             CO2 "cuvette" for restaurans/pubs, 150-gram pressure bottle, female on bottle, 22-wrench
 t  M18x2             on some chucks (Weldon clamping screw)
    M18x2             stud bolt size, fine; ISO 898-1
@   S18x2             buttress thread, fine, 33°, DIN 514
L   Tr18x2            trapezoidal fine, 30°, DIN 103; for leadscrews
H   W18x1/12"         Whitworth Fine Thread DIN 30284, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   Lh18x2.2          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   18x2.2 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   18x2.5            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   18x2.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   18x2.5            S.F. No.3, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
*   M18x2.5 STI       ...see 21.248x2.5 (screw thread insert)
=== M18(x2.5)         M18, "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, DIN coarse, SI M.MA, ISA A (1940), SI (1971), DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M18x2.5           standard reinforced concrete rebar couplers
    M18x2.5 LH        some tow hooks on cars, thread on bumper
    M18               stud bolt size, ISO 898-1, EN 1993-1-8
    M18               railroads, insert bolt, anchored in concrete sleeper, with nuts/washers for spring blade fastening; NF F50-010
    M18               railroads, fish bolt (on fish plates on rails); cup head oval neck fish bolt, AS 1085.4,6,7
 t  M18x2.5           some woodturning lathe chucks; Elu DB 180
 p  18x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
 p  GL18(x3)          18GL, on glass containers, knuckle thread DIN 168; 60° internal, 30° external; common on lab glassware, tubes 1.6..10mm, aperture 11mm, wrench 22mm; lotion pumps; on 16mm glass tubes
 p  DIN18             on small dropper bottles, caps with droppers; much identical to GL18 (French standard); tamper evident bead mandatory (optional in GL18)
 p  KS18(x3)          for plastic containers,    buttress thread DIN 6063-1, 40-deg
 p  KT18(x3)          for plastic containers, trapezoidal thread DIN 6063-2
 p  Rd18x3            on packaging tubes, small bottles
@   E18               Edison thread (E thread DIN 40400), 18mm, 3mm pitch; uncommon
 p  18-8              glass bottle thread, British, BS 1918:1953; R-4 finish, R-3/2 finish; round 60°, main dia 17.6mm, depth 1.07mm, bump radius 0.787mm, bump base radius max.0.406mm, bump base width 2.13mm
 p  SP18(-8)          18SP, glass/plastic bottle thread, SP-400,410,415,430; 18-400, 18-410, 18-415, 18-430; 400,415 common as small vials, chromatography vials, Yorker caps; 415 also with glass dropper, pump/spray
@   Rd18(-8)          round/knuckle thread, DIN 405
@   S18x4             buttress thread, coarse, 33°, DIN 513
@   Rd18(x4)          round/knuckle thread, DIN 20400
L   Tr18x4            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size?
 p  RD18              on packaging tubes;
@g  W18.16-14         "18T"; gas bottle neck thread, tapered 1:8, on smaller dia; 0.715-14, IS3224 type 4 size 1, SI no. 3a, "0.715-18AU" (AS2473.2), 18T (BS 341-1), "18.16"
=====#50 screw        wood/machine screw gage; 0.71584" 18.1823mm (American Screw Co. old standard); no bigger ones
    R7/16-24          compression fitting, 1/4" tube: imperial Norgren/Enots
    23/32-11          on Aermotor Windmill Company mills
@   M18.5x0.5         DIN 13-3
 %  M18.5x1           faucet aerators, TJ "tiny junior", female on faucet
s   18.5x5            M10 threaded insert, DIN 7965; 60°, lesser dia 15mm
@   18.598x2          STI-M16x2, screw thread insert thread, DIN 8140-2
====Pg-11             18.6-18, 18.6x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG11              some cable glands for up to 11mm cable
s   47/64-13          M18.65x1.95; on self-tapping threaded inserts for 1/2-13 and M12
H   18.7x2.580        FS -9, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -9, 0.7362-9.8
@   0.7431-11         STI-5/8-11, 18.9x2.31; screw thread insert thread, ASME B18.29.1
@g  .745-14 NGO       gas bottle valve thread, 0.745-14 M18.92x1.81 male, 0.750-14 3/4-14 19.05x1.27 female; valve outlet #290
@   M19x0.35          DIN 13-2
@   M19x0.5           DIN 13-3, DIN 519 (3st)
 o  M19x0.5           lens mount, rare; some thermal imaging lenses
 o  M19x0.5           filter thread, rare, machine vision
    M19x0.5           panel nuts for some Fischer Freedom connectors
@   M19x0.75          DIN 13-4
 o  M19x0.75          microscope objective size O1, apparently less common
    M19x0.75          some panel nuts, eg. button switches
    M19x0.75          diesel injector nozzle cap nut - Omap, Lombardini, Stanadyne, Bosch, Iveco, KHD, Lucas, Isuzu
====M19x1             DIN 13-5
 o  M19x1             lens mount, Schneider-Kreuznach D-Claron, uncommon
 %  M19x1             some boiler safety relief valves, Gaggia Milano espresso machine
 %  M19x1             faucet aerators, male on faucet, uncommon
    M19x1             diesel injector nozzle cap nut - Zexel
    M19x1             flywheels on some motorbikes
    M19x1             bulkhead switch/button nut thread, spanner 22.0mm  th. 3.4mm.
    M19x1             bulkhead latch locks, "M19"; furniture lock; see also 3/4-32
 C  M19x1             common thread on "aviation connectors" with sleeve nuts, eg. GX19/GX20, large ones; "M19" connectors
 C  M19x1             RM15 connector, "business end" sleeve nut
 t  M19x1.0           ERM16 mini collet nut
@   M19x1.25
    M19x1.25          Suzuki chain wheel nut
    M19x1.25          glow plugs
    M19x1.25          diesel injector nozzle cap nut - Cav, Iveco, Omap, Fiat, Lucas
====M19x1.5           DIN 13-6, DIN 516
 g  M19x1.5 LH        gas bottle valve thread, ITC EP6 TIPO M (Spain), male on bottle; mixtures - calibration gases
 g  M19x1.5 LH        gas bottle valve thread, DIN 477 No.14 (Germany, most Europe), male on bottle; various - mixtures
 g  M19x1.5 LH        gas bottle valve thread, NEN 3268 LU 0 (Netherlands), male on bottle; flammable mixtures
    M19x1.5           diesel injector nozzle cap nut - Fiat, Bosch, Isuzu
    M19x1.5           some vehicle oil drains
    M19x1.5           common on vehicle spindle/axle stubs, central wheel mount
 h  19x1.5            antique geodetic/surveying gear, pre-standard, male on tripod; Kern and some other European makes.
@   M19x2             DIN 13-7, DIN 247
 t  M19x2             Dremel milling machine collet; adapters to standard 43mm-dia round clamp exist
@   M19x2.5
    M19x2.5           oil drain plugs, some Honda/Kawasaki
*   3/4" NPSH         ...see 1.035-14; hose thread
*   3/4" GAS          ...see 0.77-27
*   3/4" copper       ...see 0.889-20, W22.58x1.27
*   3/4" BSP          ...see G3/4, W 1.1/32-14, W26.19x1.81
*   3/4" NPT          ...see 1.1/16-14, M26.67x1.81
*   3/4" NPSH         ...see 1.035-14, M26.29x1.814
*   3/4" NH           ...see 1.0625-11.5, 1.1/16-11.5, M26.99x2.209
*   3/4" NHR          ...see 1.052-11.5, M26.72x2.209
*   3/4" GHT          ...see 1.1/6-11.5; garden hose thread, USA
*   3/4" UNH          ...see 1.1/6-11.5; garden hose thread, USA
*   3/4 JIC           ...see 1.1/16-12; fittings/tubes, dash size -12, nominal inner dia 3/4"
===== 5/8" Cu pipe    5/8" 15.875mm nominal bore, 3/4" 19.75mm outer diameter pipe; ASTM B88 type K/0.049"/1.24mm, L/0.042"/1.07mm; plumbing copper pipe in USA/Canada
===== 3/4" Cu tube    DN20, 19.05mm outer-diameter tube; AS 1432 wall thick 1.42mm/17g (A/green, 5.56 MPa), 1.02mm/19g (B/blue, 3.97MPa, also bendable), 0.91mm/20g (C/red, 3.45 MPa, also bendable); AS/NZS 1571, wall thick 0.89mm (3.60 MPa), 1.02mm (4.15 MPa), 1.14mm (4.67 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
@   3/4-56
@   3/4-48
@   3/4-40 UNS        UNS (H28 1963)
 o  3/4-40            some lens mounting rings, for 18mm-dia lens mounts, eg. Thorlabs
@   3/4-36            UNS (H28 1963)
 o  3/4-36            lens mount, some microscope objectives
====3/4-32 UN         32UN, 32-thread, primary size, constant pitch series, UN (H28 1963)
 o  3/4-32 UN         lens mount, US standard series, male on lens, PH3.10
    3/4-32            panel nuts, for bigger switches, for US standard 3/4" bulkhead locks; see also M19x1
@   BC 3/4-30         BC3/4, 19.05x0.847, bicycle thread, general use, hanger (also BC11/16); JIS B 0225
@   3/4-30
====3/4-28 UN         28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
    3/4-28            panel nuts, some thermowell-insert thermometers
 w  3/4-28            some firearm barrel threads, male on barrel
*   3/4-27 GAS        ...see 0.77-27
====3/4-27 UNS        NS; 27-thread series, fine threads for thin-wall tubing; "27N", NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  3/4-27            faucet aerators, male on faucet, uncommon
 %  3/4-27            tube coupling, Bugatti Valvofer
    3/4-27            panel nuts (common?)
    3/4-27            in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
@   3/4(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   3/4-26 BSC        British Standard Cycle, CEI, bicycles; bolts and nuts, general use
@   3/4-26
    3/4-25            panel nuts
====3/4-24 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
    3/4-24            panel nuts
 w  3/4-24            firearm barrel end thread, Desert Tactical Arms (.338LM), Barrett MRAD (.338LM), .450 Bushmaster
*   3/4-20 copper     ...see 0.889-20, W22.58x1.27
H   3/4-20 BSW cyc    British Whitworth cycle
@   3/4-20 WS         Whitworth Special, Whitform
@   3/4-20 BSC        British Standard Cycle, CEI20, bicycles; also as LH; (not in Guide to World Screw Threads)
=== 3/4(-20) UNEF     M19.05x1.27, primary size, 20UN, SAE extra fine (1915/1926), UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
c   3/4-20 UN         UNEF standard; 20UN, 20-thread, primary size, constant pitch series
!g  3/4-20 UNEF       on some butane gas torches, MAPP/propylen disposable cylinders; male on bottle, with safety valve; US standard; Benzomatic TS, Express Vulcane; CGA600 bottles
 %  3/4-20 UNEF       Swagelok fittings; series 810, 1/2" tubes; 12mm tubes
 %  3/4-20            JIC tube fittings
 %  3/4-20            on oil filters; lube, transmission; rare
 %  0.750-20 UNEF     conduit-to-panel fittings, MIL-PRF-24758-5, size J
    3/4-20 NEF        igniters, connector attachment on top of some 1/2 NPT flame rods
 C  3/4-20            HN coax connectors, 19.05mm
 C  3/4-20            circular connectors, MIL-DTL-5015; size 14S, fitting; size 12S, coupling (Conxall)
 C  0.750-20 UNEF     circular connectors, MIL-DTL-5015; size 12S and 12SL, coupling (J) and accessory (H)
 C  0.750-20 UNEF     circular connectors, MIL-DTL-83723; size 10, mounting; size 12, shell/accessory
    3/4-20            panel nuts
    3/4-20            common on vehicle spindle/axle stubs, central wheel mount
    3/4-20            vintage Harley Davidson motorcycles; fuel, Linkert bowl lock nut, 1933-64
 w  0.750-20          (M19.05x1.27, 3/4-20) firearm revolver barrel/frame thread; Redhawk (all models)
@   0.75-20 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
====3/4-18 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  3/4-18            tube coupling, 1/2 ("-8"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  3/4-18            tube coupling, 1/2 ("-8"), male pilot, O-ring pilot threads, common in automotive and commercial air conditioning
 %  3/4-18            tube coupling, SAE pilot o-ring seat, male swivel
 %  3/4-18            JIC tube fittings
 %  3/4-18            vintage Harley Davidson motorcycles; fuel, gas tank petcock, 1940-65
 w  0.75-18 UNS       3/4-18, on US mines, common as secondary fuze well (also can be 0.75-12, 0.6875-12); eg. on M19 mine with 0.5625-12
*   3/4-16 STI        ...see 0.8312-16, 21.1x1.59 (screw thread insert)
@   ET3/4(-16)        W3/4-16, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
=== 3/4(-16) UNF      M19.05x1.5875, primary size, screw "S" (US), 16UN, ALAM automobile standard (Machinists Handbook 1909), SAE regular, UNJF, 16AN, ANF (NSTC 1921/1924/1928), ANF/AN (NSTC 1933, H28 1942/1944), UNF/UN (H28 1963), "series B" (TM 9-254, 1958), NF/N (B1.1-1935), UNF (H28 1950/1957), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    AN12              aircraft bolts, 3/4-16 UNF-3A; AN32, clevis bolt; AN182, close tolerance, less common
 %  8AN               3/4-16 fitting thread, usually with 37-deg flare; common on aviation and racing car fuel systems
 g  3/4-16 UNF        CO2/N2O cartridges, refillable, large
 g  3/4-16 UNF        most common for medical gases (oxygen); on valves, bottles; female on bottle, valves output also CGA870; "0.75-16 UNF"; also 9/16-18 UNF
 g  3/4-16 UNF        gas bottle neck thread, parallel, female on bottle; JIS B 8246, IS 3224:2014, SI no. 1
 %  ORB-08            3/4-16 fitting thread, o-ring boss
 %  3/4-16            tube coupling, 1/2" tube, standard flare fitting
 %  3/4-16            tube coupling, 1/2 ("-8"), SAE 45-deg flare (SAE J512), flare male on male
 %  3/4-16 UNF        tube coupling, 1/2 ("-8"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  3/4-16            tube coupling, 1/2 ("-8"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  3/4-16            tube coupling, 1/2 ("-8"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  3/4-16            tube coupling, 1/2 ("-8"), female pilot, O-ring pilot threads, common in automotive and commercial air conditioning
 %  3/4-16            tube coupling, SAE pilot o-ring seat, female swivel
 %  3/4-16            JIC tube fittings, for 1/2 tube
 %  3/4-16 UNF        ports in scientific apparatus vessels; according to: SAEJ1926, SAEJ514; AS5202 (for UNJF)
 %  3/4-16 UNF        hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  3/4-16 UNF        vehicle oil filter thread, popular for improvised silencers; Ford, Dodge, Jeep, non-diesel Toyota/Lancia/Nissan, most Volvo, Suzuki...; sometimes M36x1.5 on other side
 %  3/4-16            on oil filters; lube, hydraulic; very common
 %  3/4-16 UNF        common faucets on water coolers, spigots on jerricans and pails
 %  8AN               carburetor inlet fittings, common, less common than 7/8-20
    3/4-16 UNF        diesel injector nozzle cap nut - Omap, Stanadyne, Ambac, Mac, Perkin, Caterpillar, Deutz Mack, Zexel, Bosch
 t  3/4-16 UNF        woodturning/metal lathe headstock nut/whuck, spanner 1"1/8; Taig Microlathe II
 t  3/4-16            some woodturning lathe collet chucks
 t  3/4-16            chuck mount thread, bigger drill chucks, less common
 t  3/4-16            Dremel tools (eg. Dremel 4000), "throat"/cap plastic mount 
    3/4-16            billiard/pool cue joining pin, less common
    3/4-16            panel nuts
    3/4-16            car wheel nuts
    3/4-16            standard flange frame bolts (3/8 UNC, 3/8 UNF, 1/2 UNC, 1/2 UNF, 5/8 UNC, 5/8 UNF, 3/4 UNF)
    3/4-16            common on vehicle spindle/axle stubs, central wheel mount
    3/4-16            thread insert, external thread; keylocking heavy duty, 1/2-20, 1/2-13, 9/16-12
    3/4-16 UNF-2A     semiconductor packaging, stud-mounted diodes/SCRs; typ. DO9, DO-205AB, metric is M16x1.5, some M20x1.5; typ. TO-118, TO-209AE, metric is M20x1.5, M24x1.5
====19v1              tire valve, ISO 4570-3, 19.0x1.588 (16 tpi)
L   3/4-16 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   0.75-16 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   3/4-14 BSP        ...see G3/4, W 1.1/32-14, W26.19x1.81
*   3/4-14 NPT        ...see 1.1/16-14, M26.67x1.81
*   3/4-14 NPSH       ...see 1.035-14; hose thread
H   3/4(-14) ADMF     Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 19.05x1.814
@   3/4-14 WS         Whitworth Special, Whitform
====3/4-14 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D, "14UN"
 %  3/4-14            tube coupling, JIS 300, 3/4 ("-12"), tapered, or 30-deg male flare on male
@%  .750-14 NGO       gas bottle valve thread, 0.745-14 M18.92x1.81 male, 0.750-14 19.05x1.27 female; valve outlet #290
H   0.75-13.09        Holtzapffel & Co. (1856), historical; 19.05x1.94; tap/die "4-inch center mandrel nose", comb-screw tool no.4, mandrel guide no.2
@   3/4-12 TWF        Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====3/4(-12) BSF      British Whitworth Fine-pitch; W19.05x2.117; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "S" (UK)
@   3/4-12            taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====3/4-12 UN         12UN, 12-thread, primary size, constant pitch series, NS, Sellers, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1957), UN (H28 1963); originally for boiler practice, thin nuts on shafts
    3/4-12            planer head bolts and nuts (Machinists Handbook 1909)
 t  3/4-12            nose thread on many Dremel tools
 w  0.75-12 NS-2A     3/4-12, on US mines, eg. M607 fuze on M21 antitank mine; common as secondary fuze well (also can be 0.75-18, 0.6875-12); eg. on M15 antitank mine with 2.3125-14
@   0.75-12 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   3/4-11.5 NH       ...see 1.0625-11.5, 1.1/16-11.5, M26.99x2.209
*   3/4-11.5 NHR      ...see 1.052-11.5, M26.72x2.209
    3/4-11 Whitworth  older British oil switchgear, round copper stud connection to main contacts
@   3/4-11 UNS
 %  3/4-11            faucet aerators, male on faucet, uncommon
 %  3/4-11            some tubing/fittings, eg. a calibrated flow valvea
*   3/4-10 STI        ...see 0.8799-10, 22.3x2.54 (screw thread insert)
H   0.750-10          Whitworth thread proposal, 1857 (replaces 3/4-10 designation from 1841)
@   3/4-10 TWC        Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====3/4(-10) BSW      British Standard Whitworth; W19.05x2.54; 55°; also "continental Whitworth"; 3/4W10 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 t  3/4-10 BSW        some woodturning lathe chucks; Rockwell Homecraft
H   3/4-10            sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   3/4-10            Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 3/4(-10) UNC      M19.05x2.54, primary size, UNJC, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957/1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
    3/4-10            car wheel nuts
    3/4 UNC           some tunnel concrete connection bolts
    3/4-10 UNC        on crane hooks; minimum size for #5 hook/crane, workload limit 2.09 tons (Crosby/Bullard)
 t  3/4-10            pull stud retention knob for some tooling heads
    3/4-10            on billiard cues
    3/4-10            thread insert, external thread; EZ-Lok steel, 1/2-20, 1/2-13, 9/16-18, 9/16-12, M12x1.75
 w  3/4-10            firearm barrel end thread, M10/M11 (9mm)
 C  0.750-10x2        circular connectors, MIL-PRF-28876, MIL-PRF-64266, size 11, "business end" coupling; 60° stub thread, dual-lead; M15x1 for backshell (MIL-PRF-64266)
 C  0.750-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 11, coupling ("business end")
L   3/4-10 ACME       for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
H   0.75-9.45         Holtzapffel & Co. (1856), historical; 19.05x2.69; tap/die "C", comb-screw tool no.3, mandrel guide no.1
L   3/4-8 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg, less common, NSTC 1933
L   3/4-7 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; very uncommon
@   3/4-6             Cordeaux thread, approx. Whitworth, patented in 1877; for connecting porcelain insulators to stalks; in Britain/NZ/Australia; also 1/2, 5/8 almost universally for telegraph lines, 3/4 for some bigger insulators; nonstandard size? (not in Guide to World Screw Threads, does it exist?)
@   3/4-6             wooden thread, 60-deg V-thread, usual pitch (US tools - Bealltool, German tools) (see also 1/2-8, 1-6); diameter similar to 19mm
L   3/4-6 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
L   3/4-6 square      standard square-thread taps (Machinists Handbook 1909)
L   3/4-5 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg, less common; can be stub-thread
    3/4-5 ACME        broomstick handles, US standard, "3/4 universal", 19.05x5.08; on wood, plastic; incompatile similar variants may exist by vendor (maybe 3/4-6 ACME?); also 1.080-4 ACME
W   3/4-4.5           coach and lag screws (Machinists Handbook 1909, modern)
L   3/4-4             ballscrew, freewheeling, for leadscrews
L   3/4-2             ballscrew, for leadscrews
@   19.10-16          CTC 19-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
*   W19.2-14          ...also see W19.8-14 keg, seems synonymous
@   PZ19.2(-14)       gas bottle neck thread; tapered, Whitworth; PZ39.0, PZ30.3, PZ27.8, PZ19.2; GB 8335:2011 (China), ISO 11363-1:2010
 g  W19.2-14          "17E", "E17 con", on pressure bottles, food gases; ISO, female in cylinder, tapered, less common; possibly synonymous to W19.8-14; see also 17.4-14
 g  PZ19.2-14         fire extinguishers, CO2 bottles, female on bottle, second most common (see also PZ27.8-14, M25x2 for aluminium bottles, 1-11 NPT)
@   0.764(-20)        BS copper pipe thread, BScopper, 5/8" inner dia; W19.41x1.27
    49/64-10 UNS      M19.45x2.54; oversized 3/4-10 UNC; on some guywire eye nuts, thimbleyes, twineyes
@   M19.5x0.5         DIN 13-3
 o  M19.5x0.5         some lens mounting rings, for 18mm-dia lens mounts, eg. Thorlabs
 o  M19.5x0.5         lens mount, rare
    M19.5x0.5         e-cig/vape; on Nemesis mod, FUhattan mod
@o  0.7677-36 NS      19.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
@   0.77-27           gas (brass pipe) thread, size 3/4", 19.558x0.941; 27-thread series, fine threads for thin-wall tubing
H   W0.78-14          microscope objective thread, "Society thread", Royal Microscopical Society 1857, historical; maybe misnomer for W0.80-14?
====W19.8-14 keg      Whitworth gas cylinder thread, W19.8x1.814, tapered 3:25; 17E (EN ISO 11363-1), E17 con (EN 144-1), 19.8mm (DIN 477-1), SI no. 2a
 g  W19.8-14          "17E", "E17 con"; gas bottle neck thread, DIN 477; IS3224 type 2 size 1, SI no. 2a, also CGA V-1; tapered 3:25 (see W19.2-14???); small cylinders; see also W28.8-14
====.781-32 UNS       ABMA #4 locknut, N-04, M19.84x0.794, 25/32-32
    25/32-10          on Aermotor Windmill Company mills
@   M20x0.35          DIN 13-2
 o  M20x0.35          lens mount, for 1" 4k+ sensors, uncommon
====M20x0.5           ISO extended, DIN 13-3, DIN 519 (1st), GOST 9150-59 constant, GOST 24705-81
 o  M20x0.5           lens mount threads, uncommon; some thermal imaging lenses, uncommon
    M20x0.5           e-cig/vape; most common on acrylic and steel tanks; common mod threading: Stingray (not switch), Nemesis (not switch), Origin, 4Nine, etc.
    M20x0.5           some Maxon G22 gearbox flanges
====M20x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M20x0.75          lens mount, Carl-Zeiss Mikrotar, uncommon; some thermal imaging lenses
 o  M20x0.75          some lens mounting rings
    M20x0.75          cable clamp nut on RM21 connector, cord clamps sleeve nuts
=== M20x1             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M20x1             on oil filters; lube; rare
 %  M20x1             faucet aerators, female on faucet, rarely male on faucet, uncommon
    M20x1             e-cig/vape, common mod threading: Caravelsa, EA, Paps, etc
    M20x1             circular connectors, MIL-DTL-38999; series III,IV size 11 panel nut
    M20x1             bearing retaining locknut, "KM4", ISO 2982 (1971)
    M20x1             common on vehicle spindle/axle stubs, central wheel mount
====M20x1.25
 S  M20x1.25          stage equipment, standard for microphone holder rods (and some base plates?)
    M20x1.25          Suzuki chain wheel nut
    M20x1.25          common on vehicle spindle/axle stubs, central wheel mount
    M20x1.25          diesel injector nozzle cap nut, rare
    M20x1.25          some engine oil drain plugs, less common
    M20x1.25          panel nuts, eg. bulkhead locks (less common?)
    M20x1.25          tap head (valve) hot/cold water, bottom thread T1 (corresponding top thread T2 commonly M22x1.25)
=== M20x1.5           common; ISO 261 1st, ISO primary fine, ISO screws/bolts/nuts, electrical conduit EN 60423, French automobile (Pas Fin), BS 3643-1:1981 1st fine, JIS B 0211, MJ, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M20x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M20x1.5           "E20", "M20C"?, electrical conduit, metric; common size, also M25x1.5
 %  M20x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M20x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, (14mm tube (light)), 12mm tube (heavy)
 %  M20x1.5           tube coupling, French GAZ 24-deg seat, 13.25mm tube
 %  M20x1.5           tube coupling, French millimetric 24-deg seat, 14mm tube
 %  M20x1.5           tube coupling, Komatsu equipment, 30-deg cone (male cone on male)
 %  M20x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian heavy, 12mm tube; DIN "S", 12mm tube
 %  M20x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 14mm tube; type J (39.2 MPa), 10mm tube
 %  M20x1.5           hydraulic pressure test point nipples, Press-Check system, ISO 15171-2
 %  M20x1.5           handheld hydraulic test pumps
 %  M20x1.5           ports on Prominent lab pumps
 %  M20x1.5           vehicle oil filter thread; some Ford, Honda, Hyundai, Lada Niva Diesel, Mazda, Mitsubishi, some Peugeot, Subaru, some Volvo...
 %  M20x1.5           on oil filters; lube, hydraulic, transmission; common
 %  M20x1.5           compression fitting, 16mm tube: metric WADE
 %  M20x1.5           on some coffee machines: steam pipes, some Faema machines
 %  M20x1.5           cable gland, PG13.5  cable 6..12   24      // G1/2
 %  M20x1.5           car engine sensor port, oil temperature; Talbot/Simca
 %  M20x1.5           common pressure sensors, up to 60 MPa, eg. XDB305 series; also G1/4, NPT1/8
    M20x1.5           diesel injector nozzle cap nut - VM, Omap, Bosch, Denso
    M20x1.5           car oil pan drain plugs, common size
    M20x1.5           compressor oil sight
    M20x1.5           boat propeller nut, typ.30mm-dia shafts
    M20x1.5           common on vehicle spindle/axle stubs, central wheel mount
    M20x1.5           wheel axis nut on some small four-wheel ATVs (also M25x1.25, M18x1.5, M16x1.5)
    M20x1.5           usual housings for liquid-filled thermometers, https://www.verkon.cz/technicke-sklenene-teplomery/
 t  M20x1.5           some woodturning/metal lathe chucks; Electra Beckum, Multico Sumaro
 p  M20x1.5           on glue/sealant cartridge dispenser tips, larger, male on cartridge, industry-standard (also NPT 1/4, M15x1.5, M15x2.5)
    M20x1.5           some panel nuts, eg. on some "M17" connectors
    M20x1.5           thread insert, external thread; keylocking heavy duty, M14x1.5, M14x2
    M20x1.5           heating radiator valve thread, outside for thermostatic heat attachment; Gampper
    M20x1.5           semiconductor packaging, stud-mounted diodes/SCRs; typ. TO-118, TO-209AE (some also M24x1.5); some DO-205AB; imperial version 3/4-16 UNF
T   M20x1.5           present in AUTO-1, AUTO-2 thread cutting set
T   M20x1.5           in common tap-insert sets for vehicle oil plug thread repairs (M13x1.5, M15x1.5, M17x1.5, M20x1.5, M24x1.5)
@g  W20-14 LH         W20x1.81; gas bottle valve thread, UNI 4405 (Italy), male on bottle; flammable - H2/LPG/propane/butane; Ital. A (EN 16129 G.1); also "M20x14x1 LH"; Italian LPG 11kg bottles, female on hose nut
H   20x2.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
=== M20x2             ISO 261 1st, ISO primary fine (coarse), ISO 262 preferred, BS 3643-1:1981 1st constant, JIS B 0211, DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M20x2             sink faucet thread, coarse
 S  M20x2             on lamps, internal thread on some suspension lampshades (for mounting on hollow tubes)
 %  M20x2             some piping/vacuum systems
 t  M20x2             chuck arbor thread, for large chucks or midsize lathe chucks
 t  M20x2             some woodturning lathe chucks; Tyme Cub
    M20x2             on outside of bulkhad push-in tube couplers, 10mm tube
    M20x2             boat propeller nut, on 30mm-dia shafts
    M20x2             stud bolt size, fine; ISO 898-1
    M20x2.5           high-strength injection structural bolts, DIN 6914
 w  M20x2             AF-14 (FID-1) fuze for smoke, flashbang hand grenades
@   S20x2             buttress thread, fine, 33°, DIN 514
L   Tr20x2            trapezoidal fine, 30°, DIN 103; for leadscrews
H   20x2.4 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh20x2.4          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
*   M20x2.5 STI       ...see 23.248x2.5 (screw thread insert)
H   20x2.5            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   20x2.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   20x2.5            Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   20x2.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   M20x2.5           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M20(x2.5)         M20; common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
 %  M20x2.5           some piping systems and ports, eg. gastronomy (Fagor)
!S  M20x2.5           standard thread for stage equipment stand bases, subwoofer mount poles, tripod stand bases (JBL EON, PRX, STX, VRX and SRX818), more robust alternative to 5/8-27 and M20x1.25
 S  M20               some architectural cable suspension couplers
    M20               stud bolt size, ISO 898-1, EN 1993-1-8
    M20               hex transmission tower bolts, IFI 541 (M16x2, M20x2.5, M24x3)
    M20               common on highway guardrails, also M16
    M20               railroads, fish bolt (on fish plates on rails); cup head oval neck fish bolt, AS 1085.4,6,7
    M20               railroads, fish bolt (on fish plates on rails); German standard track bolt, DIN 5903-1
H   W20x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W20x1/10"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   20.0x2.6          Armengaud thread, V-thread, 76° (later 55°), historical
 p  20x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
 p  GL20(x3)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  KS20(x3)          for plastic containers,    buttress thread DIN 6063-1, 40-deg; secondary size
 p  KT20(x3)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
 p  20-8              glass bottle thread, British, BS 1918:1953; R-4 finish, R-3/2 finish; round 60°, main dia 19.6mm, depth 1.07mm, bump radius 0.787mm, bump base radius max.0.406mm, bump base width 2.13mm
 p  SP20(-8)          20SP, glass/plastic bottle thread, R3/20, SP-400,410,415,430; 20-400, 20-410, 20-415, 20-430; 400 common on small vials, also with glass dropper in lid; 400 common with spray/pump
@   Rd20(-8)          round/knuckle thread, DIN 405
@   S20x4             buttress thread, coarse, 33°, DIN 513
@   Rd20(x4)          round/knuckle thread, DIN 20400
L   M20x4 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; metric
L   Tr20x4            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   DN20(-6)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
    DN20              common on various hoses, couplings exist to G3/4 and G1"; also DN80, DN100
====0.8"-36 AMO       W20.32x0.706; microscope objective standard; 0.800-36 BSMO, 0.800-36 AMO; ISO 8038, BS 3569:1962, ASA B1.11-1958, DIN 58888, BS 7012-4.1; all specifications identical
 o  0.800-36          microscope objective, "RMS thread", "Society thread"; backfocus 150/180mm; microscope objective size O8, older, 20.3mm
H   0.800-10          Whitworth thread proposal, 1857
@g  0.803-14 UNS      gas bottle valve thread, CGA 296 (USA/Canada), female on bottle; oxidizing - oxygen mix above 23%
=== Pg-13.5           20.4-18, 20.4x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG13.5            some cable glands for up to 13.5mm cable
 %  PG13.5            sensors (temperature, pH) on chem/bio reactors and industrial
 %  PG13.5            standard bioreactor lid port; "12mm port", "PG13.5 port" (alternative to M16x1.5, to M18x1.5), female on port
@   M20.5x0.5         DIN 13-3
 o  M20.5x0.5         mounting bores for Thorlabs 20mm-dia optic mounts
 o  M20.5x0.5         some lens mounting rings, for 20mm-dia lens mounts, eg. Thorlabs
 o  M20.5x0.5         optical filters, camera-side filter mounts on some C/CS lenses
@o  0.8071-36 NS      20.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
====20v1              tire valve, ISO 4570-3, 20.5x1.0 (25.4 tpi)
@   .810-20 UNS       M20.57x1.27 (blind holes)
@   13/16-36
====13/16-32 UN       32UN, 32-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   13/16-30
====13/16-28 UN       28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  13/16-28          some cable glands
 C  13/16-28 UN       connectors, eg. waterproof/IP67 RJ45, Firewire, USB (A,B) (outer threads, caps)
    13/16-28          panel nuts
====13/16-27 UNS      27-thread series, fine threads for thin-wall tubing
 %  13/16-27 UNS      on some industrial drum faucets/taps/spouts, female on faucet, for hose extensions; also 1/2-20
 %  13/16-27          faucet aerators, "Delta(R)"
    13/16-27          panel nuts
 C  13/16-27 UNS      connectors, eg. circular Multi-Con-X Switchcraft connectors, bulkhead PS/2 mouse, FINEcables M16 circular
@   13/16(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; secondary size?
@   13/16-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   13/16-26
====13/16-24 UNS      "ANF", NSTC 1928 (spark plug bushing)
 %  13/16-24          faucet aerators, male or female on faucet, uncommon
    13/16-24          industrial igniters
    13/16-24          vintage Harley Davidson motorcycles; chassis, handlebar end screw, 1931-35 "BT", 1931-39 "45"
 h  13/16-24          regular bushing thread for spark plugs, old standard (NSTC 1928)
    13/16-21          car wheel nuts
@   13/16-20 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
=== 13/16-20 UNEF     M20.64x1.27, secondary size, 20UN, UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957, H28 1963 (2nd)), aeronautical (H28 1944)
c   13/16-20 UN       UNEF standard; 20UN, 20-thread, secondary size, constant pitch series
 %  13/16-20 UNEF     ports in scientific apparatus vessels; according to: 6M152, AS1300, AS4201, PS10035
 %  13/16-20 UNEF     some kitchen faucet pulldown sprayers
    13/16-20          car speedometer plug
    13/16-20          panel nuts, eg. some small key switches
    0.8125-20 UNEF    circular connectors, MIL-DTL-38999; series I size 11 accessory and panel nut; size 15, shell/accessory, code D, coupling is 1.000-10x3
 %  0.813-20 UNEF     conduit fittings, MIL-PRF-24758-2, size K
    13/16-20          steering wheel retaining nut, common size; common in many industrial and agricultural applications
    13/16-20          common on vehicle spindle/axle stubs, central wheel mount
 %  13/16-20          faucet aerators,  female on faucet, uncommon
====13/16-18 UNS
 %  13/16-18          tube coupling, 5/8" tube, standard compression fitting with ferrule
 %  13/16-18          tube coupling, brake thread ("-10"), 5/8" tube, sleeve nuts on tubes;, in truck air brakes
 %  13/16-18 UNS      on some diesel truck fuel filters
====13/16-16 UN       "UNF", M20.64x1.5875, secondary size, 16UN, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN 2nd (H28 1957, H28 1963)
    AN13              aircraft bolts, 13/16-16 UNF-3A, not in standard size list
 %  13/16-16 UNF      tube coupling, 1/2 ("-8"), O-ring face seal (ORFS, SAE J1453)
 %  13/16-16 UNF      some hydraulic pressure test point nipples
 %  13/16-16 UNJF     ports in scientific apparatus vessels; according to: AS5202
 %  13/16-16 UNF      vehicle oil filter thread, popular for improvised silencers; Chevy, GM
 %  13/16-16          on oil filters; lube, hydraulic, transmission, turbocharger, power steering; common-ish
H   13/16(-14) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 20.638x1.814
@   13/16-14
 %  13/16-14 UN       some kitchen faucet pulldown sprayers
 %  13/16-14 UNS      on some water valves, cartridges
@   13/16-12 BSF      British Whitworth Fine-pitch; W20.64x2.12; 55°; also "continental Whitworth"; BS 84-1956; secondary size, avoid if possible; in British Standards Interim Report 7270-1919
@   13/16-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====13/16-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1957), UN 2nd (H28 1963); originally for boiler practice, thin nuts on shafts
H   13/16-10          sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   13/16-10 UNS      USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909)
    13/16-10          in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
H   0.8125-9.45       Holtzapffel & Co. (1856), historical; 20.64x2.69; tap/die "5-inch center mandrel nose", comb-screw tool no.3, mandrel guide no.1
 %  R1/2-24           compression fitting, 5/16" tube: imperial Norgren/Enots
H   0.825(-14) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; W20.955x1.81
@   20.955-14         CTG 16-14, thick steel conduit thread, 55°; Japanese, JIS C 8305
@   1/2-14 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G1/2(-14)         G20.955x1.814, W0.8257-14, ~W 13/16-14, W20.955x1.81, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 %  G1/2              common on smaller garden hoses, UK/Europe
 %  G1/2              faucet aerators, uncommon
 g  G1/2              gas bottle valve thread, AS 2473.2 Type 32 (Australia/NZ), male on bottle; toxic - NH3, SO2
 g  G1/2              gas bottle valve thread, BS341 No.10 (UK), male on bottle; toxic - NH3
 g  G1/2              gas bottle valve thread, BS341 No.12 (UK), male on bottle; toxic - SO2
 g  G1/2 LH           gas bottle valve thread, AS 2473.2 Type 42 (Australia/NZ), male on bottle; toxic - methylamine
 g  G1/2              gas bottle neck thread, larger small CO2 tanks, e.g. the 300-gram one, male on bottle; on UK paintball CO2 cylinders, male on cylinder
 %  1/2-14 BSPP       on hydraulic pipes with outer dia approx. 27/32"
 %  G1/2-14           fire extinguishers, outlet thread, female on valve, big 25-100kg ones
 %  G1/2-14           fire extinguishers, dip tube, female on valve; uncommon
 %  G1/2              on flareless tube fittings, for 12 mm tube
 %  G1/2              compression fitting, 1/2" tube: imperial WADE
 %  G1/2              tap head (valve) hot/cold water, bottom thread T1 (corresponding top thread T2 commonly M24x1)
 %  1/2" BSP          vehicle oil filter thread
 %  G1/2              most common on shower hoses in Europe/UK, usually female on hose
    G1/2              backnut for kitchen/bathroom faucets, small
    G1/2              thermowell ports on pipes
====1/2-14NPSH        0.825-14, 1/2NPSH, 0.5-14 NPSH, 20.96x1.814, firehose/hydrant coupling thread; NSTC 1933, ANSI/ASME B1.20.7
 %  1/2-14NPSH        firefighting, booster hose, 1/2" hoses (NFPA)
@g  .825-14 NS        gas bottle valve thread, 0.825-14 20.96x1.81 male, 0.830-14 21.08x1.81 female; valve outlet #300 (for conical nipple); valve outlet #320 (for flat nipple); valve outlet #330 (LH, flat nipple); H28 1944 (acetylene, CO2, N2O, medical O2)
@g  .825-14 NGO       gas bottle valve thread, 0.825-14 M20.96x1.81 male, 0.830-20 21.08x1.27 female; valve outlet #300 (conical nipple), #320 (flat nipple), #330 (LH, flat nipple), #350 (LH, round nipple); H28 1944 (NS) (acetylene, CO2 (Army/Navy), N2O, medical O2)
 g  0.825-14 NGO      gas bottle valve thread, CGA 300 (USA/Canada), male on bottle; refrigerant - ethyl chloride
 g  0.825-14 NGO      gas bottle valve thread, CGA 320 (USA/Canada), male on bottle; nonflammable - CO2
 g  0.825-14 NGO      gas bottle valve thread, CGA 326 (USA/Canada), male on bottle; oxidizer - air
 g  0.825-14 NGO      gas bottle valve thread, CGA 346 (USA/Canada), male on bottle; oxidizer - air
 g  0.825-14 NGO      gas bottle valve thread, AS 2473.2 Type 61 (Australia/NZ), male on bottle; nonflammable over 20 MPa - air
 g  0.825-14 NGO LH   gas bottle valve thread, CGA 330 (USA/Canada), male on bottle; toxic - hydrogen chloride
 g  0.825-14 NGO LH   gas bottle valve thread, CGA 350 (USA/Canada), male on bottle; flammable - hydrogen, methane
 g  0.825-14 NGO LH   gas bottle valve thread, AS 2473.2 Type 43 (Australia/NZ), male on bottle; toxic/corrosive - HCl, H2S
 g  0.825-14 NGO      gas bottle neck thread, airsoft, "ASA thread", "Air Source Adapter", common CO2 bottle thread, CGA 320 (USA/Canada), male on bottle
@   M21x0.35          DIN 13-2
@   M21x0.5           DIN 13-3, DIN 519 (3st)
 o  M21x0.5           lens mount, rare; some thermal imaging lenses
@   M21x0.75          DIN 13-4
 o  M21x0.75          some lens mounting rings
====M21x1             DIN 13-5
 %  M21x1             faucet aerators, female on faucet, uncommon
    M21x1             e-cig/vape, common mod threading: Chi You, King, Astro, Atom, Hammer, Oni, etc
@   M21x1.25
 %  M21x1.25          some faucet valve cartridges, "signorini", rare
====M21x1.5           DIN 13-6, DIN 516
 %  M21x1.5           some tube fittings, nozzles; high-pressure washers, Karcher, WAP
    M21x1.5           on some faucet valves, aesthetic cover attachment
    M21x1.5           some car tie rod ends
@   M21x1.75
@   M21x2             DIN 13-7, DIN 247
@   M21x2.5           "metric special"
    21x4 taper        broomstick handles, standard Italy/southern Europe/Spain/Portugal; tapered 1:11, top dia 19..21mm, bottom dia 17..19mm, pitch 4mm, half-round thread, length about 22mm (varies) (todo: CHECK)
 g  Tr21x4            on SodaStream CO2 tanks, trapezoid
@g  .830-14 NGO       gas bottle valve thread, 0.825-14 M20.96x1.81 male, 0.830-20 M21.08x1.27 female; valve outlet #300 (conical nipple), #320 (flat nipple), #330 (LH, flat nipple), #350 (LH, round nipple); H28 1944 (acetylene, CO2, N2O, medical O2)
@g  .830-14 NS-2 LH   gas bottle valve thread, 0.830-14 M21.08x1.81 male, 0.835-20 M21.21x1.27 female; H28 1942 (LH male on valve, H2, N2, He), H28 1944 (LH male on valve, H2 (Army/Navy), He (Army/Navy))
 g  0.830-14 NGO      gas bottle valve thread, ABNT 209-1 (Brazil), female on bottle; nonflammable - CO2
 g  0.830-14 NGO LH   gas bottle valve thread, ABNT 209-2 (Brazil), female on bottle, round nipple; toxic, flammable - CO, PH3, SiH4
 g  0.830-14 NGO LH   gas bottle valve thread, ABNT 209-4 (Brazil), female on bottle, flat nipple; toxic - HCl, H2S
@   0.8312-16         STI-3/4-16, 21.1x1.59; screw thread insert thread, ASME B18.29.1
@g  W21.2-14          "V1"; gas bottle neck thread, 55°, tapered 3:26, on larger dia; JIS 8246, SI no. 4a
H   21.2x2.870        FS -10, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -10, 0.8346-8.9
@g  .835-14           gas bottle valve thread; H28 1942 (male on valve, acetylene)
@g  .835-14 NS        gas bottle valve thread, 0.830-14 M21.08x1.81 male, 0.835-20 M21.21x1.27 female; valve outlet #300 (conical nipple), #320 (flat nipple), #330 (LH, flat nipple), #350 (LH, round nipple); H28 1942 (LH male on valve, H2, N2, He), H28 1944 (LH male on valve, H2, He)
@   21.248x2.5        STI-M18x2.5, screw thread insert thread, DIN 8140-2
=====1/2" pipe        0.840 in, 21.336 mm outer diameter, DN 15, NPS 1/2, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 15mm, ASTM copper tube 15mm, NFPA 12mm, AWWA 12.7/13mm; ASTM B42 copper B43 red brass, wall th 0.107"/2.72mm standard, 0.149"/3.78mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
@g  NPS 1/2           gas bottle valve thread; H28 1942/1944 (male on valve, ethyl chloride (US Navy))
=== NPT 1/2(-14)      0.8356-14, ~27/32-14, M21.222x1.81; ANPT; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 %  NPT 1/2           residential water connection, US standard
 %  NPT1/2"x14        cable gland, NPT-12  cable 5..9,6..12      24
 %  1/2 NPT           manometers, thermometers; also 1/4 NPT
 %  1/2 IPS           faucet aerator, male on faucet, uncommon
 %  NPT1/2            most common on shower hoses in USA, compatible enough with G1/2
 g  NPT 1/2           LPG/propane/butane connection, SNI 1591:2008a
 g  1/2-14 NGT        gas bottle neck thread, female on bottle, taper 1:16; IS3224 type 1 size 1, SI no. 1d, also CGA V-1; valve outlet #340, #380
 g  1/2-14 NPT        gas bottle neck thread, female on bottle; H28 1944 (N2O, O2 (also 3/4-14 NPT, 1-14 NPT), medical O2; length 3/4")
    1/2-14 NPT        industrial igniters, flame rods, liquid level sensors, electrical feedthroughs, sight glass ports
    1/2 NPT           thermowell ports on pipes, common
 S  1/2-14 NPT        microphone holders and other stage equipment
 S  1/2 IP            architectural suspension systems
    1/2-14 NPT        panel nuts, on eg. some M12 circular connectors
    27/32-20          M21.432x1.27, common on vehicle spindle/axle stubs, central wheel mount
@   M21.5x0.5         DIN 13-3
 g  W21.7-14          gas bottle valve thread, UNI 4406 (Italy), male on bottle; nonflammable/oxidizer - CO2, oxygen
 g  W21.7-14          gas bottle valve thread, UNI 4409 (Italy), male on bottle; inert - N2
 g  W21.7-14          gas bottle valve thread, ITC EP6 TIPO C (Spain), male on bottle; inerts - Ar, He, N2
 g  SI 21.7-14        gas bottle valve thread, AFNOR NF C (France), male on bottle; inert gases - Ar, He, N2
 g  W21.7-14 LH       gas bottle valve thread, ITC EP6 TIPO E (Spain), male on bottle; flammable - H2, methane, propane
 g  SI 21.7-14 LH     gas bottle valve thread, AFNOR NF E (France), male on bottle; flammable - H2, H2 mix over 4%
 g  SI 21.7-14 LH     LPG/propane/butane connection; male on interace; Shell-F (G.2) (according to EN 15202)
@   55/64-27          27-thread series, fine threads for thin-wall tubing
 %  55/64-27          M21.8x0.94, faucet aerators, common US size for male on faucet
====W21.80-14 zyl     W21.8x1.814, Whitworth gas cylinder thread, DIN 477, cylindrical, LH/RH
 g  W21.8-14          gas bottle valve thread, BS341, DIN477, pressure cylinders with O2, Ar, some food-grade CO2 bottles (see also G3/4, converters available)
 g  W21.8-14          gas bottle valve thread, ABNT 218-1 (Brazil), female on bottle; oxidizer - air, oxygen, oxygen mix over 20%
 g  W21.8-14          gas bottle valve thread, DIN 477 No.6 (Germany, most Europe), male on bottle; various - Ar, He, CO2
 g  W21.8-14          gas bottle valve thread, NEN 3268 RU 1 (Netherlands), male on bottle; refrigerants - NH3, CO2
 g  W21.8-14          fire extinguishers, outlet thread, male on valve, standard for CO2
 g  W0.860-14         gas bottle valve thread, AS 2473.2 Type 30 (Australia/NZ), male on bottle; nonflammable/oxidizer - CO2, N2O
 g  W0.860-14         gas bottle valve thread, BS341 No.8 (UK), male on bottle; nonflammable - CO2
 g  W21.8-14 LH       gas bottle valve thread, ABNT 218-2 (Brazil), female on bottle; flammable - hydrogen, methane
 g  W21.8-14 LH       gas bottle valve thread, DIN 477 No.1 (Germany, most Europe), male on bottle; flammable - hydrogen, propane
 g  W21.8-14 LH       gas bottle valve thread, DIN 477 No.2 (Germany, most Europe), male on bottle; flammable - propane
 g  W21.8-14 LH       gas bottle valve thread, NEN 3268 LU 1 (Netherlands), male on bottle; flammable - H2, methane
 g  M21.8-14 LH       LPG/propane/butane connection; male on bottle; GF – Grossflasche (G.04) (according to EN 15202), SI thread (TODO: check if it isn't Whitworth?)
!g  W21.8-14 LH       LPG/propane/butane connection; male on bottle; BSW21.8-14 EU-Shell (G.8) (according to EN 15202), KLF - Kleinflasche (G.12), Shell-F (G.2), G.05, G.19; common Czech
 %  R9/16-24          compression fitting, 3/8" tube: imperial Norgren/Enots
===== 22mm Cu tube    22mm outer-dia tube; ASTM B88M type A/1.6mm, B/1.1mm, C/0.8mm; EN 1057, wall th 0.9(X),1.0,1.1,1.2(Y),1.5mm, also soft coil 1.2mm, soft PVC-coated 1.2mm, 0.9mm chrome-plated; BS 2871, table X (wall th 0.9mm, 5.1 MPa), Y (1.2mm, 5.7 MPa), Z (0.6mm, 4.1 MPa); most common copper pipe in Europe (also 15mm)
@   M22x0.35          DIN 13-2
====M22x0.5           ISO extended, DIN 13-3, DIN 519 (2st), GOST 9150-59 constant, GOST 24705-81
 o  M22x0.5           lens mount, Carl-Zeiss S-Planar, uncommon
 o  M22x0.5           optical filter/lens mount, on some gun sights, alternative M18x0.5
    M22x0.5           e-cig/vape; on Roughneck V2
@o  0.8661-36 NS      M22.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
====M22x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M22x0.75          optical filter thread, Edmund Scietific, 12mm Cx lens
 o  M22x0.75          lens mount; common on laser optics, eg. beam expanders; also M16x0.75
    M22x0.75          panel nut on RM21 panel connector, RS32 connectors panel nut
 w  M22x0.75          firearm barrel end thread, Saiga 12ga shotgun, VEPR 12
*   W22-14            ...see W21.8-14
=== M22x1             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
!%  M22x1             faucet aerators, "junior" (maybe M21.5x1?), euro/german standard, most common, male on faucet; common adapters to G3/8 or to G3/4 (for hoses), M18x1
 %  M22x1             fire extinguishers, dip tube, female on valve; uncommon
 C  M22x1             bulkhead switch/button nut thread, RS32 connectors sleeve nut
    M22x1             common on vehicle spindle/axle stubs, central wheel mount
    M22x1             bearing retaining locknut, "KM44", ISO 2982 (1971)
    M22x1             threaded-body industrial proximity sensors, eg. induction or photoelectric
    M22x1             panel nut, on some pneumatic/hydraulic panel-mount pressure indicators
    M22x1             circular connectors, MIL-PRF-64266, size 15, backshell/accessory; 1.0625-10x2 for coupling
    M22x1             circular connectors, MIL-DTL-38999; size 15 shell/accessory, code D, coupling is 1.000-10x3
    M22x1             on bicycles; crank puller; bottom bracket, crank trigger
@   22-24 BSC LH      on bicycles, bottom bracket; 22x1.06, bottom bracket axle, Fauber
@g  W22-22 LH         LPG/propane/butane connection, W22x1.155 LH (G.06) (according to EN 15202)
====M22x1.25
 %  M22x1.25          piping threads, some safety valves
 t  M22x1.25          some drill chucks, boring heads
    M22x1.25          Dodge Viper hub nuts
    M22x1.25          oil plugs in transmissions, Fiat Lancia,...
    M22x1.25          tap head (valve) hot/cold water, top thread T2 (corresponding bottom thread T1 commonly M20x1.25, M25x1.25)
=== M22x1.5           common; ISO 261 2nd, ISO secondary fine (coarse), ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, JIS B 0211, MJ, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-6, DIN 516; common finer-thread alternative to M22x2.5, GOST 9150-59 constant, GOST 24705-81
 %  M22x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M22x1.5           ISO 6149 hydraulic ports
 %  M22x1.5           metric pipe thread DIN 7631
 %  M22x1.5           tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M22x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M22x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 15mm tube (light),  14mm tube (heavy)
 %  M22x1.5           tube coupling, Komatsu equipment "-8", 30-deg cone (male cone on male)
 %  M22x1.5           tube coupling, French millimetric 24-deg seat, 15mm tube
 %  M22x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 16mm tube; type J (39.2 MPa), 14mm tube
 %  M22x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; DIN "L", 15mm tube; Russian heavy, 14mm tube; DIN "S", 14mm tube
 %  M22x1.5           tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 14mm tube; O-ring face seal (JB1887), 13mm tube
 %  M22x1.5           on flareless tube fittings, for 15 mm tube
 %  M22x1.5           compression fitting, 15mm tube: metric Norgren/Enots, Ni-plated brass
 %  M22x1.5           fire extinguishers; female on bottle
 %  M22x1.5           fire extinguishers, dip tube, female on valve; uncommon
 %  M22x1.5           vehicle oil filter thread
 g  M22x1.5           common on pressurized air brakes on agricultural vehicles, TIR trucks
 %  M22x1.5           car engine sensor port, oil temperature; Alfa Romeo, BMW, Fiat, Lada, Lancia
 %  M22x1.5           on oil filters; lube; common
 %  M22x1.5           seen on some metric heating radiator piping systems
 %  M22x1.5           faucet aerators, "Moen(R)" (maybe M21.5x1.5?)
 %  M22x1.5           cable gland, PG16    cable 10..14  27
    M22x1.5           panel nut, on some pneumatic/hydraulic panel-mount valves
    M22x1.5           pneumatic cylinder, MAL 20,25mm
    M22x1.5           spark plug thread, "M22", uncommon
    M22x1.5           diesel injector nozzle cap nut - Omap, Lombardini, Bosch, Kubota, Toyota, Perkins, Diesel Kiki, Denso
    M22x1.5           car wheel nuts
    M22x1.5           common on vehicle spindle/axle stubs, central wheel mount
    M22x1.5           compressor oil sight
    M22x1.5           bulkhead latch locks "M22"
    M22x1.5           thread insert, external thread; keylocking heavy duty, M16x1.5, M16x2
 t  M22x1.5           ER16 collet nut
 t  M22x1.5           on some tooling collets; internal thread in shank of an ER32 collet, ER DIN 6499
 t  M22x1.5           on some adjustable reamers (Beck)
 w  M22x1.5 LH        WW2 German artillery fuze, Bd.Z.5103*, in grenade base, for armor piercing 3.7cm, 5cm, 7.5cm, 7.62cm
T   M22x1.5           present in AUTO-1 thread cutting set
 p  22x1.66x3         on packaging tubes; 22x5,3-start; "M22"?, 22mm closure, standard; on 50mm tubes
@   M22x1.75
 %  M22x1.75          seen on some hydraulic tubing
    M22x1.75          some vehicle oil drain plugs, rare
=== M22x2             ISO 261 2nd, ISO secondary fine (coarse), ISO 262 2nd choice, BS 3643-1:1981 2nd constant, JIS B 0211, DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 C  M22x2             round connectors, Hirschmann "CA" style
 t  M22x2             on shank shaft arbor adapters for large masonry diamond core bits/hole saws
    M22x2             stud bolt size, fine; ISO 898-1
    M22x2             some truck wheel nuts (Liaz)
H   22x2.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   22x2.5            Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   22x2.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
=== M22(x2.5)         M22, "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse (high strength structural fasteners only), DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
 %  M22x2.5           tubing connections, plastic boom connectors
    M22               stud bolt size, ISO 898-1, EN 1993-1-8
    M22x2.5           high-strength injection structural bolts, DIN 6914
    M22x2.5           standard reinforced concrete rebar couplers
    M22 LH            on some Zetor trucks
    M22               railroads, fish bolt (on fish plates on rails); German standard track bolt, DIN 5903-3 Type C, lengths 110/120mm
    M22               railroads, fish bolt (on fish plates on rails); cup head oval neck fish bolt, AS 1085.4,6,7
    M22               railroads, insert bolt, anchored in concrete sleeper, with nuts/washers for spring blade fastening; NF F50-010
 p  22-10             glass bottle, roll-on finish compatible with Stel capsules, for wine and liquors
H   W22x1/10"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   22x2.8 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh22x2.8          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
====M22x3             ISO extended, "French metric" (Machinists Handbook 1909)
 p  22x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
 p  GL22(x3)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  GL22              on packaging tubes; uncommon; on 50mm-dia tubes
 p  KS22(x3)          for plastic containers,    buttress thread DIN 6063-1, 40-deg
 p  KT22(x3)          for plastic containers, trapezoidal thread DIN 6063-2
@   S22x3             buttress thread, fine, 33°, DIN 514
 p  S22x3             on packaging tubes; sawtooth thread; uncommon
 p  M22x3             on packaging tubes, on 50mm tubes, flip-off caps
L   Tr22x3            trapezoidal fine, 30°, DIN 103; for leadscrews
 p  Tr22x3            on packaging tubes; larger tubes (50mm dia), on cosmetics, standard, very common; on 50mm-dia tubes (isn't it KT22? is it true Tr?)
 %  Tr22x?x4          tube/hose adapters, on pressure washers, Karcher Easy!Lock 22, TR22, KLM (male), KLF (female) (see also M22x1.5)
 p  22-8              glass bottle thread, British, BS 1918:1953; R-4 finish, R-3/2 finish; round 60°, main dia 21.6mm, depth 1.07mm, bump radius 0.787mm, bump base radius max.0.406mm, bump base width 2.13mm
 p  SP22(-8)          22SP, glass/plastic bottle thread, SP-100,400,410,415,430; 22-100, 22-400, 22-410, 22-415, 22-430; 400 common on small vials, scintillation vials 27.5x57mm 20mL, some dropper-in-lid bottles
 p  22-8              glass bottle, roll-on finish; 22-1620
 p  22-8              on packaging tubes, on 50mm tubes/flip-off caps, 1.5 turn of full profile; 22-400
@   Rd22(-8)          round/knuckle thread, DIN 405
@   Rd22(x4)          round/knuckle thread, DIN 20400
@   S22x5             buttress thread, coarse, 33°, DIN 513
L   Tr22x5            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
s   22x5              M12 threaded insert, DIN 7965; 60°, lesser dia 18mm
*   7/8" GAS          ...see 0.885-27
*   7/8" copper       ...see 1.104-20, W28.04x1.27
*   7/8" BSP          ...see G7/8, W28.6x1.814
*   7/8" BSPP         ...see W1.189-14, W30.2x1.824, G7/8
===== 3/4" Cu pipe    3/4" 19.05mm nominal bore, 7/8" 22.225mm outer diameter pipe; ASTM B88 type K/0.065"/1.65mm, L/0.045"/1.14mm, M/0.032"/0.813mm; plumbing copper pipe in USA/Canada
===== 7/8" Cu tube    22.22mm outer-diameter tube; AS/NZS 1571, wall thick 0.91mm (3.14 MPa), 1.22mm (4.26 MPa), 1.40mm (4.93 MPa), 1.63mm (5.79 MPa)
@   7/8-48
@   7/8-40            UNS (H28 1963)
@   7/8-36            UNS (H28 1963)
====7/8-32 UN         32UN, 32-thread, primary size, constant pitch series, UN (H28 1963)
 o  7/8-32 UN         lens mount, US standard series, male on lens, PH3.10
@   7/8-30
====7/8-28 UN         28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
====7/8-27 UNS        NS; 27-thread series, fine threads for thin-wall tubing; NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
!S  7/8-27            M22.23x0.941, on microphone stands, stage stands; also 5/8-27 for microphones; see also 1/4-20, 3/8-16, 5/8-11
*   7/8-27 GAS        ...see 0.885-27
@   7/8(-26) BSB      British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
@   7/8-24 BSC        British Standard Cycle, bicycles, 60°; steering columns of juvenile cycles
====7/8-24 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
    7/8-24            panel nuts
    7/8-24            vintage Harley Davidson motorcycles; chassis, fork stem, 1929-57 "45"; handlebar end screw, 1936-48 "BT", 1940-57 "45"
    7/8-24 LH         bearing nut, on some exercising bikes, Startrac
    7/8-24 LH         on bicycles, bottom bracket; bottom bracket axle, Fauber
 w  7/8-24            firearm barrel end thread, unusual
*   7/8-20 copper     ...see 1.104-20, W28.04x1.27
@   7/8-20 WS         Whitworth Special, Whitform
@   7/8-20 BSC        British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
=== 7/8(-20) UNEF     M22.23x1.27, primary size, 20UN, SAE extra fine (1915/1926), UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
c   7/8-20 UN         UNEF standard; 20UN, 20-thread, primary size, constant pitch series
 %  7/8-20 NF         Swagelok fittings; series 1010, 5/8" tubes; 14mm/15mm/16mm tubes
 %  7/8-20            JIC tube fittings, for 5/8 tube
 %  7/8-20            common carburetor inlet fittings, one of most common
 %  0.875-20 UNEF     conduit-to-panel fittings, MIL-PRF-24758-5, size B
 t  7/8-20            chuck mount thread, even bigger drill chucks, less common
 t  7/8-20            on boring heads/shanks (also 1.1/2-18)
    7/8-20            panel nuts
 C  7/8-20            circular connectors, MIL-DTL-5015; size 16S/size 16, fitting; size 14S, coupling (Conxall)
 C  0.875-20 UNEF     circular connectors, MIL-DTL-5015; size 14 and 14S, coupling (J) and accessory (H)
 C  0.875-20 UNEF     circular connectors, MIL-DTL-83723; size 12, coupling ("business end"); size 14, shell/accessory
    0.875-20 UNEF     circular connectors, MIL-DTL-38999; series II size 9 panel nut
 w  7/8-20            firearm barrel end thread, unusual
====7/8-18 UNS        NS; NSTC 1928 (spark plug shell), UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  7/8-18            tube coupling, 5/8 ("-10"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  7/8-18            tube coupling, 5/8 ("-10"), male pilot, O-ring pilot threads, common in automotive and commercial air conditioning
 %  7/8-18            tube coupling, SAE pilot o-ring seat, male swivel
 %  7/8-18            JIC tube fittings, for 5/8 tube
    7/8-18 NS         in AF Manual 95-3 ("Installation and Maintenance of Aerial Photographic Equipment", 1964, old military hardware)
 h  7/8-18            SAE spark plug thread, old standard (cf. 7/8-14), NSTC 1928 (spark plug shell); A.L.A.M. standard from Oct 1 1908; first adopted by Autocar company
@   7/8-16 WS         Whitworth Special, Whitform
@   ET7/8(-16)        W7/8-16, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°; less common diameter? not standard size?
====7/8-16 UN         16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957, H28 1963); originally for adjusting collars, retaining nuts
 %  7/8-16            on oil filters; lube; rare
 C  7/8-16 UN         "7/8" circular connectors, "Minifast", industrial; mount nuts 1/2-14 NPS, M18x1, M20x1.5
    7/8-16            panel nuts
 t  7/8-16            some woodturning lathe chucks
@   0.875-16 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   7/8-14 STI        ...see 0.9678-14, 24.6x1.81 (screw thread insert)
*   7/8-14 BSP        ...see G7/8, W28.6x1.814
*   7/8-14 BSPP       ...see W1.189-14, W30.2x1.824
H   7/8(-14) ADMF     Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 22.225x1.814
@   7/8-14 WS         Whitworth Special
 w  7/8-14 Whitw(?)   primer threads on old British brass shell cases?
=== 7/8(-14) UNF      M22.23x1.81, primary size, screw "U" (US), ALAM automobile standard (Machinists Handbook 1909), SAE regular, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), NF (B1.1-1935), UNF (H28 1950/1957/1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
    AN14              aircraft bolts, 7/8-14 UNF-3A; AN34, clevis bolt; AN184, close tolerance, less common
 %  10AN              7/8-14 fitting thread, usually with 37-deg flare; common on aviation and racing car fuel systems
 %  10AN              carburetor inlet fittings, uncommon, less common than 7/8-20
 g  7/8-14 UNF        gas bottle valve thread, CGA 024 (USA/Canada), male on bottle; oxygen, "C fitting", "C" nut, "size C" welding hoses (heavy duty), up to 200 psig; H28 1942/1944 ("Class C")
 g  7/8-14 UNF LH     gas bottle valve thread, CGA 025 (USA/Canada), male on bottle; fuel gases, "C fitting", "C" nut, "size C" welding hoses (heavy duty), up to 200 psig; H28 1942/1944 ("Class C")
 g  7/8-14 UNF        gas bottle valve thread, CGA 034 (USA/Canada), female on bottle; inert gases, "C fitting", "size C inert" welding hoses, up to 200 psig
 g  7/8-14 UNF LH     gas bottle valve thread, CGA 035 (USA/Canada), female on bottle; industrial air, water, "C fitting", up to 200 psig
 g  7/8-14 UNF 2A     gas bottle neck thread, valve mounts in 3500psi steel US diving cylinders; ".875-14"
 %  ORB-10            7/8-14 fitting thread, o-ring boss
 %  7/8-14            tube coupling, 5/8" tube, standard flare fitting
 %  7/8-14            tube coupling, 5/8 ("-10"), SAE 45-deg flare (SAE J512), flare male on male
 %  7/8-14 UNF        tube coupling, 5/8 ("-10"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  7/8-14            tube coupling, 5/8 ("-10"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  7/8-14            tube coupling, 5/8 ("-10"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  7/8-14            tube coupling, 5/8 ("-10"), female pilot, O-ring pilot threads, common in automotive and commercial air conditioning
 %  7/8-14            JIC tube fittings, for 5/8 tube
 %  7/8-14            sleeve nuts on 5/8" (outer dia) tubes, flared connections; common on gas stoves/ranges, SAE standard; also 15/16-16
 %  7/8-14 UNF        ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514
 %  7/8-14            on oil filters; lube, hydraulic; rare-ish
 %  7/8-14            on glue/sealant cartridge dispenser tips, "fine", male on cartridge, slightly less common on 1/2" static two-component mixers
    7/8-14            spark plug thread
    7/8-14            car engines, Cat 3508-16 MB, Cat 3400 MB
    7/8-14 UNF        electrical feedthroughs, large electrical feedthrough centerwires
    7/8-14            common on vehicle spindle/axle stubs, central wheel mount
 t  7/8-14            some milling machine arbor nuts
 t  7/8-14 NF         some woodturning lathe chucks
    7/8-14            panel nuts
    7/8-14            thread insert, external thread; keylocking heavy duty, 5/8-18, 5/8-11; extra heavy duty, 1/2-13
 w  7/8-14            bullet reloading press, standard dies (below .50 cal)
 w  7/8-14            firearm barrel end thread, common at .50 BMG; Barrett, EDM
@   7/8-12            taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====7/8-12 UN         12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1957), UN (H28 1963), NS; originally for boiler practice, thin nuts on shafts
 %  0.875-12 UN       shipboard stuffing tube, ASTM F1836, US, size A
 t  7/8-12 LH         some woodturning lathe chucks
@   0.875-12 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   7/8-11 TWF        Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====7/8(-11) BSF      British Whitworth Fine-pitch; W22.225x2.309; 55°; BS 84-1956; in British Standards Interim Report 7270-1919; screw "U" (UK)
    7/8-11 BSF        older British oil switchgear, round copper stud connection to main contacts
    7/8 BSF           railroads, fish bolt (on fish plates on rails); 4.7/8" long, AGICO track bolt, British standard track bolt, BS64
@   7/8-10 UNS        UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  0.875-10x2        circular connectors, MIL-PRF-28876, MIL-PRF-64266, size 13, "business end" coupling; 60° stub thread, dual-lead; M18x1 for backshell (MIL-PRF-64266)
 C  0.875-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 13, coupling ("business end")
@   0.875-10 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   7/8-9 STI         ...see 1.0193-9, 25.9x2.82 (screw thread insert)
H   0.875-9           Whitworth thread proposal, 1857 (replaces 7/8-9 designation from 1841)
@   7/8-9 TWC         Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====7/8(-9) BSW       British Standard Whitworth; W22.225x2.822; 55°; BS 84-1956; also "continental Whitworth"; 7/8W9 (former JIS B 0210); Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
    7/8 BSW           railroads, fish bolt (on fish plates on rails); 4.1/8" long, AGICO track bolt, British standard track bolt, BS64
H   7/8-9             sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   7/8-9             Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 7/8(-9) UNC       M22.23x2.82, primary size, Sellers (1864), USS (Machinists Handbook 1909, V.St'd (Machinists Handbook 1909)), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1957/1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
 %  7/8-9             on glue/sealant cartridge dispenser tips, "coarse", male on cartridge, common on 1/2" static two-component mixers
    7/8-9 UNC         on crane hooks; minimum size for #6 hook/crane, workload limit 3.63 tons (Crosby/Bullard)
    7/8-9             thread insert, external thread; EZ-Lok steel, 5/8-18, 5/8-11, M14x2; EZ-Lok steel extra heavy, 1/2-13
 w  7/8-9             firearm barrel end thread, MPA10 (.45)
L   7/8-8 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg, NSTC 1933
H   0.875-8.25        Holtzapffel & Co. (1856), historical; 22.23x3.08; tap/die "B", comb-screw tool no.2
L   7/8-6 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg, standard size (H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
@   7/8-5.5           wooden thread, 60° V-thread (German cutting tools); diameter similar to 22mm
L   7/8-5 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
L   7/8-4.5 square    standard square-thread taps (Machinists Handbook 1909)
W   7/8-4.5           coach and lag screws (Machinists Handbook 1909)
W   7/8-4             lag screws (modern)
@   0.8799-10         STI-3/4-10, 22.3x2.54; screw thread insert thread, ASME B18.29.1
@g  .880-14 NGO       gas bottle valve thread, 0.880-14 M22.35x1.81 male, 0.885-14 M22.48x1.27 female; valve outlet #510 (LH)
 g  0.880-14 NGO LH   LPG/propane/butane connection, POL US (G.9), POL-WS (G.10), VP01, VP02, VP03(?) (according to EN 15202); female on interface
@   0.885-27          gas (brass pipe) thread, size 7/8", 22.479x0.941; 27-thread series, fine threads for thin-wall tubing
@g  .885-14 NGO       gas bottle valve thread, 0.880-14 M22.35x1.81 male, 0.885-14 M22.48x1.27 female; valve outlet #510 (LH)
 g  0.885-14 NGO LH   gas bottle valve thread, AS 2473.2 Type 21 (Australia/NZ), female on bottle; flammable - LPG, propane; "Type 21", "POL", "POL valve", Prest-O-Lite; on all 4.5kg and 9kg cylinders in Australia, common in USA
 g  0.885-14 NGO LH   gas bottle valve thread, ABNT 225-2 (Brazil), male on bottle; flammable - acetylene, butane
 g  0.885-14 NGO LH   gas bottle valve thread, CGA 510 (USA/Canada), female on bottle; flammable - propane; identical with Australian "Type 21"; Liquid withdrawal VL07
 g  0.885-14 NGO LH   propane/butane/LPG connection, liquid withdrawal, VL07 (according to EN 15202), female on interface
@   M22.5x0.5         DIN 13-3
 o  M22.5x0.5         optical filter, outer dia usual 24     aperture usual 18.5
 o  M22.5x0.5         optical filter; on Lomography Minitar-1 32mm f/2.8 Art lens, Industar-22, Industar-69
 o  M22.5x0.5         common in machine vision
====Pg-16             22.5-18, 22.5x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG16              cable glands for up to 16mm cable
*   W22.5-14          ...see 0.885-14 ???
H   22.5x2.8          Armengaud thread, V-thread, 76° (later 55°), historical
@   0.889(-20)        BS copper pipe thread, BScopper, 3/4" inner dia; W22.58x1.27
@g  .895-14 NGO       gas bottle valve thread, 0.895-14 M22.73x1.81 male, 0.899-14 M22.83x1.81 female; valve outlet #520
@g  .899-14 NGO       gas bottle valve thread, 0.895-14 M22.73x1.81 male, 0.899-14 M22.83x1.81 female; valve outlet #520
H   0.900-9           Whitworth thread proposal, 1857
@   5/8-14 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G5/8(-14)         G22.911x1.814, W0.9022-14, W22.91-14, 5/8 BSPP, BSP pipe thread, "15/16 thread", "5/8 15/16"; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel); Whitworth pipe thread (Machinist Handbook 1909); Original Whitworth Pipe Thread (Guide to World Screw Threads); not used for British Standard Taper Pipe but in BS 2779 (Fastening Threads of BSP sizes)
 %  G5/8              on flareless tube fittings, for 15 mm tube
 g  G5/8              gas bottle valve thread, AS 2473.2 Type 10 (Australia/NZ), female on bottle; nonflammable below 20 MPa - argon, helium, oxygen
 g  G5/8              gas bottle valve thread, AS 2473.2 Type 11 (Australia/NZ), female on bottle, extended nipple; oxidizer 20-25 MPa - oxygen
 g  G5/8              gas bottle valve thread, AS 2473.2 Type 31 (Australia/NZ), male on bottle; chemical gases - SF6, phosgene, methyl bromide
 g  G5/8              gas bottle valve thread, DIN 477 No.7 (Germany, most Europe), male on bottle; toxic - SO2
 g  G5/8              gas bottle valve thread, DIN 477 No.13 (Germany, most Europe), female on bottle; nonflammable - air
 g  G5/8              gas bottle valve thread, ITC EP6 TIPO F (Spain), female on bottle; oxidizer - oxygen
 g  G5/8              gas bottle valve thread, BS341 No.3 (UK), female on bottle; inerts - air, Ar, Ne, N2, helium (balloons, etc.)
 g  G5/8              gas bottle valve thread, BS341 No.3 (UK), female on bottle; oxidizer - oxygen
 g  G5/8              gas bottle valve thread, BS341 No.6 (UK), male on bottle; toxic - Cl2, HCl
 g  G5/8              common outlet on larger helium-balloon filling bottles, female on bottle
!g  G5/8              gas bottle neck thread, "SCUBA DIN", common on diving cylinders, DIN-477 no.13, neck thread, female on cylinder; alternative is M25x2
 g  G5/8 LH           gas bottle valve thread, AS 2473.2 Type 20 (Australia/NZ), female on bottle; flammable - acetylene, hydrogen, ethylene, methane
 g  G5/8 LH           gas bottle valve thread, AS 2473.2 Type 40 (Australia/NZ), male on bottle; toxic - ethylene oxide
 g  G5/8 LH           gas bottle valve thread, ITC EP6 TIPO H (Spain), female on bottle; flammable - acetylene
 g  G5/8 LH           gas bottle thread, BS341 No.2 (UK), male on bottle; flammable - acetylene
 g  G5/8 LH           gas bottle valve valve thread, BS341 No.4 (UK), female on bottle; flammable - acetylene, H2
 g  G5/8 LH           gas bottle valve thread, BS341 No.4 (UK), female on bottle; flammable - CO, methane, natural gas
 g  G5/8 LH           gas bottle valve thread, BS341 No.7 (UK), male on bottle; flammable refrigerants
 g  G5/8 LH           LPG/propane/butane connection, POL 105 (EN 16129 G.7) (according to EN 15202); female on interface
 g  G22.91-14         gas bottle valve thread, NEN 3268 RI 2 (Netherlands), male on bottle; oxidizer - oxygen
 g  W22.9-14          gas bottle valve thread, UNI 4411 (Italy), male on bottle; flammable - acetylene
 g  W22.91-14 LH      gas bottle valve thread, AFNOR NF H (France), female on bottle; flammable - acetylene
@g  .903-14 NGO       gas bottle valve thread, 0.903-14 M22.94x1.81 male, 0.908-14 M23.06x1.27 female; valve outlet #540; H28 1942 (NS) (O2, CO2, air), H28 1944 (NS) (air water pumped, air oil pumped (LH), CO2 (US Navy), N2 water pumped (Army/Navy), N2 oil pumped (Army/Navy) (LH), O2 (Army/Navy))
 g  0.903-14 NGO      gas bottle valve thread, CGA 540 (USA/Canada), male on bottle; oxidizer - oxygen; common in oxygen systems
 g  SI 22.94-14       gas bottle valve thread, AFNOR NF F (France), female on bottle; oxidizer - oxygen
@   M23x0.35          DIN 13-2
@   M23x0.5           DIN 13-3, DIN 519 (3st)
 o  M23x0.5           lens mount, Carl-Zeiss Tessar, uncommon; some thermal imaging lenses, cooled systems, rare
 o  M23x0.5           filter thread, on some sensor-side C-mount lenses, male on lens
@   M23x0.75          DIN 13-4
====M23x1             DIN 13-5
    M23x1             diesel injector nozzle cap nut - Bosch
 C  M23x1             "M23" circular connectors, "Multifast" common with electrical drives and servo-motors in industrial automation applications; M25x1 on some outer shells
@   M23x1.25
====M23x1.5           DIN 13-6, DIN 516
 %  M23x1.5           on oil filters; hydraulic/transmission; rare
 %  M23x1.5           car oil cooler, Citroen; oil filter, Scania, Renault, DAF, KHD
    M23x1.5           car tie rod, Toyota
    M23x1.5           domestic heater radiator valve, Danfoss RA-D
    M23x1.5           kitchen sink mounting thread, on liquid soap dispensers
*   W23-14            ...see W22.9-14
H   W23x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   M23x2             DIN 13-7, DIN 247, "metric special"
H   23x2.5            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
@   M23x2.5           "metric special"
H   W23x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   23x3              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
    29/32-11          M23.02x2.31; on self-tapping threaded inserts for 5/8-11 and M16
@g  .908-14 NGO       gas bottle valve thread, 0.903-14 M22.94x1.81 male, 0.908-14 M23.06x1.27 female; valve outlet #540; H28 1942 (O2, CO2, air), H28 1944 (NS) (air water pumped, air oil pumped (LH), CO2, N2 water pumped, N2 oil pumped (LH), O2)
 o  M23.2x0.75        lens mount, rare
 o  M23.2x0.75        some lens mounting rings
    23.2-32 BSC       on bicycles, bottom bracket; bottom bracket axle, Fauber
@   23.248x2.5        STI-M20x2.5, screw thread insert thread, DIN 8140-2
@   M23.5x0.5         DIN 13-3
 o  M23.5x0.5         optical filter; on Taylor-Hobson Cooke Kinic 25mm f/1.5 lens
@o  0.9252-36 NS      23.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
@o  0.9252-36 NS      23.5x0.706, retaining rings, PH3.17 "IV", Photographic Filter Series, US standard
    23.7x2            broomstick handles, standard France; tapered 1:24, top dia 22.7..23.7mm, bottom dia 21.7..22.7mm, pitch 2mm, V-thread, length about 24mm (varies) (todo: CHECK)
@   15/16-40
@   15/16-36
====15/16-32 UN       32UN, 32-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   15/16-30
====15/16-28 UN       28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   15/16-27          27-thread series, fine threads for thin-wall tubing
 %  15/16-27          faucet aerators, female on faucet, common US size
@   15/16(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; secondary size?
@   15/16-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   15/16-24 UNS
 %  15/16-24          faucet aerators, female on faucet, uncommon
    15/16-24 UNS      bearing nut, on some exercising bikes, Startrac
    15/16-24          on bicycles, bottom bracket; bottom bracket axis, Fauber
=== 15/16-20 UNEF     M23.8125x1.27, secondary size, 20UN, UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957), UNEF/UN 2nd (H28 1963), aeronautical (H28 1944)
c   15/16-20 UN       UNEF standard; 20UN, 20-thread, secondary size, constant pitch series
 %  15/16-20 UN       Swagelok fittings, 5/8" tube
 %  0.938-20 UNEF     conduit fittings, MIL-PRF-24758-2, size C
 C  0.938-20 UNEF     circular connectors, MIL-DTL-83723; size 14, coupling ("business end"); size 12, mounting nut
    0.9375-20 UNEF    circular connectors, MIL-DTL-38999; series I size 13 accessory; size 17 shell/accessory, code E, coupling is 1.1875-10x3
====15/16-18 UNS
    15/16-18          tap head (valve) hot/cold water, bottom thread T1 (corresponding top thread T2 commonly M24x1)
====15/16-16 UN       NS, 16UN, 16-thread, secondary size, constant pitch series, 16AN, N (B1.1-1935, not in 1939 HSTS), AN (H28 1942/1944) N (H28 1957), UN 2nd (H28 1963); originally for adjusting collars, retaining nuts
 %  15/16-16 NS       sleeve nuts on 5/8" (outer dia) tubes, flared connections; common on gas stoves/ranges; also 7/8-14
H   15/16(-14) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 23.813x1.814
@   15/16-14 UNS
@   15/16-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====15/16-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1957), UN 2nd (H28 1963); originally for boiler practice, thin nuts on shafts
    AN15              aircraft bolts, 15/16-12 UNF-3A, not in standard size list; AN185, close tolerance
@   15/16(-11) BSF    British Whitworth Fine-pitch
    15/16 BSF         railroads, fish bolt (on fish plates on rails); 4.7/8" long, AGICO track bolt, British standard track bolt, BS64
H   0.9375-9.45       Holtzapffel & Co. (1856), historical; 23.81x2.69; tap/die "6-inch center mandrel nose", comb-screw tool no.3, mandrel guide no.1
@   15/16(-9) BSW     British Standard Whitworth
    15/16 BSW         railroads, fish bolt (on fish plates on rails); 4.1/8" long, AGICO track bolt, British standard track bolt, BS64
H   15/16-9           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   15/16-9           USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909)
    15/16-9           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
@   M24x0.35          DIN 13-2
====M24x0.5           DIN 13-3, DIN 519 (1st)
 o  M24x0.5           lens mount, optical block of LOMO OKC1-22-1 lens, Schneider-Kreuznach D-Claron, uncommonn
 o  M24x0.5           lens mount; on Bolex 8/19/1.5x attachment, male on atachment
====M24x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M24x0.75          microscope objective, apparently less common
 o  M24x0.75          some thermal camera lenses
    M24x0.75          cable clamp nut on RM24 connector, cord clamps sleeve nuts
=== M24x1             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, DIN 13-5, SI M.MD, ISA D (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
 o  M24x1             lens mount, Narcissus, focal dist. 28.8mm; some thermal imaging lenses (common)
 %  M24x1             faucet aerators, "regular", female on faucet
    M24x1             diesel injector nozzle cap nut - Bosch
    M24x1             tap head (valve) hot/cold water, top thread T2 (corresponding bottom thread T1 commonly G1/2, G3/4, 15/16-18)
 t  M24x1.0           ERM20 mini collet nut
====M24x1.25
 %  M24x1.25          water nozzles/valves for public bathrooms, vandal-proof; flanged soap dispensers
    M24x1.25          some axle nuts
=== M24x1.5           ISO 261 1st, ISO primary fine (coarse), electrical conduit DIN 89280, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M24x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M24x1.5           some tubing systems, e.g. in plastic industry, DN 13
 %  M24x1.5           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M24x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M24x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule,                    16mm tube (heavy)
 %  M24x1.5           tube coupling, French millimetric 24-deg seat, 16mm tube
 %  M24x1.5           tube coupling, French GAZ 24-deg seat, 16.75mm tube
 %  M24x1.5           tube coupling, Komatsu equipment "-10", 30-deg cone (male cone on male)
 %  M24x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 16mm tube; DIN "L", 16mm tube; Russian heavy, 16mm tube; DIN "S", 16mm tube
 %  M24x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 18mm tube; type J (39.2 MPa), 16mm tube
 %  M24x1.5           tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 16mm tube
 %  M24x1.5           compression fitting, 16mm tube: metric Norgren/Enots
 %  M24x1.5           fire extinguishers, water/foam/powder, small, 1-2 kg; female on bottle
 %  M24x1.5           fire extinguishers, dip tube, female on valve; uncommon
 %  M24x1.5           on oil filters; lube, hydraulic, transmission; unusual
 %  M24x1.5           cable gland, PG18    cable 12..16  27
    M24x1.5           on threaded-body industrial sensors (also M12x1, M18x1)
 t  M24x1.5           chuck mount thread, some lathes?
    M24x1.5           car oil pan drain plugs, common size
    M24x1.5           compressor oil sight
    M24x1.5           diesel injector nozzle cap nut - Omap, Deutz
    M24x1.5           common on vehicle spindle/axle stubs, central wheel mount
    M24x1.5           thread insert, external thread; keylocking heavy duty, M18x1.5
    M24x1.5           semiconductor packaging, stud-mounted diodes/SCRs, TO-118, TO-209AE; imperial version is 3/4-16 UNF
 w  M24x1.5           firearm barrel end thread, AK-74 (7.62x39, 7.62x54, 5.45x39, 5.56x45)
T   M24x1.5           present in AUTO-1 thread cutting set
T   M24x1.5           in common tap-insert sets for vehicle oil plug thread repairs (M13x1.5, M15x1.5, M17x1.5, M20x1.5, M24x1.5)
=== M24x2             common; ISO 261 1st, ISO primary fine (coarse), ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, MJ, SI M.MB, ISA B (1940), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (1st); common finer-thread alternative to M24x3, GOST 9150-59 constant, GOST 24705-81
 g  W24x2             gas bottle valve thread, AS 2473.2 Type 50 (Australia/NZ), male on bottle; inert to 20 MPa - nitrogen
 g  M24x2             gas bottle valve thread, on some refillable 200-bar oxygen bottles, male on bottle; see also M10x1, 1-20
 g  M24x2 LH          gas bottle valve thread, DIN 477 No.3.1 (Germany, most Europe), male on bottle; flammable - acetylene
 %  M24x2             on oil filters; lube, hydraulic; rare-ish
    M24x2.0           pneumatic cylinder, MAL 32mm
    M24x2             on outside of bulkhad push-in tube couplers, 12mm tube
    M24x2             stud bolt size, fine; ISO 898-1
    M24x2             truck cab bolt
    M24x2             boat propeller nut, typ.35mm and 40mm-dia shafts
    M24x2             common on vehicle spindle/axle stubs, central wheel mount
====M24x2.5           ISO extended
    M24x2.5           some car tie rods, trailer truck wheel studs
    24x2.5 taper      broomstick handle, German, DIN 68345; 24mm top dia, 20.5mm bottom dia, 2.5mm pitch, 7deg40' taper male, 8deg taper female, 60° V profile 1mm deep, 0.2mm crest radius
H   W24x1/10"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   24x2.78           Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   24x2.8 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh24x2.8          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   24x3              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   24x3              S.F. No.4, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
=== M24(x3)           M24; common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, "series D" (TM 9-254, 1958), GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M24x3             car wheel hubs, Cat 793 wheel hub BH
    M24x3             thread insert, external thread; EZ-Lok steel, M16x2
    M24               some tunnel concrete connection bolts
    M24               hex transmission tower bolts, IFI 541 (M16x2, M20x2.5, M24x3)
    M24x3             high-strength injection structural bolts, DIN 6914
    M24               railroads, fish bolt (on fish plates on rails); German standard track bolt, DIN 5903-3 Type C, lengths 105..200mm
    M24               railroads, fish bolt (on fish plates on rails); cup head oval neck fish bolt, AS 1085.4,6,7
 t  M24x3             some woodturning lathe chucks; B-Line Arundel K600/K450
 t  M24x3             draw bars on some collet chucks with BT60 taper
    M24               stud bolt size, ISO 898-1, EN 1993-1-8
@   S24x3             buttress thread, fine, 33°, DIN 514
 p  KS24(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg; secondary size
 p  KT24(x3)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
L   Tr24x3            trapezoidal fine, 30°, DIN 103; for leadscrews
*   GL24              ...see GL25
 p  24-8              glass bottle thread, British, BS 1918:1953; R-4 finish, R-3/2 finish; round 60°, main dia 23.6mm, depth 1.07mm, bump radius 0.787mm, bump base radius max.0.406mm, bump base width 2.13mm
 p  SP24(-8)          24SP, glass/plastic bottle thread, SP-100,400,410,415,430; 24-100, 24-400, 24-410, 24-415, 24-430; 400,415 common on small vials, scintillation vials, chromatography vials, plastic bottles; 410 pumps/sprays, Yorker dropper tips
!p  SP24(-8)          24SP, glass/plastic bottle thread, SP-414; derived size (uncertain TPI, todo: find); on food bottles; in labs primarily for environmental testing sample vials; 24-410 on smaller spray bottles
@   Rd24(-8)          round/knuckle thread, DIN 405
 p  SP24(-6)          SP? (SPI standard says 8tpi); plastic bottle thread, SP-200,444; 24-200, 24-444
@   S24x5             buttress thread, coarse, 33°, DIN 513
L   Tr24x5            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 w  24x12             railway screw, P49A-type, common for attaching rails to sleepers; 24mm dia, 16mm minor dia, 135mm long (except head), asym.V 20/40°, square head
H   24.11x3.190       FS -11, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -11, 0.9492-8
 w  61/64-12          Japanese WW2 bomb fuzes (Whitworth?); Type 99 Special Bomb Nose Fuze C-2(a), for Type 3 No.6 land, Type 97 No.6 land and Type 98 No.25 land Model 1 bombs
====W24.32-14 zyl     Whitworth gas cylinder thread, W24.32x1.814 DIN 477, cylindrical
 g  W24.32-14         gas bottle valve thread, DIN 477 No.10 (Germany, most Europe), male on bottle; inerts - N2
 g  W24.32-14         gas bottle valve thread, NEN 3268 RU 3 (Netherlands), male on bottle; inerts - Ar, He, N2
@g  0.960-14 NGO      gas bottle valve thread, 0.960-14 M24.38x1.61 male, 0.965-14 M24.51x1.81 female; valve outlet #580, #590 (LH)
 g  0.960-14 NGO      gas bottle valve thread, ABNT 245-1 (Brazil), male on bottle; inerts - Ar, He, N2; inerts - inert gases + oxygen below 20%
 g  0.960-14 NGO LH   gas bottle valve thread, ABNT 245-2 (Brazil), male on bottle; nonflammable - SF6
@   M24.5x0.5         DIN 13-3
 g  W24.5-14          gas bottle valve thread, UNI 4412 (Italy), male on bottle; inerts - Ar, He
@g  0.965-14 NGO      gas bottle valve thread, 0.960-14 M24.38x1.61 male, 0.965-14 M24.51x1.81 female; valve outlet #580, #590 (LH)
 g  0.965-14 NGO      gas bottle valve thread, CGA 580 (USA/Canada), female on bottle; inerts - argon, nitrogen
 g  0.965-14 NGO left gas bottle valve thread, CGA 590 (USA/Canada), female on bottle; oxidizer - air
H   0.9675-30 CEI     Original Cycle, British bicycles, 60°, historical
@   0.9678-14         STI-7/8-14, 24.6x1.81; screw thread insert thread, ASME B18.29.1
 h  0.980-32          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
====.969-32 UNS       ABMA #5 locknut, N-05, M24.61x0.794, 31/32-32
@   31/32-30 BSC      British Standard Cycle, bicycles, 60°; steering columns
@   BC 31/32-30       BC31/32, 24.61x0.847, bicycle thread, general use, front fork shaft (also BC1); JIS B 0225
 %  31/32-20          on oil filters; hydraulic; rare
 %  0.974-20          on oil filters; hydraulic; rare
 w  0.980-12          (M24.89x2.12)  firearm rifle barrel/receiver thread; fits Small Ring Mauser (plug tap cuts full-depth threads on small ring 98s with internal shoulders)
@   M25x0.35          DIN 13-2
@   M25x0.5           DIN 13-3, DIN 519 (3st)
 o  M25x0.5           lens mount, Carl-Zeiss Tessar, Schneider-Kreuznach Repro-Claron, uncommon
 o  M25x0.5           lens mount, on size #00 Schneider-Kreuznach photo enlarger lenses
 o  M25x0.5           lens mount, some thermal imaging cameras, somewhat common; back flange dist. 17.5/18.5mm/19.5mm(most common)
 o  M25x0.5           optical filter, rare
@o  0.9843-36 NS      25.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M25x0.75          DIN 13-4
 o  M25x0.75          lens mount, "M25"; microscope objective size O2, Leica/Nikon Biologicals; higher numerical aperture than W0.8-36; some thermal imaging lenses
    M25x0.75          diesel injector nozzle cap nut - Bosch
====M25x1             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, DIN 13-5, SI M.MD, GOST 9150-59 constant, GOST 24705-81
    M25x1             panel nuts, bulkhead switch/button nut thread, spanner 30, tt 33, on metal parts (M25x1.25 on plastic)
    M25x1             circular connectors, MIL-DTL-38999; series III,IV size 13 panel nut; size 17 shell/accessory, code E, coupling is 1.1875-10x3
    M25x1             internal on throat of some E14 lightbulb holders, with M28x2 external thread
    M25x1             outer shells on some "M23" circular connectors
    M25x1             on bicycles, steerer tube headset, France (also FG25.4)
 t  M25x1             chuck mount thread, eg. some Chinese woodturning lathes (80mm) (see M14x1, M25x1, M44x1, M67x1)
@   M25x1.25
 C  M25x1.25          common thread on "aviation connectors" with sleeve nuts, eg. GX25, large ones
    M25x1.25          panel nut, on some pushbuttons and lights, on plastic parts (M25x1 on metal)
    M25x1.25          tap head (valve) hot/cold water, bottom thread T1 (corresponding top thread T2 commonly M22x1.25)
    M25x1.25          wheel axis nut on some small four-wheel ATVs (also M20x1.5, M18x1.5, M16x1.5), motorbike wheel nuts (eg. Ducati)
=== M25x1.5           common; ISO 261 3rd, ISO tertiary fine (coarse), electrical conduit EN 60423, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M25x1.5           "E25", "M25C", electrical conduit, common size, also M20x1.5
 %  M25x1.5           cable gland, PG19    cable 12..15
 %  M25x1.5           fire extinguishers, water/foam/powder, small, 1-3 kg; female on bottle; less common than M24x1.5, much less than M30x1.5
    M25x1.5           bearing retaining locknut, "KM5", ISO 2982 (1971)
    M25x1.5           common on vehicle spindle/axle stubs, central wheel mount
    M25x1.5           some hydraulic shock absorbers
 t  M25x1.5           ER20 collet nut
 t  M25x1.5           on some adjustable reamers (Beck)
 w  M25x1.5           WW2 German artillery fuze, 3,7cm Bd.Z.P34(t), base fuze, for AP 3,7cm Pzgr.34 (t)
====M25x2             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MB, ISA B (1940), SI fine (1971), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
 g  M25x2-6g          gas bottle neck thread, parallel; ISO 15245, EN 144-1, BS 341-1, IS 3224:2014, SI no. 5; see also M18x1.5, M30x2
 g  M25x2             gas bottle neck thread, common on diving cylinders, neck thread, female on cylinder; "DIN", alternative is G5/8
 g  M25x2             gas bottle neck thread, valve mounts in most European pressurized air diving cylinders, "DIN", deceptively similar to 3/4-14 NPSM; see M26x2 for nitrox
 g  M25x2             gas bottle neck thread, fire extinguishers, CO2, 2-9kg, 10-50kg, aluminium bottles; female on bottle
 C  M25x2             RM21 connector, "business end" sleeve nut
 t  M25x2             some woodturning lathe chucks; Tyme Avon (’83 on) and Classic Tanner SD165, Selbix Springwood, Sorby, Cotech
H   25.0x3.0          Armengaud thread, V-thread, 76° (later 55°), historical
H   25x3.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   25x3              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   M25x3             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; ISO tertiary and fine-only there
@   M25x3             "3rd choice"
    M25x3             standard reinforced concrete rebar couplers
 p  25x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
 p  GL25(x3)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external; common on lab glassware, glass media bottles; tubes 2..14mm, aperture 15mm, wrench 27mm; on 22mm glass tubes
 p  KS25(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg
 p  KT25(x3)          for plastic containers, trapezoidal thread DIN 6063-2
 p  25-8              glass bottle, roll-on finish compatible with Stel capsules, for wine and liquors
 p  25ROPP(-8)        also PP25, ROPP25 (Roll-On Pilfer Proof); single-thread 720-deg; slightly different thread form to GPI SP4xx ones; pharmaceutical bottles
 p  GL25(x3.5)        on glass containers, knuckle thread DIN 168; 60° internal, 30° external; common in labs, on 10..25mL Duran bottles; on 22mm glass tubes
@   Rd25(x4)          round/knuckle thread, DIN 20400
@   DN25(-6)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
s   25x5              M16 threaded insert, DIN 7965; 60°, lesser dia 20.5mm
@   25.248x2.5        STI-M22x2.5, screw thread insert thread, DIN 8140-2
*   1" GAS            ...see 1.006-27
*   1" copper         ...see 1.155-20, W29.34x1.27
*   1" NPT            ...see 1.5/16-11.5, M33.40x2.21
*   1" BSP            ...see G1, W 1.5/16-11 W33.34x2.31
*   1" NPSH           ...see 1.295-11.5; hose thread
*   1 JIC             ...see 1.5/16-12; fittings/tubes, dash size -16, nominal inner dia 1"
===== 3/4" Cu pipe    3/4" 19.75mm nominal bore, 1" 25.40mm outer diameter pipe, plumbing copper pipe in USA/Canada
===== 1" Cu tube      DN25, 25.40mm outer-diameter tube; AS 1432 wall thick 1.63mm/16g (A/green, 4.75 MPa), 1.22mm/18g (B/blue, 3.50MPa), 0.91mm/20g (C/red, 2.56 MPa); AS/NZS 1571, wall thick 0.91mm (2.73 MPa), 1.22mm (3.70 MPa), 1.63mm (5.02 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
@   1-56
@   1-48
@   1-40              UNS (H28 1963)
@   1-36              UNS (H28 1963)
====1-32 UN           32UN, 32-thread, primary size, constant pitch series, UN (H28 1963)
 o  1-32 UN           lens mount, US standard series, male on lens, PH3.10
!o  1-32 UN 2A        lens mount, M25.4x0.794, CCTV, "C-mount" (cinema-mount), "CS-mount" (c-mount short), VERY common; for 16mm movie cameras, ANSI/SMPTE 76-1985; backfocus 17.53mm (C) or 12.5/12.526mm (CS) or 15.31mm (Bolex H8RX); up to 1" sensors; machine vision standard JEITA TT-4506 (Jul 1998); JIIA image size class II
 o  1-32 UN           inner thread on 30mm C30 optical tubes, eg. Thorlabs
 o  1-32              some lens mounting rings, for C-mount and CS-mount lens mounts, eg. Thorlabs
 o  1-32              optical filter, outer dia usual 25.2   aperture usual 19.5    C-mount
@   1-30
====1-28 UN           28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
*   1-27 GAS          ...see 1.006-27
====1-27 UNS          NS; 27-thread series, fine threads for thin-wall tubing; NSTC 1928 (light fixture tubing), UNS (H28 1963), ASME B1.1-2003 Appendix D
    1-27              in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    1-27              panel nuts
    1(-26) BSB        British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances; size also used in Germany
H   1-26 CEI          Original Cycle, British bicycles, 60°, historical
@   1-26 BSC          British Standard Cycle, original CEI, bicycles; (not in Guide to World Screw Threads)
@   1-26
 o  1-24 Whitw.       British camera lens flange fittings, R.P.S. standard
@   BC 1-24           BC1, 25.40x1.058, bicycle thread, general use, front fork shaft (also BC31/32); JIS B 0225
====1-24 BSC          British Standard Cycle, bicycles, 60°; steering columns
@   Fg25.4(-24)       25.400x1.058, bicycle screw thread, 60°, DIN 79012
    FG25.4            on bicycles, steerer tube; standard fork, British/ISO, most common
    FG25.4            on bicycles, pedals; LH+RH, 1"-24; Shimano Dyna Drive
====1-24 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
    1-24              vintage Harley Davidson motorcycles; chassis, fork stem, 1936-* "BT"
    1-24              on bicycles; threaded headsets, one-inch standard (UNS? BSC? BC?)
*   1-20 copper       ...see 1.155-20, W29.34x1.27
@   1-20 WS           Whitworth Special, Whitform
@   1-20 BSC          British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
=== 1(-20) UNEF       M25.40x1.27, primary size; SAE extra fine (1915/1926), UNJEF, ANEF (H28 1944), UNEF (H28 1950/1957), UNEF/UN (H28 1963), aeronautical (H28 1944), BS 1580:1962
c   1-20 UN           UNEF standard; 20UN, 20-thread, primary size, constant pitch series
!g  1-20 UNEF         gas bottle thread, CGA600, male on bottle; on small disposable gas bottles, 17 and 34 liters, eg. MAPP 16 oz, propane 14.1 oz, oxygen 16 oz, calibration gases; "US thread" (see 7/16-28 for EU thread); see also M24x2, M10x1
 %  1-20 UNEF         Swagelok fittings; series 1210, 3/4" tubes; 18mm tubes
 %  1-20              JIC tube fittings
 %  1.000-20 UNEF     conduit-to-panel fittings, MIL-PRF-24758-5, size K
 %  1-20              carburetor inlet fittings, less common than 7/8-20
 C  1-20 UNEF         connectors, eg. circular Maxi-Con-X Switchcraft connectors
 C  1-20 UNEF         circular connectors, DE Group Series 16, size 16/16S, "business-end" thread
 C  1-20              circular connectors, MIL-DTL-5015; size 18, fitting; size 16S/size 16, coupling (Conxall)
 C  1-20 UNEF         circular connectors, MIL-DTL-5015; size 16 and 16S, coupling (J) and accessory (H)
    1.000-20 UNEF     circular connectors, MIL-DTL-83723; size 14, mounting; size 16, shell/accessory
    1.0000-20 UNEF    circular connectors, MIL-DTL-38999; series I size 13 panel nut, series II size 11 panel nut
    1-20              panel nuts
    1-20              some industrial thermometer inserts
====1-18 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
 %  1-18              tube coupling, 3/4" tube, standard compression fitting with ferrule
 g  1-18              tube coupling, brake thread ("-12"), 3/4" tube, sleeve nuts on tubes;, in truck air brakes
@   25.40-16          CTC 25-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
@   ET1(-16)          W1-16. B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
====1-16 UN           16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957), UN (H28 1963); originally for adjusting collars, retaining nuts
 %  1-16              on oil filters; lube; unusual
    1-16              panel nuts
 w  1.00-16           (M25.4x1.59)   firearm rifle barrel/receiver thread; fits FN-FAL; 1.10"-12 tpi fits Large Ring Mauser
@   1-16 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@g  W25.4-14          "1"BS"; gas bottle neck thread, tapered 1:8, on smaller dia; 1.000-14; IS3224 type 4 size 2, SI no. 3b, "1.0-25AU" (AS2473.2), also BS 341
====1-14 NS           M25.4x1.81, ancient variant of UNF; "UNF" (frequent misnomer), "1"-SAE", ALAM automobile standard (Machinists Handbook 1909), SAE regular, ANF (NSTC 1921/1924/1928/1933, H28 1942/1944), "series C" (TM 9-254, 1958), NF (B1.1-1935, H28 1950), NS (H28 1957, B1.1-1949), UNS (H28 1963), aeronautical (H28 1944); more common "fine" than 1-12 UNF for hex-head bolts; removed from ANSI charts in 2003, not recommended for new designs
i   1-14 NF           more popular "fine" for hex-head bolts (cf 1-12 UNF for socket-head cap screws); driven by railways being more resistant to change? [ref]
i   1-14 UNS          common "fine" nuts stocked in hardware stores (as of 2004); causes troubles when 1-12 UNF is needed instead and is not stocked; however it is nonstandard, avoid in new designs
i   1-14 UNS          or "1-14 UNF"; said to be international standard for 1" fine; cf 1-12 UNF for Australian standard
i   1-14 UNS          B1.1-1935 lists 1-14 as fine, 1-12 is a departure from established US-British practices; industry sticks with 1-14, consideration given to revert UNF to 1-14, but not deemed important enough; third printing of B1.1-1949 maintains 1-12 UNF, lists 1-12 as bold and 1-14 as light type (Standardization, vol.22-23, Jan 1952)
!S  1"-14 UNS         "standard marine", marine antenna mounts, male on tripod/mount, male or female antenna
 S  1-14 UNS          some geodetic instruments, tripod mount, spring-mounted, by US Coast and Geodetic Survey; see also 3.1/2-8
 %  1-14 UNS          tube coupling, 5/8 ("-10"), O-ring face seal (ORFS, SAE J1453)
 %  1-14              JIC tube fittings
 %  1-14              on oil filters; hydraulic/transmission; rare
 %  1-14              on vented cap body grease fittings
 t  1-14              some milling machine arbor nuts
    1-14              common on vehicle spindle/axle stubs, central wheel mount
    1-14              panel nuts
 w  1"-14             firearm barrel end thread, common at .50 BMG; McMillian TAC-50 (.50), Armalite AR50 (.50), AR450 (.50)
*   1-12 STI          ...see 1.1083-12, 28.2x2.12 (screw thread insert)
H   1(-12) ADMF       Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 25.4x2.117
@   1-12 WS           Whitworth Special, Whitform
@   1-12              taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1(-12) UNF        M25.40x2.12, primary size (in old times, NF was 1-14), screw "W" (US), 12UN, SAE regular (or 1-14?), NS, 12AN, AN (NSTC 1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), N (B1.1-1935), UNF (H28 1950/1957, B1.1-1949), UNF/UN (H28 1963), JIS B 0212, BS 1580:1962; more popular "fine" for socket-head cap screws
c   1-12 UN           UNF standard; 12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
i   1-12 UNF          more popular "fine" for socket-head cap screws (cf 1-12 UNF for hex-head bolts)
i   1-12 UNF          said to be Australian standard for 1" fine; cf 1-14 UNF for US/"world" standard [ref]
    AN16              aircraft bolts, 1"-12 UNF-3A; AN36, clevis bolt, not for new designs after 1966; AN186, close tolerance, not for new designs after 1966
 %  1-12              on oil filters; lube, hydraulic, transmission; very common
 %  1.000-12 UN       shipboard stuffing tube, ASTM F1836, US, size B
 %  1-12 UNJF         ports in scientific apparatus vessels; according to: AS5202
 t  1-12 UNF          some woodturning lathe chucks; Myford ML8 Turnstyler
    1-12              panel nuts
    1-12              thread insert, external thread; keylocking extra heavy duty, 5/8-18, 5/8-11
@   1-12 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1-11.5 NPT        ...see 1.5/16-11.5, M33.40x2.21
*   1-11.5 NPSH       ...see 1.295-11.5; hose thread
*   1-11 BSP          ...see G1, W 1.5/16-11 W33.34x2.31
    1-11 Whitworth    older British oil switchgear, round copper stud connection to main contacts
    1-11              tube coupling, JIS 300, 1" ("-16"), tapered, or 30-deg male flare on male
@   1-10 TWF          Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====1(-10) BSF        British Whitworth Fine-pitch; W25.40x2.54; 55°; BS 84-1956; in British Standards Interim Report 7270-1919 (changed BSF to 1-12 around 1949? check); screw "W" (UK)
 t  1-10 BSF          some woodturning/metal lathe chucks, Atlas 10100; TL1000, Woodfast/Durden, also LH thread
@   1-10 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
    1-10              some hex-socket shoulder screws
 C  1.000-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 15, coupling ("business end")
L   1"-10 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg
@   1-10 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   1-9
*   1-8 STI           ...see 1.1624-8, 29.5x3.18 (screw thread insert)
H   1.000-8           Whitworth thread proposal, 1857 (replaces 1-8 designation from 1841)
@   1-8 TWC           Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1(-8) BSW         British Standard Whitworth; W25.40x3.175; 55°; also "continental Whitworth"; 1W8 (former JIS B 0210); BS 84-1956; Whitworth 1841; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 g  W1-8              gas bottle valve thread, DIN 477 No.8 (Germany, most Europe), male on bottle; toxic - BCl3
 g  W1-8              gas bottle valve thread, UNI 4408 (Italy), male on bottle; toxic - Cl2
 g  W1                gas bottle valve thread, ITC EP6 TIPO J (Spain), male on bottle; toxic/corrosive - HCl, HBr
 g  W1-8 LH           gas bottle valve thread, DIN 477 No.5 (Germany, most Europe), male on bottle; toxic - CO
 g  W25.4-8           gas bottle valve thread, AFNOR NF J (France), male on bottle; corrosive - Cl2
 g  W25.4-8           gas bottle valve thread, NEN 3268 RU 4 (Netherlands), male on bottle; toxic - Cl2, HCl, SO2
 g  W25.4-8 left      gas bottle valve thread, NEN 3268 LU 4 (Netherlands), male on bottle; toxic - HCN
H   1"-8              sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   1-8               Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1(-8) UNC         M25.40x3.175, primary size, 8UN, Sellers (1864), USS (Machinists Handbook 1909), 8AN, ANC (NSTC 1921/1924/1928), ANC/AN (NSTC 1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC/N (B1.1-1935), UNC (H28 1950/1957/1963), JIS B 0210, aeronautical (H28 1944), BS 1580:1962
c   1-8 UN            8UN, 8-thread, primary size, constant pitch; common on petrochemical fasteners, stud bolts, pipe flanges
    1-8               car engines, Cat 793 wheel hub BH
    1-8 UNC           on crane hooks; minimum size for #7 hook/crane, workload limit 3.81 tons (Crosby/Bullard)
    1-8               thread insert, external thread; EZ-Lok steel, 3/4-16, 3/4-10, M16x2; EZ-Lok steel extra heavy, 5/8-11
 t  1-8 UNC           woodturning lathe headstock nut/chuck, spanner 1"1/2, UNified Coarse, 38.1mm, dia 25.4mm; Sears 101.0x
 t  1-8 UNC           some woodturning lathe chucks; Delta, Rockwell, Golding, General, NOVA Comet (North America) and Mercury lathes; Nova Mercury Mini dual LH+RH
 t  1-8               pull stud retention knob for CAT50 tooling head, draw bars on some collet chucks with BT60 taper
L   1-8 ACME          for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
L   1-7 ACME          for leadscrews, Acme trapezoidal thread, angle 29-deg; very uncommon
H   1.0-6.58          Holtzapffel & Co. (1856), historical; 25.4x3.86; tap/die "A", comb-screw tool no.1
@   1-6               wooden thread, 60-deg V-thread, usual pitch (US tools - Bealltool) (see also 1/2-8, 3/4-6)
L   1"-6 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg; BS 1104:1957, class 2G/3G/4G/5G
@   1-5               wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 25mm
L   1"-5 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg; standard US size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C
    1-5 ACME          common on dumbbell handles (may be 1-4?)
@   1-4 taper         "Western Union thread", on glass telegraph insulators; from 1865, US standard as of 1920; taper 1.111 in/ft; 1/8" wide flat valley, 1/8" semicircular ridge (in the glass insulator female thread) [ref]
@   1-4 taper         "One inch", on porcelain high voltage insulators; taper 1:16 (0.75 in/ft); US standard as of 1920 (see also 1.3/8-4); form varies as of 1912, semicircular or V-grooves [ref]
L   1"-4 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg
L   1-4               ballscrew, for leadscrews
W   1-3.5             lag screws (modern)
W   1-3               coach and lag screws (Machinists Handbook 1909)
L   1-3               ballscrew, for leadscrews
L   1-2.5x2 square    standard square-thread taps Lead D'BL (lead 2/5", Machinists Handbook 1909)
L   1-2               ballscrew, for leadscrews
L   1-1               ballscrew, for leadscrews
L   1x.28             ballscrew, freewheeling, for leadscrews
@   M25.5x0.5         DIN 13-3
 o  M25.5x0.5         optical filter, outer dia usual 27.5   aperture usual 21; on some C-mount lenses
 o  M25.5x0.5         very common in machine vision, laboratories
@   1.006-27          gas (brass pipe) thread, size 1", 25.552x0.941; 27-thread series, fine threads for thin-wall tubing
    1.1/64-8          M25.8x3.175; oversized 1-8 UNC; on some guywire eye nuts, thimbleyes, twineyes
@   1.0193-9          STI-7/8-9, 25.9x2.82; screw thread insert thread, ASME B18.29.1
@   M26x0.35          DIN 13-2
@   M26x0.5           DIN 13-3, DIN 519 (3st)
 o  M26x0.5           optical filter, on some industrial telecentric lenses
 o  M26x0.5           lens mount, Schneider
 o  M26x0.6           lens mount, Arcturus binoviewer
 o  M26x0.706 (36tpi) lens mount, microscope objective size O7, BD mount, Mitutoyo; with large tolerance can also fit M26x0.75
 o  W26-36            microscope objective size O9
@   M26x0.75          DIN 13-4
 o  M26x0.75          microscope objective size O3, Nikon BD objectives, apparently less common
 o  M26x0.75          lens mount, some thermal imaging lenses
 o  M26x0.75          some lens mounting rings
    M26x0.75          panel nut on RM24 panel connector
====M26x1             DIN 13-5, SI M.MD, ISA D (1940)
 %  M26x1             standard bioreactor lid port; "19mm port" (alternative to Rd28-8), female on port, standard port size on headplate/lid; on probes and stirrer shafts
    M26x1             on bicycles, steerer tube Austria, Diamond
@   M26x1.25
====M26x1.5           ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M26x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M26x1.5           metric pipe thread DIN 7631
 g  SI 26x1.5         gas bottle valve thread, AFNOR NF G (France), female on bottle; oxidizer - N2O
 g  M26x1.5           gas bottle valve thread, ITC EP6 TIPO G (Spain), female on bottle; oxidizer - oxygen over 23%
 %  M26x1.5           tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M26x1.5           tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 18mm tube (light)
 %  M26x1.5           tube coupling, 18mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M26x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; DIN "L", 12mm tube tube
 %  M26x1.5           compression fitting, 18mm tube: metric Norgren/Enots
 %  M26x1.5           car engine sensor port, oil temperature; Mercedes (M22x1.5?)
 %  M26x1.5           on oil filters; lube; unusual
    M26x1.5           pneumatic cylinder
    M26x1.5           compressor oil sight
 %  M26x1.5           seen on some metric heating radiator piping systems
 w  M26x1.5 LH        firearm barrel end thread, PAP M92/M85 (7.62x39/.223 Remington), Zastava Yugo M92 and M85 ("Krinkov")
    M26x1.6           steering wheel nut, Tatra
====M26x2             SI M.MB, ISA B (1940), DIN 13-7, DIN 247
 g  M26x2             diving cylinders/regulators, EU-mandated for gases above 22% oxygen (Nitrox, trimix, oxygen) instead of M25x2, regulator end on valve; converters common to G5/8, M25x2
    M26x2             boat propeller nut, on 35 and 40mm-dia shafts
 p  GME 30.37         26x2.17, 26/22, plastic bottle thread; 678°; carbonated beverages to 8.4g/l, 2L bottles; used in Central and Eastern Europe; occasional in Latin America, Africa, India [ref]
 p  GME 30.40         26x2.3, 26/22, plastic bottle thread, AB26CSDT5 lid, AB26CSD-T1 lid; 678°, tethered cap; carbonated beverages to 8.8g/l, 3L bottles, or 10.2g/l, 2L bottles; new in Europe, planned for Africa, Latin America [ref]
 p  GME 30.41         26x2.3, 26/22, plastic bottle thread, AB26CSD-12 lid; 678°; carbonated beverages to 8.8g/l, 3L bottles, or 10.2g/l, 2L bottles; markets under consideration [ref]
 p  GME 30.38         26x2.5, 26/22, plastic bottle thread; 505°; carbonated beverages to 7g/l, 1.5L bottles; occasionally used in Eastern Europe; main neck for still and sparkling water in Italy [ref]
@   M26x2.5
H   W26x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W26x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   26x2.78           Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   26x3              SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M26x3             "4th choice/avoid", "metric special", "French metric" (Machinists Handbook 1909)
@   S26x3             buttress thread, fine, 33°, DIN 514
 p  KS26(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg; secondary size
 p  KT26(x3)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
L   Tr26x3            trapezoidal fine, 30°, DIN 103; for leadscrews
 p  SP26(-8)          26SP, plastic bottle thread, SP-100,103, uncommon
@   Rd26(-8)          round/knuckle thread, DIN 405
H   26x3.2 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh26x3.2          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
@   S26x5             buttress thread, coarse, 33°, DIN 513
L   M26x5 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; metric
L   Tr26x5            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
@   E26(-7)           Edison thread (E thread DIN 40400), 7tpi; lightbulbs, Medium (MES, ES); Standard 120 V lamps; NSTC 1928/1933 (1.031..1.037 base, 1.045..1.053 socket), H28 1942/1944
 p  26-2.7x4          glass bottle, threaded crown finish, 4-start; 26-501, 26-531, 26-535, 26-540, 26-545, 26-550, 26-555, 26-565, 26-600 (differ by neck shape below thread)
 p  PCF-26P           26-2.12x3, plastic bottle thread, three-start, 2.12 tpi per start, 0.25 in travel per turn, 180° 120° apart; flatwater; -1 and -2 versions differ by 2mm diameter of under-thread sleeve [ref][ref]
 p  GME 30.28         26x6.5x3, 26/22, EN 16594, 26/22-12-3/6.5, plastic bottle thread; 180° 120° apart; flatwater; main neck for still water in Italy, hard discount Germany, used with other necks in USA [ref]
 h  1.025-20          antique geodetic/surveying gear, pre-standard, female on tripod; Buff & Buff and C.L. Berger & Sons - spring loaded three screw leveling tripod head.
@g  W26.194-14        "1.1/32"; gas bottle neck thread, tapered 1:8, on smaller dia; IS3224 type 4 size 2 3.5 turns oversize; also BS 341
@g  1.030-14 NGO      gas bottle valve thread, 1.030-14 M26.16x1.61 male, 1.035-14 M26.29x1.81 female; valve outlet #620 (w/ groove), #640 (w/ 1/28 NGT RH INT), #660 (w/o groove), #670 (LH)
 g  1.030-14 NGO      gas bottle valve thread, CGA 660 (USA/Canada), male on bottle; toxic - hydrogen sulfide
 g  1.030-14 NGO LH   gas bottle valve thread, CGA 679 (USA/Canada), male on bottle; high-pressure - nitrogen
@g  1.034-14 NS       gas bottle valve thread, 1.034-14 male, 1.035-14 female; H28 1944 (Cl2)
====1.035-40 UNS      M26.29x0.635, Thorlabs SM1
 o  1.035-40          lens mount, 26.29x0.635; microscope objective; Thorlabs SM1
@g  1.035-14 NGO      gas bottle valve thread, 1.030-14 M26.16x1.61 male, 1.035-14 M26.29x1.81 female; valve outlet #620 (w/ groove), #640 (w/ 1/28 NGT RH INT), #660 (w/o groove), #670 (LH)
 g  1.035-14 NGO      gas bottle valve thread, ABNT 262-1 (Brazil), female on bottle; toxic - SO2, Cl2
====3/4-14NPSH        1.035-14, 3/4 NPSH, 26.29x1.814, firehose/hydrant coupling thread, NPSH/IPT 3/4"; NSTC 1933, H28 1942/1944, ANSI/ASME B1.20.7
 %  3/4-14NPSH        firefighting, booster hose, 3/4" hoses (NFPA)
 %  3/4-14NPSH        firefighting, forestry hose, 3/4" hose (USDA 5100-107d specification)
 %  R3/4-24           compression fitting, 1/2" tube: imperial Norgren/Enots
@   26.441-14         CTG 22-14, thick steel conduit thread, 55°; Japanese, JIS C 8305
@   3/4-14 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G3/4(-14)         G26.441x1.183, W1.041-14, ~W 1.1/32-14, W26.441x1.81, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
!%  G3/4              garden faucets, most common garden hoses, UK/Europe; see also 1.1/16-11.5 GHT (3/4 GHT) for US
 %  G3/4              faucet aerators, uncommon
 %  G3/4              on flareless tube fittings, for 20 mm tube
 %  G3/4              compression fitting, 5/8" tube: imperial WADE
 g  G3/4              gas bottle valve thread, AS 2473.2 Type 34 (Australia/NZ), male on bottle; refrigerant - R134a
 g  G3/4              gas bottle valve thread, DIN 477 No.9 (Germany, most Europe), male on bottle; oxidizer - oxygen
 g  G3/4              gas bottle valve thread, DIN 477 No.12 (Germany, most Europe), female on bottle; oxidizer - N2O to 3 liters
 g  G3/4              gas bottle neck thread, on SCUBA diving cylinders for oxygen but G5/8 is more commonly used here, DIN-477 no.9, neck thread, female on cylinder
 g  G3/4              gas bottle neck thread, valve mounts in some old US SCUBA diving cylinders
 g  G3/4              common larger food-grade CO2 bottles (see also W21.8-14, converters available); common CO2 or oxygen welding bottles in Germany (Rothenberger Allgas, Roxy)
 %  3/4-14 BSPP       on hydraulic pipes with outer dia approx. 1.1/16"
 %  3/4-14 BSP        on oil filters; hydraulic; very common
 %  G3/4-14           fire extinguishers, outlet thread, female on valve, big 25-100kg ones; also G1/2-14
 %  G3/4-14           fire extinguishers, dip tube, female on valve; uncommon
 %  3/4-14 BSP        drum plug, on British mild steel heavy duty drums/barrels, smaller bung (larger is 2.1/4 BSF), thread length 0.378" minimum
    G3/4              tap head (valve) hot/cold water, bottom thread T1 (corresponding top thread T2 commonly M24x1)
    G3/4              backnut for kitchen/bathroom faucets
 p  G3/4              on some sports water bottles, female on bottle
    G3/4-14           on a GPS antenna, Garmin standard - G3/4x14 - 14 TPI, 26.4mm outer, 24.5 inner
 t  3/4-14 BSP        some woodturning lathe chucks; TL1000 (pre 1986), also LH
@   M26.5x0.5         DIN 13-3
 o  M26.5x0.5         lens mount, some Carl-Zeiss Mikrotar objectives, Rodenstock Apo-Ronar 9/150mm, uncommon
@o  1.0433-36 NS      26.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
 o  M26.5x0.75        riflescope objective lens thread, 22mm,24mm Meopta scope
@g  1.045-14 NGO      gas bottle valve thread, AS 2473.2 Type 51 (Australia/NZ), female on bottle; inert over 20 MPa - nitrogen
=====3/4" pipe        1.050 in, 26.67 mm outer diameter, DN 20, NPS 3/4, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 20mm, ASTM copper tube 22mm; ASTM B42 copper B43 red brass, wall th 0.114"/2.9mm standard, 0.157"/3.99mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
@g  NPS 3/4-14        gas bottle valve thread; H28 1942/1944 (male on valve, dichlorodifluoromethane (US Navy))
=== NPT 3/4(-14)      1.046-14, ~1.1/16-14, M26.568x1.81; ANPT; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944 SGT with 1:8 taper; NGT(Cl)-1/2/3/4/5 oversized by 0/4/8.5/14/28 turns as per CGA V-1 for chlorine; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 %  3/4(-14) NPT      standard pipe fitting, popular for improvised silencers; Napa 4003 fuel filter, Wix 24003 fuel filter
 g  3/4-14 NPT        gas bottle neck thread, female on bottle; H28 1944 (acetylene (also 1-11.5 NPT), air water/oil pumped, anhydrous ammonia, CO2, chlorine (also oversized as of NGT(Cl)), He, H2, nitrogen water/oil pumped, O2 (also 1/2-14 NPT, 1-14 NPT); length 7/8")
 g  3/4-14 NPSM       valve mounts in many US diving cylinders, deceptively similar to M25x2; standard in Australia on aluminium/steel cylinders
 g  3/4-14 NPSM       gas bottle neck thread, female on bottle, parallel; JIS B 8246, IS 3224:2014, SI no. 3; equivalent to 3/4-14 NGS-2A (AS 2473.2)
 g  3/4-14 NGT        gas bottle neck thread, female on bottle, taper 1:16; IS3224 type 1 size 2, SI no. 1e, also CGA V-1
 g  3/414 NPT         LPG/propane/butane connection, SNI 1591:2008 b/c, ABNT NBR 13794 (according to ABNT NBR 8614)
    3/4-14 NPT        industrial flamerods, sight glass ports
 %  3/4-14 NPT        drum plug, common on steel drums/barrels, smaller bung (larger is 2" NPT), for 19mm opening (DN20)
 w  1.3/64-20         Japanese WW2 bomb fuzes (Whitworth?); Type 97 Rail Initiator B-6(a), for 31kg practice bomb
=== 3/4-11.5 NHR      1.052-11.5 NHR, .75-11.5 NHR, M26.72x2.209; National Hose, hose thread for 1/2, 5/8, 3/4 hoses, thin metal fittings; for garden hoses; see also 1.0625-11.5 for NH
@   1.1/16-32
====1.1/16-28 UN      28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.1/16-27
H   1.1/16-26 CEI     Original Cycle, British bicycles, 60°, historical
@   1.1/16-26 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   1.1/16-24 UNS
====1.1/16-20 UN      20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  1.1/16-20 UN      Swagelok fittings, 3/4" tubes
@   1.1/16-20 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
=== 1.1/16-18 UNEF    M26.67x1.411, secondary size, ANEF (H28 1944), NEF (H28 1950/1957), UNEF 2nd (H28 1963), aeronautical (H28 1944)
    1.0625-18 UNEF    circular connectors, MIL-DTL-5015; size 18, accessory (H) (1.125-28 UNEF for coupling)
 C  1.063-18 UNEF     circular connectors, MIL-DTL-83723; size 16, coupling ("business end"); size 18, shell/accessory
    1.0625-18 UNEF    circular connectors, MIL-DTL-38999; series I size 15 accessory; size 19 shell/accessory, code F, coupling is 1.250-10x3
====1.1/16-16 UN      16UN, 16-thread, secondary size, constant pitch series, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN (H28 1957, H28 1963 (2nd)); originally for adjusting collars, retaining nuts
 %  1.1/16-16         tube coupling, 3/4 ("-12"), SAE inverted flare (SAE J512, 45° female on male, 42deg male on female), common in cars
 %  1.1/16-16         tube coupling, 3/4 ("-12"), male pilot, O-ring pilot threads, common in automotive and commercial air conditioning
@   1.1/16-14 UNS
 %  1.1/16-14         tube coupling, 3/4" tube, standard flare fitting
 %  1.1/16-14         tube coupling, 3/4 ("-12"), SAE 45-deg flare (SAE J512), flare male on male
 %  1.1/16-14         tube coupling, 3/4 ("-12"), female pilot, O-ring pilot threads, common in automotive and commercial air conditioning
 %  1.1/16-14         JIC tube fittings, for 3/4 tube
H   1.1/16(-12)       Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 26.988x2.117; less common?
@   1.1/16-12         taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====1.1/16-12 UN      12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957, H28 1963 (2nd)), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
    AN17              aircraft bolts, 1.1/16-12 UNF-3A; AN37, clevis bolt
 %  12AN              1.1/16-12 fitting thread, usually with 37-deg flare; common on aviation and racing car fuel systems
 %  1.1/16-12 UN      tube coupling, 3/4 ("-12"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  1.1/16-12         tube coupling, 3/4 ("-12"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  1.1/16-12         tube coupling, 3/4 ("-12"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  1.1/16-12         JIC tube fittings, for 3/4 tube
 %  1.1/16-12 UN      ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514; AS5202 (for UNJ)
 h  1.062-12          antique geodetic/surveying gear, pre-standard, male on tripod
=== 3/4-11.5 NH       1.1/16-11.5, 26.99x2.209, "3/4 UNH", "GHT", garden hose thread, US standard; see also G3/4; for 1/2, 5/8 and 3/4 garden hoses; NSTC 1921/1924/1928/1933, H28 1942/1944 (American National Hose Coupling), NFPA 1963 "Standard for Fire Hose Connections", later by ANSI-ASME B1.20.7
 %  1.0625-11.5 NH    .75-11.5 NH, 1.1/16-11.5 NH, M26.99x2.209; National Hose, hose thread for 1/2, 5/8, 3/4 hoses; see also 1.052-11.5 for NHR
 %  3/4-11.5NH        firefighting, forestry hose, 3/4" hose (Garden Hose Thread)
@   1.1/16-10
 C  1.0625-10x2       circular connectors, MIL-PRF-28876, MIL-PRF-64266, size 15, "business end" coupling; 60° stub thread, dual-lead; M22x1 for backshell (MIL-PRF-64266)
@   1.1/16-8          V.St'd (Machinists Handbook 1909)
====1.1/16-8 UN       8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   1.1/16-7          USS (Machinists Handbook 1909)
 w  1.055-20          (M26.80x1.27)  firearm rifle barrel/receiver thread; fits Savage 110/112
 h  1.058-20          antique geodetic/surveying gear, pre-standard, female on tripod; C.L. Berger & Sons - spring loaded three screw leveling tripod head.
@g  W26.987-14        "1.1/16"; gas bottle neck thread, tapered 1:8, on smaller dia; IS3224 type 4 size 2, 7 turns oversize; also BS 341
@   M27x0.35          DIN 13-2
@   M27x0.5           DIN 13-3, DIN 519 (2st)
 o  M27x0.5           optical filter, on some C/CS-mount lenses; some thermal imaging lenses
 o  M27x0.5           common in machine vision
 o  M27x0.5           lens mount; on Spiratone fish-eye 0.15x attachment, male on atachment
====M27x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M27x0.75          lens mount, microscope objective size O4, Zeiss (eg. A-plan), Nikon CF Plan infinity/0 BD objectives, LOMO EPI-objectives
    M27x0.75          panel nut, RS50 connector nut
=== M27x1             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, DIN 13-5, SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
 o  M27x1.0           lens mount, microscope objective; on some optical lab kinematic mounts
 o  M27x1             some lens mounting rings, eg. in laser optics
 C  M27x1.0           RS50 connector sleeve nut
@   M27x1.25
=== M27x1.5           ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M27x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16; secondary size?
 %  M27x1.5           tube coupling, French millimetric 24-deg seat, 18mm/20mm(?) tube
 %  M27x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 18mm tube
 %  M27x1.5           tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 20mm tube; type J (39.2 MPa), 18mm tube
 %  M27x1.5           tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 37deg and 45° inverted flare (GB5650), 18mm tube; O-ring face seal (JB1887), 16mm tube
 %  M27x1.5           on hydraulic systems and pressurized air systems on vehicles
 %  M27x1.5           on oil filters; lube; rare
 %  M27x1.5           some banjo bolts
    M27x1.5           compressor oil sight
    M27x1.5           cable gland, PG21    cable 13..18  33      // G3/4
    M27x1.5           compression fitting, 20mm tube: metric WADE
    M27x1.5           bearing holder axle nut, BMW
    M27x1.5           backnut for kitchen/bathroom faucets and valves, shower handset holders with hose pullout, less common than M29x1.5
    M27x1.5           tap head (valve) hot/cold water, bottom thread T1 (corresponding top thread T2 commonly M16x1)
 t  M27x1.5           on some tooling collets; internal thread in shank of an ER40 collet, ER DIN 6499
=== M27x2             common; ISO 261 2nd, ISO secondary fine (coarse), ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, JIS B 0211, MJ, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 g  W27x2             gas bottle valve thread, AS 2473.2 Type 60 (Australia/NZ), male on bottle; nonflammable to 20 MPa - air
 g  W27x2             gas bottle valve thread, AFNOR NF K (France), male on bottle; corrosive - HCl
 g  W27x2             gas bottle valve thread, AFNOR NF L (France), male on bottle; oxidizer - inert + oxygen over 21%
 g  W27x2             gas bottle valve thread, AFNOR NF P (France), male on bottle; oxidizer or corrosive - N2O, NO2
 %  M27x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M27x2             ISO 6149 hydraulic ports
 %  M27x2             on oil filters; lube, hydraulic; rare
 %  M27x2.0           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M27x2             tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M27x2             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
    M27x2.0           pneumatic cylinder
    M27x2             compressor oil sight
    M27x2             common on vehicle spindle/axle stubs, central wheel mount
    M27x2 LH          on some Zetor trucks
    M27x2             stud bolt size, fine; ISO 898-1
@   M27x2.5
H   W27x1/10"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   27x3              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M27(x3)           M27, "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909, International (Zurych 1898, Machinist Handbook 1909)), JIS B 0209, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse (high strength structural steel fasteners only), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M27               stud bolt size, ISO 898-1, EN 1993-1-8
    M27x3             high-strength injection structural bolts, DIN 6914
    M27               railroads, fish bolt (on fish plates on rails); Russian standard, 160mm long, GOST 11530
@   E27(-7)           Edison thread (E thread DIN 40400), 26mm, 7tpi (3.62mm); lightbulbs, some fuse holders, Medium (ES), European Medium; BS 98:1962, "Medium"; Standard 230 V lamps; most common in UK (also bayonets there), Europe
 p  GME 30.23         26.7x6.35x3, DIN EN 16066, 26.7/21.8-17-3/6.3, 27mm/26.7mm US, plastic bottle thread; 3-start, 180°
 p  GME 30.24         26.75x9x3, DIN EN 16067, 3-start Alaska, 26.7/21.7-16.8-3/9, plastic bottle thread, 120° turn, 16.8mm height; juices, mineral/spring waters, RTD tea, energy drinks
 p  27-1x3            glass lug vacuum-seal bottle, 3-start; 27-2000; FD 146, WGF-146A (regular)
H   27.4x3.540        FS -12, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -12, 1.0787-7.2
    1.08-4 ACME       broomstick handles, larger US standard, less common than 3/4-5 ACME, 27.43x6.35
@   M27.5x0.5         DIN 13-3
    1.3/32-32         on some cameras
@g  W27.781-14        "1.3/32"; gas bottle neck thread, tapered 1:8, on smaller dia; IS3224 type 4 size 2, 10.5 turns oversize; also BS 341
@   PZ27.8(-14)       gas bottle neck thread; tapered, Whitworth; PZ39.0, PZ30.3, PZ27.8, PZ19.2; GB 8335:2011 (China),  ISO 11363-1:2010
 g  PZ27.8-14         gas bottle neck thread, fire extinguishers, CO2 bottles, female on bottle, most common (see also PZ19.2-14, M25x2 for aluminium bottles, 1-11 NPT)
@   27.897x3          STI-M24x3, screw thread insert thread, DIN 8140-2
===== 28mm Cu tube    28mm outer-dia tube; ASTM B88M type A/1.6mm, B/1.2mm, C/0.9mm; EN 1057, wall th 0.9(X),1.0,1.2(Y),1.5mm, also soft PVC-coated 1.2mm, 0.9mm chrome-plated; BS 2871, table X (wall th 0.9mm, 4 MPa), Y (1.2mm, 4.2 MPa), Z (0.6mm, 3.2 MPa); copper pipe in Europe
@   M28x0.35          DIN 13-2
@   M28x0.5           DIN 13-3, DIN 519 (3st)
 o  M28x0.5           lens mount, Carl-Zeiss Tessar, uncommon
 o  M28x0.5           lens mount, on some Schneider-Kreuznach photo enlarger lenses
@o  1.1024-36 NS      28.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M28x0.75          DIN 13-4
 o  M28x0.75          microscope objective size O5, apparently less common, Carl-Zeiss Protar
 o  M28x0.75          lens mount, some thermal cameras; back flange dist. 13mm
 o  M28x0.75          optical filter thread, on Nikon Coolpix 950 camera, Mir-20M, Zodiac-2M MS fisheye
    M28x0.75          cable clamp nut on RM31 connector, cord clamps sleeve nuts
====M28x1             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MD, ISA D (1940), ISA D (1940), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 %  M28x1             faucet aerators, female on faucet, on bathtub spouts
 %  M28x1             heating radiator valve thread, outside for thermostatic heat attachment; Vama brand
    M28x1             diesel injector nozzle cap nut - Delphi
    M28x1             circular connectors, MIL-DTL-38999; series III,IV size 15 panel nut; size 19 shell/accessory, code F, coupling is 1.250-10x3
@   M28x1.25
====M28x1.5           ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M28x1.5           fire extinguishers, water/foam/powder, small, 1-3 kg; female on bottle; uncommon
 %  M28x1.5           on flareless tube fittings, for 20 mm tube
 %  M28x1.5           heating radiator valve thread, outside for thermostatic heat attachment; most common (Herz, Comap, Markaryd, Pettinaroli, T+A); also on some thermostatic valves
    M28x1.5           bearing retaining locknut, "KM56", ISO 2982 (1971)
 w  M28x1.5           firearm barrel end thread, female on barrel, on Diana 56 Target Hunter air rifle
 w  M28x1.5           WW2 German artillery fuze, 3,7cm Kpf.Z.Zerl.P/Fg/Pv, point detonation self destruction, in tip, for HE/HEI shells 3,7cm Flak 18 and 36
====M28x2             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
 %  M28x2             on some cable glands
 %  M28x2             on some pipes and fittings
 %  M28x2             some hydraulic fittings (M28x2, M36x2, M42x2, M48x3)
!S  M28x2             on lamps, lampshade thread, "M28", for E14 lightbulb thread lamps, DIN 49689 (M25x1 internal on throat of some lightbulb holders; M8x1, M10x1 can be in base); see also M33x1.5 (UNO), M38x2.5, M40x2.5 (E27)
H   W28x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   M28x2.5
!p  PCO1881           28x2.7, PCO-1881, GME 32.04, 28/22-17-1/2.7, plastic bottle thread, "short neck PCO", most common on CSD (carbonated soft drinks); newer Coke bottles (650°, 27.4 outer dia, 24.2mm thread base dia, 25.07mm top outer dia, 2.7mm/0.106in pitch, 4mm shorter than PCO-1810, 1.5g lighter) [ref]
 p  28x2.8            PCO Corvaglia, plastic bottle thread, 744deg; replaces PCO-1810; new, less common than PCO-1881
H   28x3.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   28x3              SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M28x3             "4th choice/avoid", "French metric" (Machinists Handbook 1909), DIN 13-8, DIN 246
    M28x3             standard reinforced concrete rebar couplers
 p  28x3              German bottle closure thread series; depth 1.02mm, crest radius 0.79mm, root radius 0.60mm
 p  GL28(x3)          on glass containers, knuckle thread DIN 168-1; 60° internal, 30° external; some lab glassware - Chromsystems, Recipe, Sigma 500mL buffer containers; cosmetics roll-on applicators
 p  SG28x3            on plastic bottles
 p  ND28(x3)          on plastic bottles
 p  DIN 28            on bottles
@   S28x3             buttress thread, fine, 33°, DIN 514
 p  KS28(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg
 p  KT28(x3)          for plastic containers, trapezoidal thread DIN 6063-2
L   Tr28x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   28x3.125          Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   28x3.2 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh28x3.2          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
@   Rd28(-8)          round/knuckle thread, DIN 405
 %  Rd28-8            standard bioreactor lid port; "19mm port" (alternative to M26x1), female on port, standard port on headplate/lid
!p  PCO1810           28-8, PCO-1810, plastic bottle thread, GME 32.03, USA/international; most common on CSD (carbonated soft drinks), replaced by PCO-1881; old Coke bottles (720°, 27.43 outer dia, 1.08 in dia, 25.07 mm thread base dia, 21.74 mm inner dia, 3.8mm/0.125in pitch) [ref]; PCO181x and PCO182x differ just by the below-thread portion
 p  PCO1811           28-8, PCO-1811, plastic bottle thread, short bottles; single-start 650°; CSD (carbonated soft drinks); uncommon
 p  PCO1815           28-8, PCO-1815, plastic bottle thread, USA; 720°; CSD (carbonated soft drinks) [ref]
 p  PCO1816           28-8, PCO-1816, plastic bottle thread, Latin America; 720°; CSD (carbonated soft drinks); less common than PCO1810 and PCO1881 [ref]
 p  PCO1817           28-8, PCO-1817, plastic bottle thread, Latin America; 720°; CSD (carbonated soft drinks) [ref]; SmartWater bottle
 p  PCO1820           28-8, PCO-1820, plastic bottle thread, South Africa; 720°; CSD (carbonated soft drinks) [ref]
 p  PCO1823           28-8, PCO-1823, plastic bottle thread, South Africa; CSD (carbonated soft drinks); thinner threads, similar to SP [ref]
 p  Alcoa 1716        28-8, single-start, 509°45';; international [ref]
 p  Alcoa 1788        28-8, single-start, 509°45';; Japan; slight thread top shape difference to 1716 [ref]
 p  BPF-C             28-8, 28mm BPF-C, plastic bottle thread, 630° (old, mostly disappeared); international; CSD (carbonated soft drinks) [ref]
 p  28-8              glass bottle, ONORM A 5005, German reusable 0.7L and 1L, "Normbrunnenflasche", "Brunneneinheitsflasche", "Perlenflasche"; 27.65 outer dia, 25.25 thread base dia, 17 inner dia; roll-on finish [ref]
 p  28-8              glass bottle, 28-1630 roll-on finish; 28-1655 top-and-side seal finish for nonrefillable service
 p  SP28(-8)          SP-100, plastic bottle thread; atypical pitch for SP?
 p  28ROPP(-8)        also PP28, ROPP28 (Roll-On Pilfer Proof); alternative to coarser SP-28/410; single-thread 720°; slightly different thread form to GPI 400/415/4xx ones; pharmaceutical bottles
 p  28-7              glass bottle, top-and-side seal finish; 28-1651
@   Rd28(x4)          round/knuckle thread, DIN 20400
 p  28-6              glass bottle thread, British, BS 1918:1953; R-4 finish, R-3/2 finish; round 60°, main dia 27.3mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  28-6              glass bottle, roll-on finish; 28-1620
!p  SP28(-6)          28SP, 28SP4xx, glass/plastic bottle thread, SP-200,400,410,415,430,444,485; 28/4xx;4.23mm pitch; lab bottles; 400/410 with spray/pump (common); 28-400 common in industry, on beverage bottles. 28-410 on trigger sprays; 28-480 for food canning;  hydration bottles and filters - SP-415, Sawyer collapsible bottle, Evernew bottle, Sawyer squeeze filter; SP-400, old Platypus bottles; SP-410, new Platypus bottles, Sawyer mini filter; SP-425, HydroBlu Versa Flow [ref]
 p  DM28(-6)          also W28; plastic bottles
@   S28x5             buttress thread, coarse, 33°, DIN 513
L   Tr28x5            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 p  Obrist-28         28x3x3, plastic bottle thread, three-start, 3mm per start, 9mm travel per turn, 120° 120° apart; flatwater; 18mm and 19mm versions [ref][ref]
@   1.104(-20)        BS copper pipe thread, BScopper, 7/8" inner dia; W28.04x1.27
@   1.1083-12         STI-1-12, 28.2x2.12; screw thread insert thread, ASME B18.29.1
====Pg-21             28.3-18, 28.3x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG21              some cable glands for up to 21mm cable
@   M28.5x0.5         DIN 13-3
 o  M28.5x0.5         on astronomy 1.1/4 (1.25", 31.8mm) eyepieces
 o  M28.5x0.6         optical filters; on astronomy 1.1/4 (1.25", 31.8mm) eyepieces; common
 o  M28.5x0.6         some lens mounting rings
*   1.1/8" BSPT       ...see W1.492-11, W37.897x2.309, taper, high pressure copper
===== 1" Cu pipe      1" 25.40mm nominal bore, 1.1/8" 28.575mm outer diameter pipe; ASTM B88 type K/0.065"/1.65mm, L/0.050"/1.27mm, M/0.035"/0.89mm; plumbing copper pipe in USA/Canada
===== 1.1/8" Cu tube  28.575mm outer-diameter tube; AS/NZS 1571, wall thick 0.91mm (2.42 MPa), 1.22mm (3.27 MPa), 1.63mm (4.43 MPa), 1.83mm (5.01 MPa)
 o  1.1/8-42          M28.575x0.605, optical filters in astronomy, industry standard for 1.25" filters (except Questar/Brandon)
 o  1.1/8-40          on astronomy 1.1/4 (1.25", 31.8mm) eyepieces
@   1.1/8-32 UNS
 o  1.1/8-32 UNS      lens mount, US standard series, male on lens, PH3.10
====1.1/8-28 UN       28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
@   1.1/8-27
@   1.1/8(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
H   1.1/8-26 CEI      Original Cycle, British bicycles, 60°, historical
@   1.1/8-26 BSC      British Standard Cycle, bicycles, 60°; motorcycle and tandem steering columns
    1-1/8-26          on bicycles; thread headset, 1-1/8 inch standard
@   1.1/8-24 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
    1.1/8-24 UNS      panel-nut/screw-in mount for some acoustic alert sirens
    1.1/8-24          on bicycles, steerer tube MTB
H   1.1/8-20 CEI      Original Cycle, British bicycles, 60°, historical
@   1.1/8-20 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
====1.1/8-20 UN       20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
 %  1.1/8-20 NF       Swagelok fittings; series 1410, 7/8" tubes; 20mm/22mm tubes
=== 1.1/8(-18) UNEF   M28.575x1.411, primary size, SAE extra fine (1915/1926), ANEF (H28 1944), NEF (H28 1950/1957), UNS/UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
 %  1.1/8-18          tube coupling, 7/8" tube, standard compression fitting with ferrule
 %  1.1/8-18          JIC tube fittings
 %  1.1/8-18 UNEF     ports in scientific apparatus vessels; according to: 6M152, AS1300, AS4201, PS10035
 C  1.1/8-18 UNEF     circular connectors, DE Group Series 16, size 18/18M, "business-end" thread
 C  1.1/8-18          circular connectors, MIL-DTL-5015; size 20, fitting; size 18, coupling (Conxall)
 C  1.125-18 UNEF     circular connectors, MIL-DTL-5015; size 18, coupling (J) (1.0625-18 for accessory)
    1.125-18 UNEF     circular connectors, MIL-DTL-38999; series I size 15 panel nut, series II size 13 panel nut
    1.125-18 UNEF     circular connectors, MIL-DTL-83723; size 16, mounting nut
 h  1.125-16          antique geodetic/surveying gear, pre-standard, female on tripod
====1.1/8-16 UN       16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957, H28 1963); originally for adjusting collars, retaining nuts
 %  1.1/8-16          on oil filters; lube, hydraulic, transmission; common
    1.1/8-16          car wheel nuts
====1.1/8-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 g  1.1/8-14 UNS      gas bottle valve thread, CGA 705 (USA/Canada), male on bottle; toxic - ammonia
*   1.1/8-12 STI      ...see 1.2333-12, 31.3x2.12 (screw thread insert)
H   1.1/8(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 28.575x2.117
@   1.1/8-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.1/8(-12) UNF    M28.575x2.117, primary size, 12UN, SAE regular, 12AN, ANF (NSTC 1921/1924), ANF/AN (NSTC 1928/1933, H28 1942/1944), UNF/UN (H28 1963), "series B" (TM 9-254, 1958), NF/N (B1.1-1935), UNF (H28 1950/1957), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
c   1.1/8-12 UN       UNF standard; 12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
    AN18              aircraft bolts, 1.1/8-12 UNF-3A
 g  1.1/8-12 UNF      gas bottle valve thread, parallel, female on bottle; JIS B 8246, IS 3224:2014, SI no. 2
 %  1.1/8-12 UNF      on some tube fittings, blowdown and packing injection fittings
 %  1.1/8-12          on oil filters; lube, hydraulic; rare
 t  1.1/8-12 UNF      some woodturning lathe chucks; Taiwanese lathes
 t  W1.1/8-12         some woodturning/metal lathe chucks; Myford Mystro Masterlathe (New Zealand); Seneca Falls Star (BSW?)
    1.1/8-12          thread insert, external thread; keylocking heavy duty, 3/4-16, 3/4-10
*   1.1/8-11 BSPT     ...see W1.492-11, W37.897x2.309, taper, high pressure copper
    1.1/8-11 Whitw.   older British oil switchgear, round copper stud connection to main contacts
@   1.1/8-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
@   1.1/8-9           Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   1.1/8(-9) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
H   1.1250-8.25       Holtzapffel & Co. (1856), historical; 28.58x3.08, 9/8" dia; tap/die "7-inch center mandrel nose", comb-screw tool no.2
====1.1/8-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950/1957), UN (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 t  1.1/8-8 UN        some woodturning lathe chucks
H   1.1/8-7           Whitworth thread proposal, 1841; as 1.125-7, 1857
*   1.1/8-7 STI       ...see 1.3106-7, 33.3x3.63 (screw thread insert)
@   1.1/8-7 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1.1/8(-7) BSW     British Standard Whitworth, 55°; also "continental Whitworth"; 1.1/8W7 (former JIS B 0210); BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 t  1.1/8-7 BSW       some woodturning lathe chucks; Morton
H   1.1/8-7           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   1.1/8-7           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1.1/8(-7) UNC     M28.575x3.629, primary size, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957, H28 1963), JIS B 0210, BS 1580:1962
    1.1/8-7 UNC       on crane hooks; minimum size for #8 hook/crane, workload limit 5.00 tons (Crosby/Bullard)
L   1.1/8-5 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard US size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C
@   1.1/8-4.5         wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 28mm
L   1.1/8-4 ACME      leadscrew, BS 1104:1957, class 2G/3G/4G/5G
L   1.1/8-3.5 square  standard square-thread taps (Machinists Handbook 1909)
W   1.1/8-3.25        lag screws
@g  W28.574-14        "1.1/8"; gas bottle neck thread, tapered 1:8, on smaller dia; IS3224 type 4 size 2, 14 turns oversize; also BS 341
====W28.8-14 keg      Whitworth gas cylinder thread, W28.8x1.814 tapered 3:25; 25E (EN ISO 11363-1/EN 629-1), E25 con, 25T (BS 341-1991), 28.8mm (DIN 477-1), SI no. 2b
 g  W28.8-14          "25E", "E25 con"; gas bottle neck thread, DIN 477, IS3224 type 2 size 2, SI no. 2b, also CGA V-1; tapered 3:25; 10-50 liter cylinders; see also W19.8-14, W31.3-14
 g  W28.81-14         gas bottle neck thread, NEN 3268 RU 6 (Netherlands), male on bottle; oxidizer - air; 25E; ISO, tapered 3:25, female in cylinder, common for medical gases; also 27.8-14, 25.8-14
    1.9/64-24         vintage Harley Davidson motorcycles; chassis, fork stem, 1930-36 "BT"
@   M29x0.35          DIN 13-2
@   M29x0.5           DIN 13-3
 o  M29x0.5           lens mount, Arcturus binoviewer, Componon lenses, LWIR thermal cam lenses; Rodenstock 50mm f/2 Retina Heligon C Kodak Retina IIc, IIIc; Schneider&Kreuznach 50mm f/2 Retina-Xenon Kodak Retina IIa; Agfa 50mm f/2 Solagon KARAT IV
 o  M29x0.5           optical filter; on Rodenstock 50mm f/2 Retina Heligon C Kodak Retina IIc, IIIc; Schneider&Kreuznach 50mm f/2 Retina-Xenon Kodak Retina IIa; Agfa 50mm f/2 Solagon KARAT IV
@   M29x0.75          DIN 13-4
 o  M29x0.75          optical tubes, common[ref]
*   W29-14            ...see W28.8-14
@   M29x1             DIN 13-5
 o  M29x1             lens mount; common on laser optics, eg. beam expanders; also M16x0.75, M22x0.75
 C  M29x1             common thread on "aviation connectors" with sleeve nuts, eg. GX30, large ones
====M29x1.5           DIN 13-6
 C  M29x1.5           HN connectors, "business end" securing threads on "7/16 DIN" coaxial RF connectors
    M29x1.5           backnut for kitchen/bathroom faucets, shower handset holders with hose pullout (also M34x1.5, M27x1.5)
    M29x1.5           pinion nut on some Mercedes vehicles
@   M29x2
 C  M29x2             RM24 connector, "business end" sleeve nut
@   M29x2.5
@   M29x3
 p  Tr29              on packaging tubes; uncommon
s   29x5              M20 threaded insert, DIN 7965; 60°, lesser dia 24mm
 p  29x6.33x3         29/25, GME 30.26, DIN EN 16592, 29/25-12.6-3/6.5; plastic bottle thread; low or high 3-start 180°; more common in some regions than 30/25 due to less material; see also 30/25
 p  28.3-7            GME 30.27, EN 16593, 28.3/22.5-59.5-1/3.6; plastic bottle thread
@   1.155(-20)        BS copper pipe thread, BScopper, 1" inner dia; W29.34x1.27
@   M29.5x0.5         DIN 13-3
 o  M29.5x0.5         lens mount, "O-mount", unusual; in machine vision; JIIA image size class II
 o  M29.5x0.5         lens mount, Schneider-Kreuznach M-Componon, uncommon
 o  M29.5x0.5         on astronomy 31.0mm eyepieces (Lichtenknecker)
 o  M29.5x0.5         lens mount; on anamorphic attachments like KOWA Prominar 8/2x, male on atachment
@g  W29.5-14          "V2", "V3"; gas bottle neck thread, 55°, tapered 3:26, on larger dia; JIS 8246, SI no. 4b an 4c
@   1.1624-8          STI-1-8, 29.5x3.18; screw thread insert thread, ASME B18.29.1
 h  1.174-20          antique geodetic/surveying gear, pre-standard, male on tripod
====1.173-18 UNS      ABMA #6 locknut, N-06, M29.79x1.41, 1.11/64-18
 w  1.180-24          firearm silencer mounts, male on mount, eg. MMW Reflex, SDTA
 w  1.18-14 NS-2      US artillery fuze, MK27, point detonation, for 40mm gun HE ammo
@   M30x0.35          DIN 13-2
@   M30x0.5           DIN 13-3, DIN 519 (1st)
 o  M30x0.5           lens mount, Schneider-Kreuznach Spezial-Anastigmat, Cassar, uncommon
 o  M30x0.5           lens mount, optical block of LOMO OKC1-40-1 lens, Carl-Zeiss Mikrotar, Tessar
 o  M30x0.5           lens mount; on Kowa 8, Baby Kowa 2x anamorphic adapter
 o  M30x0.5           lens mount, on some Schneider-Kreuznach photo enlarger lenses
@o  1.1811-36 NS      30.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
====M30x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M30x0.75          microscope objective, Wollensak Graphic Raptar, apparently less common
 o  M30x0.75          lens mount, some CCTV lenses, some thermal imaging lenses
 o  M30x0.75          optical filter thread, on eg. all Canon SD 7xx and some other Canon SD models, Sony DCR-TRV11 or DCR-TVR27 videocam, Mir-47 MS (or 0.5mm pitch?)
====M30x1             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, DIN 13-5, SI M.MD, ISA D (1940), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
 o  M30x1             lens mount, rare; some thermal imaging lenses, SWIR/MWIR lenses
 o  M30x1             lens mount; laser optics, eg. beam expanders
 t  M30x1.0           ERM25 mini collet nut
    M30x1             heating radiator valve thread, outside for thermostatic heat attachment; Oventrop
    M30x1             on bicycles, sprockets; freewheel BMX, small
@   M30x1.25
=== M30x1.5           common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 g  W30x1.75          gas bottle valve thread, AFNOR NF B (France), male on bottle; oxidizer - industrial air
 %  M30x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M30x1.5           metric pipe thread DIN 7631
 %  M30x1.5           tube coupling, French GAZ 24-deg seat, 21.25mm tube
 %  M30x1.5           tube coupling, French millimetric 24-deg seat, 22mm tube
 %  M30x1.5           tube coupling, Komatsu equipment "-12", 30-deg cone (male cone on male)
 %  M30x1.5           tube coupling, 22mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M30x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; DIN "L", 22mm tube tube
 %  M30x1.5           tube coupling, Chinese, O-ring face seal (JB1887), 19mm tube
 %  M30x1.5           compression fitting, 22mm tube: metric Norgren/Enots, metric WADE
 %  M30x1.5           on oil filters; lube; rare
    M30x1.5           heating radiator valve thread, outside for thermostatic head attachment; common; on thermostatic valves HERZ (or M28x1.5?), Bosch
 %  M30x1.5           cable gland, PG24    cable 15..22  36      // G1
    M30x1.5           compressor oil sight
 t  M30x1.5           chuck MK2 for collets ER32
 t  M30x1.5           some woodturning lathe chucks
 t  M30x1.5           bearing retaining locknut, "KM6", ISO 2982 (1971)
 t  M30x1.5           on some adjustable reamers (Beck)
    M30x1.5           threaded-body industrial proximity sensors, eg. induction or photoelectric
 g  M30x1.5           fire extinguishers, water/foam/powder; female on bottle, most common
 g  M30x1.5           gas bottle valve thread, DIN 477 No.52 (Germany, most Europe), female on bottle; nonflammable, nontoxic, 300 bar
 g  M30x1.75          gas bottle valve thread, ITC EP6 TIPO B (Spain), male on bottle; nonflammable - air
 g  W30-14            gas bottle valve thread, UNI 4407 (Italy), male on bottle; toxic - ammonia
 g  W30-14            gas bottle valve thread, UNI 4410 (Italy), male on bottle; nonflammable - air
 g  W30x2             gas bottle valve thread, AFNOR NF M (France), male on bottle; oxidizer - inert + oxygen over 21% + CO2 under 7%
 g  W30x2             gas bottle valve thread, valve output, 300-bar; right-thread nonflammable, LH-thread flammable
 g  W30x2             gas bottle valve thread, DIN 477 No.54,55,56,59,60,0170 (Germany, most Europe), male on bottle(?); nonflammable
 g  W30x2 LH          gas bottle valve thread, DIN 477 No.57,58 (Germany, most Europe), male on bottle(?); flammable
=== M30x2             common; ISO 261 1st, ISO primary fine (coarse), ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st fine, JIS B 0211, MJ, electrical conduit DIN 89280, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M30x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 g  M30x2             gas bottle neck thread, parallel; EN ISO 15245, BS 341-1, IS 3224:2014, SI no. 6; see also M18x1.5, M25x2
 %  M30x2.0           metric pipe thread DIN 7631?
 %  M30x2             tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 22mm tube (light),  20mm tube (heavy)
 %  M30x2             tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 22mm tube; Russian heavy, 20mm tube; DIN "S", 20mm tube
 %  M30x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 22mm tube; type J (39.2 MPa), 20mm tube
 %  M30x2             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 20mm tube
 %  M30x2             on oil filters; lube; unusual
    M30x2.0           pneumatic cylinder, MAL 40mm
    M30x2             boat propeller nut, on 45mm-dia shafts
    M30x2             stud bolt size, fine; ISO 898-1
    M30x2             thread insert, external thread; keylocking heavy duty, M20x1.5, M20x2.5
H   W30x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
====M30x2.5           ISO extended
 t  M30x2.5           some woodturning lathe chucks
H   W30x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W30x1/10"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   30x3.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
H   28x3              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
=== M30x3             ISO 261 1st, ISO primary fine (coarse) (avoid this pitch if not necessary), BS 3643-1:1981 1st constant (avoid), JIS B 0211, DIN 13-8, DIN 246 (1st), GOST 9150-59 constant, GOST 24705-81
@   S30x3             buttress thread, fine, 33°, DIN 514
 p  KS30(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg; secondary size
 p  KT30(x3)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
L   Tr30x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   30x3.125          Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   Rd30(-8)          round/knuckle thread, DIN 405
H   30.0x3.4          Armengaud thread, V-thread, 76° (later 55°), historical
H   30x3.5            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   30x3.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   30x3.5            S.F. No.5, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   M30x3.5           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M30(x3.5)         M30, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, DIN coarse, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M30x3.5           car wheel hubs, Cat 797 wheel hub BH
    M30               stud bolt size, ISO 898-1, EN 1993-1-8
    M30x3.5           high-strength injection structural bolts, DIN 6914
    M30               outside thread on German treehouse screw (GTS); for heavy limb Treehouse Attachment Bolt (TAB) see 1.3/4-12; for standard TAB, short TAB, mini TAB see 1.1/4-12
    M30               some tunnel concrete connection bolts
 t  M30x3.5           some woodturning lathe chucks; NOVA TL1500/3000/Comet (European and Southern Hemisphere), Woodfast
H   30x3.6 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh30x3.6          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
 p  30-7              glass bottle, roll-on finish compatible with Stel capsules, for wine and liquors
 p  30x4              German bottle closure thread series; depth 1.36mm, crest radius 1.10mm, root radius 0.80mm
 p  30-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 28.3mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  30-6              glass bottle, top-and-side roll-on champaigne finish; 28-1660
 p  SP30(-6)          30SP, glass/plastic bottle thread, SP-400,430; 30-400, 30-430; uncommon
@   S30x6             buttress thread, coarse, 33°, DIN 513
L   Tr30x6            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
 p  30x9x3            30/25; GME 30.21, EN 16064, 30/25-18.5-3/9 (long), GME 30.22, EN 16065, 30/25-16.8-3/9 (short); plastic bottle thread; low or high 3-start 120°; short (16.8mm), long (18.5mm); juice, RTD tea, energy drinks, water; see also 29/25
 p  30-1x3            glass lug vacuum-seal bottle, 3-start; 30-2080, medium-deep finish; FD 169, WGF-169S (medium); FD 145D, WGF-145D (deep)
@   1.3/16-32
====1.3/16-28 UN      28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.3/16-27
@   1.3/16-26 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   1.3/16-24
    1.3/16-24         Maglite flashlight tubes, B-size, internal (tailcap)
@   1.3/16-20 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
====1.3/16-20 UN      20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
    1.3/16-20 UN      connectors, eg. circular Mega-Con-X Switchcraft connectors; panel nuts
=== 1.3/16-18 UNEF    M30.1625x1.411, secondary size, ANEF (H28 1944), NEF (H28 1950/1957), UNEF 2nd (H28 1963), aeronautical (H28 1944)
 %  1.188-18 UNEF     conduit-to-panel fittings, MIL-PRF-24758-5, size C
    1.1875-18 UNEF    circular connectors, MIL-DTL-5015; size 20, accessory (H) (1.25-18 UNEF for coupling)
 C  1.188-18 UNEF     circular connectors, MIL-DTL-83723; size 18, coupling ("business end"); size 20, shell/accessory
    1.1875-18 UNEF    circular connectors, MIL-DTL-38999; series I size 17 accessory; size 21 shell/accessory, code G, coupling is 1.375-10x3
====1.3/16-16 UN      16UN, 16-thread, secondary size, constant pitch series, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN (H28 1957, H28 1963 (2nd)); originally for adjusting collars, retaining nuts
 w  1.3/16-16         (M30.16x1.59)  firearm rifle barrel/receiver thread; AR15/M16 receiver extension (recoil buffer) tube and lower receiver threads
 w  1.3/16-16         firearm barrel buffer tube thread
@   1.3/16-14 UNS
H   1.3/16(-12) ADMF  Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 30.163x2.117; less common?
@   1.3/16-12         taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====1.3/16-12 UN      12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957, H28 1963 (2nd)), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  1.3/16-12 UN      tube coupling, 7/8 ("-14"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  1.3/16-12         tube coupling, 7/8 ("-14"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  1.3/16-12 UN      tube coupling, 3/4 ("-12"), O-ring face seal (ORFS, SAE J1453)
 %  1.3/16-12         tube coupling, 7/8 ("-14"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  1.3/16-12         JIC tube fittings, for 7/8 tube
 %  1.3/16-12 UN      ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514; AS5202 (for UNJ)
 h  1.187-10          antique geodetic/surveying gear, pre-standard, female on tripod; Keuffel & Esser - spring loaded three screw leveling tripod head
@   1.3/16-10
 C  1.1875-10x3       circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 17, coupling ("business end")
====1.3/16-8 UN       8UN, 8-thread, secondary size; constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   1.3/16-7          USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909)
    R7/8-20           compression fitting, 5/8" tube: imperial Norgren/Enots
@   7/8-14 TWPP       Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G7/8(-14)         G30.201x1.814, W1.189-14, W30.2x1.814, G7/8; BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel); Whitworth pipe thread (Machinist Handbook 1909); also somewhere specified as W28.6-14 (tapered?); Original Whitworth Pipe Thread (Guide to World Screw Threads); not used for British Standard Taper Pipe but in BS 2779 (Fastening Threads of BSP sizes)
 %  G7/8-14           fire extinguishers, water/foam/powder, 2-12 kg; female on bottle
 %  G7/8              smaller sink drains
 w  7/8-14 BSPT       fuze well on old (1890's) British artillery shells

 o  M30.3x0.8         lens mount, ENVIS (1.2"-32) astro
@   PZ30.3(-14)       gas bottle neck thread; tapered, Whitworth; PZ39.0, PZ30.3, PZ27.8, PZ19.2; GB 8335:2011 (China)
@   M30.5x0.5         DIN 13-3, Thorlabs SM30
 o  M30.5x0.5         lens mount, Thorlabs SM30; common on Thorlabs microscope condensers
 o  M30.5x0.5         optical filter, outer dia usual 32.5   aperture usual 25.5, on some C/CS-mount lenses; relatively unusual; some industrial telecentric lenses
 o  M30.5x0.5         very common in machine vision
@   30.897x3          STI-M27x3, screw thread insert thread, DIN 8140-2
@   M31x0.35          DIN 13-2
@   M31x0.5           DIN 13-3
@o  1.2205-36 NS      31.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M31x0.75          DIN 13-4
 o  M31x0.75          some lens mounting rings
 o  M31x0.75          lens mount, some thermal imaging lenses
@   M31x1             DIN 13-5
 o  M31x1             some lens mounting rings, eg. in laser optics
    M31x1             circular connectors, MIL-DTL-38999; size 21 shell/accessory, code G, coupling is 1.375-10x3
@   M31x1.5           DIN 13-6
H   31x3.930          FS -13, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -13, 1.2048-6.5
 p  31-6              glass bottle thread, British, BS 1918:1953; R-4 finish; round 60°, main dia 30.3mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
====W31.3-14 keg      Whitworth gas cylinder thread, W31.3x1.814, tapered 3:25; 28E (EN ISO 11363), DIN 477-1, SI no. 2c
 g  W31.3-14          "28E"; gas bottle neck thread, DIN 477, tapered 3:25, SI no. 2c; for acetylene; see also W19.8-14, W28.8-14
@   1.2333-12         STI-1.1/8-12, 31.3x2.12; screw thread insert thread, ASME B18.29.1
@   M31.5x0.5         DIN 13-3
 o  M31.5x0.5         some lens mounting rings, eg. Thorlabs
 p  31.5-7            glass bottle, roll-on finish compatible with Stel capsules, for wine and liquors
*   1.1/4" copper     ...see 1.405-20, W35.69x1.27
*   1.1/4" NPT        ...see M42.16x2.209
*   1.1/4" BSP        ...see G1.1/4, W 1.21/32-11 W42.07x2.31
*   1.1/4 JIC         ...see 1.5/8-12; fittings/tubes, dash size -20, nominal inner dia 1.25"
===== 1.1/4" Cu tube  DN32, 31.75mm outer-diameter tube; AS 1432 wall thick 1.63mm/16g (A/green, 3.75 MPa), 1.22mm/18g (B/blue, 2.78MPa), 0.91mm/20g (D/black, 2.04 MPa); AS/NZS 1571, wall thick 0.91mm (2.17 MPa), 1.22mm (2.93 MPa), 2.03mm (5.00 MPa)
@   1.1/4-40
@   1.1/4-36
@   1.1/4-32 UNS
 o  1.1/4-32 UNS      lens mount, US standard series, male on lens, PH3.10
====1.1/4-28 UN       28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
 S  1.25-28 UN-2A     M31.75x0.907, convention for microphone capsules; usual thread for grilles for most ball-shaped dynamic microphones, female on grille, male on microphone; eg. SM58, PG48, PG58
@   1.1/4-27
@   1.1/4(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
@   1.1/4-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
    1-1/4-26          on bicycles; thread headset, 1-1/4 inch standard
@   1.1/4-26
 o  1.25-24 Whitw.    British camera lens flange fittings, R.P.S. standard
@   1.1/4-24 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
    1.1/4-24          on bicycles, steerer tube MTB
====1.1/4-20 UN       20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
@   1.1/4-20 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
*   1.1/4-20 copper   ...see 1.405-20, W35.69x1.27
*   1.1/4-18 UNO      ...see M33x1.5
@   ET1.1/4(-18)      W1.1/4-16, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
=== 1.1/4(-18) UNEF   M31.75x1.411, primary size; SAE extra fine (1915/1926), ANEF (H28 1944), NEF (H28 1950/1957), UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
 w  1.1/4-18          firearm rifle barrel/receiver thread; AR15/M16 upper receivers and barrel nuts
 %  1.1/4-18          JIC tube fittings
 %  1.250-18 UNEF     conduit fittings, MIL-PRF-24758-2, size D
    1.1/4-18          panel nuts
 C  1.1/4-18          circular connectors, MIL-DTL-5015; size 22, fitting; size 22, coupling (Conxall)
 C  1.25-18 UNEF      circular connectors, MIL-DTL-5015; size 20, coupling (J) (1.1875-18 UNEF for accessory)
    1.250-18 UNEF     circular connectors, MIL-DTL-83723; size 18, mounting nut
    1.250-18 UNEF     circular connectors, MIL-DTL-38999; series I size 17 panel nut, series II size 15 panel nut
    1.1/4-18 UNEF     swivel nuts of some glass industrial thermometers, standard
 h  1.250-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
 h  1.250-18          antique geodetic/surveying gear, pre-standard, female on tripod; Buff & Buff
 o  W1.1/4-16         on many historical 19th century British astronomic telescopes, approximate; eyepieces and accessories
====1.1/4-16 UN       16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957, H28 1963); originally for adjusting collars, retaining nuts
    1.1/4-16          panel nuts
    1.1/4-16          small aircraft axle nuts, hex castle nuts, for 500x5 axles; see also 1.1/4-12, 1.1/2-16, 1.1/2-12
    1.1/4-16 ACME     for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   1.25-16 BUTT      buttress thread, 7/45°, ANSI B1.9
@   1.1/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
*   1.1/4-12 STI      ...see 1.3583-12, 34.5x2.12 (screw thread insert)
H   1.1/4(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 31.75x2.117
@   1.1/4-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.1/4(-12) UNF    M31.75x2.117, primary size, 12UN, SAE regular, 12AN, ANF (NSTC 1921/1924), ANF/AN (NSTC 1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF/N (B1.1-1935), UNF (H28 1950/1957), UNF/UN (H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
c   1.1/4-12 UN       UNF standard; 12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
    AN20              aircraft bolts, 1.1/4-12 UNF-3A
 %  1.1/4-12          tube coupling, 7/8" tube, standard flare fitting
 %  1.1/4-12 UNF      tube coupling, 7/8 ("-14"), SAE 45-deg flare (SAE J512), flare male on male
 %  1.1/4-12 UNF      "D fitting", "D" nut, "size D" welding hoses; H28 1942/1944 ("Class D")
 %  1.1/4-12          on oil filters; lube, hydraulic, transmission; unusual
 %  1.250-12 UN       shipboard stuffing tube, ASTM F1836, US, size C,D
    1.1/4-12          small aircraft axle nuts, round castle nuts, for 500x5 axles; see also 1.1/4-16, 1.1/2-16, 1.1/2-12
    1.1/4-12          outside thread on treehouse attachment bolts (TAB); standard TAB, short TAB, mini TAB; for heavy limb TAB see 1.3/4-12; for German treehouse screw (GTS) see M30
 t  1.1/4-12          some milling machine arbor nuts
 t  1.1/4-12          some woodturning/metal lathe chucks; Dalton
    1.1/4-12          thread insert, external thread; keylocking heavy duty, 7/8-14, 7/8-9; extra heavy duty, 3/4-16, 3/4-10
@   1.25-12 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1.1/4-11.5 NPT    ...see M42.16x2.209
*   1.1/4-11 BSP      ...see G1.1/4, W 1.21/32-11 W42.07x2.31
 %  1.1/4-11          tube coupling, JIS 300, 1.1/4 ("-20"), tapered, or 30-deg male flare on male
    1.1/4-11          antenna mount, for bigger (eg. marine) antennas
@   1.1/4-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  1.250-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 19, coupling ("business end")
@   1.25-10 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   1.1/4-9 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   1.1/4(-9) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
====1.1/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950/1957), UN (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 t  1.1/4-8           some woodturning lathe chucks; NOVA Galaxi, NOVA Saturn, NOVA DVR 3000, NOVA XP, NOVA 1624 and 1624 II (North America), Laguna Revo
@   1.25-8 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1.1/4-7 STI       ...see 1.4356-7, 36.5x3.63 (screw thread insert)
H   1.1/4-7           Whitworth thread proposal, 1841; as 1.250-7, 1857
@   1.1/4-7 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1.1/4(-7) BSW     British Standard Whitworth, 55°; also "continental Whitworth"; 1.1/4W7 (former JIS B 0210); BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   1.1/4-7           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   1.1/4-7           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1.1/4(-7) UNC     M31.75x3.629, primary size, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957/1963), JIS B 0210, BS 1580:1962
    1.1/4-7 UNC       on crane hooks; minimum size for #9 hook/crane, workload limit 6.53 tons (Crosby/Bullard)
    1.1/4-7           thread insert, external thread; EZ-Lok steel, 7/8-9
@   1.25-6 BUTT       buttress thread, 7/45°, ANSI B1.9
L   1.1/4-5 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard US size (H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C
 g  1.1/4-5 ACME      LPG/propane/butane connection, on forklifts, portable cylinders; G.29 (RH), G.30 (LH)
@   1.1/4-5           wooden thread (US tools - Bealltool), 60-deg V-thread
L   1.1/4-4 ACME      leadscrew, Acme trapezoidal thread, angle 29-deg; BS 1104:1957, class 2G/3G/4G/5G
@   1.1/4-4           wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 32mm
    1.1/4-4           wooden thread, encountered on threaded rod of a vise bench, 90°, Lake Erie Toolworks Moxon Vise Lite
W   1.1/4-3.25        lag screws
@g  W31.75-11         "32T"; gas bottle neck thread, tapered 1:8, on smaller dia; 1.250-11; IS3224 type 4 size 3; also BS 341
 g  W31.75-7          gas bottle neck thread, ITC EP6 TIPO T (Spain), male on bottle; toxic or corrosive - chlorine drum tanks
 o  M31.8x0.75        riflescope objective lens thread, mostly 1-4x24 first focal plane scopes
@   31.80-16          CTC 31-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
@   M32x0.35          DIN 13-2
@   M32x0.5           DIN 13-3, DIN 519 (3st)
 o  M32x0.5           lens mount, Carl-Zeiss S-Planar, uncommon
 o  M32x0.5           optical filter; on Watershot Underwater Housing for Samsung Galaxy S3, many of the older Kern Switar lenses
====M32x0.75          DIN 13-4
 o  M32x0.75          optical filter; on Watershot Underwater Housing for Apple iPhone
 o  M32x0.75          lens mount, microscope objective size O6, Bell&Howell Eymax, Leica PL APO (rear part protruding beyond of the thread cylinder); some thermal imaging lenses
 o  M32x0.75          some lens mounting rings
    M32x0.75          panel nut on RM31 panel connector
====M32x1             DIN 13-5, SI M.MD, ISA D (1940)
 o  M32x1             lens mount, Cooke copying lens, Rank-Taylor-Hobson Butar, Vickers Macro Lens, uncommon; some thermal imaging lenses, some SWIR/MWIR lenses
    M32x1             circular connectors, MIL-DTL-38999; series III,IV size 17 panel nut
    M32x1             heating radiator valve thread, outside for thermostatic heat attachment; Ista brand
@   M32x1.25
====M32x1.5           ISO 261 3rd, ISO tertiary fine, electrical conduit EN 60423, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M32x1.5           "E32", "M32C", electrical conduit
 %  M32x1.5           some tubing/piping systems (also M40x1.5)
 %  M32x1.5           on oil filters; lube; rare
    M32x1.5           bearing retaining locknut, "KM64", ISO 2982 (1971)
 t  M32x1.5           ER25 collet nut
    M32x1.5           Amphenol, AHDM size 18 connectors, backshell
====M32x2             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M32x2             on oil filters; hydraulic; rare
    M32x2             thread insert, external thread; keylocking heavy duty, M22x1.5
H   W32x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   M32x2.5
 %  M32x2.5           some compression hydraulic fittings, steel, 35mm tube
H   32x3.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
====M32x3             "4th choice/avoid", DIN 13-8, DIN 246
    M32x3             standard reinforced concrete rebar couplers
@   S32x3             buttress thread, fine, 33°, DIN 514
 p  KS32(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg
 p  KT32(x3)          for plastic containers, trapezoidal thread DIN 6063-2
 p  GPI33(x3)         31.8x3, Glass Packaging Institute (North American); plastic/buttress?; see also GPI38
L   Tr32x3            trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd32(-8)          round/knuckle thread, DIN 405
H   32x3.5            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   32x3.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M32x3.5           "French metric" (Machinists Handbook 1909)
H   32x3.571          Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   32x3.6 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh32x3.6          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
@   Rd32(x4)          round/knuckle thread, DIN 20400
 p  32x4              German bottle closure thread series; depth 1.36mm, crest radius 1.10mm, root radius 0.80mm
 p  GL32(x4)          on glass containers, knuckle thread DIN 168-1; 60° internal, 30° external; common on lab glassware, media bottles (glass Duran), tubes 6..20mm, aperture 20mm, wrench 32mm; on 28mm glass tubes
 p  DIN32             plastic variant of GL32, S32
@   DN32(-6)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
@   S32x6             buttress thread, coarse, 33°, DIN 513
L   Tr32x6            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
    32.2-32           on bicycles; bottom bracket cones, Fauber-type bottom bracket
 h  1.275-16          antique geodetic/surveying gear, pre-standard, male on tripod; Herman Pfister of Cincinnati for wye level
@   M32.5x0.5         DIN 13-3
 o  M32.5x0.5         lens mount, some objectives
 o  M32.5x0.5         lens mount, on size #0 Schneider-Kreuznach photo enlarger lenses
 o  M32.5x0.5         some lens mounting rings, eg. Thorlabs
@o  1.2795-36 NS      32.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 o  M32.5x0.75        lens mount?, inner thread on 35mm-dia C35 optical tubes
 o  M32.5x0.75        optical filter, unusual
@   1.290-24 BSC      British Standard Cycle, bicycles, 60°; lock rings for sprockets on gear hubs; LH/left
@   BC 1.29-24        BC1.29, 32.77x1.058, bicycle thread, general use, nut for rear hub shaft suspension; JIS B 0225
@   Fg32.8(-24)       32.766x1.058, bicycle screw thread, 60°, DIN 79012
    FG32.8 LH         on bicycles, sprockets; lock ring BSA/ISO, most common, rigid pinion
====1-11.5NPSH        1.295-11.5, 1" NPSH, 32.89x2.209, firehose/hydrant coupling thread, NPSH/IPT 1"; NSTC 1921/1924/1928/1933, H28 1942/1944 (American National Hose Coupling), ANSI/ASME B1.20.7
 %  1-11.5NPSH        firefighting, booster hose, 1" hoses (NFPA)
 %  1-11.5NPSH        firefighting, forestry hose, 1" hose (USDA 5100-107d specification)
@   M33x0.35          DIN 13-2
@   M33x0.5           DIN 13-3, DIN 519 (2st)
 o  M33x0.5           lens mount, Carl-Zeiss Apo-Tessar, Apo-Germinar, Tessar uncommon
====M33x0.75          ISO extended, DIN 13-4, GOST 9150-59 constant, GOST 24705-81
 o  M33x0.75          lens mount, LOMO Microplanar 4.5/65mm lenses, microscopes
 o  M33x0.75          optical filter; on some Kiev-16U lenses (some have M35.5x0.5), Industar-50
 o  M33x0.75          some lens mounting rings
====M33x1             ISO extended, SI M.MD, ISA D (1940), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
    M33x1             triple clamp on many Honda motorbikes
    M33x1.25          on some Ducati motorbikes
=== M33x1.5           ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M33x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M33x1.5           tube coupling, French millimetric 24-deg seat, 25mm tube
 %  M33x1.5           tube coupling, Komatsu equipment "-16", 30-deg cone (male cone on male)
    M33x1.5           external thread on some shock absorbers
    M33x1.5           on Iveco Eurocargo gearbox
    M33x1.5           compressor oil sight
 t  M33x1.5           OZ16 collet nut
!S  M33x1.5           on lamps, lampshade thread, "M33", "1.28-18 UNO" (32.51x1.41), "UNO"; on UNO lampshades and lightbulb sockets, standard size, mounthole 1.7/16", 36..37mm; see also M28x2 (E14), M38x2.5, M40x2.5 (E27)
    M33x1.5           common backnut (bottom attachment) thread on kitchen/bathroom faucets
=== M33x2             common; ISO 261 2nd, ISO secondary fine (coarse), ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd fine, JIS B 0211, MJ, SI M.MB, ISA B (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M33x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M33x2             ISO 6149 hydraulic ports
 %  M33x2.0           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M33x2             tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M33x2             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M33x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 25mm tube; type J (39.2 MPa), 22mm tube
 %  M33x2             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 22mm tube
    M33x2             thread insert, external thread; keylocking heavy duty, M24x3
    M33x2             stud bolt size, fine; ISO 898-1
    M33x2             heating radiator valve thread, outside for thermostatic heat attachment; Rossweiner brand
 w  M33x2             ordnance fuze; UTI-M84 fuze for 128mm cal. missiles M63, M87, Plamen-D
H   W33x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   M33x2.5
H   W33x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W33x1/10"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M33x3             ISO 261 2nd, ISO secondary fine (coarse) (avoid this pitch if not necessary), BS 3643-1:1981 2nd constant (avoid), JIS B 0211, DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
H   33x3.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M33(x3.5)         M33, "2nd choice"; ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, SI M.MA, ISA A (1940), SI (1971), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
 t  M33x3.5           woodturning lathe headstock nut, spanner 50mm, also LH thread
 t  M33x3.5           some woodturning lathe collet chucks
    M33               stud bolt size, ISO 898-1, EN 1993-1-8
@   M33x4
 p  33-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 31.8mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
!p  SP33(-6)          33SP, glass/plastic bottle thread, SP-400,415,430,444,485; 33-400, 33-415, 33-444, 33-485; 400,430 on lab bottles, 400 also metal; 33-400 common on wider-mouth beverage bottles, pill bottles; 33-480 for food canning
 p  33-6              glass bottle, roll-on finish; 33-1620
@   E33               Edison thread (E thread DIN 40400), 32mm, 6tpi (4.23mm); used primarily for ceramic fuse holders above 35A
 p  GL33              ...see GL32, misnomer
 p  PCF-33P-1         33-4x2, PCF33, plastic bottle thread, two-start, 4tpi per start, 180° each; beverages, hot fill [ref]
 p  33-1x3            glass lug vacuum-seal bottle, 3-start; 33-2080, medium-deep finish, GME 20.00, ISO 9100-2, FD 169, WGF-169S
@   33.249-11         CTG 28-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
@   1-11 TWPP         Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G1(-11)           G33.249x2.309, W1.309-11 ~W 1.5/16-11, W33.249x2.31, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 %  1-11 BSPP         on hydraulic pipes with outer dia approx. 1.11/32"
 %  G1-11             fire extinguishers, water/foam/powder, 25-35 kg; female on bottle
 %  G1                larger garden hoses, UK/Europe
 %  G1                backnut for kitchen/bathroom faucets
 %  G1                on flareless tube fittings, for 25 mm tube
 %  M33.3x2.4         some compression hydraulic fittings, steel, 42mm tube
@   1.3106-7          STI-1.1/8-7, 33.3x3.63; screw thread insert thread, ASME B18.29.1
@   1.5/16-32
 o  1.5/16-32 UNS     lens mount, some thermal imaging lenses
====1.5/16-28 UN      28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.5/16-27
@   1.5/16-26 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   1.5/16-24
@   1.5/16-20 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
====1.5/16-20 UN      20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  1.5/16-20 NF      Swagelok fittings; series 1610, 1" tubes; 25mm tubes
====1.3125-18 UNS     ABMA #6.5 locknut, N-065, M33.32x1.41, 1.5/16-18
=== 1.5/16-18 UNEF    M33.3375x1.411, secondary size, ANEF (H28 1944), NEF (H28 1950/1957), UNEF 2nd (H28 1963), aeronautical (H28 1944)
    1.3125-18 UNEF    circular connectors, MIL-DTL-5015; size 22, accessory (H) (1.375-18 UNEF for coupling)
 C  1.313-18 UNEF     circular connectors, MIL-DTL-83723; size 20, coupling ("business end"); size 22, shell/accessory
    1.3125-18 UNEF    circular connectors, MIL-DTL-38999; series I size 19 accessory; size 23 shell/accessory, code H, coupling is 1.500-10x3
====1.5/16-16 UN      16UN, 16-thread, secondary size, constant pitch series, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN (H28 1957, H28 1963 (2nd)); originally for adjusting collars, retaining nuts
@   1.5/16-14
H   1.5/16(-12) ADMF  Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 33.338x2.117; less common?
@   1.5/16-12         taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====1.5/16-12 UN      12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957, H28 1963 (2nd)), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  16AN              1.5/16-12 fitting thread, usually with 37-deg flare
 %  1.5/16-12 UN      tube coupling, 1 ("-16"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  1.5/16-12         tube coupling, 1 ("-16"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  1.5/16-12         tube coupling, 1 ("-16"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  1.5/16-12         JIC tube fittings, for 1" tube
 %  1.5/16-12         on oil filters; hydraulic/transmission; unusual
 %  1.5/16-12 UN      ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514; AS5202 (for UNJ)
 %  1.313-12 UN       shipboard stuffing tube, ASTM F1836, US, size E
 h  1.312-12          antique geodetic/surveying gear, pre-standard, female on tripod; and with 3.795-12 male thread
@   1.5/16-10
====1.5/16-8 UN       8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   1.5/16-7          V.St'd (Machinists Handbook 1909)
@   1.5/16-6          USS (Machinists Handbook 1909)
 g  1.5/16-5 ACME     LPG/propane/butane connection, common in US ("small ACME"), male on bottle; OPD fitting
@o  1.3128-36 NS      33.346x0.706, retaining rings, PH3.17 "V", Photographic Filter Series, US standard
=====1" pipe          1.315 in, 33.401 mm outer diameter, DN 25, NPS 1/8, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 25mm, ASTM copper tube 28mm, NFPA 25/25.4mm, 25mm; ASTM B42 copper B43 red brass, wall th 0.126"/3.2mm standard, 0.182"/4.62mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
=== NPT 1(-11.5)      1.3082-11.5, ~1.5/16-11.5, M33.228x2.21; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; NGT(Cl)-1/2/3/4/5 oversized by 0/4/8.5/14/28 turns as per CGA V-1 for chlorine, Chlorine Institute P-17; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
    NPT1"-11.5        cable gland, NPT-1   cable 13..20,18..25   41
    1-11.5 NPT        liquid level sensors (also SAE), electrical feedthroughs, sight glass ports
 g  1-11.5 NGT        gas bottle neck thread, female on bottle, taper 1:16; IS3224 type 1 size 3, SI no. 1f, also CGA V-1
 g  1-11.5 NPT        gas bottle neck thread, fire extinguishers, CO2 bottles, female on bottle, less common than PZ27.8-14; tapered
 g  1-11.5 NPT        gas bottle neck thread, female on bottle; H28 1944 (acetylene (also 3/4-14 NPT), O2 (also 1/2-14 NPT, 3/4-14 NPT; pitch listed as 1-14 NPT, possibly typo); length 1")
@   M33.5x0.5         DIN 13-3
 o  M33.5x0.5         some lens mounting rings, eg. Thorlabs
@o  1.3189-36 NS      33.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
    1.32-24           on bicycles, sprockets; ITA lock ring
 o  1.325"-8          lens mount, 33.66x3.175, Bausch and Lomb Micro Tessar, uncommon
@   M34x0.35          DIN 13-2
@   M34x0.5           DIN 13-3, DIN 519 (3st)
 o  M34x0.5           lens mount, Agfa Repromaster 4.0/80mm, Agfa Repromaster 4.5/80mm, Staeble-magnogon R 5.6/105mm; some thermal cameras, back flange dist. 16.5/16.8mm
 o  M34x0.5           lens mount; on anamorphic VM lens
 o  M34x0.5           lens mount, thermal imagers, less common, back flange dist. 16.56/16.8/17.6(most common)/18.3mm
 o  M34x0.5           optical filter, outer dia usual 36     aperture usual 29
 o  M34x0.5           optical filter; on Angenieux 40mm Type S2, Angenieux 50mm Type S2
 o  M34x0.5           common in machine vision
 o  M34x0.7           lens mount, some objectives
@   M34x0.75          DIN 13-4
 o  M34x0.75          lens mount, Reichert Neu-Polar, Polar, uncommon
 o  M34x0.75          lens mount, some MWIR imagers, common with back flange dist. 13mm
 o  M34x0.75          lens mount, thermal imagers, very common, back flange dist. 13(most common)/13.3/20mm
 o  M34x0.75          optical filter, on some C/CS-mount lenses
====M34x1             DIN 13-5
 o  M34x1.0           lens mount, microscope objective, Zeiss and Nicon
 o  M34x1             lens mount; on Zeiss Ikon Steritar - a stereo attachment (beam splitter) allowing to take stereo picture pairs, male on atachment
    M34x1             circular connectors, MIL-PRF-64266, size 23, backshell/accessory; 1.500-10x2 for coupling
    M34x1             circular connectors, MIL-DTL-38999; size 23 shell/accessory, code H, coupling is 1.500-10x3
====M34x1.5           DIN 13-6, DIN 516
    M34x1.5           some oil tank caps on motorbikes (BMW)
    M34x1.5           on flareless tube fittings, for 25 mm tube
    M34x1.5           backnut for kitchen/bathroom faucets, valves (also M29x1.5)
 %  M34x1.5           seen on some metric heating radiator piping systems
====M34x2             DIN 13-7, DIN 247
    M34x2             bulkhead fittings
 g  M34x2             gas bottle neck thread, taper 5°
H   W34x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W34x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
====M34x3             DIN 13-8, DIN 246
    M34x3             couplers on some car engine water cooling circuits
 %  M34x3             firehose coupling, Italian, UNI 25
@   S34x3             buttress thread, fine, 33°, DIN 514
L   Tr34x3            trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd34(-8)          round/knuckle thread, DIN 405
H   34x3.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M34x3.5           "French metric" (Machinists Handbook 1909)
H   34x3.571          Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   S34x6             buttress thread, coarse, 33°, DIN 513
L   Tr34x6            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
@   M34.5x0.5         DIN 13-3
 o  M34.5x0.5         some lens mounting rings, eg. Thorlabs
 o  M34.5x0.5         optical filter; on lenses like old El-Nikkor 4/50mm
@o  1.3583-36 NS      34.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
@   1.3583-12         STI-1.1/4-12, 34.5x2.12; screw thread insert thread, ASME B18.29.1
@   34.546x3.5        STI-M30x3.5, screw thread insert thread, DIN 8140-2
    M34.7x1           on bicycles, French freewheels
H   1.37-24 CEI       Original Cycle, British bicycles, 60°, historical
@   BC 1.37-24        BC1.37, 34.80x1.058, bicycle thread, general use, rear hub, handbrake, small gear, hanger (LH,RH), freewheel; JIS B 0225
@   1.370-24 BSC      British Standard Cycle, bicycles, 60°; hub sprockets, bottom bracket cups; both RH and LH thread on opposing sides; most common worldwide, on Japanese/Taiwanese/Chinese and some Italian bikes
    1.37-24           on bicycles, sprockets; freewheel British/ISO, BSA; bottom brackets ISO/English/BSC, and threaded freewheel hubs, standard "English", interchangeable with 1.375-24 ISO if tolerances allow
====Fg34.8(-24)       34.798x1.058, bicycle screw thread, 60°, DIN 79012
    FG34.8            on bicycles, bottom bracket; 1.37"-24, bottom bracket cups, BSA/ISO, LH and RH; most common
*   1.3/8" BSPT       ...see W1.745-11, W44.323x2.309, G1.3/8, taper, high pressure copper
===== 1.1/4" Cu pipe  1.1/4" 31.75mm nominal bore, 1.3/8" 34.925mm outer diameter pipe; ASTM B88 type K/0.065"/1.65mm, L/0.055"/1.4mm, M/0.042"/1.07mm; ASTM 306 copper, 0.040"/1.02mm; plumbing copper pipe in USA/Canada
===== 1.3/8" Cu tube  31.75mm outer-diameter tube; AS/NZS 1571, wall thick 0.91mm (1.97 MPa), 1.22mm (2.66 MPa), 2.03mm (4.52 MPa)
 o  W1.3/8-28..36     on many historical 19th century British astronomic telescopes, approximate; sun caps
@   1.3/8-32
 o  1.3/8-32 UNS      lens mount, US standard series, male on lens, PH3.10
====1.3/8-28 UN       28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
@   1.3/8(-26) BSB    W34.925x0.977; British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances, secondary size?
@   1.3/8-27
H   1.3/8-26 CEI      Original Cycle, British bicycles, 60°, historical
@   1.3/8-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads); steering column
    1-3/8-26          on bicycles; bottom brackets, older "Raleigh" three speeds; LH+RH; generally Raleigh brackets wider than 70mm are 26 tpi, narrower 24 tpi
 o  1.375-24 Whitw.   British camera lens flange fittings, R.P.S. standard
@   1.3/8-24 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 o  1.375-24          astronomy, "ETX/NexStar/NX4 Thread"; on Meade ETX telescopes 90..125mm aperture, Celestron Nexstar 4SE telescope, on some Celestron C90 spotting scopes, some small Maksutov-Cassegrain telescopes
 w  1.3/8-24          firearms, many QD-mount end caps, Phantom QD silencer system
    1.375-24          on bicycles, bottom brackets, standard "ISO", interchangeable with 1.37-24 "English" if tolerances allow, often sold as "English"; also some Raleighs, see 1.3/8-26
====1.3/8-20 UN       20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
 %  1.3/8-20 UN       Swagelok fittings, 1" tubes
@   1.3/8-20 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
====1.376-18 UNS      ABMA #7 locknut, N-07, M34.95x1.41, 1.3/8-18
=== 1.3/8(-18) UNEF   M34.93x1.411, primary size; SAE extra fine (unlisted in 1915/1926?), ANEF (H28 1944), NEF (H28 1950/1957), UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
 %  1.3/8-18          JIC tube fittings
 %  1.5/16-18 UNJF    ports in scientific apparatus vessels; according to: AS5202, 6M152, AS1300, AS4201, PS10035
 C  1.3/8-18 UNEF     circular connectors, DE Group Series 16, size 22, "business-end" thread
 C  1.375-18 UNEF     circular connectors, MIL-DTL-5015; size 22, coupling (J) (1.3125-18 UNEF for accessory)
    1.375-18 UNEF     circular connectors, MIL-DTL-38999; series I size 19 panel nut, series II size 17 panel nut
    1.3/8-18          audio tech, tweeter speakers with 1" exit, standard size for professional audio speaker cabinets
    1.3/8-18          circular connectors, MIL-DTL-5015; size 24, fitting (Conxall)
 w  1.375-18 NEF-2A   1.3/8-18, on US mines; booster cavity on M21 antitank mine, with 0.75-18 for fuze well
====1.3/8-16 UN       16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957, H28 1963 (2nd)); originally for adjusting collars, retaining nuts
 %  1.3/8-16          on oil filters; lube; unusual
 h  1.375-16          antique geodetic/surveying gear, pre-standard, female on tripod; Keuffel & Esser, Used for Architects Wye Levels and Dumpy Levels
@   1.375-16 BUTT     buttress thread, 7/45°, ANSI B1.9
@   1.3/8-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  1.375-13          antique geodetic/surveying gear, pre-standard, male on tripod; C.L. Berger & Sons and Dietzgen (actual thread size is metric 35mm X 2mm)
*   1.3/8-12 STI      ...see 1.4833-12, 37.7x2.12 (screw thread insert)
H   1.3/8(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 34.925x2.117
@   1.3/8-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.3/8(-12) UNF    M34.93x2.117, primary size, 12UN, SAE regular, 12AN, AN (NSTC 1928), AN/ANF (NSTC 1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF/N (B1.1-1935), UNF (H28 1950/1957), UNF/UN (H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
c   1.3/8-12 UN       UNF standard; 12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
 %  1.3/8-12          tube coupling, 1" tube, standard flare fitting
 %  1.3/8-12 UN       tube coupling, 1 ("-16"), SAE 45-deg flare (SAE J512), flare male on male
 %  1.3/8-12          on oil filters; hydraulic/transmission; common-ish
    1.3/8-12          panel nuts
    1.3/8-12          thread insert, external thread; keylocking heavy duty and EZ-Lok steel, 1-14, 1-8
@   1.375-12 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1.3/8-11 BSPT     ...see W1.745-11, W44.323x2.309, G1.3/8, taper, high pressure copper
@   1.3/8-10          UNS (H28 1963), ASME B1.1-2003 Appendix D
 t  1.3/8-10          some woodturning/metal lathe chucks; South Bend Jr
 C  1.375-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 21, coupling ("business end")
@   1.375-10 BUTT     buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   1.3/8-8 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
@   1.3/8(-8) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956 (secondary size, avoid if possible); in British Standards Interim Report 7270-1919
=== 1.3/8-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), N/UNS (H28 1957), UN (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====3/4-8 NH          1.375-8, 1-8 NH, 0.75-8 NH, 34.93x3.175, firehose/hydrant coupling thread, NH/NST, for 3/4" and 1" hose; NSTC 1933, H28 1942/1944, ANSI/ASME B1.20.7, NFPA 1963
 %  1.375-8           hose coupling thread for 3/4" hose; USA, US STD Chemical Thread, "chemical hose thread", "booster hose thread"
 %  3/4-8 NH          firefighting, booster hose, 3/4" hoses (NFPA 1963 requirement)
====1-8 NH            1.375-8, 34.93x3.175; same as 3/4-8 NH; "chemical hose thread", "booster hose thread"; NSTC 1933
 %  1-8 NH            firefighting, booster hose, 3/4" hoses (NFPA 1963 requirement), 1" hoses (NFPA 1963 requirement, aka "chemical hose thread", "booster hose thread")
 %  1-8 NH            firefighting, on all nozzles for booster hose (NFPA 1963)
 %  1-8 NH            firefighting, forestry hose, 1" hose (NFPA 1963 requirement, a.k.a. Chemical Hose Thread)
@   1.375-8 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1.3/8-6 STI       ...see 1.5915-6, 40.4x4.23 (screw thread insert)
H   1.3/8-6           Whitworth thread proposal, 1841; as 1.375-6, 1857
====1.3/8(-6) BSW     British Whitworth Standard; W34.925x4.23; 55°; also "continental Whitworth"; 1.3/8W6 (former JIS B 0210); Whitworth 1841/1857; mentioned by Sellers (1864); old standard
H   1.3/8-6           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   1.3/8-6           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1.3/8(-6) UNC     M34.93x4.233, primary size, 6UN, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957, H28 1963), JIS B 0210, BS 1580:1962
    1.3/8-6           panel nuts
L   1.3/8-5 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg, NSTC 1933 (TODO:check)
@   1.3/8-4 taper     "1 3/8 pin", on porcelain high voltage insulators; taper 1:16 (0.75 in/ft); US standard as of 1920 (see also "One inch"); form varies as of 1912, semicircular or V-grooves [ref]
L   1.3/8-4 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
@   1.375-6 BUTT      buttress thread, 7/45°, ANSI B1.9
L   1.3/8-2x2 square  standard square-thread taps Lead D'BL (lead 1/2", Machinists Handbook 1909)
===== 35mm Cu tube    35mm outer-dia tube; ASTM B88M type A/1.6mm, B/1.4mm, C/1.1mm; EN 1057, wall th 1.0,1.2(X),1.5(Y)mm, also 1.0mm chrome-plated; BS 2871, table X (wall th 1.2mm, 4.2 MPa), Y (1.5mm, 4.1 MPa), Z (0.7mm, 3 MPa); copper pipe in Europe
@   M35x0.35          DIN 13-2
@   M35x0.5           DIN 13-3, DIN 519 (3st)
 o  M35x0.5           focusers on some astro telescopes, some lens mounts; on Starlight Xpress CCD cameras
 o  M35x0.5           lens mount, on some Schneider-Kreuznach photo enlarger lenses
 o  M35x0.6           eyepiece optical port, very rare?
@   M35x0.75          DIN 13-4
 o  M35x0.75          lens mount, Carl-Zeiss Luminar, uncommon
!o  M35x0.75          lens mount, TFL mount; 17.526mm flange distance equal to 1"-32 C-mount; "larger-diameter C-mount", proposed C-mount alternative for larger sensors, up to 4/3" or 22.5mm; "2nd choice"; machine vision standard JIIA LE-004 (Jul 2011); JIIA image size class III; see also M48x0.75, TFL-II
 o  M35x0.75          some lens mounting rings
 o  M35x0.75          optical filter, on Schneider projector lens, male on lens
 o  M35x0.75          optical filter; on modern (not vintage version) Meyer Optik Görlitz Primoplan 58mm f/1.9 lens
====M35x1             SI M.ME, ISA E (1940), DIN 13-5
 o  M35x1             lens mount, "M35", uncommon; some thermal imaging lenses
 o  M35x1             on astronomy telescopes, adaptor at focuser; Meade ETX 90/105/125, Celestron NexStar 4SE Maksutov
    M35x1             circular connectors, MIL-DTL-38999; series III,IV size 19 panel nut
    M35x1             on bicycles, sprockets; freewheel FRA/CH
    M35x1             on bicycles, bottom bracket; bottom bracket cups, standard "French", third most common; FR mfgers mostly use English spec now, but many legacy bikes out there
    M35x1             on bicycles, bottom bracket; bottom bracket cups, standard "Swiss" (LH+RH, LH thread on right side); also on old Motobecanes
    35-24             on bicycles, sprockets; 35x1.06 freewheel ITA
    M35-24            on bicycles, bottom bracket; M35x1.06, bottom bracket cups, misnomer for Italian M36-24?
====M35x1.5           common; ISO 261 3rd, ISO fine (for ball bearing locknuts), BS 3643-1:1981 3rd constant (locknuts), JIS B 0211, SI M.MD, ISA D (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
    M35x1.5           bearing retaining locknut, "KM7", ISO 2982 (1971)
====M35x2             SI M.MC, ISA C (1940), DIN 13-7, DIN 247
 C  M35x2             RM31 connector, "business end" sleeve nut
 h  35x2              antique geodetic/surveying gear, pre-standard, male on tripod; C.L. Berger & Sons and Dietzgen (actual thread size is metric 35mm X 2mm)
@   M35x2.5
H   35x3.5            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
====M35x3             SI M.MB, ISA B (1940), DIN 13-8, DIN 246
@   M35x3.5           "4th choice/avoid"
H   35.0x3.8          Armengaud thread, V-thread, 76° (later 55°), historical
H   35x4              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
 p  35x4              German bottle closure thread series; depth 1.36mm, crest radius 1.10mm, root radius 0.80mm
 p  SP35(-6)          35SP, glass/plastic bottle thread, SP-400,485; 35-400, 35-485; uncommon
H   35.2x4.370        FS -14, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -14, 1.3858-5.8
@   M35.5x0.5         DIN 13-3
 o  M35.5x0.5         some lens mounting rings, eg. Thorlabs
 o  M35.5x0.5         optical filter, outer dia usual 37.5   aperture usual 30.5
 o  M35.5x0.75        optical filter, standard size; on Helios-44-3M lens, Kiev-16U lenses (some have M33x0.5), some C/CS mount lenses, some industrial telecentric lenses
 o  M35.5x0.5         common in machine vision
@   1.405(-20)        BS copper pipe thread, BScopper, 1-1/4" inner dia; W35.69x1.27
    FG35.8            on bicycles, sprockets; freewheel ISO
    1.32-24           on bicycles, sprockets; ITA lock ring
@   M36x0.35          DIN 13-2
@   M36x0.5           DIN 13-3, DIN 519 (1st)
 o  M36x0.5           lens mount, Carl-Zeiss S-Planar, uncommon; some UV objectives
@   M36x0.75          DIN 13-4
 o  M36x0.75          lens mount, "I-mount", unusual; in machine vision; JIIA image size class III
 o  M36x0.75          lens mount, Leitz Wetzlar Summar, Photar, uncommon
 o  M36x0.75          optical filter, uncommon
====M36x1             ISO extended, DIN 13-5, SI M.ME, ISA E (1940), "metric special", GOST 9150-59 constant, GOST 24705-81
 o  M36x1             lens mount, some thermal imaging lenses, some SWIR/MWIR lenses
    M36-24            M24x1.058, on bicycles, bottom brackets; standard "Italian", second most common; Shimano bikes have this notch larger, may not fit; stripped "English"/"ISO" brackets can be rethreaded Italian
=== M36x1.5           ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M36x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 o  M36x1.5           optical filter, on some lenses, eg. laser beam expanders
 %  M36x1.5           tube coupling, French GAZ 24-deg seat, 26.75mm tube
 %  M36x1.5           tube coupling, French millimetric 24-deg seat, 28mm tube
 %  M36x1.5           tube coupling, Komatsu equipment "-20", 30-deg cone (male cone on male)
 %  M36x1.5           tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; DIN "L", 28mm tube tube
 %  M36x1.5           on oil filters; lube; rare-ish
 %  M36x1.5           cable gland, PG29    cable 18..25  38      // G5/4
    M36x1.5           compressor oil sight, oil drain plug
 %  M36x1.5           on hydraulic systems, compressed air systems
 %  M36x1.5           some fuel filters, often with 3/4-16 UNF on other side
    M36x1.5           bearing retaining locknut, shaft nut
=== M36x2             common; ISO 261 1st, ISO primary fine (coarse), MJ, electrical conduit DIN 89280, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M36x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M36x2.0           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M36x2             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M36x2             tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 28mm tube (light),  25mm tube (heavy)
 %  M36x2             tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 28mm tube; Russian heavy, 25mm tube; DIN "S", 25mm tube
 %  M36x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 28mm; type J (39.2 MPa), 25mm tube
 %  M36x2             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 25mm tube; O-ring face seal (JB1887), 22mm tube
 %  M36x2             some hydraulic fittings (M28x2, M36x2, M42x2, M48x3)
H   W36x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   M36x2.5
H   W36x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
=== M36x3             ISO 261 1st, ISO primary fine (coarse), ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
    M36x3             standard reinforced concrete rebar couplers
    M36x3             boat propeller nut, on 50mm-dia shafts
    M36x3             stud bolt size, fine; ISO 898-1
@   S36x3             buttress thread, fine, 33°, DIN 514
 p  KS36(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg; secondary size
 p  KT36(x3)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
L   Tr36x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   W36x1/8"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   36x4 VDI          VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh36x4.0          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   36x4              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   36x4              S.F. No.6, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   M36x4             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M36(x4)           M36, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO screws/bolts/nuts, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M36x4             thread insert, external thread; EZ-Lok steel, M20x2.5
    M36x4             car wheel hubs, Cat 797 wheel hub BH
    M36               stud bolt size, ISO 898-1, EN 1993-1-8
    M36x4             high-strength injection structural bolts, DIN 6914
@   Rd36(-8)          round/knuckle thread, DIN 405
@   Rd36(x5)          round/knuckle thread, DIN 20400
 p  GL36(x4)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
@   S36x6             buttress thread, coarse, 33°, DIN 513
L   Tr36x6            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 w  SpW36.18-10       ordnance fuze; Br-1 57mm honeycomb-launcher rocket warhead fuze UTI-1, UTI-2; 128mm rocket "Munja" warhead fuze; UTIU-M72B1 fuze for cal.85,100,122,130,152 HE grenades; UTIU-M85 fuze for cal.100,115,1
 w  Sp36.18-10        ordnance fuze; AF-61, M6 mortar fuze; AF-67 mortar fuze
 w  M36.18-10         ordnance fuze; UTI-M84P1 fuze for 107mm cal. M15 rocket
 o  M36.4x1           lens mount, Takahashi astro collimator?, "Vixen/Takahashi thread"
 o  M36.4x1           on astronomy telescopes, adaptor at focuser; Vixen/Lichtenknecker
@   M36.5x0.5         DIN 13-3
 o  M36.5x0.5         some lens mounting rings, eg. Thorlabs
@o  1.4370-36 NS      36.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   1.4356-7          STI-1.1/4-7, 36.5x3.63; screw thread insert thread, ASME B18.29.1
====1.7/16-28 UN      28UN, 28-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.7/16(-26) BSB   W36.5125x0.977; British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances, secondary size?
@   1.7/16-27
@   1.7/16-26 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   BC 1.7/16-24      BC1'7/16, 36.51x1.058, bicycle thread, general use, hanger; JIS B 0225
====1.7/16-20 UN      20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
    1.7/16-20         Maglite flashlight tubes, D-size, internal (tailcap)
@   1.7/16-20 BSC     British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
=== 1.7/16-18 UNEF    M36.5125x1.411, secondary size, ANEF (H28 1944), NEF (H28 1950/1957), UNEF 2nd (H28 1963), aeronautical (H28 1944)
    1.4375-18 UNEF    circular connectors, MIL-DTL-5015; size 24, accessory (H) (1.5-18 UNEF for coupling)
 C  1.438-18 UNEF     circular connectors, MIL-DTL-83723; size 22, coupling ("business end");size 24, shell/accessory
    1.4375-18 UNEF    circular connectors, MIL-DTL-38999; series I size 21 accessory; size 25 shell/accessory, code J, coupling is 1.625-10x3
 %  1.438-18 UNEF     conduit-to-panel fittings, MIL-PRF-24758-5, size D
====1.7/16-16 UN      16UN, 16-thread, secondary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN (H28 1957, H28 1963 (2nd)); originally for adjusting collars, retaining nuts
 h  1.437-16          antique geodetic/surveying gear, pre-standard, female on tripod; Keuffel & Esser, Used for Architects Wye Levels and Dumpy Levels
@   1.7/16-14
H   1.7/16(-12) ADMF  Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 36.513x2.117
@   1.7/16-12         taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====1.7/16-12 UN      12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935/1933), UN (H28 1950/1957, H28 1963 (2nd)), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  1.7/16-12 UN      tube coupling, 1 ("-16"), O-ring face seal (ORFS, SAE J1453)
 t  1.7/16-12(?)      some lathe chucks, unusual; Seneca Falls Star 9x5
====1.7/16-8 UN       8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.7/16-6 UN       6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.7/16-6          USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909)
@   1.450-26 BSC      British Standard Cycle, bicycles, 60°; tandem bottom bracket cups, LH+RH
    1.45-26           on bicycles, bottom bracket; 36.83x0.977, LH+RH, Chater Lea; old British spec, most often seen on tandems
@   BC 1.45-24        BC1.45, 36.83x1.058, bicycle thread, general use, hanger; JIS B 0225
@   M37x0.35          DIN 13-2
@   M37x0.5           DIN 13-3
====M37x0.75          DIN 13-4
 o  M37x0.75          lens mount, earliest T-thread, Tamron (backfocus 50.7mm), microscopes, some thermal imaging lenses
 o  M37x0.75          lens mount; on Moondog Labs 1.33x anamorphic attachment, MSN-500, male on atachment
!o  M37x0.75          optical filter, standard size; most common on consumer video cameras; on eg. Sony DSC-S30 camera, Jasper 4 MC lens
 o  M37x0.75          optical filter, outer dia usual 39     aperture usual 31.9
@   M37x1             DIN 13-5
 o  M37x1             lens mount, "M37"
    M37x1             circular connectors, MIL-DTL-38999; size 25 shell/accessory, code J, coupling is 1.625-10x3
====Pg-29             37.0-18, 37.0x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG29              some cable glands for up to 29mm cable
====M37x1.5           DIN 13-6
 %  M37x1.5           some cable glands
    M37x1.5           some mechanical tube interconnections, hydraulic hinges
 t  M37x1.5           on some adjustable reamers (Beck)
H   W37x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W37x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  GPI38(x4)         37x4, Glass Packaging Institute (North American); plastic/buttress?; see also GPI33
 h  1.468-14          antique geodetic/surveying gear, pre-standard, female on tripod
@   M37.5x0.5         DIN 13-3
 o  M37.5x0.5         some lens mounting rings, eg. Thorlabs
 o  M37.5x0.5         optical filter, outer dia usual 39.5   aperture usual 32.5, on some CS-mount lenses
 o  M37.5x0.5         common in machine vision
@   1.4833-12         STI-1.3/8-12, 37.7x2.12; screw thread insert thread, ASME B18.29.1
 h  1.485-18          antique geodetic/surveying gear, pre-standard, male on tripod; L. Beckmann Co. of Toledo, Ohio
=== G1.1/8(-11)       G37.897x2.309, high pressure copper, W1.492-11, W37.897x2.309; BSP pipe thread; BS EN ISO 0228 (BSPP); ISO 228-1 (parallel); Whitworth pipe thread (Machinist Handbook 1909)
@   M38x0.35          DIN 13-2
@   M38x0.5           DIN 13-3, DIN 519 (3st)
 o  M38x0.5           some lens mounting rings, eg. Thorlabs
 o  M38x0.5           optical filter, uncommon; on eg. Meopta C-mount lenses; some Thorlabs tube lenses
 o  M38x0.5           optical filter; on Meopta C-mount primes, Bolex 26mm lens, and others
@o  1.4961-36 NS      38.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M38x0.75          DIN 13-4
 o  M38x0.75          lens mount, some thermal imaging lenses
 o  M38x0.8           lens mount, Cooke Amotal lens
====M38x1             SI M.ME, ISA E (1940), DIN 13-5
 o  M38x1             lens mount, some thermal imaging lenses, uncommon
    M38x1             circular connectors, MIL-DTL-38999; series III,IV size 21 panel nut
====M38x1.5           ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MD, ISA D (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M38x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M38x1.5           metric pipe thread DIN 7631
 %  M38x1.5           tube coupling, 28mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M38x1.5           standard bioreactor lid stirrer port; motor flange on standard bioreactors, female on port
    M38x1.5           heating radiator valve thread, outside for thermostatic heat attachment; Ondal, Meges
    M38x1.5           Amphenol, AHDM size 24 connectors, backshell
====M38x2             SI M.MC, ISA C (1940), DIN 13-7, DIN 247
====M38x2.5
!S  M38x2.5           on lamps, lampshade thread, "M38", nuts for lamps, thread on outside of lightbulb sockets; see also M28x2 (E14), M33x1.5 (UNO), M40x2.5 (E27)
    M38x2.5           on some water level sensors
 %  M38x2.5           some compression hydraulic fittings, steel, 42mm tube
====M38x3             SI M.MB, ISA B (1940), DIN 13-8, DIN 246
 t  M38x3             some woodturning/metal lathe chucks; Habegger Neotor, Schaublin 102/102VM,...
@   S38x3             buttress thread, fine, 33°, DIN 514
L   Tr38x3            trapezoidal fine, 30°, DIN 103; for leadscrews
 p  38x3              plastic bottle caps
 p  38-8              glass/plastic bottle thread, SP-100,444; 38-100, 38-444
 p  GL38(x3)          DIN 6063-2; GL38 short, foldable canister; 4L BHD bottle, Fulltime reagents
 p  S38(x3)           DIN 6063-1; plastic; 2.5L canister from Recipe, HPLC-P water, 1L Biosolve, Fresenius Kabi 10L
@   Rd38(-8)          round/knuckle thread, DIN 405, secondary size
 p  Alcoa-1690        38-8, plastic bottle thread, 630°; CSD (carbonated soft drinks) [ref]
 p  PCO38             38-8, PCO-38, plastic bottle thread, 720°; CSD (carbonated soft drinks) [ref]
H   38x3.5            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
@   M38x3.5           "4th choice/avoid"
 p  38-7              glass bottle, top-and-side seal finish; 38-1651
H   38x4              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   38x4              SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M38x4             "French metric" (Machinists Handbook 1909)
H   38x4.167          Bodmer Thread, historical, 50°; for mechanical and optical instruments
 p  38-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 37.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  38-6              glass bottle, roll-on finish; 38-1620
 p  PCF-38P-4         38-6, PCF38, plastic bottle thread, 360°; beverages, hot fill [ref]
 p  PCF-38P-5         38-6, PCF38, plastic bottle thread, 360°; beverages, noncarbonated [ref]
!p  SP38(-6)          38SP, glass/plastic bottle thread, SP-400,430,485; 38-400, 38-430, 38-485; 38-400 common in industry; wide-mouth beverage PET bottles; also spigot closure, dropper tip (400); Nalgene media bottles, multiport caps, septum caps, Erlenmeyers (430), common; 38-740 for food canning; on glass jugs
 p  GL38(-6)          GPI38-400 (short), (nonstandard?) glass Wheaton/Nalgene bottles, plastic Recipe/Biosolve/HPLC Water/Fresenius Kabi
 p  GL38(-6)          GPI38-430 (long); Wheaton, Nalgene 4-edge 500mL plastic bottle
 p  38 SWTE           38x6, plastic canister thread, 405°
L   Tr38x7            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
@   S38x7             buttress thread, coarse, 33°, DIN 513
 p  38x7.62x3         38 DBJ, plastic bottle thread, 2-start 140-deg, 3.333 tpi
 p  38x7.26x2         plastic bottle thread, 2-start HF Bericap, 180-deg
 p  38x9x3            plastic bottle thread, 3-start CF Bericap, 120-deg
 p  PCF-38G-3         38-3.5x2, PCF38, plastic bottle thread, two-start, 3.5tpi per start, 123° 180° apart; beverages, hot fill [ref]
 p  PCF-38P-1         38-3.5x2, PCF38, plastic bottle thread, two-start, 3.5tpi per start, 180° each; beverages, hot fill [ref]
 p  PCF-38P-2         38-4x2, PCF38, plastic bottle thread, two-start, 4tpi per start, 180° each; beverages, hot fill [ref]
 p  GME 30.25         38x9x3, 38/33.4-16.5-3/9, EN 16068 plastic bottle thread, three-start
 p  38-2x4            glass bottle, press-on twist-off finish, 4-start; 38-2225
 p  38-1.5x4          glass bottle, press-on twist-off finish, 4-start; 38-2225
 p  38-1x3            glass lug vacuum-seal bottle, 3-start; 38-2000, GME 20.01, ISO 9100-3, FD 146, WGF-146S (regular); 38-2090, GME 20.02, ISO 9100-4, FD 145E, WGF-145E (medium, less common); FD-145B, WGF-145B (deep)
*   1.1/2" copper     ...see 1.655-20, W42.04x1.27
*   1.1/2" NPT        ...see ~1.29/32-11.5, M48.26x2.21
*   1.1/2" BSP        ...see G1.1/2, W 1.7/8-11 W47.63x2.31
*   1-1/2" NPSH       ...see 1.878-11.5; hose thread; most common smaller US firehose
*   1.1/2 JIC         ...see 1.7/8-12; fittings/tubes, dash size -24, nominal inner dia 1.5"
===== 1.1/2" Cu tube  DN40, 38.10mm outer-diameter tube; AS 1432 wall thick 1.63mm/16g (A/green, 3.10 MPa), 1.22mm/18g (B/blue, 2.30MPa), 0.91mm/20g (D/black, 1.69 MPa); AS/NZS 1571, wall thick 1.22mm (2.43 MPa), 2.29mm (4.69 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
@   1.1/2-40
@   1.1/2-32 UNS
 o  1.1/2-32 UNS      lens mount, US standard series, male on lens, PH3.10
====1.1/2-28 UN       28UN, 28-thread, primary size, constant pitch series, UN (H28 1963)
@   1.1/2-27
@   1.1/2(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
@   1.1/2-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
 o  1.5-24 Whitw.     British camera lens flange fittings, R.P.S. standard
H   1.1/2-24 CEI      Original Cycle, British bicycles, 60°, historical
@   1.1/2-24 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====1.1/2-20 UN       20UN, 20-thread, primary size, constant pitch series, UNS (H28 1957), UN (H28 1963)
@   1.1/2-20 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
*   1.1/2-20 copper   ...see 1.655-20, W42.04x1.27
=== 1.1/2(-18) UNEF   M38.10x1.411, primary size; SAE extra fine (1915/1926), ANEF (H28 1944), NEF (H28 1950/1957), UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
 t  1.1/2-18          on boring heads/shanks (also 7/8-20)
 C  1.1/2-18 UNEF     circular connectors, DE Group Series 16, size 24, "business-end" thread
 C  1.1/2-18          circular connectors, MIL-DTL-5015; size 24, coupling (Conxall)
 C  1.5-18 UNEF       circular connectors, MIL-DTL-5015; size 24, coupling (J) (1.4375-18 UNEF for accessory)
    1.500-18 UNEF     circular connectors, MIL-DTL-38999; series I size 21 panel nut, series II size 19 panel nut
    1.500-18 UNEF     circular connectors, MIL-DTL-83723; size 22, mounting nut
 h  1.500-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
@   38.10-16          CTC 39-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
====1.1/2-16 UN       16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957, H28 1963); originally for adjusting collars, retaining nuts
 %  1.1/2-16          on oil filters; lube, hydraulic; pretty common
    1.1/2-16          small aircraft axle nuts, hex castle nuts, for 600x6 axles; see also 1.1/4-16, 1.1/4-12, 1.1/2-12
 h  1.500-16          antique geodetic/surveying gear, pre-standard, male on tripod
 h  1.500-16          antique geodetic/surveying gear, pre-standard, female on tripod
@   1.5-16 BUTT       buttress thread, 7/45°, ANSI B1.9
@   ET1.1/2           W1.1/2-14, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
@   1.1/2-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  1.500-14          antique geodetic/surveying gear, pre-standard, female on tripod; Simplex 12 inch Builder's Dumpy Level
*   1.1/2-12 STI      ...see 1.6083-12, 40.9x2.12 (screw thread insert)
H   1.1/2(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines; 38.1x2.117
@   1.1/2-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.1/2(-12) UNF    M38.10x2.117, primary size, 12UN, SAE regular, 12AN, ANF (NSTC 1921/1924), ANF/AN (NSTC 1928/1933, H28 1942/1944), "series B" (TM 9-254, 1958), NF/N (B1.1-1935), UNF (H28 1950/1957, H28 1963), JIS B 0212, aeronautical (H28 1944), BS 1580:1962
c   1.1/2-12 UN       UNF standard; 12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
 %  1.1/2-12          JIC tube fittings
 %  1.1/2-12 UNJF     ports in scientific apparatus vessels; according to: AS5202
 %  1.1/2-12          on oil filters; lube; common-ish
 t  1.1/2-12          some milling machine arbor nuts
    1.1/2-12          small aircraft axle nuts, round castle nuts, for 600x6 axles; see also 1.1/4-16, 1.1/4-12, 1.1/2-16
    1.1/2-12          thread insert, external thread; keylocking heavy duty, 1.1/8-7
 w  1.5-12 UNF-1A     US artillery fuze, timer/point, M776 for 60mm illuminating cartridge M721, multioption M734 for mortars; "M52" series of mortar fuzes
 w  1.5-12 NS-1       US artillery fuze, M527/XM719/M717/M745/M722, generally for 60mm mortars; M751, for 81mm mortars
 w  1.5-12 NS-1 LH    US artillery fuze, base detonating, M62, for 75/105mm recoilless rifle HEAT-T cartridges, 165mm gun HEP cartridges; M91, base detonating, 105mm HEAT-T howitzers, 106mm HEP guns
 h  1.500-12          antique geodetic/surveying gear, pre-standard, male on tripod; Bostrom - Brady
 h  1.500-12          antique geodetic/surveying gear, pre-standard, female on tripod; W. & L.E. Gurley, Used for Architects Wye Levels and other larger Wye levels
@   1.5-12 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1.1/2-11.5 NPT    ...see ~1.29/32-11.5, M48.26x2.21
*   1.1/2-11.5 NPSH   ...see 1.818-11.5; hose thread; most common smaller US firehose
*   1.1/2-11 BSP      ...see G1.1/2, W 1.7/8-11 W47.63x2.31
    1.1/8-11 Whitw.   older British oil switchgear, round copper stud connection to main contacts
@   1.1/2-11
 %  1.1/2-11          tube coupling, JIS 300, 1.1/2 ("-24"), tapered, or 30-deg male flare on male
@   1.1/2-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  1.500-10x2        circular connectors, MIL-PRF-28876, MIL-PRF-64266, size 23, "business end" coupling; 60° stub thread, dual-lead; M34x1 for backshell (MIL-PRF-64266)
 C  1.500-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 23, coupling ("business end")
L   1.1/2-10 ACME     for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   1.5-10 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   1.1/2-8 TWF       Truncated Whitworth Fine; US WW2 wartime standard; flat root/crest, 55°, compatible with BSF; H28 1944
====1.1/2(-8) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
====1.1/2-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), N/UNS (H28 1957), UN (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
    1.1/2-8           lathe spindle mount, common; Logan, Jet, Atlas TH42/5991/3986, Sears 101.2x...
@   1.5-8 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   1.1/2-6 STI       ...see 1.7165-6, 43.6x4.23 (screw thread insert)
H   1.1/2-6           Whitworth thread proposal, 1841; as 1.500-6, 1857
@   1.1/2-6 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1.1/2(-6) BSW     British Whitworth Standard; W38.1x4.23; 55°; also "continental Whitworth"; 1.1/2W6 (former JIS B 0210); BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   1.1/2-6           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   1.1/2-6           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1.1/2(-6) UNC     M38.10x4.233, primary size, 6UN, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), JIS B 0210, BS 1580:1962
    1.1/2-6 UNC       on crane hooks; minimum size for #11 hook/crane, workload limit 8.35 tons (Crosby/Bullard)
 t  1.5-6             woodturning lathe headstock nut
@   1.1/2-6           wooden thread, 60-deg V-thread (some UK tools - Axminster)
@   1.5-6 BUTT        buttress thread, 7/45°, ANSI B1.9
@   1.1/2-5           wooden thread, 60-deg V-thread (US tools - Bealltool)
L   1.1/2-5 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
L   1.1/2-4 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
@   1.1/2-3.5         wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 38mm
L   1.1/2-2.2/3 ACME  for leadscrews, Acme trapezoidal thread, angle 29-deg; very uncommon; stub-thread
L   1.1/2-2           ballscrew, for leadscrews
L   1.1/2-1           ballscrew, for leadscrews
@   M38.5x0.5         DIN 13-3
 h  1.525-16          antique geodetic/surveying gear, pre-standard, male on tripod
 h  1.525-12          antique geodetic/surveying gear, pre-standard, male on tripod; Buff & Buff
 h  1.525-12          antique geodetic/surveying gear, pre-standard, female on tripod; W. & L.E. Gurley, Used for Wye Levels and Dumpy Levels
 h  1.532-10          antique geodetic/surveying gear, pre-standard, female on tripod; A. Lietz Co.
@   M39x0.35          DIN 13-2
@   M39x0.5           DIN 13-3, DIN 519 (2st)
 o  M39x0.5           optical filter, Leica "E39", outer dia usual 41     aperture usual 34
 o  M39x0.5           common in machine vision
 o  M39x0.5           lens mount; Agfa Colostar, some telecentric industrial lenses
@   M39x0.75          DIN 13-4
 o  M39x0.75          some lens mounting rings, eg. in laser optics
 o  M39x0.75          optical filter; on Leica "E39"; uncommon
====W39-26            W39x0.977, "LTM", Whitworth
!o  W39-26            lens mount, "L39", "L-mount", "Leica Thread-Mount", M39 Leica LSM, 26tpi, front focal distance 28.8mm, 35mm cameras with rangefinders; in machine vision; JIIA image size class IV; some vendors with 1mm pitch!!!
 o  W39-26            lens mount, "Paxette" (Braun Paxette cameras), front focal dist. 44mm, on SLR cameras (lens-film distance, FFD, has to accommodate the mirror)
 o  W39-26            lens mount, "Visoflex L39" (Leitz Visoflex I camera), front focal dist. 91.3mm (62.5mm?)
 o  W39-26            lens mount, common standard on photo enlarger lenses; W39-26 lens usually fit to M39x1 adapters but only sometimes vice versa
 o  W39-26            photo adapter, Lenses for Enlargers, Leica-Thread (Whitworth!)
 o  M39x0.977         lens mount, M39x26tpi (Whitworth?)
====M39x1             ISO extended, ISA E (1940), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
!o  M39x1             lens mount, "M39" (Russian M39 cameras), front focal dist. 28.8mm, common on 35mm cameras with rangefinders; in machine vision; JIIA image size class IV
 o  M39x1             lens mount, "ZM39" (Zenit M39), front focal dist. 45.2mm, on SLR cameras; "Paxette mount", focal dist. 44mm; "Zenit S mount", focal 45.46mm
 o  M39x1             lens mount, smaller laser galvo F-Theta scan lens; second most common
====M39-24            M39x1.058, "J-mount", "Canon Screw Mount"
 o  M39-24            lens mount, "Canon S Mount", early Canon cameras; backfocus 28.8mm
=== M39x1.5           ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, ISA D (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M39x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M39x1.5           tube coupling, French millimetric 24-deg seat, 30mm tube
 %  M39x1.5           on oil filters; lube; rare
    M39x1.5           wheel shaft nut
 %  M39x1.75          on oil filters; lube; rare
=== M39x2             common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, MJ, ISA C (1940), SI fine (1971), ANSI/ASME B1.21M aerospace, ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M39x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M39x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type J (39.2 MPa), 28mm tube
 %  M39x2             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 28mm tube; O-ring face seal (JB1887), 25mm tube
H   W39x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   PZ39.0(-12)       gas bottle neck thread; tapered, Whitworth; PZ39.0, PZ30.3, PZ27.8, PZ19.2; GB 8335:2011 (China)
 w  W39-10            WW2 German artillery fuze, Bd.Z.C/38, in grenade base, for capped HE Navy Shells 15cm, 21cm, 24cm, 28cm, 30.5cm, 38cm, 40.5cm
=== M39x3             ISO 261 2nd, ISO secondary fine, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd constant, JIS B 0211, ISA B (1940), DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
    M39x3             stud bolt size, fine; ISO 898-1
H   W39x1/8"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   39x4              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M39(x4)           M39, "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO screws/bolts/nuts, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, ISA A (1940), SI (1971), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
 t  M39x4             woodturning/metal lathe headstock/chuck/spindle nut, King CH-920 AG, Emco Maier Maximat V10,...; some also LH thread
    M39               stud bolt size, ISO 898-1, EN 1993-1-8
@   E39(-4)           Edison thread (E thread DIN 40400), 4tpi (6.35mm); lightbulbs, Mogul/Goliath (GES); 120 V 250+ W industrial; NSTC 1928/1933 (1.545..1.555 base, 1.565..1.577 socket), H28 1942/1944
 o  M39.3x0.7         optical filter; on 16mm Angenieux lenses: Type R41 1.3/15mm; Type S41 1.4/25mm; Type S42 1.4/25mm; Type M1 0.95/25mm; Type P3 2.5/75mm
 o  1.55"-40          lens mount, 39.37x0.635, Kodak Ektar, uncommon
@   M39.5x0.5         DIN 13-3
 o  M39.5x0.5         some lens mounting rings, eg. Thorlabs, Kodak 90mm and 100mm Enlarging Ektar
@o  1.5551-36 NS      39.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, preferred standard
@   1.9/16-32
@   1.9/16-28
@   1.9/16-24
@   1.9/16-24 BSC     British Standard Cycle, bicycles, 60°; less common size?; LH/left; carrier cycle sprockets and lock rings
@   BC 1.9/16-24      BC1'9/16, 39.69x1.058, bicycle thread, general use, freewheel, tang (LH); JIS B 0225
====1.9/16-20 UN      20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  1.9/16-20 UNEF    some safety valves (UN instead of UNEF?)
====1.563-18 UNS      ABMA #8 locknut, N-08, M39.7x1.41, 1.9/16-18
=== 1.9/16-18 UNEF    M39.6875x1.411, secondary size, ANEF (H28 1944), NEF (H28 1950/1957), UNEF 2nd (H28 1963), aeronautical (H28 1944)
 C  1.563-18 UNEF     circular connectors, MIL-DTL-83723; size 24, coupling ("business end")
    1.5625-18 UNEF    circular connectors, MIL-DTL-38999; series I size 23 accessory
 %  1.563-18 UNEF     conduit fittings, MIL-PRF-24758-2, size E
====1.9/16-16 UN      16UN, 16-thread, secondary size, constant pitch series, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), N (H28 1957), UN 2nd (H28 1963); originally for adjusting collars, retaining nuts
 h  1.562-16          antique geodetic/surveying gear, pre-standard, female on tripod; W. & L.E. Gurley (on solar compass leveling head)
====1.9/16-12 UN      12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
 h  1.562-12          antique geodetic/surveying gear, pre-standard, female on tripod; W. & L.E. Gurley, Used for Wye Levels and Dumpy Levels
====1.9/16-8 UN       8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.9/16-6 UN       6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.9/16-5.5        USS
===== 40mm Cu tube    40mm outer-dia tube; EN 1057, wall th 1.0mm; unusual
H   40-88             Hamann Patronengewinde No.13, pitch 0.288mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
@   M40x0.35          DIN 13-2
H   40-55             Hamann Patronengewinde No.12fl., pitch 0.461mm; on old Hamann lathes, 76°; year 1850, historical; cartridge diameter may vary for other vendors
H   40-55             Hamann Patronengewinde No.12tf., pitch 0.461mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
@   M40x0.5           DIN 13-3, DIN 519 (3st)
H   40-40             Hamann Patronengewinde No.11, pitch 0.635mm; on old Hamann lathes, 64°; year 1850, historical; cartridge diameter may vary for other vendors
H   40-36             Hamann Patronengewinde No.10, pitch 0.705mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
 o  M40x0.706         M40-36; lens mount, microscope objective (like Mitutoyo BD Plan APO); machined with enough tolerances can accept M40x0.75
@   M40x0.75          DIN 13-4
 o  M40x0.75          optical filter; on Canon 8-C 2x
 o  M40x0.75          microscope objective, Tomioka Tominon, uncommon
 o  M40x0.75          lens mount, common on photo and enlarging lenses (also M39-26, M45x0.75); on Copal No.1 shutter; some thermal imaging lenses
 o  M40x0.75          astronomy, "photo thread"; on some telescope focusers
H   40-29.1/13        Hamann Patronengewinde No.9, pitch 0.873mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
H   40-26             Hamann Patronengewinde No.8, pitch 0.976mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
====M40x1             DIN 13-5, SI M.MD, ISA E (1940)
 o  M40x1             lens mount, "M40", Practiflex (focal dist. 45.5mm), old Pentacon, some CCD cameras, some thermal imaging lenses
H   40-22             Hamann Patronengewinde No.7, pitch 1.154mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
H   40-20             Hamann Patronengewinde No.6, pitch 1.270mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
=== M40x1.5           common; ISO 261 3rd, ISO tertiary fine, electrical conduit EN 60423, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA D (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M40x1.5           "E40", electrical conduit
 %  M40x1.5           some tubing/piping systems (also M32x1.5); oil sights
 t  M40x1.5           ER32 collet nut
 C  M40x1.5           "M40" circular connectors
    M40x1.5           bearing retaining locknut, "KM8", ISO 2982 (1971); exhaust nuts
    M40x1.5           threaded-body industrial proximity sensors, eg. induction or photoelectric
    M40x1.5           some industrial swing clamps
H   40-16.3/7         Hamann Patronengewinde No.5, pitch 1.546mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors; pitch in inch bad in original source
H   40-13             Hamann Patronengewinde No.4, pitch 1.953mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
====M40x2             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MB, ISA C (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
 %  M40x2             on oil filters; hydraulic; rare
 %  M40x2             seen on some metric heating radiator piping systems
 w  M40x2             WW2 German artillery fuze, Bd.Z.f.15cm Gr.19 Be, in grenade base, armor piercing high explosive 15cm/21cm grenades
 w  M40x2             WW2 German artillery fuze, Kz C/36, point detonation, in tip, TP navy shells 8.8cm
H   W40x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
====M40x2.5           ISO extended
!S  M40x2.5           on lamps, lampshade thread, for E27 lightbulb thread lamps, DIN 49689 (M8x1, M10x1, IPS 1/8, IPS 1/4, IPS 3/8 can be in base); see also M28x2 (E14), M33x1.5 (UNO), M38x2.5
H   W40x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   40-9.3/11         Hamann Patronengewinde No.3, pitch 2.739mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
H   40-8.75           Hamann Patronengewinde No.2, pitch 2.903mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors; pitch in mm bad in original source
====M40x3             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MA, ISA B (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
    M40x3             standard reinforced concrete rebar couplers
@   S40x3             buttress thread, fine, 33°, DIN 514
 p  KS40(x3)          for plastic containers,    buttress thread DIN 6063-1, 30-deg
 p  KT40(x3)          for plastic containers, trapezoidal thread DIN 6063-2
L   Tr40x3            trapezoidal fine, 30°, DIN 103; for leadscrews
@   M40x3.5           "3rd choice"
!%  DIN 40mm          gas mask filter thread "DIN", round/knuckle thread 3.5mm pitch; masks also take GOST and STANAG filters; common in WW2 by Axis
!%  Rd40x1/7"         gas mask filter thread "STANAG", also "RD40", round/knuckle thread 1/7" pitch (3.63mm), NATO standard gas masks, STANAG 4155:1981, EN 148-1, DIN40 - most common for respirator filters
H   40-6.5            Hamann Patronengewinde No.1, pitch 3.907mm; on old Hamann lathes, 50°; year 1850, historical; cartridge diameter may vary for other vendors
!%  Kr40h4            gas mask filter thread "GOST", round/knuckle thread 4mm pitch, Soviet standard, GOST 8762-75; GOST filter fits STANAG mask but not vice versa
H   40x4.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
@   M40x4             "French metric" (Machinists Handbook 1909), DIN 13-9, DIN 245
 p  GL40(x4)          on glass containers, knuckle thread DIN 168-1; 60° internal, 30° external; in plastic also S40; Merck/Metrohm containers
 p  DIN40             S40, plastic variant of GL40; GL40 cap may fit S40 container due to tolerances
H   40x4              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   40x4              SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
 p  40x4              German bottle closure thread series; depth 1.36mm, crest radius 1.10mm, root radius 0.80mm
H   40.0x4.2          Armengaud thread, V-thread, 76° (later 55°), historical
 p  40-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 39.6mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  SP40(-6)          40SP, glass/plastic bottle thread, SP-400,485; 40-400, 40-485; uncommon
@   Rd40(-6)          round/knuckle thread, DIN 405
@   DN40(-6)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
H   40x4.4 VDI        VDI thread, 53.8°, historical; standardized in Germany in 1888, replaced with SI thread in 1898
H   Lh40x4.4          Lowenherz thread, 53.8°, historical, standardized in 1892; on old measuring instruments, esp. German
H   40x4.860          FS -15, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -15, 1.5748-5.2
@   Rd40(x5)          round/knuckle thread, DIN 20400
@   E40(-4)           Edison thread (E thread DIN 40400), 4tpi (6.35mm); lightbulbs, Mogul/Goliath (GES); BS 98:1962, "Goliath"; 230 V 250+ W industrial
@   S40x7             buttress thread, coarse, 33°, DIN 513
L   M40x7 ACME        for leadscrews, Acme trapezoidal thread, angle 29-deg; metric
L   Tr40x7            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 o  M40.2x0.5         optical filter, on some C/CS-mount lenses, uncommon
====1.1/4-11.5NPSH    1.583-11.5, 1-1/4 NPSH; 41.65x2.209, firehose/hydrant coupling thread; NSTC 1921/1924/1928/1933, H28 1942/1944 (American National Hose Coupling)
@g  W40.3-12          "1.455""; gas bottle neck thread, 55°, tapered 3:26, on larger dia; JIS 8244, SI no. 4d
@   1.5915-6          STI-1.3/8-6, 40.4x4.23; screw thread insert thread, ASME B18.29.1
@   M40.5x0.5         DIN 13-3
 o  M40.5x0.5         some lens mounting rings, eg. Thorlabs, Rodagon
 o  M40.5x0.5         lens mount; on Zeiss Ikon Steritar - a stereo attachment (beam splitter) allowing to take stereo picture pairs, male on atachment
 o  M40.5x0.5         optical filter, standard size, outer dia usual 42.5   aperture usual 35.5, on some C/CS-mount lenses
 o  M40.5x0.5         common in machine vision
 o  M40.5x0.75        optical filter; male on lens, uncommon
 w  1.6-20 UNS-2B     M40.64x1.27, artillery fuze, booster cup thread, female on cup (in 1972 standard)
@   1.6083-12         STI-1.1/2-12, 40.9x2.12; screw thread insert thread, ASME B18.29.1
@   M41x0.5           DIN 13-3
 o  M41x0.5           optical filter thread, Olympus C-3020 camera; Nikon-Rayfact lens; Olympus Camedia 5050, 4040, 3020
 o  M41x0.5           lens mount, standard for tube lenses on some microscopes (Olympus?), linescan lenses, industrial lenses
@   M41x0.75          DIN 13-4
 o  M41x0.75          lens mount, rare, Leica Televid 77; some thermal imaging lenses (common-ish)
 o  M41x0.75          optical filter thread, around the bayonet of the small body Kowa spotting scopes
    M41x1             circular connectors, MIL-DTL-38999; series III,IV size 23 panel nut
 p  S41(x4)           S40/41 (plastic), DIN6063-1; Metrohm/Merck containers; see also S40, GL40
 o  M41.2-26          lens mount, "Wrayflex mount"; focal dist. 42.05mm
*   1.5/8" BSPT       ...see W2.082-11, W52.883x2.309, tapered, high pressure copper
===== 1.1/2" Cu pipe  1.1/2" 38.10mm nominal bore, 1.5/8" 41.275mm outer diameter pipe; ASTM B88 type K/0.072"/1.83mm, L/0.060"/1.52mm, M/0.049"/1.24mm; ASTM 306 copper, 0.042"/1.07mm; plumbing copper pipe in USA/Canada
===== 1.5/8" Cu tube  38.10mm outer-diameter tube; AS/NZS 1571, wall thick 0.91mm (1.66 MPa), 1.22mm (2.24 MPa), 2.41mm (4.55 MPa)
@   1.5/8-32
@   1.5/8-27
@   1.5/8-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
@   1.5/8(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
 o  1.625-24 Whitw.   British camera lens flange fittings, R.P.S. standard
@   1.5/8-24 BSC      British Standard Cycle, bicycles, 60°; carrier cycle sprockets and lock rings
@   1.5/8-24 UNS      UNS (H28 1963)
@   1.5/8-20 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
====1.5/8-20 20UN     UN (H28 1963)
 %  1.5/8-20 NS-3     Swagelok fittings, series 2000, 1.1/4" tubes
=== 1.5/8-18 UNEF     ANEF (H28 1944), NEF (H28 1950/1957), UNEF (H28 1963), aeronautical (H28 1944), BS 1580:1962
    1.5/8-18          circular connectors, MIL-DTL-5015; size 28, fitting
    1.625-18 UNEF     circular connectors, MIL-DTL-38999; series I size 23 panel nut, series II size 21 panel nut
    1.625-18 UNEF     circular connectors, MIL-DTL-83723; size 24, mounting nut
====1.5/8-16 16UN     16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1957, H28 1963), SAE extra fine (unlisted in 1915/1926?); originally for adjusting collars, retaining nuts
    1.5/8-16          common US bathtub drain thread, "fine", 1.1/4 NPSM
@   1.5/8-14 UNS      UNS (H28 1963)
H   1.5/8(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
@   1.5/8-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.5/8-12 12UN     SAE regular; 12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), UN (H28 1957/1963), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  1.5/8-12 UN       tube coupling, 1.1/4 ("-20"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  1.5/8-12          tube coupling, 1.1/4 ("-20"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO  11296-1)
 %  1.5/8-12          tube coupling, 1.1/4 ("-20"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  1.5/8-12          JIC tube fittings, for 1.1/4 tube
 %  1.5/8-12 UN       ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514; AS5202 (for UNJ)
 %  1.625-12 UN       shipboard stuffing tube, ASTM F1836, US, size F
 %  1.5/8-12          on oil filters; lube; unusual
    1.5/8-12          thread insert, external thread; keylocking heavy duty, 1.1/4-12, 1.1/4-7
 h  1.625-12          antique geodetic/surveying gear, pre-standard, male on tripod; David White
*   1.5/8-11 BSPT     ...see W2.082-11, W52.883x2.309, tapered, high pressure copper
@   1.5/8-10 UNS      UNS (H28 1963)
 C  1.625-10x3        circular connectors, MIL-DTL-38999, trapezoid-like triple-start; size 25, coupling ("business end")
@   1.5/8(-8) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956 (secondary size, avoid if possible); in British Standards Interim Report 7270-1919
=== 1.5/8-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), N/UNS (H28 1957), UN (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.5/8-6 6UN       6UN, 6-thread, primary size, constant pitch series, NS, UN (H28 1963)
H   1.5/8-5.5         Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   1.5/8-5.5 UNS     Sellers (1864), USS (Machinists Handbook 1909) (not in US standard bolts and nuts list)
    1.5/8-5.5         in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
    1.5/8-5.5 "UNC"   on crane hooks; minimum size for #12 hook/crane, workload limit 11.15 tons (Crosby/Bullard)
H   1.5/8-5           Whitworth thread proposal, 1841; as 1.625-5, 1857
@   1.5/8-5 BSW       British Whitworth Standard; W41.275x5.08; 55°; also "continental Whitworth"; 1.5/8W5 (former JIS B 0210); Whitworth 1841/1857; mentioned by Sellers (1864); old standard
H   1.5/8-5           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   1.5/8-5           V.St'd (Machinists Handbook 1909)
@   M41.5x0.5         DIN 13-3
 o  M41.5x0.5         some lens mounting rings, eg. Thorlabs
 h  1.638-20          antique geodetic/surveying gear, pre-standard, male on tripod; A. S. Aloe
@   41.910-11         CTG 36-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
@   1.1/4-11 TWPP     Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G1.1/4(-11)       G41.91x2.309, W1.65-11, ~W 1.21/32-11, W41.91x2.31, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 %  1.1/4-11 BSPP     on hydraulic pipes with outer dia approx. 1.11/16"
 %  1.1/4-11 BSP      on oil filters; lube, hydraulic; common
 %  G1.1/4            standard bioreactor side port; "25mm port", male on port
    G1.1/4            backnut for kitchen/bathroom faucets, large
===== 42mm Cu tube    42mm outer-dia tube; ASTM B88M type A/1.8mm, B/1.5mm, C/1.2mm; EN 1057, wall th 1.0,1.2(X),1.5(Y)mm, also 1.0mm chrome-plated; BS 2871, table X (wall th 1.2mm, 3.5 MPa), Y (1.5mm, 3.4 MPa), Z (0.8mm, 2.8 MPa); copper pipe in Europe
@   M42x0.35          DIN 13-2
@   M42x0.5           DIN 13-3, DIN 519 (1st)
@   M42x0.75          DIN 13-4
!o  M42x0.75          lens mount, "T-mount", "T2-mount", 54.85mm backfocus; standard to attach cameras to microscopes; 35mm SLR, up to 43.3mm sensors; in machine vision; JIIA image size class IV; some thermal imaging lenses
 o  M42x0.75          photo adapter, T2-Mount, T-mount (T = Tamron)
 o  M42x0.75          some lens mounting rings
 o  M42x0.75          riflescope objective lens thread, 40mm Meopta scope
====M42x1             ISO extended, DIN 13-5, SI M.ME, ISA E (1940), GOST 9150-59 constant, GOST 24705-81
!o  M42x1             lens mount, "M42", "P-mount", 35mm SLR cameras, universal/common, "P" thread, "Praktica thread mount", "Pentax thread mount", "Universal thread mount", "Universal screw mount"; 35mm SLR, up to 43.3mm sensors; in machine vision, 1st choice; JIIA image size class IV
 o  M42x1             lens mount, Zenit/Praktica/Pentax cameras; P-thread, 45.5mm or 45.46mm flange focal distance; in machine vision, 1st choice; JIIA image size class IV
 o  M42x1             lens mount, "Dalsa Spyder3"; flange focal dist. 6.56mm; up to 43.3mm sensors; in machine vision, 1st choice; JIIA image size class IV
 o  M42x1             photo adapter, Praktica, MTO 11-CA
 o  M42x1             on astronomy telescopes, adaptor at focuser; Russian Telephoto Lens MTO 11-CA
=== M42x1.5           ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M42x1.5 keg       pipe thread, metric taper pipe, DIN 158, DIN 906; female ordinary cylindrical, male taper 1:16
 %  M42x1.5           tube coupling, French millimetric 24-deg seat, 32mm tube
 %  M42x1.5           tube coupling, Komatsu equipment "-24", 30-deg cone (male cone on male)
    M42x1.5           compressor oil sight
=== M42x2             common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M42x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M42x2             ISO 6149 hydraulic ports
 %  M42x2.0           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M42x2             tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M42x2             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M42x2             tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule,                    30mm tube (heavy)
 %  M42x2             tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian heavy, 30mm tube
 %  M42x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 32mm tube
 %  M42x2             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 32mm tube
 %  M42x2             some hydraulic fittings (M28x2, M36x2, M42x2, M48x3)
 %  M42x2             on oil filters; hydraulic, lube; common-ish
 t  M42x2             OZ20 collet nut
    M42x2             compressor oil sight
H   W42x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
@   M42x2.5
 %  M42x2.5           couplers on some car engine water cooling circuits
H   W42x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
=== M42x3             ISO 261 1st, ISO primary fine (coarse), ISO 262 preferred, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-8, DIN 246 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M42x3             couplers on some car engine water cooling circuits
    M42x3             shaft nuts, clutch-fluid caps on some mortorbikes
    M42x3             stud bolt size, fine; ISO 898-1
@   S42x3             buttress thread, fine, 33°, DIN 514
L   Tr42x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   W42x1/8"          Whitworth Fine Thread 2 DIN 240, 55°, historical
@   M42x3.5
=== M42x4             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, JIS B 0211, DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
 p  S42(x4)           DIN42 (often written on cap); Nalgene, Agro Paris Tech 51, Polimoon
@   Rd42(-6)          round/knuckle thread, DIN 405, secondary size
H   42x4.167          Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   42x4.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   42x4.5            S.F. No.7, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   M42x4.5           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M42(x4.5)         M42, common; "1st choice"; ISO 261 1st, ISO primary coarse, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M42               stud bolt size, ISO 898-1, EN 1993-1-8
@   Rd42(x5)          round/knuckle thread, DIN 20400
@   S42x7             buttress thread, coarse, 33°, DIN 513
L   Tr42x7            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
@   1.655(-20)        BS copper pipe thread, BScopper, 1-1/2" inner dia; W42.04x1.27
=====1.1/4" pipe      1.660 in, 42.164 mm outer diameter, DN 32, NPS 1 1/4, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 32mm, ASTM copper tube 35mm, NFPA 33mm; ASTM B42 copper B43 red brass, wall th 0.146"/3.71mm standard, 0.194"/4.93mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
=== NPT 1.1/4(-11.5)  1.653-11.5, M41.99x2.209; IP/IPS/NPS/NPSM straight; NPT/NGT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 %  NPT1.1/4          cable gland, NPT-114 cable 13..20,18..25   42/46
@   M42.5x0.5         DIN 13-3
 o  M42.5x0.5         some lens mounting rings, eg. Thorlabs
@o  1.6732-36 NS      42.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 h  1.675-14          antique geodetic/surveying gear, pre-standard, male on tripod; (taken from a English tripod)
@   1.11/16-32
@   1.11/16-24
====1.11/16-20 UN     secondary size, UN (H28 1963)
 w  1.11/16-20        firearm silencers, SDTA Option A tubes, 1.75" (1.12/16, 1.1/4) tubes
=== 1.11/16(-18) UNEF M42.8625x1.411, secondary size, ANEF (H28 1944), NEF (H28 1950/1957), UNEF 2nd (H28 1963), aeronautical (H28 1944)
    1.6875-18 UNEF    circular connectors, MIL-DTL-38999; series I size 25 accessory
====1.11/16-16 UN     secondary size, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), N (H28 1957), UN 2nd (H28 1963)
@   1.11/16-14
====1.11/16-12 UN     secondary size, UN 2nd (H28 1963)
    1.11/16-12 UN     tube coupling, 1.1/4 ("-20"), O-ring face seal (ORFS, SAE J1453)
====1.11/16-8 UN      8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.11/16-6 UN      UN 2nd (H28 1963)
@   1.11/16-5.5       USS
@   M43x0.5           DIN 13-3
@   M43x0.75          DIN 13-4
 o  M43x0.75          lens mount, on some Schneider-Kreuznach photo enlarger lenses
 o  M43x0.75          optical filter, outer dia usual 45     aperture usual 38, on some C/CS-mount lenses, on Olympus C-4000 camera
 o  M43x0.75          on astronomy eyepieces, "Baader/Takahashi"; Pentax XW - Frontside Camera Adaptor, top of Baader Hyperion eyepieces (for camera adapters), some Takahashi accessories
 o  M43x1             on astronomy telescopes, adaptor at focuser; Vixen
 w  M43x2             ordnance fuze; UT-M88P2 mortar shell fuze; PD-UTU M93P1
H   W43x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W43x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  43x4              on plastic bottles, some with measuring caps (38 and 40 mL)
 p  43-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 41.5mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  PCF-43P-1         43-3.5x2, PCF43, plastic bottle thread, two-start, 3.5tpi per start, 144° 180° apart; beverages, hot fill [ref]
 p  SP43(-6)          43SP, glass/plastic bottle thread, SP-400,444,485; 43-400, 43-444, 43-485; 400 common, also in metal; 43-400 common cosmetic and test jars, food seasoning; 43-485 for food canning
 p  43-1x4            glass lug vacuum-seal jar, 4-start; 43-2010, GME 20.03, ISO 9100-5, FD 157A, WGF-157A
 p  43x?x3            43mm 3-start, plastic bottle thread; three-start, 75°
 w  1.7-14 NS-1A      M43.18x1.81, US artillery ordnance fuze; for older 155mm projectiles (2"-12 for newer)
 w  1.7-14 NS-1/2A    US artillery fuze, point detonation, M8 for 3.2inch mortar gas/smoke cartridges, M49 for 4.2inch mortar HE, M501 time/point for 105mm/155mm howitzers and 4.2in mortars, point M5302 for 57mm rifle ammo, timer/point M776 for illum M721, mutioption M734 for mortars
@   M43.5x0.5         DIN 13-3
 o  M43.5x0.5         some lens mounting rings, eg. Thorlabs
@   1.7165-6          STI-1.1/2-6, 43.6x4.23; screw thread insert thread, ASME B18.29.1
@   M44x0.5           DIN 13-3
 o  M44x0.5           lens mount, on some LOMO 75mm optical blocks
@   M44x0.75          DIN 13-4
 o  M44x0.75          lens mount, on some LOMO 75mm optical blocks, eg. LOMO lenses like OKS1-75-1, OKS6-75-1
 o  M44x0.75          lens mount, some thermal imaging lenses, unusual, back flange dist. 16.8mm
 o  M44x0.75          optical filter, unusual
@   M44x1             DIN 13-5
 o  M44x1             lens mount, 35mm cameras, uncommon; Miranda BM/Miranda Laborec lens, focal dist. 41.46mm
 o  M44x1             on astronomy telescopes, "Zeiss thread"; adaptor at focuser; some Zeiss products and accessories
    M44x1             circular connectors, MIL-DTL-38999; series III,IV size 25 panel nut
 t  M44x1             chuck mount thread, eg. some Chinese woodturning lathes (90mm) (see M14x1, M25x1, M44x1, M67x1)
====M44x1.5           DIN 13-6
====M44x2
@   M44x3
@   S44x3             buttress thread, fine, 33°, DIN 514
L   Tr44x3            trapezoidal fine, 30°, DIN 103; for leadscrews
@   M44x4
@   Rd44(-6)          round/knuckle thread, DIN 405
H   44x4.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M44x4.5           "French metric" (Machinists Handbook 1909)
@   S44x7             buttress thread, coarse, 33°, DIN 513
L   Tr44x7            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 h  1.735-16          antique geodetic/surveying gear, pre-standard, male on tripod; Hunt & Scott
 w  1.740-20 UNS      M44.2x1.27, artillery fuze, secondary thread on artillery point fuze right behind the main 2-20 mount (in 1972 standard)
=== G1.3/8(-11)       G44.323x2.309, W1.745-11, BSP pipe thread, BSPP; ISO 228-1 (parallel); Whitworth pipe thread (Machinist Handbook 1909)
@o  1.7459-36 NS      44.346x0.706, retaining rings, PH3.17 "VI", Photographic Filter Series, US standard
*   1.3/4" copper     ...see 1.929-16, W49.00x1.59
*   1.3/4" BSPP       ...see W2.116-11, W53.746x2.309, parallel
@   1.3/4-32 UNS
 o  1.3/4-32 UNS      lens mount, US standard series, male on lens, PH3.10
@   1.3/4(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
@   1.3/4-26 BSC      British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
 o  1.75-24 Whitw.    British camera lens flange fittings, R.P.S. standard
@   1.3/4-24
====1.3/4-20 UN       20UN, 20-thread, primary size, constant pitch series, UNS (H28 1957), UN (H28 1963)
 C  3/4-20 UNEF       circular connectors, DE Group Series 16, size 12S, "business-end" thread
@   1.3/4-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  1.3/4-18 UNS      circular connectors, DE Group Series 16, size 28, "business-end" thread
 C  1.3/4-18          circular connectors, MIL-DTL-5015; size 28, coupling (Conxall)
 C  1.75-18 UNS       circular connectors, MIL-DTL-5015; size 28, coupling (J) and accessory (H)
    1.750-18 UNS      circular connectors, MIL-DTL-38999; series I size 25 panel nut, series II size 23 panel nut
    1.750-18 UNS      circular connectors, MIL-DTL-83723; size 28 (not in MIL standard?), shell/accessory
=== 1.3/4-16 UN       16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), ANEF/AN (H28 1944), N (B1.1-1935), UNEF (H28 1957), UN (H28 1950/1963), SAE extra fine (1915/1926), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 %  1.3/4-16          on oil filters; hydraulic; unusual
 %  1.750-16 UN       conduit-to-panel fittings, MIL-PRF-24758-5, size E
@   1.75-16 BUTT      buttress thread, 7/45°, ANSI B1.9
*   1.3/4-16 copper   ...see 1.929-16, W49.00x1.59
@   1.3/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
H   1.3/4(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
 S  1.3/4-12 Whitw(?) some old British geodetic instruments (mentioned in 1945 as standardization candidate)
@   1.3/4-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.3/4-12 UN       12UN, 12-thread, primary size, constant pitch series, SAE regular (1915/1926), 12AN, ANF (NSTC 1921), AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  1.3/4-12          JIC tube fittings
 %  1.750-12 UN       shipboard stuffing tube, ASTM F1836, US, size G
 %  1.3/4-12          on oil filters; lube, hydraulic, transmission; common-ish
    1.3/4-12(?)       outside thread on treehouse attachment bolts (TAB) (may be 1.3/4-8?); heavy limb TAB; for standard TAB, short TAB, mini TAB see 1.1/4-12; for German treehouse screw (GTS) see M30
@   1.75-12 BUTT      buttress thread, 7/45°, ANSI B1.9
*   1.3/4-11 BSPP     ...see W2.116-11, W53.746x2.309, parallel
@   1.3/4-10 UNS      ANF (NSTC 1928), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   1.75-10 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
=== 1.3/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 t  1.3/4-8           some woodturning/metal lathe chucks; Sheldon LWQ, Sheldon L44
@   1.75-8 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
====1.3/4(-7) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
====1.3/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
 g  1.3/4-6 ACME      "Autogas ACME", G.31 (according to EN 15202); LPG/propane/butane filling port and connection, male on port, "ACME" standard for vehicles, permanent tanks (US, Canada); also for other gases (NH3,...); also 1.5/16 ACME 2.1/4-6 ACME, 3.1/4-6 ACME
@   1.75-6 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
H   1.3/4-5           Whitworth thread proposal, 1841; as 1.750-5, 1857
@   1.3/4-5 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====1.3/4(-5) BSW     British Whitworth Standard; W44.45x5.08; 55°; BS 84-1956; also "continental Whitworth"; 1.3/4W5 (former JIS B 0210); Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   1.3/4-5           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   1.3/4-5           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 1.3/4(-5) UNC     M44.45x5.08, primary size, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), JIS B 0210, UNC (H28 1950(/1957? check)/1963), BS 1580:1962
    1.3/4-5 UNC       on crane hooks; minimum size for #13 hook/crane, workload limit 13.6 tons (Crosby/Bullard)
@   1.75-5 BUTT       buttress thread, 7/45°, ANSI B1.9
L   1.3/4-4 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
@   1.75-4 BUTT       buttress thread, 7/45°, ANSI B1.9
L   1.3/4-3 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; very uncommon
@   1.3/4-3           wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 44mm
    1.3/4-3.5         wooden thread, encountered on threaded rod of a vise bench, 90°, Lake Erie Toolworks Moxon Vise
@   M44.5x0.5         DIN 13-3
 o  M44.5x0.5         some lens mounting rings, eg. Thorlabs
 o  M44.5x0.5         lens mount, uncommon
@   M44.5x1
 o  M44.5x1           astronomy, "Maksutov Thread"; some intermediate-sized Maksutov telescopes sold by Orion, Sky-Watcher, and others; often user-converted to larger 2" SCT due to lack of accessories
 h  1.755-12          antique geodetic/surveying gear, pre-standard, male on tripod; F. Eckel
 h  1.765-20          antique geodetic/surveying gear, pre-standard, male on tripod; F. J. Sloane & Company, Francis J. Sloane, Baltimore, MD
====1.767-18 UNS      ABMA #9 locknut, N-09, M44.88x1.41, 1.49/64-18
 w  SpM44.96x2        ordnance fuze; MRV-U M85 fuze for 122mm "Grad" rocket warhead
@   M45x0.35          DIN 13-2
@   M45x0.5           DIN 13-3, DIN 519 (2st)
 o  M45x0.5           lens mount, Carl-Zeiss Tessar, uncommon
 o  M45x0.5           optical filter; on KMZ RO2-2M 2/75mm lens, KMZ RO3-3M 2/50mm lens, LOMO OKS1-75-1 in OCT-18
 o  M45-36            optical filter; on Sankor, Singer, Eiki 16C, Eiki 16F, Kowa 16-D, Kowa 16-S, Sun Anamorphic, Angenieux 17-68mm, 17.5-70mm zoom lenses, ...
@   M45x0.75          DIN 13-4
 o  M45x0.75          lens mount, unusual; flange focal dist. 189.8/220.4mm; up to 63mm sensors; in machine vision; JIIA image size class V
 o  M45x0.75          lens mount, 105mm Printing Nikkor
 o  M45x0.75          riflescope objective lens thread, most threaded 40mm objective lenses, Meopta 42mm
====M45x1             ISO extended, DIN 13-5, SI M.ME, ISA E (1940), GOST 9150-59 constant, GOST 24705-81
 o  M45x1             lens mount, some thermal imaging lenses, common, back flange dist. 13/13.9/14.62/15/20mm
=== M45x1.5           common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M45x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M45x1.5           tube coupling, French GAZ 24-deg seat, 33.50mm tube
 %  M45x1.5           tube coupling, French millimetric 24-deg seat, 35mm tube
 %  M45x1.5           tube coupling, 35mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M45x1.5           on oil filters; lube, hydraulic; rare
    M45x1.5           bearing retaining locknut, "KM9", ISO 2982 (1971); shaft end nut
    M45x1.5           on water flow meter capsules; HT1, Metrona Brunata
 %  M45x1.5           fire extinguishers, water/foam/powder; female on bottle
=== M45x2             ISO 261 2nd, ISO secondary fine, electrical conduit DIN 89280, BS 3643-1:1981 2nd constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M45x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M45x2.0           metric pipe thread DIN 7631
 %  M45x2             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M45x2             tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule, 35mm tube (light)
 %  M45x2             tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 34mm tube; DIN "L", 35mm tube
 %  M45x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 34mm tube
 %  M45x2             tube coupling, Chinese, 37deg flare (GB5625.2), 45° flare (GB5626.2), 34mm tube; O-ring face seal (JB1887), 32mm tube
 %  M45x2             fire extinguishers; female on bottle
 %  M45x2             on oil filters; hydraulic; rare
 w  M45x2Sd9          ordnance fuze; UTU-M78 mortar shell fuze
=== M45x3             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, JIS B 0211, ISO 262 2nd choice, SI M.MB, ISA B (1940), DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M45x3             couplers on some car engine water cooling circuits
    M45x3             stud bolt size, fine; ISO 898-1
H   W45x1/8"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   45x4.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
====M45x4             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, JIS B 0211, DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
 p  45x4              German bottle closure thread series; depth 1.36mm, crest radius 1.10mm, root radius 0.80mm
 p  GL45(x4)          on glass containers, knuckle thread DIN 168-1; 60° internal, 30° external; most common on lab bottles; glassware, media bottles, solvent pumps; tubes 3..32mm, aperture 44mm, wrench 42mm; on 40mm glass tubes
 p  DIN45             plastic variant of GL45
 p  S45               plastic variant of GL45; DIN 6063-1, DIN 6063-2; GL45 cap will fit S45 thread due to tolerances
 p  KS45(x4)          for plastic containers,    buttress thread DIN 6063-1, 30-deg; secondary size
 p  KT45(x4)          for plastic containers, trapezoidal thread DIN 6063-2; secondary size
 p  SP45(-6)          SP45, glass/plastic bottle thread, SP-400,444; 45-400, 45-444; 45-400 common in labware, industry
H   45x4.5            Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   45x4.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M45(x4.5)         M45, "2nd choice"; ISO 261 2nd, ISO secondary coarse, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, SI M.MA, ISA A (1940), SI (1971), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M45               stud bolt size, ISO 898-1, EN 1993-1-8
H   45.0x4.6          Armengaud thread, V-thread, 76° (later 55°), historical
@   Rd45(x5)          round/knuckle thread, DIN 20400
H   45.4x5.400        FS -16, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -16, 1.7874-4.7
@   M45.5x0.5         DIN 13-3
 o  M45.5x0.5         some lens mounting rings, eg. Thorlabs
@o  1.7913-36 NS      45.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 w  1.8-16 UNS-1A     US artillery fuze, timer M592 for 106mm flechette M581
 w  1.8-12 UNS-2A     US artillery fuze, base detonation M578 for 105mm cannons with HEP
 w  1.8-12 UNS-2A LH  US artillery fuze, base detonation M534A1 for 105mm gun HEP-T and W-T
 h  1.800-12          antique geodetic/surveying gear, pre-standard, male on tripod; Wm. Young & Sons
 h  1.805-14          antique geodetic/surveying gear, pre-standard, male on tripod
@   M46x0.5           DIN 13-3
 o  M46x0.5           optical filter, on Meopta MeoPro 44mm,50mm riflescope, some industrial entocentric lenses
@   M46x0.75          DIN 13-4
 o  M46x0.75          optical filter, outer dia usual 48     aperture usual 41, on some C/CS-mount lenses; common
 o  M46x0.75          riflescope eyepiece filter thread, some 50mm scopes, Meopta 40mm,42mm,44mm scopes
 o  M46x0.75          some lens mounting rings
@   M46x1
 o  M46x1             lens mount, Reichert Polar, uncommon
    46-24 BSC         on bicycles, bottom bracket; bottom bracket cups, Fauber; LH and RH
====M46x1.5
 %  M46x1.5           cable gland, PG36    cable 22..32  42      // G3/2
H   W46x1/12"         Whitworth Fine Thread DIN LON 282, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W46x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 %  M46x3             couplers on some car engine water cooling circuits
 w  M46x3             WW2 German artillery fuze, Bd.Z.f.10cm Pzgr., in grenade base, armor piercing high explosive 10cm/10.5cm grenades
 w  M46x3             WW2 German artillery fuze, Bd.Z.f.7,5cm Pzgr., in grenade base, armor piercing high explosive 7.5cm grenades
@   S46x3             buttress thread, fine, 33°, DIN 514
L   Tr46x3            trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd46(-6)          round/knuckle thread, DIN 405, secondary size
H   46x4.5            SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M46x4.5           "French metric" (Machinists Handbook 1909)
H   46x5              Bodmer Thread, historical, 50°; for mechanical and optical instruments
@   S46x8             buttress thread, coarse, 33°, DIN 513
L   Tr46x8            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
 h  1.812-12          antique geodetic/surveying gear, pre-standard, male on tripod; C.E. Grunow, NY (Taken from a Wye Level.)
====1.13/16-20 UN     20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.13/16-18
====1.13/16-16 UN     16UN, 16-thread, secondary size, constant pitch series, UN 2nd (H28 1963), 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950/1957), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 C  1.813-16 UN       circular connectors, MIL-DTL-83723; size 28 (not in MIL standard?), coupling ("business end")
====1.13/16-12 UN     12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  1.813-12 UN       shipboard stuffing tube, ASTM F1836, US, size J
@   1.13/16-10
====1.13/16-8 UN      8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.13/16-6 UN      6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.13/16-5         USS
@   M46.5x0.5         DIN 13-3
 o  M46.5x0.5         some lens mounting rings, eg. Thorlabs
@   M47x0.5           DIN 13-3
 o  M47x0.5           optical filter; on some Zeiss standard MK I prime lenses
@   M47x0.75          DIN 13-4
 o  M47x0.75          lens mount, "T-thread", Tokina still cameras, backfocus 55mm
 o  M47x0.75          riflescope objective lens thread, 44mm Meopta scope
    M47x1             on bicycles; T47 threaded bottom brackets
====Pg-36             47.0-18, 47.0x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG36              cable glands for up to 36mm cable
@   M47.5x0.5         DIN 13-3
 o  M47.5x0.5         some lens mounting rings, eg. Thorlabs
*   1.7/8" BSPT       ...see W2.244-11, W56.998x2.309, tapered, high pressure copper
@   1.7/8(-26) BSB    British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
 o  1.875-24 Whitw.   British camera lens flange fittings, R.P.S. standard
@   1.7/8-24
====1.7/8-20 UN       20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
 %  1.7/8-20 UN       Swagelok fittings, 1.5" tubes
    1.875-20 UN       circular connectors, MIL-DTL-83723; size 28 (not in MIL standard?), mounting nut
@   1.7/8-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
=== 1.7/8-16 UN       SAE extra fine (unlisted in 1915/1926?); 16UN, 16-thread, primary size, constant pitch series, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), UN (H28 1957, H28 1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
    1.875-16 UN       circular connectors, MIL-DTL-38999; series II size 25 panel nut
 %  1.875-16 UN       conduit fittings, MIL-PRF-24758-2, size F
@   1.7/8-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
H   1.7/8(-12) ADMF   Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
@   1.7/8-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 1.7/8-12 UN       SAE regular; 12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), UN (H28 1957, H28 1963), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  1.7/8-12 UN       tube coupling, 1.1/2 ("-24"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  1.7/8-12          tube coupling, 1.1/2 ("-24"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  1.7/8-12          tube coupling, 1.1/2 ("-24"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  1.7/8-12          JIC tube fittings, for 1.1/2 tube
 %  1.7/8-12 UN       ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514
 %  1.7/8-12 UN       electrical feedthroughs
 %  1.7/8-11.5        common US bathtub drain thread, "coarse", 1.1/2 NPSM
    1.7/8-12          thread insert, external thread; keylocking heavy duty, 1.1/2-12, 1.1/2-6
 h  1.875-12          antique geodetic/surveying gear, pre-standard, male on tripod; John Roach, of San Francisco, CA (taken from a Wye Level)
 h  1.875-12          antique geodetic/surveying gear, pre-standard, female on tripod; Young & Sons.
*   1.7/8-11 BSPT     ...see W2.244-11, W56.998x2.309, tapered, high pressure copper
@   1.7/8-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 w  1.7/8-10          Japanese WW2 bomb fuzes (Whitworth?); Type 2 No. 50 Ordinary Bomb Model 1 Fuze A-3(f) for Type 2 No.50 ordinary bomb; Type 3 Nose Initiator A-3(e) for Type 99 No.6 smoke bomb; A-3(g) nose fuze for Baka Bomb
=== 1.7/8-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), N/UNS (H28 1957), UN (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.7/8-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
H   1.7/8-5           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   1.7/8-5 UNS       Sellers (1864), USS (Machinists Handbook 1909) (not in US standard bolts and nuts list), NS
    1.7/8-5           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
H   1.7/8-4.1/2       Whitworth thread proposal, 1841; as 1.875-4.5, 1857
@   1.7/8(-4.5) BSW   British Standard Whitworth; 55°; old standard; 1.7/8W4.5 (former JIS B 0210); Whitworth 1841/1857; mentioned by Sellers (1864)
H   1.7/8-4.5         sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   1.7/8-4.5         V.St'd (Machinists Handbook 1909)
====1.1/2-11.5NPSH    1.878-11.5, 1-1/2 NPSH; 47.70x2.209, firehose/hydrant coupling thread, NPSH/IPT 1.5"; NSTC 1921/1924/1928/1933, H28 1942/1944 (American National Hose Coupling), ANSI/ASME B1.20.7
    1.1/2-11.5NPSH    most common smaller firehose in the US, for larger see 2-1/2 NPSH
    1.1/2-11.5NPSH    firefighting, booster hose, 1.1/2" hoses (used instead of 1.1/2-9 NH, contrary to NFPA 1963; result of the 1918 War Industries Board, and 1.1/2-9 NH not standardized until 1957)
    1.1/2-11.5NPSH    firefighting, forestry hose, 1.1/2" hose (USDA 5100-107d specification); 2" hose (USDA 5100-107d specification, but not in common use)
@   47.803-11         CTG 42-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
@   1.1/2-11 TWPP     Truncated Whitworth Parallel Pipe; US WW2 wartime standard; flat root/crest, 55°, compatible with BSPP/G; H28 1944
=== G1.1/2(-11)       G47.803x2.309, W1.8825-11, ~W 1.7/8-11 (W47.802x2.31), BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 %  1.1/2-11 BSPP     on hydraulic pipes with outer dia approx. 1.29/32"
 %  1.1/2-11 BSP      on oil filters; hydraulic; unusual
    G1.1/2            backnut for kitchen/bathroom faucets, large; for syphons
@   M48x0.35          DIN 13-2
@   M48x0.5           DIN 13-3, DIN 519 (1st)
 o  M48x0.6           optical filters, on astronomy 2" eyepieces (less common?)
 o  M48x0.??          astronomy optical filters, Baader Planetarium brand, pitch chosen for cross-compatibility between 0.6 and 0.75
@   M48x0.75          DIN 13-4
 o  M48x0.75          optical filters, on astronomy 2" eyepieces
 o  M48x0.75          lens mount, "M47", optical filter, outer dia usual 50     aperture usual 43, astro filters on 2" telescopes
!o  M48x0.75          lens mount, "M48", "newly emerging de-facto standard", DSLR, replacement for M42 to better use 2" focusers/correctors; 2" filter thread; some thermal imaging lenses
!o  M48x0.75          lens mount, "TFL-II" mount; flange focal dist. 17.5mm; machine vision standard JIIA LE-004 (Jul 2011); in machine vision, 1st choice; JIIA image size class III; see also M35x0.75, TFL
 o  M48x0.75          astronomy, "Wide T Thread", "48mm T Thread"; larger-chip astronomy cameras to reduce vignetting; some drawtubes, reducers, flatteners, off-axis guiders
 o  M48x0.75          astronomy, "2-inch thread" (in USA) (do not confuse with 2"-24 thread)
 o  M48x0.75          optical filters, industry standard for 48mm filters, threads into 2" eyepieces, astronomy
====M48x1             SI M.ME, ISA E (1940), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
====M48x1.5           ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M48x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M48x1.5           tube coupling, French millimetric 24-deg seat, 38mm tube
    M48x1.5           compressor oil sight, Ducati rear wheel nut, wheel shaft nut
    M48x1.5           some safety valves
=== M48x2             common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MC, ISA C (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M48x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M48x2.0           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M48x2             tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M48x2             tube coupling, flat face port with metric threads (ISO 9974-1), seal between male end and flat face in female
 %  M48x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 40mm tube
 %  M48x2             on oil filters; hydraulic; rare
 t  M48x2             OZ25 collet nut
 %  M48x2.5           couplers on some car engine water cooling circuits
=== M48x3             ISO 261 1st, ISO primary fine (coarse), ISO 262 preferred, BS 3643-1:1981 1st constant, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-8, DIN 246 (1st), GOST 9150-59 constant, GOST 24705-81
 %  M48x3             some hydraulic fittings (M28x2, M36x2, M42x2, M48x3)
 %  M48x3             car expansion tank caps, other tank caps/plugs
    M48x3             some high voltage bushings
    M48x3             stud bolt size, fine; ISO 898-1
@   S48x3             buttress thread, fine, 33°, DIN 514
L   Tr48x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   W48x1/8"          Whitworth Fine Thread 2 DIN 240, 55°, historical
=== M48x4             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, JIS B 0211, DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
 %  M48x4             couplers on some car engine water cooling circuits
 p  48-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 47.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  PCF-48P-2         48-6, PCF48, plastic bottle thread, 360°; beverages, hot fill [ref]
 p  SP48(-6)          48SP, glass/plastic bottle thread, SP-400,444,485; 48-400, 48-444, 48-485; 400 common in labs, on 4 oz mayo jars; 400 also in metal, 444 uncommon; 48-485 common sift caps on seasonings
@   Rd48(-6)          round/knuckle thread, DIN 405
@   M48x4.5
H   48x5              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   48x5              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   48x5              S.F. No.8, SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
H   M48x5             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M48(x5)           M48; common; ISO 261 1st, ISO primary coarse, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), JIS B 0209, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M48               stud bolt size, ISO 898-1, EN 1993-1-8
@   Rd48(x5)          round/knuckle thread, DIN 20400
@   S48x8             buttress thread, coarse, 33°, DIN 513
L   Tr48x8            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 p  48-2.25x8         glass bottle, press-on twist-off finish, 8-start; 48-2210
 p  48-2x4            glass bottle, press-on twist-off finish, 4-start; 48-2215
 p  48-1.75x4         glass bottle, press-on twist-off finish, 4-start; 48-2215
 p  48-1x4            glass lug vacuum-seal jar, 4-start; 48-2010, GME 20.03, ISO 9100-5, FD 157A, WGF-157A
 p  PCF-48P-3         48-3.125x3, PCF48, plastic bottle thread, three-start, 3.125tpi per start, 3/8 in travel per turn, 145° 120° apart; beverages, hot fill [ref]
 p  PCF-48P-4         48-2.5x3, PCF48, plastic bottle thread, three-start, 2.5tpi per start, 0.4 in travel per turn, 148° 120° apart; beverages, hot fill [ref]
 p  PCF-48P-5         48-2.5x3, PCF48, plastic bottle thread, three-start, 2.5tpi per start, 0.4 in travel per turn, 148° 120° apart; beverages, hot fill; differs from P-4 in neck shape below thread [ref]
 p  48x?x3            48/41, plastic bottle thread; three-start, 180°
=====1.1/2" pipe      1.900 in, 48.26 mm outer diameter, DN 40, NPS 1 1/2, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 40mm, ASTM copper tube 42mm, NFPA 38/38.1mm, AWWA 45mm; ASTM B42 copper B43 red brass, wall th 0.150"/3.81mm standard, 0.203"/5.16mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
 S  1.1/2 MPT         pipes for survey/geodetic GPS antenna masts; 5/8-11 adapters common
 w  1.9-16 UNS        M48.26x1.59, "1.9 inch fuze", on artillery/ordnance fuzes, less common than 2-20, on cal.75mm and larger (in 1972 standard)
 w  1.9-16 UNS-1A     US artillery fuze, timer M571 for 105mm flechette M494, M711 for flechette 90mm cartridge M580
=== NPT 1.1/2(-11.5)  1.8919-11.5, ~1.29/32-11.5, M48.054x2.21; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
@   M48.5x0.5         DIN 13-3
 o  M48.5x0.5         some lens mounting rings, eg. Thorlabs
@o  1.9094-36 NS      48.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 o  M48.5x0.75        riflescope objective lens thread, 44mm Meopta Optika6 scope
 h  1.912-14          antique geodetic/surveying gear, pre-standard, male on tripod
@   M49x0.5           DIN 13-3
@   M49x0.75          DIN 13-4
!o  M49x0.75          optical filter, standard size, outer dia usual 51     aperture usual 44; on some C-mount lenses; inexpensive filters; eg. Soviet LZOS; on old Exakta/Tessar
 o  M49x0.75          riflescope objective lens thread, Marcool 44mm scopes
@   M49x1             DIN 13-5
    M49x1.5           on some ultrasonic level transducers
@   1.929(-16)        BS copper pipe thread, BScopper, 1-3/4" inner dia; W49.00x1.59
 h  1.937-12          antique geodetic/surveying gear, pre-standard, male on tripod
====1.15/16-20 UN     20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  1.15/16-20 UN-3   Swagelok fittings, series 2400, 1.1/2" tubes
@   1.15/16-18
====1.15/16-16 UN     16UN, 16-thread, secondary size, constant pitch series, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950/1957), UN 2nd (H28 1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
@   1.15/16-14
====1.15/16-12 UN     12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
 w  1.15/16-12        Japanese WW2 bomb fuzes (Whitworth?); B-9(a) tail fuze, B-10(a) tail fuze, for Baka Bomb; D-2(a), D-2(b), and D-2(c) Aerial Burst Tail Fuzes for No.3 Mk 3 or No.25 Mk 3 bombs
====1.15/16-8 UN      8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====1.15/16-6 UN      6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   1.15/16-5         USS
@   M49.5x0.5         DIN 13-3
 o  M49.5x0.75        optical filter; on Angenieux type S3 1.8/75mm, old Arriflex Schneider 10mm f1.8 lens
 w  1.61/64-12        Japanese WW2 bomb fuzes (Whitworth?); Type 99 Special Bomb Tail Fuze C-1(a), for Type 97 No.6 land and Type 98 No.25 land Model 1 bombs
 o  1.965-48          M49.91x0.529; lens mount, flange focal dist. 11.9mm; up to 43.3mm sensors; in machine vision; JIIA image size class IV
====1.967-18 UNS      ABMA #10 locknut, N-10, M49.96x1.41, 1.31/32-18
@   M50x0.35          DIN 13-2
@   M50x0.5           DIN 13-3, DIN 519 (3st)
@   M50x0.75          DIN 13-4
 o  M50x0.75          lens mount, Carl-Zeiss S-Biogon, Rodenstock Apo-Gerogon, uncommon; some thermal imaging lenses
 o  M50x0.75          riflescope objective lens thread
====M50x1             SI M.ME, ISA E (1940), DIN 13-5
 o  M50x1             some microscope objectives
 o  M50x1             lens mount, some thermal imaging lenses, some SWIR/MWIR lenses
====M50x1.5           common; ISO 261 3rd, ISO tertiary fine, electrical conduit EN 60423, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MD, ISA D (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M50x1.5           "E50", electrical conduit
 t  M50x1.5           ER40 collet nut
    M50x1.5           bearing retaining locknut, "KM10", ISO 2982 (1971)
    M50x1.5 LH        bearing retaining locknut, on LIAZ trucks
    M50x1.5           some industrial swing clamps
====M50x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MC, ISA C (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
 %  M50x2             ISO 6149 hydraulic ports
 %  M50x2             fire extinguishers, water/foam/powder, 6-12 kg; female on bottle; uncommon
 %  M50x2             seen on some metric heating radiator piping systems, pneumatic systems, shock absorbers
@   M50x2.5
 %  M50x2.5           couplers on some car engine water cooling circuits
H   W50x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
====M50x3             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, JIS B 0211, SI M.MB, ISA B (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
 %  M50x3             couplers on some car engine water cooling circuits
 w  M50x3             WW2 German artillery fuze, E.Kz.C/28, point detonation, in tip, HE navy shells 7.5cm, 8.8cm and 10.5cm
@   S50x3             buttress thread, fine, 33°, DIN 514
L   Tr50x3            trapezoidal fine, 30°, DIN 103; for leadscrews
 w  50-8              WW2 German artillery fuze, Kz C/27 (Lm), point detonation, in tip, capped HE Navy Shells 12,7cm, 15cm, 20,3cm, 21cm, 28cm and 30,5cm
H   50x4.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
@   M50x4             DIN 13-9, DIN 245
 p  50x4              German bottle closure thread series; depth 1.36mm, crest radius 1.10mm, root radius 0.80mm
 p  GL50(x4)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  DIN50             S50; plastic variant of GL50; on plastic space-saving containers
 p  KS50(x4)          for plastic containers,    buttress thread DIN 6063-1, 30-deg
 p  KT50(x4)          for plastic containers, trapezoidal thread DIN 6063-2
@   Rd50(-6)          round/knuckle thread, DIN 405, secondary size
@   DN50(-6)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
H   50.0x5.0          Armengaud thread, V-thread, 76° (later 55°), historical
@   Rd50(x5)          round/knuckle thread, DIN 20400
H   50x5              Bodmer Thread, historical, 50°; for mechanical and optical instruments
H   50x5              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   50x5              SF, Systeme Francaise, French thread; 60° rounded-root metric-like, historical, before SI standard
@   M50x5             "French metric" (Machinists Handbook 1909)
@   S50x8             buttress thread, coarse, 33°, DIN 513
L   Tr50x8            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 w  1.31/32-12        Japanese WW2 bomb fuzes (Whitworth?); Type 15 Tail Fuze Model 2 and Model 1, B-3(a)
====1.1/2-9 NH        1.990-9, 1.5-9 NH, 50.55x2.822, firehose/hydrant coupling thread, NH/NST 1.5"; NSTC 1933, NFPA 1963
    1.1/2-9 NH        firefighting, booster hose, 1.1/2" hoses (NFPA 1963 requirement, but not commonly used in the U.S. or Canada; see 1.1/2-11.5NPSH instead), 1.3/4" hoses (NFPA 1963 requirement)
    1.1/2-9 NH        firefighting, forestry hose, 1.1/2" hose (USDA 5100-107d specification and NFPA 1963 requirement, but not in common use)
*   2" copper         ...see 2.179-16, W55.35x1.59
*   2" NPT            ...see 2.3/8-11.5, M60.325x2.21
*   2" BSP            ...see G2, W 2.11/32-11 W59.53x2.31
*   2" NPSH           ...see 2.352-11.5; hose thread
*   2 JIC             ...see 2.1/2-12; fittings/tubes, dash size -32, nominal inner dia 2"
===== 2" Cu tube      DN50, 50.80mm outer-diameter tube; AS 1432 wall thick 1.63mm/16g (A/green, 2.31 MPa), 1.22mm/18g (B/blue, 1.71MPa), 0.91mm/20g (D/black, 1.26 MPa); AS/NZS 1571, wall thick 1.22mm (1.81 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
@   2(-26) BSB        British Standard Brass; for thin-walled brass tubes, 55-deg; often used on British gas appliances
 o  2-24 Whitw.       British camera lens flange fittings, R.P.S. standard
@   2-24 UNS
 o  2-24 UNS          lens mount, US standard series, male on lens, PH3.10
 o  2"-24             lens mount, SCT thread, "D02" mount, "small SCT thread" (see also 3.25-16, 3.28-16)
 o  2"-24             astronomy, on telescopes; adaptor at focuser; Celestron/Meade 8 (5..10) Inch SCs, Intes Micro 715; rear cell of the SCT, focal reducers and adapters, some larger Mak scopes
@   2-20 BSC          British Standard Cycle, bicycles, 60°; (not in Guide to World Screw Threads)
====2-20 UN           20UN, 20-thread, primary size, constant pitch series, UNS (H28 1957), UN (H28 1963)
 w  2-20 UNS-1B       fuze well on some mortar shells, eg. 60mm M83A3
@   2-18 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  2-18 UNS          circular connectors, MIL-DTL-5015; size 32, coupling (J) and accessory (H)
 C  2-18 UNS          circular connectors, DE Group Series 16, size 32, "business-end" thread
@   50.80-16          CTC 51-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
====2-16 UN           16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), ANEF/AN (H28 1944), N (B1.1-1935), UNEF (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 %  2.000-16 UN       conduit-to-panel fittings, MIL-PRF-24758-5, size F
 %  2-16              on oil filters; hydraulic; uncommon
@   2-16 BUTT         buttress thread, 7/45°, ANSI B1.9
*   2-16 copper       ...see 2.179-16, W55.35x1.59
@   ET2(-14)          W2-14, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
 w  2-14 Whitworth    fuze well on British WW1 artillery shells, for 18-pounder gun
@   2-14 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
@   2-12              taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 2(-12) UNF        M50.80x2.117, primary size, 12UN, SAE regular (1915/1926), 12AN, ANF (NSTC 1921), AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962
c   2-12 UN           12UN, 12-thread, primary size, constant pitch series; UNF continuation; originally for boiler practice, thin nuts on shafts
 %  2-12              on oil filters; hydraulic, transmission; unusual
 t  2-12              some milling machine arbor nuts
 w  2-12 UNS-1A       ordnance fuze, "2 inch fuze thread", common size, NATO standard for 75mm and larger projectiles; eg. M587 fuze, UTIU-M15 fuze for 155mm M107 HE howitzer projectile, M549 projectiles, for newer 155mm (also 1.7-14 NS), 175mm, 8 inch projectiles, 81mm/4.2in/107mm mortars
 w  2-12 NS-1         US artillery fuze, very common; timer/point M548, M520 for 90-180 (except 175mm) cannons; timer/point M564 for 105mm/155mm/8in projectiles; M562, 4.2in illum mortars; M565, 105mm-8in cannons
 %  2-12 UN           tube coupling, 1.1/2 ("-24"), O-ring face seal (ORFS, SAE J1453)
 %  2.000-12 UN       shipboard stuffing tube, ASTM F1836, US, size K
@   2-12 BUTT         buttress thread, 7/45°, ANSI B1.9
*   2-11.5 NPT        ...see 2.3/8-11.5, M60.325x2.21
*   2-11.5 NPSH       ...see 2.352-11.5; hose thread
*   2-11 BSP          ...see G2, W 2.11/32-11 W59.53x2.31
 %  2-11              tube coupling, JIS 300, 2" ("-32"), tapered, or 30-deg male flare on male
@   2-10 UNS          ANF (NSTC 1928), UNS (H28 1963), ASME B1.1-2003 Appendix D
 w  2-10 NS-1 LH      US artillery fuze, base detonating M68, for 90mm gun
@   2-10 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
H   2(-8) ADMF        Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
=== 2-8 UN            8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   2-8 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
====2(-7) BSF         British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
====2-6 UN            6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   2-6 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2-5 BUTT          buttress thread, 7/45°, ANSI B1.9
H   2-4.1/2           Whitworth thread proposal, 1841; as 2.000-4.5, 1857
@   2-4.1/2 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
====2(-4.5) BSW       British Whitworth Standard; W50.8x5.64; 55°; also "continental Whitworth"; old standard; 2W4.5 (former JIS B 0210); BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   2-4.5             sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   2-4.5             Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 2(-4.5) UNC       M50.80x5.644, primary size, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), "series A" (TM 9-254, 1958), NC (B1.1-1935), UNC (H28 1950/1957/1963), JIS B 0210, BS 1580:1962
    2-4.5 UNC         on crane hooks; minimum size for #14 hook/crane, workload limit 16.8 tons (Crosby/Bullard)
L   2"-4 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
@   2-4 BUTT          buttress thread, 7/45°, ANSI B1.9
@   2-3.5             wooden thread, 60-deg V-thread; ancient Peugeot Freres tools
L   2-3 ACME          for leadscrews, Acme trapezoidal thread, angle 29-deg; very uncommon
@   2-2.5             wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 50mm
@   M51x0.5           DIN 13-3
 o  M51x0.7           optical filter; on Angenieux Type M2 28mm lenses
@   M51x0.75          DIN 13-4
 o  M51x0.75          lens mount, unusual; flange focal dist. 8mm; up to 22.5mm sensors; in machine vision; JIIA image size class III
 p  51-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 49.5mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  SP51(-6)          51SP, glass/plastic bottle thread, SP-400; 51-400; uncommon; 2.5-gal square plastic jugs
 p  S51               S50 with slightly wider outer threads diameter, otherwise identical; DIN50 written on cap
 p  51-1.75x10        glass bottle, press-on twist-off finish, 10-start; 51-2200; FD 148, WGF-148S (press); WGF-148B (press with band)
 o  2.013-24 UNS-2B   lens thread, on digital astro focuser, DFW2 or CFW
====G1.5/8(-11)       G51.333x2.309, W2.021-11; Original Whitworth Pipe Thread (Guide to World Screw Threads)
@o  2.0276-36 NS      51.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
H   51.5x6.000        FS -17, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -17, 2.0276-4.2
@   2.035-40          M51.69x0.635, Thorlabs SM2
 o  2.035"-40         lens mount, 51.69x0.635, microscope objective, Thorlabs SM2, d=51.7mm
@   M52x0.5           DIN 13-3
 o  M52x0.5           optical filter; common-ish
@   M52x0.75          DIN 13-4
 o  M52x0.75          lens mount, "R-mount"; flange focal dist. 46.5mm, sensor size up to 43.3mm; in machine vision, 2nd choice; JIIA image size class IV
 o  M52x0.75          lens mount; most common on underwater compact camera housings (see also M67x0.75, M32x0.5)
 o  M52x0.75          some lens mounting rings, macro rings
 o  M52x0.75          optical filter, standard size, outer dia usual 54     aperture usual 47, common-ish, Canon used on the small primes, such as the 50mm 1.8 mark 1 and the 28mm 2.8, and on some earlier consumer/midrange zoom lenses.
 o  M52x0.75          optical filter; on LOMO Foton zoom lens, on some industrial telecentric lenses
 o  M52x0.75          riflescope objective lens thread, 44mm,50mm Meopta scope
====M52x1             SI M.ME, ISA E (1940), DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M52x1             lens mount, focusing helicoids; on some optical lab kinematic mounts
 o  M52x1             some lens mounting rings, eg. in laser optics
    M52x1             on bicycles; sprocket locknut, sprocket attachment, crank bell
=== M52x1.5           ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M52x1.5 keg       pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 o  M52x1.5           lens mount; common on larger laser optics, eg. beam expanders; also M16x0.75, M22x0.75, M29x1
 %  M52x1.5           metric pipe thread DIN 7631
 %  M52x1.5           tube coupling, French GAZ 24-deg seat, 42.25mm tube
 %  M52x1.5           tube coupling, 42mm tube, metric 60-deg cone (DIN 7631), female cone on male, common in hydraulics
 %  M52x1.5           tube coupling, French GAZ 24-deg seat, 42.25mm tube
 %  M52x1.5           tube coupling, French millimetric 24-deg seat, 40mm tube
 %  M52x1.5           on oil filters; lube; rare
 %  M52x1.5           fire extinguishers, water/foam/powder, big, 25-100 kg; female on bottle
    M52x1.5           oil sights
    M52x1.5           on Ducati motorbike exhaust pipes, on some motorbike shock absorbers
    M52x1.5           some axle nuts
 t  M52x1.5           some machining collets
    M52x1.5           backnut (bottom attachment) thread on larger kitchen/bath faucets
=== M52x2             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MC, ISA C (1940), SI fine (1971), DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M52x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M52x2.0           metric pipe thread DIN 7631
 %  M52x2             tube coupling, DIN 2353, metric, 24deg cone or o-ring or bite ferrule or bite ferrule, 42mm tube (light),  38mm tube (heavy)
 %  M52x2             tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian light, 42mm tube; DIN "L", 42mm tube; Russian heavy, 38mm tube; DIN "S", 38mm tube
 %  M52x2             tube coupling, Chinese, 24deg cone fittings, GB3733.2/GB3734.2; type E (15.7 MPa)/type G (24.5 MPa), 42mm tube
 %  M52x2             fire extinguishers, water/foam/powder; female on bottle
    M52x2             shaft nuts
=== M52x3             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, SI M.MB, ISA B (1940), DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M52x3             couplers on some car engine water cooling circuits
    M52x3             stud bolt size, fine; ISO 898-1
 w  M52x3             ordnance fuze; AUFK-M91 fuze for aircraft bombs
@   S52x3             buttress thread, fine, 33°, DIN 514
L   Tr52x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   W52x1/8"          Whitworth Fine Thread 2 DIN 240, 55°, historical
=== M52x4             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, ISO 262 2nd choice, DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
    M52x4             brake fluid tank caps
@   Rd52(-6)          round/knuckle thread, DIN 405
H   52x5              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M52(x5)           M52; ISO 261 2nd, ISO secondary coarse, ISO 262 2nd choice, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M52               stud bolt size, ISO 898-1, EN 1993-1-8
@   S52x8             buttress thread, coarse, 33°, DIN 513
L   Tr52x8            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   2.1/16-16 UNS     16AN, American constant-pitch, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), N (H28 1950/1957), UNS (H28 1963), aeronautical (H28 1944), ASME B1.1-2003 Appendix D
@   2.1/16-12UN       12UN, 12-thread, constant pitch series; UNF continuation; originally for boiler practice, thin nuts on shafts
    2.063-12 UN       shipboard stuffing tube, ASTM F1836, US, size L
=== G1.5/8(-11)       high pressure copper, W2.082-11, W52.883x2.309, BSPT, tapered; Whitworth pipe thread (Machinist Handbook 1909, diameter specified as W2.021-11, W51.33x2.309)
@   M53x0.5           DIN 13-3
@   M53x0.75          DIN 13-4
 o  M53x0.75          optical filter; on Nikon Repro-NIKKOR 1.0/85mm
 o  M53x0.75          riflescope objective lens thread, 50mm Meopta scope
H   W53x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  53-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 52.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  SP53(-6)          53SP, glass/plastic bottle thread, SP-400,444,485; 53-400, 53-444, 53-485; 53-400 in labs
@   Rd53(x5)          round/knuckle thread, DIN 20400
 p  53-1.75x4         glass lug vacuum-seal jar, 4-start; 53-2020, GME 20.04, ISO 9100-6, FD 136, WGF-136S (regular); 53-2030 (not in specs?, uncommon)
 w  2.095-18 NS-1     US artillery fuze, point detonation, M90 for 57mm HEAT projectile; female thread, whole front cap
 o  M53.5x0.75        lens hood thread on Nikon Coolpix 5700 camera
=== G1.3/4(-11)       G53.746x2.309, W2.116-11, W53.746x2.309, 1.3/4 BSPP, parallel, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909, as W2.047-11); less common size; not used for British Standard Taper Pipe but in BS 2779 (Fastening Threads of BSP sizes)
===== 2" Cu pipe      2" 50.80mm nominal bore, 2.1/8" 53.975mm outer diameter pipe; ASTM B88 type K/0.083"/2.11mm, L/0.070"/1.78mm, M/0.058"/1.47mm; ASTM 306 copper, 0.042"/1.07mm; plumbing copper pipe in USA/Canada
===== 2.1/8" Cu tube  50.80mm outer-diameter tube; AS/NZS 1571, wall thick 0.91mm (1.26 MPa), 1.22mm (1.70 MPa), 1.63mm (2.29 MPa)
@   2.1/8-32
====2.1/8-20 UN       20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   2.1/8-18
====2.1/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine (unlisted in 1915/1926?), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), UN (H28 1957, H28 1963 (2nd)), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
    2.1/8-16          common US bathtub drain thread, "Kohler style"
@   2.1/8-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====2.1/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, SAE regular, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 (2nd)), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
@   2.1/8-10
H   2.1/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
=== 2.1/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935, H28 1950), N/UNS (H28 1957), UN 2nd (H28 1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====2.1/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   2.1/8(-4.5) BSW   British Standard Whitworth; 55°; Whitworth 1857; old standard
H   2.1/8-4.5         sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   2.1/8-4.5         USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909)
    2.1/8-4.5         in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
 p  S55               53.8x5; DIN51; DIN51, HP51, 51 often written on cap
===== 54mm Cu tube    54mm outer-dia tube; ASTM B88M type A/2.1mm, B/1.7mm, C/1.5mm; EN 1057, wall th 1.0,1.2(X),1.5,2.0(Y)mm, also 1.0mm chrome-plated; BS 2871, table X (wall th 1.2mm, 2.7 MPa), Y (2mm, 3.6 MPa), Z (0.9mm, 2.5 MPa); copper pipe in Europe, usually 1.5mm wall
@   M54x0.5           DIN 13-3
@   M54x0.75          DIN 13-4
 o  M54x0.75          lens mount, filter wheels, 2" Crayford-style astro focusers
 o  M54x0.75          riflescope objective lens thread, 50mm Meopta MeoTac scope
 o  M54x0.75          astro photo adapter, Series 7 (e.g. Fisheye-Converter); on newer, smaller William Optics refractors; some telescopes from Bresser, Explore Scientific, Omegon
 o  M54x0.75          astronomy, "M54", lens mount, increasingly on full frame astro-imaging cameras and related adapters from eg. Atik, ZWO, ASA, QHY, etc.
 o  M54x0.75          lens mount, some thermal cameras, back focal dist. 20mm
====M54x1
 o  M54x1             lens mount; common on focusing helicoids; on Kowa 2x Anamorphic attachment (also 57.5mm smooth outer dia)
 o  M54x1             lens mount, some thermal cameras, back focal dist. 20mm/25mm
 o  M54x1             astronomy, focuser drawtubes of some Sky-Watcher and Orion Newtonian reflectors
====Pg-42             54.0-18, 54.0x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG42              some cable glands for up to 42mm cable
====M54x1.5
 %  M54x1.5           cable gland, PG42    cable 30..38  53
 %  M54x1.5           some safety valves
 w  M54x1.5           ordnance fuze; TP-M67P1, for 60mm cal. mortar shells
====M54x2
 %  M54x2             tube coupling, French millimetric 24-deg seat, 45mm tube
====M54x3
 w  M54x3             WW2 German artillery fuze, Bd.f.8,8cm Pzgr., in grenade base, armor piercing high explosive 8.8cm grenades
====M54x4
 p  GL54(x4)          on glass containers, uncommon, not in usual standard set of sizes
 p  DIN54             plastic variant of GL54
 p  B53(-4)           54x6.35, 54x6; 53B, spec B 53; plastic, buttress "typ 2", high collar; "Nalgene B53"; Nalgene, Polimoon; see also B83
@o  2.1396-36 NS      54.346x0.706, retaining rings, PH3.17 "VII", Photographic Filter Series, US standard
 w  2.9/64-4          Japanese WW2 bomb fuzes (Whitworth?); Type 99 No.25 Ordinary Bomb Fuze B-2(a)
@o  2.1457-36 NS      54.5x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 o  2.156-24          54.76x1.06, astronomy, on SBIG astro-cameras and adapters
 h  2.156-12          antique geodetic/surveying gear, pre-standard, male on tripod; possibly Dietzgen
====2.157-18 UNS      ABMA #11 locknut, N-11, M54.79x1.41, 2.5/32-18
@   M55x0.5           DIN 13-3
 o  M55x0.5           lens mount, Carl-Zeiss S-Planar, uncommon; some thermal imaging lenses
@   M55x0.75          DIN 13-4
 o  M55x0.75          lens mount, unusual; up to 63mm sensors; in machine vision; JIIA image size class V
 o  M55x0.75          lens mount; on Rapido FVD-8A attachment, female on atachment
 o  M55x0.75          optical filter, standard size, outer dia usual 57     aperture usual 50; lens mount, Carl-Zeiss ortho-planar, on some C/CS-mount lenses
 o  M55x0.75          riflescope objective lens thread, most threaded 50mm objective lenses, Marcool 50mm, Meopta Optika6 50mm
@   M55x1             DIN 13-5
 o  M55x1             lens mount, smaller laser galvo F-Theta scan lens; uncommon; some thermal imaging lenses
    M55x1             on bicycles; sprocket locknut, sprocket attachment, crank bell
====M55x1.5           common; ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, SI M.ME, ISA E (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M55x1.5           on oil filters; hydraulic; rare
    M55x1.5           some industrial swing clamps
====M55x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-7, DIN 247, SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
    M55x2             bearing retaining locknut, "KM11", ISO 2982 (1971)
 %  M55x2             seen on some metric heating radiator piping systems
====M55x3             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246, SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
@   S55x3             buttress thread, fine, 33°, DIN 514
L   Tr55x3            trapezoidal fine, 30°, DIN 103; for leadscrews
H   55x4.0            PLM thread, about 36'52''° with 1/8 rounding, Compaigne des chemins de fer de Paris a Lyon et a la Mediterranee, year 1875, French, historical
====M55x4             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   Rd55(-6)          round/knuckle thread, DIN 405
H   55x5              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   55.0x5.4          Armengaud thread, V-thread, 76° (later 55°), historical
 p  55x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
@   S55x9             buttress thread, coarse, 33°, DIN 513
L   Tr55x9            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   2.179(-16)        BS copper pipe thread, BScopper, 2" inner dia; W55.35x1.59x1.59
    2.187-12          hose coupling thread for 1.1/2" hose; USA, Underwriter TIP
@   2.3/16-28
@   2.3/16-16 UNS     16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), N (H28 1950/1957), UNS (H28 1963), aeronautical (H28 1944), ASME B1.1-2003 Appendix D
@   2.3/16-12 12UN    12UN, 12-thread, constant pitch series; UNF continuation; originally for boiler practice, thin nuts on shafts
    2.188-12 UN       shipboard stuffing tube, ASTM F1836, US, size M
====2.2031-18 UNS     ABMA locknut, M55.96x1.41, 2.13/64-18
@   M56x0.5           DIN 13-3
 o  M56x0.6           riflescope objective lens thread, some 4-16x50FFP scopes
 o  M56x0.7           optical filter; on Angenieux Type 6x12.5 12.5-75mm zoom lenses
@   M56x0.75          DIN 13-4
 o  M56x0.75          lens mount, "T56", unusual; some LOMO lenses; in machine vision
 o  M56x0.75          astronomy, focuser drawtubes, some small Takahashi telescopes, imaging accessories from PrimaLuceLab
====M56x1             DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M56x1             on astronomy telescopes, adaptor at focuser; Synta Refractors (Bresser, Skywatcher, Konus et. al.); some telescopes, Vixen, Orion, Sky Watcher, espec. SW's ED refractors
=== M56x1.5           ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M56x2             common; ISO 261 1st, ISO primary fine, electrical conduit DIN 89280, BS 3643-1:1981 1st constant, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M56x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
H   W56x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
=== M56x3             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
@   Sg56x3.75 LON 293 fire extinguishers; special thread for fire extinguishing fittings DIN LON 293, British
=== M56x4             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, ISO 262 preferred, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
 %  M56x4             firehose coupling, Italian, UNI 40
    M56x4             stud bolt size, fine; ISO 898-1
 p  GL56(x4)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  S56x4             plastic container thread, smaller opening on UN-approved plastic barrels (larger is S70x6)
!p  BSC56x4           Tri Sure 2", TriSure; buttress thread, on plastic barrels; see also BSC70x6
 p  SP56(-6)          56SP, plastic bottle thread, SP-444
H   W56x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
@   Rd56(x5)          round/knuckle thread, DIN 20400
H   56x5.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   M56x5.5           US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M56(x5.5)         M56; common; ISO 261 1st, ISO primary coarse, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M56               stud bolt size, ISO 898-1, EN 1993-1-8
H   56x5.5            S.F. No.9, French thread, S.F., System Francais; 60°; historical, before introduction of SI
H   W56x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
=== G1.7/8(-11)       high pressure copper, W2.245-11, W57.023x2.309, BSPT, tapered; Whitworth pipe thread (Machinist Handbook 1909)
@   M57x0.5           DIN 13-3
@o  2.2441-36 NS      57.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M57x0.75          DIN 13-4
 o  M57x0.75          riflescope objective lens thread, 50mm Meopta scope
 o  M57x1             lens mount, Bronica S2 medium-format (6x6), backfocus 101.7mm
====G1.7/8(-11)       G57.023x2.309, W2.245-11; Original Whitworth Pipe Thread (Guide to World Screw Threads)
*   2.1/4" copper     ...see 2.429-16, W61.70x1.59
*   2.1/4" BSPP       ...see W2.587-11, W65.71x2.309, parallel
@   2.1/4-32
 o  2.25-24 Whitw.    British camera lens flange fittings, R.P.S. standard
@   2.1/4-24 UNS
 o  2.1/4-24 UNS      lens mount, US standard series, male on lens, PH3.10
====2.1/4-20 UN       20UN, 20-thread, primary size, constant pitch series, UNS (H28 1957), UN (H28 1963)
@   2.1/4-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 C  2.1/4-18 UNS      circular connectors, DE Group Series 16, size 36, "business-end" thread
*   2.1/4-16 copper   ...see 2.429-16, W61.70x1.59
====2.1/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 C  2.25-16 UN        circular connectors, MIL-DTL-5015; size 36, coupling (J) and accessory (H)
@   2.25-16 BUTT      buttress thread, 7/45°, ANSI B1.9
@   2.1/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
@   2.1/4-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
====2.1/4-12 UN       12UN, 12-thread, primary size, constant pitch series, SAE (1915/1926), 12AN, ANF (NSTC 1921), AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  2.1/4-12          on oil filters; lube; unusual
@   2.25-12 BUTT      buttress thread, 7/45°, ANSI B1.9
*   2.1/4-11 BSPP     ...see W2.587-11, W65.71x2.309, parallel
@   2.1/4-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  2.250-10          antique geodetic/surveying gear, pre-standard, male on tripod; C.L. Berger & Sons
@   2.25-10 BUTT      buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
H   2.1/4(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
=== 2.1/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), ANF (NSTC 1928), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 t  2.1/4-8           some woodturning/metal lathe chucks; South Bend, Logan, Sheldon WM-46-P, Sidney Machine Lot 160,...
@   2.25-8 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2.1/4(-6) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
 %  2.1/4 BSF         drum plug, on British mild steel heavy duty drums/barrels, larger bung (smaller is 3/4 BSP), thread length 0.5" minimum
====2.1/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
 t  2.1/4-6           some woodturning/metal lathe chucks; South Bend 183-D,...
 g  2.1/4-6 ACME      LPG/propane/butane, other gases (NH3,...) connection; also 1.3/4-6 ACME, 3.1/4-6 ACME
@   2.25-6 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2.25-5 BUTT       buttress thread, 7/45°, ANSI B1.9
H   2.1/4-4.5         sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   2.1/4-4.5         Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 2.1/4(-4.5) UNC   M57.15x5.644, primary size, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1963), BS 1580:1962
H   2.1/4-4           Whitworth thread proposal, 1841; as 2.250-4, 1857
@   2.1/4-4 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   2.1/4-4 BSW       British Whitworth Standard; W57.15x6.35; 55°; also "continental Whitworth"; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
L   2.1/4-4 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   2.25-4 BUTT       buttress thread, 7/45°, ANSI B1.9
L   2.1/4-3 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
    2.1/4-2           wooden thread, encountered on threaded rod of a vise bench
 h  2.255-12          antique geodetic/surveying gear, pre-standard, male on tripod; Buff & Buff and C.L. Berger & Sons.
 h  2.265-16          antique geodetic/surveying gear, pre-standard, male on tripod; Keuffel & Esser for Expedition or Explorers Transit. 2 17/64 inches X 16 threads.
 h  2.270-10          antique geodetic/surveying gear, pre-standard, male on tripod
@   M58x0.5           DIN 13-3
@   M58x0.75          DIN 13-4
 o  M58x0.75          lens mount, uncommon; flange focal dist. 10mm; up to 86mm sensors; in machine vision, 1st choice; JIIA image size class VII, class IV
!o  M58x0.75          optical filter, standard size, outer dia usual 60     aperture usual 52.9, very common on consumer lenses, vast majority of Canon midrange zooms; some focusing helicoids; some industrial lenses
 o  M58x0.75          optical filter; on Bolex 32/2x; Sankor, Singer, Eiki 16C, Eiki 16F, Kowa 16-D, Kowa 16-S, Sun Anamorphic; shutters: Compur #3, Copal #3, Prontor #3; Canon EOS Digital Rebel 300D digital SLR with 18-55 EFS lens
====M58x1             DIN 13-5
 o  M58x1             lens mount, focusing helicoids
====M58x1.5           ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), GOST 9150-59 constant, GOST 24705-81
    M58x1.5           on water flow meter capsules; M7L, Micro
====M58x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-7, DIN 247, SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
 %  M58x2             tube coupling, French GAZ 24-deg seat, 48.25mm tube
 C  M58x2             "M58" circular connectors
====M58x3             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246, SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
 %  M58x3             couplers on some car engine water cooling circuits
====M58x4             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
 p  58-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 56.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  SP58(-6)          58SP, plastic bottle thread, SP-400,444,485; 58-400, 58-444, 58-485; 58-400 on lab bottles/containers; 58-400 common cosmetic jars; 58-2020 on 8oz mayo jars
@   Rd58(-6)          round/knuckle thread, DIN 405, secondary size
 p  58-1.75x4         glass lug vacuum-seal jar, 4-start, common; 58-2020, GME 20.04, ISO 9100-6, FD 136, WGF-136S (regular); GME 20.05, ISO 9100-7, FD 136A, WGF-136A (deep, less common)
L   Tr58x9            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
 p  58-1.5x10         glass bottle, press-on twist-off finish, 10-start; 58-2220
 o  M58.2x0.75        riflescope objective lens thread, can fit Schmidt and Bender 5-25x56 etc
H   58.4x6.660        FS -18, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -18, 2.2992-3.8
 o  58.6-36           lens mount, some thermal imaging lenses, uncommon
@   2.5/16-18
@   2.5/16-16 UNS     16AN, American constant-pitch, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), N (H28 1950/1957), UNS (H28 1963), aeronautical (H28 1944), ASME B1.1-2003 Appendix D
@   2.5/16-14
 w  2.3125-14 UNS-1A  2.5/16-14, on US mines; common large fuze, eg. M608 fuze on M6 and M15 antitank ines, M23 chemical mine; M624 fuze (M607 fuze in adapter)
 %  2.313-12 UN       shipboard stuffing tube, ASTM F1836, US, size N
@   M59x0.5           DIN 13-3
@   M59x0.75          DIN 13-4
 o  M59x0.75          riflescope objective lens thread, 56mm Meopta MeoStar scope
 o  M59x0.75          on astronomy Lichtenknecker (System 64) eyepieces
 o  M59-12            lens mount, some thermal imaging lenses (common-ish)
====Pg-48             59.3-18, 59.3x1.411, Panzergewinde, 80°, DIN 40430; electrical conduit, obsolete
 %  PG48              cable glands for up to 48mm cable
====2-11.5NPSH        2.352-11.5, 2" NPSH, 59.74x2.209, firehose/hydrant coupling thread, NPSH/IPT 2"; NSTC 1921/1924/1928/1933, H28 1942/1944 (American National Hose Coupling), ANSI/ASME B1.20.7
 t  2.35-8(?)         some woodturning/metal lathe chucks; Jet 1236P,...
@   59.614-11         CTG 54-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
=== G2(-11)           G59.614x2.309, W2.347-11, ~W 2.11/32-11, W59.613x2.31, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); ISO 228-1 (parallel), ISO 7/1 (parallel, tapered); Whitworth pipe thread (Machinist Handbook 1909)
 %  2-11 BSPP         on hydraulic pipes with outer dia approx. 2.3/8"
 %  G2-11             fire extinguishers, water/foam/powder, 50-100 kg; male on bottle, sleeve nut on valve
    G2                backnut for kitchen/bathroom for syphons
    G2                on water flow meter capsules; ST, ISTA, Koax G2; G2 1/4", PolluMuk (Pollux/Sensus)

====2.360-18 UNS      ABMA #12 locknut, N-12, M59.94x1.41, 2.23/64-18
@   M60x0.5           DIN 13-3
@   M60x0.75          DIN 13-4
 o  M60x0.75          lens mount, less common
 o  M60x0.75          on astronomy telescopes, focuser drawtubes; Vixen / GSO 2"- Focuser, some Vixen refractors
 o  M60x0.75          optical filter, unusual
====M60x1             ISO extended, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M60x1             lens mount, some thermal imaging lenses, some SWIR/MWIR lenses
 o  M60x1             some microscope objectives
=== M60x1.5           common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.ME, ISA E (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M60x1.5           cable gland, PG48    cable 34..44  60      // G2
    M60x1.5           on water flow meter capsules; M60, Minol Minocal C5-CMF (Warmezahler, heating meter)
=== M60x2             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M60x2 keg         pipe thread, metric taper pipe, DIN 158; female ordinary cylindrical, male taper 1:16
 %  M60x2.0           tube coupling DIN 7631, 60° cone, metric straight thread, less common
 %  M60x2             tube coupling, metric port and stud ends (ISO 6149), o-ring on male, seal between male base and female top chamfer
 %  M60x2             tube coupling, Russian, eg. on tractors from Belarus, similar to DIN 20078; Russian heavy, 45mm tube
 %  M60x2             ISO 6149 hydraulic ports
 %  M60x2             on oil filters; hydraulic; rare
 %  M60x2             on some gastronomy equipment valves, male on valve; also M68x3, M78x3
    M60x2             on water flow meter capsules; DM1, Deltamess; PCC, Warmezahler Sensus
    M60x2             compressor oil sight
    M60x2             bearing retaining locknut, "KM12", ISO 2982 (1971)
 t  M60x2.5           OZ32 collet nut
H   W60x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
=== M60x3             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
@   S60x3             buttress thread, fine, 33°, DIN 514
L   Tr60x3            trapezoidal fine, 30°, DIN 103; for leadscrews
=== M60x4             ISO 261 2nd, ISO secondary fine (coarse), ISO 262 2nd choice, BS 3643-1:1981 2nd constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
 %  M60x4             couplers on some car engine water cooling circuits
    M60x4             stud bolt size, fine; ISO 898-1
 %  60x4              gas mask filter thread "60mm", round/knuckle thread 4mm pitch (1/6"/4.2mm?); Finnish M51 series, Canadian C3, (Including Dutch export models), American M9 (Including Yugoslavian and Iraqi clones), and also British WW2 D-Day 'Lightweight' respirators and 1950's models
 p  GL60 (x5? x6?)    on glass containers, uncommon, not in usual standard set of sizes
 p  S60               plastic variant of GL60
 p  60-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 59.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  SP60(-6)          60SP, glass/plastic bottle thread, SP-400; 60-400; uncommon
@   Rd60(-6)          round/knuckle thread, DIN 405
H   W60x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W60x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   60x5.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M60(x5.5)         M60; ISO 261 2nd, ISO secondary coarse, ISO 262 2nd choice, ISO 262 preferred, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81, British Standard Metric (SI, wartime emergency)
    M60               stud bolt size, ISO 898-1, EN 1993-1-8
H   60.0x5.8          Armengaud thread, V-thread, 76° (later 55°), historical
@   Rd60(x6)          round/knuckle thread, DIN 20400
 p  60x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
 p  KS60(x6)          for plastic containers,    buttress thread DIN 6063-1, 30-deg
    S60(x6)           also S61; for plastic containers, DIN 6063-1; 60, Mauser 13, RPC Containers C59PP/DIN61 often written on cap
H   60x6              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   W60x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S60x9             buttress thread, coarse, 33°, DIN 513
L   Tr60x9            trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
=====2" pipe          2.375 in, 2.3/8", 60.325 mm outer diameter, DN 50, NPS 2, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 50mm, ASTM copper tube 54mm, NFPA 51mm, AWWA 50/50.8mm; ASTM B42 copper B43 red brass, wall th 0.156"/3.96mm standard, 0.221"/5.61mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
 S  2" MPT            pipes for survey/geodetic GPS antenna masts; 5/8-11 adapters common
@   2.3/8-32
c   2.3/8-20 UN       20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   2.3/8-18
c   2.3/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN (H28 1950/1957, H28 1963 (2nd)), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 %  2.375-16 UN       conduit fittings, MIL-PRF-24758-2, size G
@   2.3/8-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
c   2.3/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, SAE regular, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 (2nd)), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
=== NPT 2(-11.5)      2.3658-11.5, ~2.3/8-11.5, M60.094x2.21; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
    2"(-11.5) NPT     tapered, od=2.375"/60.3mm
 p  2" NPS            drum plug, common on steel drums/barrels, larger bung (smaller is 3/4 NPT), for 57mm (51mm) openings (DN50)
@   2.3/8-10
H   2.3/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   2.3/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
c   2.3/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 t  2.3/8-5           some woodturning/metal lathe chucks; LeBlond,...
H   2.3/8-4.5         sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   2.3/8-4.5         V.St'd (Machinists Handbook 1909)
@   2.3/8(-4) BSW     British Standard Whitworth; 55°; Whitworth 1857; old standard
@   2.3/8-4           USS (Machinists Handbook 1909)
    2.3/8-4           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
 o  M60.75x0.75       riflescope objective lens thread, Marcool 56mm scopes
 w  2.4-18 NS-1       US artillery fuze, timer M84 for 81mm illuminating mortars
@   M61x0.5           DIN 13-3
@   M61x0.75          DIN 13-4
 o  M61x0.75          riflescope objective lens thread, some 6-25x56FFP and 10-40x56FFP scopes, Meopta Optika6 56mm
 p  S61               plastic container thread, S60 with slightly deeper thread
====2.40625-18 UNS    ABMA locknut, M61.12x1.41, 2.13/32-18
@   2.429(-16)        BS copper pipe thread, BScopper, 2-1/4" inner dia; W61.70x1.59
@   2.7/16-16 UNS     16AN, American constant-pitch, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), N (H28 1950/1957), UNS (H28 1963), aeronautical (H28 1944), ASME B1.1-2003 Appendix D
@   M62x0.5           DIN 13-3
@o  M62-36            filter thread, lens accessories attachment, female on lens front, US standard series, PH 3.12, secondary size
@o  2.4409-36 NS      62.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M62x0.75          DIN 13-4
 o  M62x0.75          optical filter, standard size, outer dia usual 64     aperture usual 57.1, on some C/CS-mount lenses
 o  M62x0.75          optical filter; male on lens; Omegaron 135 mm f/4.5, Rodagon 150 mm f/5.6, APO-Gerogon 210 mm f/9, APO-Gerogon 240 mm f/9
 o  M62x0.75          optical filter; on LOMO OKS11-35-1, on Olympus E-10 or E20, Nikon D70 camera
@   M62x1             DIN 13-5
====M62x1.5           ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, SI M.ME, ISA E (1940), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
====M62x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, SI M.MD, ISA D (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
    M62x2             on water flow meter capsules; TE1, Techem
====M62x3             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
 %  M62x3             couplers on some car engine water cooling circuits; VAG (Volkswagen Audi Group) vehicles, 
====M62x4             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
@   Rd62(-6)          round/knuckle thread, DIN 405, secondary size
L   Tr62x9            trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
 o  M62.5x0.5         optical filter, on FL-YFL lenses
 p  63-
====G2.1/8(-11)       G62.662x2.309, W2.467-11; Original Whitworth Pipe Thread (Guide to World Screw Threads)
@   M63x0.5           DIN 13-3
@   M63x0.75          DIN 13-4
 o  M63x1             astronomy, focuser drawtubes, focusers; on some William Optics refractors, TS-Optics telescopes, and 2.5" Feathertouch focusers; Riccardi 2.5" 0.75x Field Flattener
=== M63x1.5           ISO extended, electrical conduit EN 60423
 %  M63x1.5           "E63", electrical conduit
H   W63x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  63-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 62.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
!p  SP63(-6)          63SP, glass/plastic bottle thread, SP-400,444,485; 63-400, 63-444, 63-485; 63-400 on lab containers; 63-445, 63-485 common in industry; 63-445 for food canning; 63-485 less-common sift caps
 p  B63(-6)           62.5x4.23; B63, GPI 63-415; Nalgene containers
 p  GL63(x5)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
@   Rd63(x6)          round/knuckle thread, DIN 20400
!p  63-1.5x4          glass lug vacuum-seal jar, 4-start, common size; 63-2030, GME 20.06, ISO 9100-8, FD 138S, WGF-138S (regular); 63-2035, GME 20.07, ISO 9100-9, FD 138B, WGF-138B (deep, less common)
 p  63-1.25x10        glass bottle, press-on twist-off finish, 10-start; 63-2220, WGF-148S
 p  2" buttress       on some steel drums/barrels, for 63mm openings, "US drum thread"; alternative to standard 2" NPT
 h  2.484-12          antique geodetic/surveying gear, pre-standard, male on tripod
*   2.1/2" copper     ...see 2.679-16, W68.05x1.59
*   2.1/2" BSP        ...see W2.96-11, W75.184x2.309, G2.1/2, BSP pipe thread
*   2.1/2" NPT        ...see ~2.7/8-8, M73.025x3.175
*   2-1/2 NPSH        ...see 2.841-8; most common US firehose
===== 2.1/2" Cu tube  DN65, 63.50mm outer-diameter tube; AS 1432 wall thick 1.63mm/16g (A/green, 1.84 MPa), 1.22mm/18g (B/blue, 1.37MPa), 0.91mm/20g (D/black, 1.01 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
 o  2.5-24 Whitw.     British camera lens flange fittings, R.P.S. standard
@   2.1/2-24 UNS
 o  2.1/2-24 UNS      lens mount, US standard series, male on lens, PH3.10
====2.1/2-20 UN       20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
 %  2.1.2-20 UN       Swagelok fittings, 2" tubes
@   2.1/2-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
*   2.1/2-16 copper   ...see 2.679-16, W68.05x1.59
@   63.50-16          CTC 63-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
====2.1/2-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 C  2.5-16 UN         circular connectors, MIL-DTL-5015; size 40, coupling (J) and accessory (H)
 %  2.500-16 UN       conduit-to-panel fittings, MIL-PRF-24758-5, size G
@   2.5-16 BUTT       buttress thread, 7/45°, ANSI B1.9
@   ET2.1/2           W2.1/2-14, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
@   2.1/2-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
@   2.1/2-12          taper boiler taps, patch-bolt taps; sharp-V 60°, 1:16 taper, dia at 1/4" from tap top end; steam boiler work where steamtight is required; Machinery's handbook, 1919
=== 2.1/2(-12) UNF    M63.50x2.117, primary size, 12UN, SAE regular (1915/1926), 12AN, ANF (NSTC 1921), AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962
c   2.1/2-12 UN       12UN, 12-thread, primary size, constant pitch series; originally for boiler practice, thin nuts on shafts
 %  2.1/2-12 UN       tube coupling, 2 ("-32"), JIC 37-deg flare (SAE J514, ISO 8434-2), flare male on male, common in hydraulics, most common US fitting in Europe
 %  2.1/2-12          tube coupling, 2 ("-32"), SAE straight thread O-ring, O-ring boss (J1926-1, ISO 11296-1)
 %  2.1/2-12          tube coupling, 2 ("-32"), flareless compression (SAE J514, 24deg female flare on male, bite-type ferrule)
 %  2.1/2-12 UNF      ports in scientific apparatus vessels; according to: SAEJ1926-1, SAEJ514
 t  2.1/2-12          some milling machine arbor nuts
@   2.5-12 BUTT       buttress thread, 7/45°, ANSI B1.9
*   G2.1/2-11         ...see W2.96-11, W75.184x2.309, BSP pipe thread
 %  2.1/2-11          tube coupling, JIS 300, tapered, or 30-deg male flare on male
@   2.1/2-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
@   2.5-10 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   2.1/2-8 NPT       ...see ~2.7/8-8, M73.025x3.175
*   2.1/2-8 NPSH      ...see 2.841-8; most common US firehose
H   2.1/2(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
=== 2.1/2-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), ANF (NSTC 1928), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   2.5-8 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2.1/2(-6) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
====2.1/2-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
 %  2.1/2-6           on oil filters; hydraulic; rare
@   2.5-6 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2.5-5 BUTT        buttress thread, 7/45°, ANSI B1.9
H   2.1/2-4           Whitworth thread proposal, 1841; as 2.500-4, 1857
@   2.1/2-4 TWC       Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   2.1/2-4 BSW       British Whitworth Standard; W63.5x6.35; 55°; also "continental Whitworth"; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   2.1/2-4           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   2.1/2-4           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 2.1/2(-4) UNC     M63.50x6.35, primary size, 4UN, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1963), BS 1580:1962
L   2.1/2-4 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   2.5-4 BUTT        buttress thread, 7/45°, ANSI B1.9
L   2.1/2-3 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
L   2.1/2-2 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon, old standard (NSTC 1933)
@   2.1/2-2           wooden thread, 60-deg V-thread (German cutting tools); diameter similar to 62mm
    2.1/2-2           wooden thread, encountered on threaded rod of a vise bench, 60°; Lake Erie Toolworks Wood Vise screw
====2-8 NH            2.515-8, 63.88x3.175, firehose/hydrant coupling thread, NH/NST 2"
===== 64mm Cu tube    64mm outer-dia tube; EN 1057, wall th 2.0mm; copper pipe in Europe
@   M64x0.5           DIN 13-3
 o  M64x0.5           projection lenses, ISCO-OPTIC CINEMASCOPE ULTRA STAR 80mm - 5.15 inch lens, with 52.5mm outer dia tube
@   M64x0.75          DIN 13-4
 o  M64x0.75          astronomy, focuser drawtubes; on smaller Takahashi refractors
====M64x1             ISO extended, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M64x1             some optical filters or lens mounts
    M64x1             on water flow meter capsules
====M64x1.5           ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, SI M.ME, ISA E (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M64x1.5           on some hydraulic equipment, DIY cylinders
=== M64x2             common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-7, DIN 247 (1st), GOST 9150-59 constant, GOST 24705-81
    M64x2             on water flow meter capsules; MET, Metrona
 t  M64x2             ER50 collet nut
=== M64x3             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246 (1st), GOST 9150-59 constant, GOST 24705-81
=== M64x4             ISO 261 1st, ISO primary fine (coarse), ISO 262 preferred, BS 3643-1:1981 1st constant, SI M.MB, DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
    M64x4             stud bolt size, fine; ISO 898-1
H   W64x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W64x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
====M64x5.5           ISO extended
H   64x6              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   M64x6             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M64(x6)           M64; common; ISO 261 1st, ISO primary coarse, ISO 262 preferred, BS 3643-1:1981 1st coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-1, GOST 9150-59 coarse, GOST 24705-81
    M64               stud bolt size, ISO 898-1, EN 1993-1-8
H   64x6              S.F. No.10, French thread, S.F., System Francais; 60°; historical, before introduction of SI
H   W64x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
 w  2.17/32-4         Japanese WW2 bomb fuzes (Whitworth?); Type 99 No.80 Mk.5 Bomb Fuze B-2(b)
====2.548-18 UNS      ABMA #13 locknut, N-13, M64.72x1.41, 2.35/64-18
@   M65x0.5           DIN 13-3
@   M65x0.75          DIN 13-4
 o  M65x0.75          optical filter; on Angenieux 9.5-57mm zoom lens
@   M65x1             DIN 13-5
 o  M65x1             lens mount, Chinese focusing helicoids; some thermal imaging lenses (common-ish)
====M65x1.5           common; ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 1st constant, SI M.ME, ISA E (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 o  M65x1.5           lens mount, microscope objectives; Z16A microscope
 %  M65x1.5           some cable glands, PG
    M65x1.5           some bearing nuts, car wheel axle nuts
    M65x1.5           some industrial swing clamps
====M65x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 1st constant, SI M.MD, ISA D (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
    M65x2             on water flow meter capsules; ABB MOE, ABB MOC
    M65x2             bearing retaining locknut, "KM13", ISO 2982 (1971)
====M65x3             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 1st constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
====M65x4             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 1st constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
@   S65x4             buttress thread, fine, 33°, DIN 514
 p  S65(x?)           plastic container thread; on Kautex round canisters
L   Tr65x4            trapezoidal fine, 30°, DIN 103; for leadscrews
H   65x6              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
@   Rd65(-6)          round/knuckle thread, DIN 405
@   DN65(-6)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
 p  65x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
 p  S65(x6)           plastic; for round containers Kautex
H   65.0x6.2          Armengaud thread, V-thread, 76° (later 55°), historical
@   S65x10            buttress thread, coarse, 33°, DIN 513
L   Tr65x10           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
 h  2.562-12          antique geodetic/surveying gear, pre-standard, male on tripod; Eugene Dietzgen
 h  2.578-12          antique geodetic/surveying gear, pre-standard, male on tripod; Eugene Dietzgen
=== G2.1/4(-11)       G65.71x2.309, W2.5875-11, W65.71x2.309, 2.1/4 BSPP, parallel, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); Whitworth pipe thread (Machinist Handbook 1909); less common; not used for British Standard Taper Pipe but in BS 2779 (Fastening Threads of BSP sizes)
@   M66x0.75          DIN 13-4
    M66x0.75          optical filters, nonstandard size; on early KMZ Helios, then changed to M67x0.75
    M66x1             on water flow meter capsules; HT2, Metrona Brunata 307/1
    M66x1.25          on water flow meter capsules; WGU, Wassergerate
H   W66x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  66-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 65.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  66-6              glass/plastic bottle thread, SP-400; 66-400; uncommon
 p  66-1.5x4          glass lug vacuum-seal jar, 4-start; 66-2030, GME 20.06, ISO 9100-8, FD 138S, WGF-138S (regular); 66-2035, GME 20.07, ISO 9100-9, FD 138B, WGF-138B (deep, less common)
 p  66-1.25x10        glass bottle, press-on twist-off finish, 10-start; 66-2220
H   66.3x7.400        FS -19, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -19, 2.6102-3.4
 o  M66.5x0.5         optical filter; on Angenieux Type M1 50mm lenses
===== 2.1/2" Cu pipe  2.1/2" 63.50mm nominal bore, 2.5/8" 66.675mm outer diameter pipe; ASTM B88 type K/0.095"/2.41mm, L/0.080"/2.03mm, M/0.065"/1.65mm; plumbing copper pipe in USA/Canada
===== 2.5/8" Cu tube  63.50mm outer-diameter tube; AS/NZS 1571, wall thick 1.22mm (1.37 MPa), 1.63mm (1.84 MPa), 2.03mm (2.31 MPa)
====2.5/8-20 UN       20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 %  2.5/8-20 UN-3     Swagelok fittings, series 3200, 2" tubes
@   2.5/8-18
====2.625-18 UNS      ABMA locknut, M66.68x1.41, 2.5/8-18
c   2.5/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
@   2.5/8-14
c   2.5/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, SAE regular, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
H   2.5/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   2.5/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
c   2.5/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   2.5/8(-4) BSW     British Standard Whitworth; 55°; Whitworth 1857; old standard
H   2.5/8-4           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
c   2.5/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), UN 2nd (H28 1963)
    2.5/8-2           wooden thread, encountered on threaded rod of a vise bench, BigWoodVise classic kit
===== 66.7mm Cu tube  66.7mm outer-dia tube; EN 1057, wall th 1.2,2.0mm; copper pipe in Europe
@o  2.6317-36 NS      66.846x0.706, retaining rings, PH3.17 "VIII", Photographic Filter Series, US standard
===== 67mm Cu tube    67mm outer-dia tube; ASTM B88M type A/2.4mm, B/2.0mm, C/1.6mm; BS 2871, table X (wall th 1.2mm, 2 MPa), Y (2mm, 2.8 MPa), Z (1mm, 2 MPa)
@   M67x0.75          DIN 13-4
 o  M67x0.75          lens mount, less common; flange focal dist. 505mm (50.5mm?); up to 63mm sensors; in machine vision; JIIA image size class V
 o  M67x0.75          lens mount; most common on underwater DSLR/mirrorless housings (see also M52x0.75); on Olympus underwater macro conversion lens (PTMC-01) and underwater wide conversion lens (PTWC-01), male on atachment
 o  M67x0.75          optical filter, standard size, outer dia usual 70     aperture usual 61.8, common on underwater lenses, common-ish, only used on few lenses, Canon few midsize zooms L and non-L; industrial telecentric lenses
 o  M67x0.75          optical filter, on Swarowski ATX65/BTX65 spotting scope, female on lens; on Tair-56A lens
 o  M67x1             optical filter
 t  M67x1             chuck mount thread, eg. some Chinese woodturning lathes (125mm) (see M14x1, M25x1, M44x1, M67x1)
@   Rd67(x6)          round/knuckle thread, DIN 20400
 t  2.656-8(?)        some woodturning/metal lathe chucks; Barker,...
 o  M67.7x0.7         attachments like Sankor 5E; also 70.65mm inner dia
 o  M67.7-36          lens mount; on front part of Schneider-Kreuznach Cinelux-Ultra 90mm F2 projection lens
@   M68x0.5           DIN 13-3
@   M68x0.75          DIN 13-4
 o  M68x0.75          optical filter
 o  M68x0.75          lens mount; on FM Lens anamorphic attachment, male on atachment
 o  M68x0.75          astronomy, focuser drawtubes; Hexafoc focuser on some Bresser/Explore Scientific telescopes, some Omegon telescopes
====M68x1             ISO extended, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M68x1             on astronomy telescopes, adaptor at focuser; Astro Zeiss extension
 o  M68x1             lens mount, Pentacon Six (P6) cameras
=== M68x1.5           ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.ME, ISA E (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
=== M68x2             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M68x2             on oil filters; hydraulic; rare
 t  M68x2.5           OZ40 collet nut
=== M68x3             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
 %  M68x3             on some gastronomy equipment valves, male on valve; also M78x3, M60x2
=== M68x4             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
    M68x4             stud bolt size, fine; ISO 898-1
@   Rd68(-6)          round/knuckle thread, DIN 405, secondary size
H   W68x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W68x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   68x6              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
=== M68(x6)           M68, ISO 261 2nd, ISO secondary coarse, BS 3643-1:1981 2nd coarse, "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909), SI M.MA, ISA A (1940), SI (1971), DIN 13-1, GOST 9150-59 coarse, GOST 24705-81
    M68               stud bolt size, ISO 898-1, EN 1993-1-8
 p  68x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm (for honeyjars only)
H   W68x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
L   Tr68x10           trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
@   2.679(-16)        BS copper pipe thread, BScopper, 2-1/2" inner dia; W68.05x1.59
@   2.11/16-18
@   2.11/16-16
@   2.11/16-12
 %  2.688-12 UN       shipboard stuffing tube, ASTM F1836, US, size P
@   M69x0.75          DIN 13-4
 o  M69.5-24          on astronomy telescopes, Astrophysics Traveler 2.7" focuser, adapter side
 o  2.74-24           astronomy, Astro Physics telescopes and accessories, male thread (see 2.754-24 for female therad)
*   2.3/4" copper     ...see 2.929-16, W74.40x1.59
*   2.3/4" BSPP       ...see W3.21-11, W81.534x2.309, parallel
@   2.3/4-24 UNS
 o  2.3/4-24 UNS      lens mount, US standard series, male on lens, PH3.10
====2.3/4-20 UN       20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
====2.751-18 UNS      ABMA #14 locknut, N-14, M69.88x1.41, 2.3/4-18
@   2.3/4-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====2.3/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 C  2.75-16 UN        circular connectors, MIL-DTL-5015; size 44, coupling (J) and accessory (H)
@   2.75-16 BUTT      buttress thread, 7/45°, ANSI B1.9
*   2.3/4-16 copper   ...see 2.929-16, W74.40x1.59
@   2.3/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  2.750-14          antique geodetic/surveying gear, pre-standard, male on tripod; David White
 h  2.750-13          antique geodetic/surveying gear, pre-standard, male on tripod
====2.3/4-12 UN       12UN, 12-thread, primary size, constant pitch series, SAE regular (1915/1926), 12AN, ANF (NSTC 1921), AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935, H28 1950), UN (H28 1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
@   2.75-12 BUTT      buttress thread, 7/45°, ANSI B1.9
*   2.3/4-11 BSPP     ...see W3.21-11, W81.534x2.309, parallel
@   2.3/4-10 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
@   2.75-10 BUTT      buttress thread, 7/45°, ANSI B1.9
H   2.3/4(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====2.3/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), ANF (NSTC 1928), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   2.75-8 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2.3/4(-6) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
====2.3/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
 t  2.3/4-6           some woodturning/metal lathe chucks; Monarch,...
@   2.75-6 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   2.75-5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
H   2.3/4-4           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   2.3/4-4           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
=== 2.3/4(-4) UNC     M69.85x6.35, primary size, 4UN, Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1921/1924/1928/1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), BS 1580:1962
    2.3/4-4 UNC       on crane hooks; minimum size for #16/#16A hook/crane, workload limit 22.4/29.4 tons (Crosby/Bullard)
@   2.75-4 BUTT       buttress thread, 7/45°, ANSI B1.9
H   2.3/4-3.1/2       Whitworth thread proposal, 1841; as 2.750-3.5, 1857
@   2.3/4-3.5 TWC     Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   2.3/4-3.5 BSW     British Whitworth Standard; W69.85x7.257; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
L   2.3/4-3 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
 o  2.754-24          astronomy, Astro Physics telescopes and accessories, female thread (see 2.74-24 for male therad)
@   M70x0.5           DIN 13-3
@   M70x0.75          DIN 13-4
@   M70x1             DIN 13-5
 o  M70x1             lens mount, 105mm Printing Nikkor older model; on some f-theta laser scan systems; some thermal imaging lenses
====M70x1.5           common; ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 1st constant, SI M.ME, ISA E (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M70x1.5           some cable gland ports
====M70x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 1st constant, SI M.MD, ISA D (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
    M70x2             bearing retaining locknut, "KM14", ISO 2982 (1971)
    M70x2             wheel shaft nut
 %  M70x2             seen on some metric heating radiator piping systems
H   W70x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
====M70x3             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 1st constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
 p  70-6              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 69.0mm, depth 1.19mm, bump radius 0.864mm, bump base radius max.0.635mm, bump base width 2.39mm
 p  SP70(-6)          70SP, glass/plastic bottle thread, SP-400; 70-400 on lab containers, widemouth jars; 5-gal plastic jugs, carboys
====M70x4             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 1st constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
@   S70x4             buttress thread, fine, 33°, DIN 514
L   Tr70x4            trapezoidal fine, 30°, DIN 103; for leadscrews
 p  GL70(x5)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  DIN70             S70; plastic variant of GL70; "71" often printed on the cap; 
@   Rd70(-6)          round/knuckle thread, DIN 405
!   70-4              "70G", "G70"; plastic bottle thread, SP-444, 70-444; home canning bottle thread, SP-460, 70-460 (see also 86-460); 70-450 is regular mouth Mason jar; 70-450,70-460,70-470 compatible with 70G for food canning; 70-2030 on 12/16/32 oz mayo jars
====M70x6             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-10, GOST 9150-59 constant, GOST 24705-81
@   Rd70(x6)          round/knuckle thread, DIN 20400
 p  70x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
 p  S70(x6)           DIN 71; plastic container thread; 71, Rieke 70mm often on cap; larger opening on UN-approved plastic barrels (smaller is S56x4)
!p  BSC70x6           Mauser 2", buttress(?), standardized barrel thread; see also BSC56x4
H   70.0x6.6          Armengaud thread, V-thread, 76° (later 55°), historical
H   70x7              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
@   S70x10            buttress thread, coarse, 33°, DIN 513
L   Tr70x10           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
!p  70-1.5x4          glass lug vacuum-seal jar, 4-start; very common canning size; 70-2030, GME 20.06, ISO 9100-8, FD 138S, WGF-138S (regular); 70-2035, GME 20.07, ISO 9100-9, FD 138B, WGF-138B (deep, less common)
 p  70-1.25x10        glass bottle, press-on twist-off finish, 10-start; 70-2220; WGF-148S
 p  70 TN             FD 138D, WGF-138D
====G2.3/8(-11)       G70.968x2.309, W2.794-11; Original Whitworth Pipe Thread (Guide to World Screw Threads)
 o  M71x1             astro telescopes
 p  S71(x6)           DIN 71; plastic container thread, S70 with slightly deeper thread, slightly bigger outside diameter
 h  2.812-16          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley (normally Gurley threads are 18 threads per inch)
 h  2.812-14          antique geodetic/surveying gear, pre-standard, male on tripod; B. L. Makepeace
 h  2.815-14          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
 h  2.820-16          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
 h  2.830-24          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
@   M72x0.5           DIN 13-3
@o  2.8346-36 NS      72.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M72x0.75          DIN 13-4
 o  M72x0.75          lens mount "DALSA P3", flange focal dist. 6.56mm; up to 57.4mm sensors; in machine vision, 1st choice; JIIA image size class V
 o  M72x0.75          lens mount "DALSA P2", flange focal dist. 19.55mm; up to 57.4mm sensors; in machine vision, 1st choice; JIIA image size class V
 o  M72x0.75          lens mount, flange focal dist. 31.8mm; up to 57.4mm sensors; in machine vision, 1st choice; JIIA image size class V
 o  M72x0.75          optical filter, standard size, outer dia usual 75     aperture usual 66.9, most common on mid-range lenses (gold ring), Canon large/mid zooms and few primes; some microscope objectives
 o  M72x0.75          optical filter; on Kalimar 8/500mm lens, LOMO OKS10-28-1
====M72x1             ISO extended, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M72x1             astronomy, focuser drawtubes on larger Takahashi refractors
====M72x1.5           ISO 261 1st, ISO primary fine, SI M.ME, ISA E (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 w  M72x1.5           ordnance fuze; TP-M67P1, for 81/82mm cal. mortar shells
 %  M72x1.5           some cable gland ports
=== M72x2             common; ISO 261 1st, ISO primary fine, electrical conduit DIN 89280, BS 3643-1:1981 1st constant, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-7	, DIN 247 (1st), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M72x2             on oil filters; hydraulic; rare
=== M72x3             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246 (1st), GOST 9150-59 constant, GOST 24705-81
=== M72x4             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
@   Rd72(-6)          round/knuckle thread, DIN 405, secondary size
H   W72x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W72x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   M72x6             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M72(x6)           M72; common; ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
H   W72x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   72x6.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   72x6.5            S.F. No.11, French thread, S.F., System Francais; 60°; historical, before introduction of SI
@   M72x6.5           "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909)
L   Tr72x10           trapezoidal coarse, 30°, DIN 103; for leadscrews, secondary size
 h  2.839-24          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
 h  2.840-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
=== 2.1/2-8NPSH       2.841-8, 2-1/2" NPSH; 72.16x3.175, firehose/hydrant coupling thread, NPSH/IPT 2.5", 2-1/2" NPSH, 2.5 NPSH; ANSI/ASME B1.20.7
 %  2.1/2-8NPSH       firefighting, forestry hose, 2.1/2" hose (USDA 5100-107d specification, but not in common use)
 %  2.1/2-8NPSH       most standard larger firehose in USA; for smaller, see 1-1/2" NPSH
 h  2.850-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
 o  M73x1             astro telescopes
H   W73x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
 p  73-6              glass/plastic bottle thread, SP-444; 73-444; uncommon
=====2.1/2" pipe      2.875 in, 2.7/8", 73.025 mm outer diameter, DN 65, NPS 2 1/2, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 65mm, ASTM copper tube 67mm, NFPA 63.5/64mm, AWWA 63/63.5mm; ASTM B42 copper B43 red brass, wall th 0.187"/4.75mm standard, 0.280"/7.11mm extra strong; ASTM B302 threadless Cu, 0.065"/1.65mm
c   2.7/8-20 UN       20UN, 20-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   2.7/8-18
c   2.7/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 %  2.875-16 UN       conduit fittings, MIL-PRF-24758-2, size H
c   2.7/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, SAE regular, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  2.875-12 UN       shipboard stuffing tube, ASTM F1836, US, size R,T
H   2.7/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   2.7/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
=== NPT 2.1/2(-8)     2.8622-8, ~2.7/8-8, M72.7x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
c   2.7/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
H   2.7/8-4           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   2.7/8-4           V.St'd (Machinists Handbook 1909)
c   2.7/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   2.7/8(-3.5) BSW   British Standard Whitworth; 55°; Whitworth 1857; old standard
@   2.7/8-3.5         USS (Machinists Handbook 1909)
 h  2.880-12          antique geodetic/surveying gear, pre-standard, male on tripod; Wm. Ainsworth and Beckmann
 o  M74x1             astronomy, focuser drawtubes; Sky-Watcher Esprit telescopes, some TS-Optics and Omegon telescopes
====M74x1.5
====M74x2
 %  M74x2             fire extinguishers, water/foam/powder, 50-100 kg; powder, 6-9 kg, 50-100 kg; male on bottle, sleeve nut on valve
====M74x3
====M74x4
 h  2.918-12          antique geodetic/surveying gear, pre-standard, male on tripod; Bausch & Lomb
@   2.929(-16)        BS copper pipe thread, BScopper, 2-3/4" inner dia; W74.40x1.59
====2.933-12 UNS      ABMA #15 locknut, AN-15, M74.5x2.12, ~2.15/16-12
====2.933-11 UNS      ABMA #15 locknut, NE-15, M74.5x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
@   Glasg 74.5(x7.5)  electric lighting fittings, glass lamp covers, DIN 40450; obsolete, still made by few
 h  2.938-12          antique geodetic/surveying gear, pre-standard, male on tripod; Eugene Dietzgen
@   M75x0.5           DIN 13-3
 o  M75x0.7           lens mount, single focus solution with 75mm female thread (HCDNA, FVD-16A)
@   M75x0.75          DIN 13-4
 o  M75x0.75          optical filter
 o  M75x0.75          lens mount, Rapido FVD-16A attachment; female on attachment
@   M75x1             DIN 13-5
 o  M75x1             astronomy, focusers; 3" Feathertouch focusers
=== M75x1.5           common; ISO 261 3rd, ISO tertiary fine, electrical conduit EN 60423, BS 3643-1:1981 3rd constant, SI M.ME, ISA E (1940), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M75x1.5           "E75", electrical conduit
====M75x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, SI M.MD, ISA D (1940), DIN 13-7, DIN 247, GOST 9150-59 constant, GOST 24705-81
    M75x2             bearing retaining locknut, "KM15", ISO 2982 (1971)
====M75x3             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246, GOST 9150-59 constant, GOST 24705-81
====M75x4             ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
@   S75x4             buttress thread, fine, 33°, DIN 514
L   Tr75x4            trapezoidal fine, 30°, DIN 103; for leadscrews
 p  SP75(-6)          75SP, glass/plastic bottle thread, SP-400,444; 75-400, 75-444; uncommon; 75-445 for food canning
@   Rd75(-6)          round/knuckle thread, DIN 405
====M75x6             ISO extended
 p  75x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
@   Rd75(x6)          round/knuckle thread, DIN 20400
H   75.0x7.0          Armengaud thread, V-thread, 76° (later 55°), historical
H   75x7              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
@   S75x10            buttress thread, coarse, 33°, DIN 513
L   Tr75x10           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
 h  2.955-10          antique geodetic/surveying gear, pre-standard, male on tripod; (possible Bausch & Lomb)
@   75.184-11         CTG 70-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
=== G2.1/2(-11)       G75.184x2.309, W2.96-11, W75.184x2.309, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); Whitworth pipe thread (Machinist Handbook 1909, as W3.0013-11)
 %  2.1/2-11 BSPP     on hydraulic pipes with outer dia approx. 3"
====2.96-11           75.18x2.309, firehose/hydrant coupling thread, US standard 2.1/2" hose, British Pipe BSP, less common
H   75.2x8.230        FS -20, Thury thread, Filiere Suisse, FS, 47.5°; Swiss, est.1878, historical; size -20, 2.9606-3.1
 h  2.965-10          antique geodetic/surveying gear, pre-standard, male on tripod; (possible Bausch & Lomb)
 h  2.966-16          antique geodetic/surveying gear, pre-standard, male on tripod; Kolesch & Company
 h  2.970-13          antique geodetic/surveying gear, pre-standard, male on tripod; (possible Bausch & Lomb)
@   M75.5x0.5         Thorlabs SM75
 o  M75.5x0.5         Thorlabs SM75, aperture 71.4mm
 o  M75.5x0.5         some lens mounting rings, eg. Thorlabs
 h  2.975-16          antique geodetic/surveying gear, pre-standard, male on tripod; B. C.Soltmann, NY
 h  2.985-12          antique geodetic/surveying gear, pre-standard, male on tripod; Keuffel & Esser same as below
 %  2.990-8           75.94x3.175, firehose/hydrant coupling thread, standard 2.1/2" hose; Canada, AMA - Alberta Mutual Aid, BA (BAT), compatible with BCT
 %  2.990-7.5         firehose/hydrant coupling thread, US standard 2.1/2" hose; Chicago Fire Dept. Thread (do not confuse with Chicago Hose Thread standard)
@   M76x0.75          DIN 13-4
 o  M76x0.75          optical filter; on eg. LOMO Lenar zoom lens, Industar-37 lenses (M80x0.75 mount)
====M76x1             DIN 13-5, GOST 9150-59 constant, GOST 24705-81
=== M76x1.5           ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.ME, ISA E (1940), SI fine (1971), DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
    M76x1.5           on water flow meter capsules; MB3, Minol MB3
=== M76x2             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MD, ISA D (1940), SI fine (1971), DIN 13-7, DIN 247 (2st), GOST 9150-59 constant, GOST 24705-81
H   W76x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
=== M76x3             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, SI M.MC, ISA C (1940), DIN 13-8, DIN 246 (2st), GOST 9150-59 constant, GOST 24705-81
=== M76x4             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, SI M.MB, ISA B (1940), DIN 13-9, DIN 245, GOST 9150-59 constant, GOST 24705-81
H   W76x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W76x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
=== M76x6             ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, SI M.MA, ISA A (1940), SI (1971), DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
H   W76x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   76x6.5            S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
@   M76x6.5           "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909)
 p  76 TN             MVG7995, WGF-176T
===== 76.1mm Cu tube  76.1mm outer-dia tube; EN 1057, wall th 1.5(X),2.0(Y)mm; BS 2871 (76.2mm/3" outer dia), table X (wall th 1.5mm, 2.4 MPa), Y (2mm, 2.5 MPa), Z (1.2mm, 1.9 MPa); copper pipe in Europe, usually 2mm wall thickness
*   3" copper         ...see 3.203-16, W81.36x1.59
*   3" BSP            ...see W3.46-11, W87.884x2.309, G3", BSP pipe thread
*   3" NPT            ...see 3.1/2-8, M88.90x3.175
*   3" NPSH           ...see 3.470-8; hose thread
===== 3" Cu tube      DN80, 76.20mm outer-diameter tube; AS 1432 wall thick 2.03mm/14g (A/green, 1.90 MPa), 1.63mm/16g (B/blue, 1.52MPa), 1.22mm/18g (D/black, 1.13 MPa); AS/NZS 1571, wall thick 1.63mm (1.61 MPa); ASTM A270 sanitary stainless, 0.065"/1.65mm
 o  3-28 UNS          lens mount, unusual, flange focal dist. 10.7/11.2/11.89mm; up to 57.4mm sensors; in machine vision; JIIA image size class V
 o  3-24 Whitw.       British camera lens flange fittings, R.P.S. standard
@   3-24 UNS
 o  3-24 UNS          lens mount, US standard series, male on lens, PH3.10
====3-20 UN           20UN, 20-thread, primary size, constant pitch series, UN (H28 1963)
@   3-18 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  3.000-18          antique geodetic/surveying gear, pre-standard, male on tripod
@   76.20-16          CTC 75-16, thin steel conduit thread, 80°; Japanese, JIS C 8305
====3-16 UN           16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 C  3-16 UN           circular connectors, MIL-DTL-5015; size 48, coupling (J) and accessory (H)
 %  3.000-16 UN       conduit-to-panel fittings, MIL-PRF-24758-5, size H
 h  3.000-16          antique geodetic/surveying gear, pre-standard, male on tripod
@   3-16 BUTT         buttress thread, 7/45°, ANSI B1.9
*   3-16 copper       ...see 3.203-16, W81.36x1.59
@   ET3               W3-14, B.S. electrical conduit thread, BS Con, BS 949, BS 31, Whitworth, 55°
@   3-14 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
====3-12 UN           12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1928/1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  3-12              JIC tube fittings
 %  3.000-12 UN       shipboard stuffing tube, ASTM F1836, US, size S,V
 w  3.000-12          some newer large-caliber mortar fuzes (US, is it 2"? typo in source?)
 h  3.000-12          antique geodetic/surveying gear, pre-standard, male on tripod; Keuffel & Esser
@   3-12 BUTT         buttress thread, 7/45°, ANSI B1.9
 %  3-11              tube coupling, JIS 300, tapered, or 30-deg male flare on male
*   G3-11             ...see W3.46-11, W87.884x2.309, BSP pipe thread
@   3-10 UNS          SAE regular (1915/1926), ANF (NSTC 1921), UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  3.000-10          antique geodetic/surveying gear, pre-standard, male on tripod; Keuffel & Esser
@   3-10 BUTT         buttress thread, 7/45°, ANSI B1.9
*   3-8 NPT           ...see 3.1/2-8, M88.90x3.175
*   3-8 NPSH          ...see 3.470-8; hose thread
H   3(-8) ADMF        Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====3-8 UN            8UN, 8-thread, primary size, constant pitch series, 8AN, ANF (NSTC 1928), AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 %  3.00-8            76.20x3.175, firehose/hydrant coupling thread, Canadian standard 2.1/2 hose, BCT, British Columbia
 %  3.00-8            76.20x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, New York Corp NYC
 %  3.00-8            76.20x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, Toledo, OH
 %  3-8               firehose/hydrant coupling thread, 2.1/2" hose, "Durham Hose", "New York Corporation thread"
 %  3-8               on oil filters; hydraulic; rare
 w  3-8               Japanese WW2 bomb fuzes (Whitworth?); Type 15 Tail Fuze Model 2 and Model 1, B-3(b)
@   3-8 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
 %  3.00-7.5          76.20x3.387, firehose/hydrant coupling thread, US standard 2.1/2" hose, Chicago Fire Dept CFD
====3-6 UN            6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   3-6 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   3(-5) BSF         British Whitworth Fine-pitch; 55°; BS 84-1956; in British Standards Interim Report 7270-1919
@   3-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
=== 3(-4) UNC         M76.20x6.35, primary size, 4UN, ANC (NSTC 1921/1924/1933, H28 1942/1944), ANC (NSTC 1928 - optional to 3-3.5, standard for marine work), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), BS 1580:1962
L   3-4 ACME          for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
@   3-4 BUTT          buttress thread, 7/45°, ANSI B1.9
H   3-3.1/2           Whitworth thread proposal, 1841; as 3.000-3.5, 1857
@   3-3.5 TWC         Truncated Whitworth Coarse; US WW2 wartime standard; flat root/crest, 55°, compatible with BSW; H28 1944
@   3-3.5 BSW         British Whitworth Standard; W76.20x7.26; 55°; also "continental Whitworth"; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   3"-3.5            sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   3-3.5             Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   3-3.5             Sellers (1864), USS (Machinists Handbook 1909), V.St'd (Machinists Handbook 1909), ANC (NSTC 1928, see also 3-4)
    3-3.5             in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
L   3-3 ACME          for leadscrews, Acme trapezoidal thread, angle 29-deg; uncommon
L   3"-2 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C; BS 1104:1957, class 2G/3G/4G/5G
    3-2x2             wooden thread, double-start, encountered on threaded rod of a vise bench, 60°; Lake Erie Toolworks 2x wood vise screw
 h  3.015-16          antique geodetic/surveying gear, pre-standard, male on tripod; Kolesch & Company
 %  3.030-8           76.96x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, New York City FD FDNY, "New York Fire Dept. Thread"
 %  3.030-7.5         76.96x3.387, firehose/hydrant coupling thread, US standard 2.1/2" hose, Pacific Coast PCT
 %  3.031-7           76.96x3.629, firehose/hydrant coupling thread, Canadian standard 2.1/2 hose, QMT, Quebec-Montreal Combination
 %  3.031-7           76.96x3.629, firehose/hydrant coupling thread, Canadian standard 2.1/2 hose, QST, Province of Quebec Standard
@o  3.0315-36 NS      77.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
!o  M77x0.75          optical filter, standard size, outer dia usual 80     aperture usual 71.9, most common on high-end lenses (red ring), Canon most common on larger L-series lenses, on some C/CS-mount lenses
 o  M77x0.75          optical filter; on Kiev-16U lenses
 o  M77x1             optical filter, on some C/CS-mount lenses, astro telescopes
    M77x1.5           on water flow meter capsules; A34, Allmess (UP)
 p  SP77(-6)          77SP, glass/plastic bottle thread, SP-400
 p  77-5              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 76.6mm, depth 1.52mm, bump radius 1.118mm, bump base radius max.0.762mm, bump base width 3.05mm
 p  77-1.5x4          glass lug vacuum-seal jar, 4-start; 77-2030; (4 lugs are non-ISO)
 p  77-1.25x6         glass lug vacuum-seal jar, 6-start; 77-2040, GME 20.08, ISO 9100-10, FD 138E, WGF 138E (regular)
@   3.035-40          M77.09x0.635, Thorlabs SM3
 o  3.035"-40         77.09x0.635, Thorlabs SM3, aperture 71.4mm
 %  3.035-7.5         firehose/hydrant coupling thread, US standard 2.1/2" hose; Pacific Coast Thread
 %  3.04-7            77.22x3.629, firehose/hydrant coupling thread, US standard 2.1/2" hose, Chicago Hose
 o  M77.5-24          lens mount, Aero Ektar lenses
 o  M77.5x1           astro telescopes
 %  3.06-8            77.72x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, Buffalo, NY
 %  3.06-6            77.72x4.233, firehose/hydrant coupling thread, US standard 2.1/2" hose, Cincinnati, OH (new)
 %  3.06-6            77.72x4.233, firehose/hydrant coupling thread, US standard 2.1/2" hose, Phoenix, AZ (old)
 %  3.06-6            77.72x4.233, firehose/hydrant coupling thread, US standard 2.1/2" hose, Pittsburg, PA
 %  3.1/16-8          firehose/hydrant coupling thread, 2.1/2" hose; Goldsboro Hose, Fayetteville Hose, Wilson Hose
=== 2.1/2-7.5 NH      3.068-7.5, 2.5-7.5 NH, 3.1/16-7.5, 77.93x3.387, firehose/hydrant coupling thread, US standard 2.1/2" hose, NH/NST 2.5"; NSTC 1924/1928/1933, H28 1942/1944 (American National Fire-hose Coupling), NFPA 1963
 %  2.5-7.5 NH        firefighting; on US fire hydrants; attack port with 2.5-7.5 NH threads (two ports per hydrant; NFPA 1963 requirement); also 4.5-4 NH port
 %  2.1/2-7.5 NH      firefighting, forestry hose, 2.1/2" hose (USDA 5100-107d specification and NFPA 1963 requirement)
 %  2.1/2-7.5 NH      firefighting, attack hose, 2.1/2" hose (NFPA 1963 requirement), 3" hose (NFPA 1963 requirement)
 %  2.1/2-7.5 NH      firefighting, suction hose; secondary suction port on most fire engines, when the volume provided by a larger diameter hose is not needed but the flexibility of a smaller hose is
 %  3.07-8            77.98x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, Cleveland, OH
 %  3.07-8            77.98x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, Omaha, NE
@   M78x0.5           DIN 13-3
@   M78x0.75          DIN 13-4
@   M78x1             DIN 13-5
 o  M78x1             some lens mounting rings, eg. in laser optics
====M78x1.5           DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
    M78x1.5           on water flow meter capsules; WE1, Wehrle
====M78x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-7, DIN 247, SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M78x3             DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
 %  M78x3             on some gastronomy equipment valves, male on valve; also M68x3, M60x2
====M78x4             DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   Rd78(-6)          round/knuckle thread, DIN 405, secondary size
 %  3.09-8            78.49x3.175, firehose/hydrant coupling thread, US standard 2.1/2" hose, Denver, CO
 o  M78.5x1           lens mount, laser galvo F-Theta scan lens, eg. Nd:YAG engraver lasers; uncommon
 h  3.100-12          antique geodetic/surveying gear, pre-standard, male on tripod; (possible Bausch & Lomb)
===== 79mm Cu tube    79mm outer-dia tube; ASTM B88M type A/2.8mm, B/2.3mm, C/1.8mm
 o  M79x1             lens mount, laser galvo F-Theta scan lens, eg. Nd:YAG engraver lasers; less common than M85x1
 %  3.12-7.5          79.25x3.387, firehose/hydrant coupling thread, US standard 2.1/2" hose, Detroit, MI
 %  3.12-5            79.25x5.080, firehose/hydrant coupling thread, Canadian standard 2.1/2 hose, CSA, Canadian Standards Assoc.
====G2.5/8(-11)       G79.350x2.309, W3.124-11; Original Whitworth Pipe Thread (Guide to World Screw Threads)
===== 3" Cu pipe      3" 76.20mm nominal bore, 3.1/8" 79.375mm outer diameter pipe; ASTM B88 type K/0.109"/2.77mm, L/0.090"/2.29mm, M/0.072"/1.83mm; ASTM 306 copper, 0.045"/1.14mm; plumbing copper pipe in USA/Canada
c   3.1/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 h  3.125-14          antique geodetic/surveying gear, pre-standard, male on tripod
c   3.1/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  3.125-12 UN       shipboard stuffing tube, ASTM F1836, US, size W
 h  3.125-12          antique geodetic/surveying gear, pre-standard, male on tripod; Bausch & Lomb
 g  3.1/8-11 UN (UNS?) safety caps/neck rings on pressurized gas cylinders, UN fine thread, high pressure
@   3.1/8-10          SAE regular
H   3.1/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   3.1/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 g  3.1/8-7 UN        safety caps/neck rings on pressurized gas cylinders, UN coarse thread, high-pressure
c   3.1/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   3.1/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   3.1/8(-3.5) BSW   British Standard Whitworth; 55°; old standard
H   3.1/8-3.5         sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   3.1/8-3.5         USS
====3.137-12 UNS      ABMA #16 locknut, AN-16, M79.68x2.12
====3.137-11 UNS      ABMA #16 locknut, NE-16, M79.68x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
 h  3.143-14          antique geodetic/surveying gear, pre-standard, female on tripod; Aloe
@   M80x0.5           DIN 13-3
@   M80x0.75          DIN 13-4
 o  M80x0.75          lens mount, some Russian Tessar lenses, large-format Industar, Industar 37 (with M76x0.75 filter); wooden FKD 18X24 Russian camera
====M80x1             ISO extended, DIN 13-5, GOST 9150-59 constant, GOST 24705-81
 o  M80x1             lens mount, on some astronomy telescopes, on some 3" focusers; some MWIR camera lenses, common with back flange dist. 52.245mm
=== M80x1.5           common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, SI M.ME, ISA E (1940), SI fine (1971), ANSI/ASME B1.13M fine, DIN 13-6, DIN 516, GOST 9150-59 constant, GOST 24705-81
 %  M80x1.5           some cable gland ports
    M80x1.5           on water flow meter capsules; MB2, Minol MB2
    M80x1.5           some industrial swing clamps
=== M80x2             common; ISO 261 1st, ISO primary fine, electrical conduit DIN 89280, BS 3643-1:1981 1st constant, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M80x2             "E80"?, electrical conduit
    M80x2             bearing retaining locknut, "KM16", ISO 2982 (1971)
@   PG80              W80-12; gas bottle neck thread, for safety caps(?); tapered, Whitworth; GB 8335:2011 (China)
 g  W80-11            safety caps/neck rings on pressurized gas cylinders, Whitworth, high pressure; DIN 477
H   W80x1/10" LON     Whitworth Fine Thread DIN LON 286, 55°, constant pitch, historical; used in locomotive construction until about 1975
=== M80x3             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
 g  M80x3             gas bottle neck thread, for safety caps(?); GB 8335:2011 (China)
=== M80x4             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S80x4             buttress thread, fine, 33°, DIN 514
L   Tr80x4            trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd80(-6)          round/knuckle thread, DIN 405
 p  80x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
H   W80x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W80x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
 p  GL80(x5)          GL-80,GLS-80; on glass containers, knuckle thread DIN 168; 60° internal, 30° external; established wide-mouth lab containers
 p  GLS80(x5.5x3)     DIN 168-1, short; typical lab bottle with wide neck, short thread with 3 ends
H   M80x6             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M80(x6)           M80; common; ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, SI M.MA, ISA A (1940), SI (1971), ANSI/ASME B1.13M coarse, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   Rd80(x6)          round/knuckle thread, DIN 20400
@   DN80(-4)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
 %  DN80              common on various hoses, couplings exist to G3"; also DN20, DN100
H   W80x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   80x7              Ducommun Steinle thread, 60°, historical; established in 1873; for mechanical and optical instruments
H   80x7              S.J. thread, 60°, historical; standardized in 1898, precursor of metric ISO thread
H   80x7              S.F. No.12, French thread, S.F., System Francais; 60°; historical, before introduction of SI
@   M80x7             "French metric" (Machinists Handbook 1909), International (Zurych 1898, Machinist Handbook 1909)
H   80.0x7.4          Armengaud thread, V-thread, 76° (later 55°), historical
@   S80x10            buttress thread, coarse, 33°, DIN 513
L   Tr80x10           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 h  3.156-14          antique geodetic/surveying gear, pre-standard, male on tripod
 h  3.160-16          antique geodetic/surveying gear, pre-standard, male on tripod; Warren-Knight
 h  3.165-14          antique geodetic/surveying gear, pre-standard, male on tripod
 h  3.170-10          antique geodetic/surveying gear, pre-standard, male on tripod; J. H. Temple
 h  3.187-14          antique geodetic/surveying gear, pre-standard, male on tripod; Warren Knight
@   3.3/16-12
 o  M81x0.75          optical filter; on Philips SK 100mm F/1.5 projection lens
=== G2.3/4(-11)       G81.534x2.309, W3.21-11, W81.534x2.309, 2.3/4 BSPP, parallel, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); Whitworth pipe thread (Machinist Handbook 1909, as W3.247-11); less common size; not used for British Standard Taper Pipe but in BS 2779 (Fastening Threads of BSP sizes)
@   3.203(-16)        BS copper pipe thread, BScopper, 3" inner dia; W81.36x1.59
 %  3.7/32-8          firehose/hydrant coupling thread, 2.1/2" hose; Henderson Hose
@   M82x0.5           DIN 13-3
@o  3.2283-36 NS      82.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M82x0.75          DIN 13-4
 o  M82x0.75          optical filter, standard size, outer dia usual 85     aperture usual 76.8, common-ish, some Sigma lenses, common on pro TV cameras
 o  M82x0.75          optical filter; on lenses with OCT-19 mount in Konvas housing that fit are: EKRAN 35OKS7-18-1, LOMO OKS5-18-1
 o  M82x0.75          optical filter, on Swarowski ATS80/ATM80 spotting scope, female on lens
@   M82x1             DIN 13-5
====M82x1.5           DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M82x2             ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-7, DIN 247, SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M82x3             DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M82x4             DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   Rd82(-6)          round/knuckle thread, DIN 405, secondary size
 p  82x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm (for honeyjars only)
 p  82-1.25x6         glass lug vacuum-seal jar, 6-start, common; 82-2040, GME 20.09, ISO 9100-11, FD 130, WGF-130S (regular); 82-2045 (deep finish, less common)
 %  3.23-5            82.04x5.080, firehose/hydrant coupling thread, Canadian standard 2.1/2 hose, NOVA, Nova Scotia zone 1
*   3.1/4" BSPT       ...see W3.7-11, W93.98x2.309, tapered, high pressure copper
@   3.1/4-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====3.1/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 o  3.25-16           M82.55x1.59; astronomy, on telescopes; "large SCT thread" (also 3.28-16 for Celestron); Meade SCTs of 12" and greater aperture; see 2-24 for "small SCT thread"
@   3.1/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====3.1/4-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  3.250-12 UN       shipboard stuffing tube, ASTM F1836, US, size X
*   3.1/4-11 BSPT     ...see W3.7-11, W93.98x2.309, tapered, high pressure copper
@   3.1/4-10 UNS      SAE regular, UNS (H28 1963), ASME B1.1-2003 Appendix D
H   3.1/4(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====3.1/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====3.1/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
 %  3.25-6            82.55x4.233, firehose/hydrant coupling thread, Canadian standard 2.1/2 hose, WCT, Western Canada Fire Under
 %  3.25-6            82.55x4.233, firehose/hydrant coupling thread, US standard 2.1/2" hose, Salt Lake City, UT
 g  3.1/4-6 ACME      LPG/propane/butane, other gases (NH3,...) connection; also 1.3/4-6 ACME, 2.1/4-6 ACME
@   3.1/4(-5) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956
=== 3.1/4(-4) UNC     M82.55x6.35, primary size, 4UN, ANC (NSTC 1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), BS 1580:1962
H   3.1/4-3.5         sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   3.1/4-3.5         Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   3.1/4-3.5         Sellers (1864), USS (Machinists Handbook 1909)
    3.1/4-3.5         in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
H   3.1/4-3.1/4       Whitworth thread proposal, 1841; as 3.250-3.25, 1857
@   3.1/4(-3.25) BSW  British Standard Whitworth; 55°; BS 84-1956 (secondary size, avoid if possible); Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
 o  M83x0.75          optical filter, less common
 p  83-5              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 82.5mm, depth 1.52mm, bump radius 1.118mm, bump base radius max.0.762mm, bump base width 3.05mm
 p  SP83(-5)          83SP, glass/plastic bottle thread, SP-400,444; 83-400 on lab containers, widemouth jars; 83-445 for food canning
 o  3.28-16           astronomy, on telescopes; "large SCT thread" (also 3.28-16 for Celestron); Meade SCTs of 12" and greater aperture; see 2-24 for "small SCT thread"
 o  3.29-16           M83.31x1.59; astronomy, on telescopes; "large SCT thread" (also 3.25-16 for Meade); Celestron SCTs 11" and greater, rear cell and for accessories; see 2-24 for "small SCT thread"
 o  3.3"-16           on astronomy telescopes, adaptor at focuser; Celestron C11/C14; lens mount, Celestron astro telescope (83.8x1.59)
 o  M84x1             astronomy, focusers on telescopes; on large Pentax refractors
H   W84x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W84x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
====M84x6             SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W84x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
 h  3.312-12          antique geodetic/surveying gear, pre-standard, male on tripod; Buff & Berger, Buff & Buff  and C.L. Berger & Sons
@   Glasg 84.5(x7.5)  electric lighting fittings, glass lamp covers, DIN 40450; obsolete, still made by few
 %  3.328-6           84.53x4.23, 3.21/64-6; firehose/hydrant coupling thread, 2.1/2" hose; "Raleigh thread"
 h  3.350-12          antique geodetic/surveying gear, pre-standard, male on tripod; T. Cooke & Sons
====3.340-12 UNS      ABMA #17 locknut, AN-17, M84.84x2.12
====3.340-11 UNS      ABMA #17 locknut, NE-17, M84.84x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
 %  3.340-6 Sharpe V  84.84x4.23; firehose/hydrant coupling thread, 2.1/2" hose; "Siamese Raleigh", Raleigh City, other specs
@   M85x0.5           DIN 13-3
@   M85x0.75          DIN 13-4
@   M85x1             DIN 13-5
 o  M85x1             lens mount, laser galvo F-Theta scan lens, eg. Nd:YAG engraver lasers; by far most common size
 o  M85x1             optical filter; on Salvo scanners, lenses with OCT-19 mount in Konvas housing that fit are: OKS7-28-1, OKS8-35-1, OKS1-50-1, OKS6-75-1
=== M85x1.5           ISO secondary fine, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
 %  M85x1.5           some cable gland ports
=== M85x2             common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M85x2             "E85", electrical conduit
    M85x2             bearing retaining locknut, "KM17", ISO 2982 (1971)
=== M85x3             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
=== M85x4             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   M85x16(P4)        gas bottle neck thread, for safety caps(?); cylindrical, 60°, 4-start, 4mm pitch; GB 8335:2011 (China)
@   S85x4             buttress thread, fine, 33°, DIN 514
L   Tr85x4            trapezoidal fine, 30°, DIN 103; for leadscrews
=== M85x6             ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
    M85x6             firehose coupling, Italian, UNI 70
@   Rd85(-6)          round/knuckle thread, DIN 405
@   Rd85(x6)          round/knuckle thread, DIN 20400
 p  85x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
@   S85x12            buttress thread, coarse, 33°, DIN 513
L   Tr85x12           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
====G2.7/8(-11)       G85.522x2.309, W3.367-11; Original Whitworth Pipe Thread (Guide to World Screw Threads)
c   3.3/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 %  3.375-16 UN       conduit fittings, MIL-PRF-24758-2, size L
 h  3.375-14          antique geodetic/surveying gear, pre-standard, male on tripod
 S  3.375-12 Whitw.   antique geodetic/surveying, tripod mount, "India Office Pattern thread", old British standard for theodolites, flash spotting instruments, gun directors... on tripod stands No.39; origin before 1915
c   3.3/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  3.375-12 UN       shipboard stuffing tube, ASTM F1836, US, size Y
 h  3.375-12          antique geodetic/surveying gear, pre-standard, male on tripod; Eugene Dietzgen
 h  3.375-11          antique geodetic/surveying gear, pre-standard, male on tripod; C.L. Berger & Sons (normally Berger is  3.312-12)
@   3.3/8-10          SAE regular
H   3.3/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   3.3/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
c   3.3/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   3.3/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   3.3/8(-3.25) BSW  British Standard Whitworth; 55°; old standard
H   3.3/8-3.25        sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   3.3/8-3.25        USS
 o  M86x0.75          "86M", optical filter, standard size; on some LOMO lenses with OCT-19 mount in Konvas housing - OKS1-50-6, OKS6-75-1
 o  M86x1.0           "86C", optical filter, outer dia usual 89     aperture usual 80.8 (B+W), on some C/CS-mount lenses
====M86x1.5
====M86x2
====M86x3
====M86x4
 p  86-4              home canning bottle thread, widemouth canning containers, SP-460, 86-460 (see also 70-460) for food canning; 86-460 is widemouth Mason jar
@o  3.4252-36 NS      87.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@o  3.4252-36 NS      87x0.706, retaining rings, PH3.17 "IX", Photographic Filter Series, US standard
 o  M87x0.75          optical filters, nonstandard; on Swarowski ATX85/BTX85 spotting scope, female on lens
 o  M87x0.75          astro telescopes
 %  M87x2.5           on oil filters; hydraulic; rare
 o  M87.5x1           lens mount, laser galvo F-Theta scan lens, eg. Nd:YAG engraver lasers; less common than M85x1
@   3.453(-16)        BS copper pipe thread, BScopper, 3.1/2" inner dia; W87.71x1.59
 h  3.460-14          antique geodetic/surveying gear, pre-standard, male on tripod
@   87.884-11         CTG 82-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
=== G3(-11)           G87.884x2.309, W3.46-11, W87.884x2.309, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); Whitworth pipe thread (Machinist Handbook 1909, as W3.485-11)
 %  3-11 BSPP         on hydraulic pipes with outer dia approx. 3.1/2"
    G3                on water flow meter capsules; Patronenzahler (cartridge meter)
 h  3.460-10          antique geodetic/surveying gear, pre-standard, male on tripod
@   M88x0.5           DIN 13-3
@   M88x0.75          DIN 13-4
 o  M88x0.75          optical filter, female on lens, nonstandard; old Soviet "Arsenal" lenses, filters
@   M88x1             DIN 13-5
 o  M88x1             optical filter, female on lens, nonstandard; also on some astro telescopes
====M88x1.5           DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M88x2             DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M88x3             DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M88x4             DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   Rd88(-6)          round/knuckle thread, DIN 405, secondary size
H   88x7.5            S.F. No.13, French thread, S.F., System Francais; 60°; historical, before introduction of SI
@   M88x7.5           International (Zurych 1898, Machinist Handbook 1909)
 p  B83(-2)           88x12.7; 83B, spec B 83; plastic, buttress "typ 2", high collar; "Nalgene B83"; Nalgene; see also B53
====3-8NPSH           3.470-8, 3" NPSH, 88.14x3.175, firehose/hydrant coupling thread, NPSH/IPT 3"; ANSI/ASME B1.20.7
 %  3-8NPSH           firefighting, attack hose, 3" hose.
 h  3.478-12          antique geodetic/surveying gear, pre-standard, male on tripod; Queen & Company
===== 3" pipe         3.500 in, 3.1/2", 88.9 mm outer diameter, DN 80, NPS 3, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 80mm, ASTM copper tube 79mm, NFPA 76/80mm, AWWA 75mm; ASTM B42 copper B43 red brass, wall th 0.219"/5.56mm standard, 0.304"/7.72mm extra strong; ASTM B302 threadless Cu, 0.083"/2.11mm
===== 3.1/2" Cu tube  DN90, 88.90mm outer-diameter tube; AS 1432 wall thick 2.03mm/14g (A/green, 1.63 MPa), 1.63mm/16g (B/blue, 1.30MPa), 1.22mm/18g (D/black, 0.97 MPa)
===== 88.9mm Cu tube  88.9mm outer-dia tube; EN 1057, wall th 2.0mm
*   3.1/2" BSPT       ...see W3.950-11, W100.33x2.309, tapered
*   3.1/2" NPT        ...see 4-8, M101.6x3.175
*   3-1/2 NPSH        ...see 3.970-8; hose thread
@   3.1/2-24 UNS
 o  3.5-24 UNS        lens mount, unusual, flange focal dist. 11.6mm; up to 57.4mm sensors; in machine vision; JIIA image size class V
 o  3.1/2-24 UNS      lens mount, US standard series, male on lens, PH3.10
@   3.1/2-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====3.1/2-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 %  3.500-16 UN       conduit-to-panel fittings, MIL-PRF-24758-5, size L
@   3.5-16 BUTT       buttress thread, 7/45°, ANSI B1.9
@   3.1/2-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 o  3.5-12 Whitw.     British camera lens flange fittings, R.P.S. standard
====3.1/2-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
@   3.5-12 BUTT       buttress thread, 7/45°, ANSI B1.9
 g  3.1/2-11 UN       safety caps/neck rings on pressurized gas cylinders, "fine thread", low pressure
*   3.1/2-11 BSPT     ...see W3.950-11, W100.33x2.309, tapered, high pressure copper
@   3.1/2-10 UNS      SAE regular (1915/1926), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   3.5-10 BUTT       buttress thread, 7/45°, ANSI B1.9
*   3.1/2-8 NPT       ...see 4-8, M101.6x3.175
*   3.1/2-8 NPSH      ...see 3.970-8; hose thread
 g  3.1/2-8 UN        safety caps/neck rings on pressurized gas cylinders, UN coarse thread, low pressure
H   3.1/2(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====3.1/2-8 UN        8UN, 8-thread, primary size, constant pitch series, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
 S  3.1/2-8           surveying instruments mounting thread, US theodolites, from 1927, recommended as standard by the US Bureau of Standards in 1930; male on tripod head; see also 1"-14 AN
=== NPT 3(-8)         3.4885-8, ~3.1/2-8, M88.608x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909)
 S  3" MPT            pipes for survey/geodetic GPS antenna masts; 5/8-11 adapters common
@   3.5-8 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
====3.1/2-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   3.5-6 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   3.5-5 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   3.1/2(-4.5) BSF   British Whitworth Fine-pitch; 55°; BS 84-1956
=== 3.1/2(-4) UNC     M88.90x6.35, primary size, 4UN, ANC (NSTC 1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), BS 1580:1962
@   3.5-4 BUTT        buttress thread, 7/45°, ANSI B1.9
@   3.1/2-3.5
    3.1/2-3.5         in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
H   3.1/2-3.1/4       Whitworth thread proposal, 1841; as 3.500-3.25, 1857
@   3.1/2(-3.25) BSW  British Standard Whitworth; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   3.1/2-3.25        sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   3.1/2-3.25        Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   3.1/2-3.25        Sellers (1864), USS (Machinists Handbook 1909)
L   3.1/2-2 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size, class 2G/3G/4G/2C/3C/4C/5C/6C
===== 89mm pipe       89mm outer-diameter pipe, copper pipe in Europe; usually 2mm wall thickness
 o  M89x1             astro telescopes
 o  M89x1             lens mount, laser galvo F-Theta scan lens, eg. Nd:YAG engraver lasers; less common than M85x1
 p  89-1x6            glass lug vacuum-seal jar, 6-start, less common; 89-2040, 89-2050; GME 20.10, ISO 9100-12, FD 122, WGF-122S (regular)
 p  89-5              glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 88.7mm, depth 1.52mm, bump radius 1.118mm, bump base radius max.0.762mm, bump base width 3.05mm
 p  SP89(-5)          89SP, glass/plastic bottle thread, SP-400; 89-400 on lab containers, widemouth jars, also in metal
====M89x6             SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W89x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W89x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W89x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
 g  Tr89x8            on EIGA couplers for cryogenic gases, male port, mates to Tr90x8
 p  83B               89-2, 89x12.7; 83B, B 83; containers Nalgene, Kautex, Foxx, Carboy 80mm
====3.527-12 UNS      ABMA #18 locknut, AN-18, M89.59x2.12
====3.527-11 UNS      ABMA #18 locknut, NE-18, M89.59x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
 h  3.532-12          antique geodetic/surveying gear, pre-standard, male on tripod
@   M90x0.5           DIN 13-3
@   M90x0.75          DIN 13-4
 o  M90x0.75          optical filter, nonstandard, unusual
@   M90x1             DIN 13-5
 o  M90x1             lens mount, "M90", astro telescope; visual back, on smaller GSO RC telescopes, Celestron 80ED and 100ED scopes (discontinued versions)
====M90x1.5           ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
 %  M90x1.5           some cable gland ports
=== M90x2             common; ISO 261 1st, ISO primary fine, electrical conduit EN 60423, BS 3643-1:1981 1st constant, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M90x2             electrical conduit
 %  M90x2             on oil filters; hydraulic, lube; rare-ish
    M90x2             bearing retaining locknut, "KM18", ISO 2982 (1971)
=== M90x3             ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
=== M90x4             ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S90x4             buttress thread, fine, 33°, DIN 514
L   Tr90x4            trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd90(-6)          round/knuckle thread, DIN 405
 p  GL90(x5)          on glass containers, knuckle thread DIN 168; 60° internal, 30° external
H   M90x6             US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M90(x6)           M90; common; ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), "French Metric", ANSI/ASME B1.13M coarse, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
 p  90x6              German bottle closure thread series; depth 2.04mm, crest radius 1.60mm, root radius 1.20mm
 p  S90(x6?)          plastic container thread; "D90" often on the cap
@   DN90(-4)          round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
@   Rd90(x8)          round/knuckle thread, DIN 20400
 g  Tr90x8            on EIGA couplers for cryogenic gases, female nut, mates to Tr89x8
@   S90x12            buttress thread, coarse, 33°, DIN 513
L   Tr90x12           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 %  3.563-12 UN       shipboard stuffing tube, ASTM F1836, US, size Z
 h  3.584-24          antique geodetic/surveying gear, pre-standard, male on tripod; William E. Stieren of Pittsburg, PA
@o  3.6220-36 NS      92.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
@   M92x0.75          DIN 13-4
@   M92x1             DIN 13-5
 o  M92x1             lens mount, some astronomy telescopes, female on telescope; Meade, Altair, TS, Orion 3" 1x Field Flattener
 o  M92x1             lens mount, laser galvo F-Theta scan lens
====M92x1.5           DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M92x2             DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
 %  M92x2             on oil filters; lube; rare
 %  M92x2.5           on oil filters; lube; rare
====M92x3             DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M92x4             DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   Rd92(-6)          round/knuckle thread, DIN 405, secondary size
====3-6 NH            3.623-6, 92.02x4.233, firehose/hydrant coupling thread, NH/NST 3"; NSTC 1924/1928/1933, H28 1942/1944 (American National Fire-hose Coupling), NFPA 1963
 %  3-6 NH            firefighting, attack hose, 3" hose (not commonly used in the U.S.)
===== 3.1/2" Cu pipe  3.5" 88.90mm nominal bore, 3.5/8" 92.075mm outer diameter pipe; ASTM B88 type K/0.120"/3.05mm, L/0.100"/2.54mm, M/0.083"/2.11mm; plumbing copper pipe in USA/Canada
 h  3.625-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
c   3.5/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
c   3.5/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 h  3.625-12          antique geodetic/surveying gear, pre-standard, male on tripod; Keuffel & Esser
H   3.5/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
@   3.5/8-10          SAE regular
c   3.5/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
c   3.5/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   3.5/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   3.5/8(-3.25) BSW  British Standard Whitworth; 55°; old standard
H   3.5/8-3.25        sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   3.5/8-3.25        USS
 h  3.640-12          antique geodetic/surveying gear, pre-standard, male on tripod; Keuffel & Esser
 o  M93x1             optical filter, female on lens, nonstandard; also on some astro telescopes, camera attachment, female on telescope
 h  3.687-12          antique geodetic/surveying gear, pre-standard, male on tripod; Eugene Dietzgen
====G3.1/4(-11)       G93.930x2.309, W3.6985-11; Whitworth pipe thread (Machinist Handbook 1909); Original Whitworth Pipe Thread (Guide to World Screw Threads)
 o  M94x1             "94C", optical filter
H   W94x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W94x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
====M94x6             SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W94x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
 h  3.720-12          antique geodetic/surveying gear, pre-standard, male on tripod
@   3.727(-16)        BS copper pipe thread, BScopper, 3.1/2" inner dia; W94.67x1.59
====3.730-12 UNS      ABMA #19 locknut, AN-19, M94.74x2.12
====3.730-11 UNS      ABMA #19 locknut, NE-19, M94.89x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
@   M95x0.75          DIN 13-4
 o  M95x0.75          optical filter, standard size, older pitch (beware); on Iscorama 54 lens
@   M95x1             DIN 13-5
 o  M95x1.0           "95C", optical filter, standard size, newer pitch (beware), outer dia usual 98.2   aperture usual 89.9 (B+W), common on pro TV cameras
 o  M95x1             lens mount, laser galvo F-Theta scan lens
 o  M95x1             lens mount, machine vision, 1st choice; JIIA image size class VI
 o  M95x1             astro telescopes
====M95x1.5           ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M95x2             common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M95x2             on oil filters; lube; rare
    M95x2             bearing retaining locknut, "KM19", ISO 2982 (1971)
 %  M95x2.5           on oil filters; lube; rare-ish
=== M95x3             ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
=== M95x4             ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S95x4             buttress thread, fine, 33°, DIN 514
L   Tr95x4            trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd95(-6)          round/knuckle thread, DIN 405
=== M95x6             ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), "French Metric", DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
 p  S95(x7)           plastic lab containers
@   Rd95(x8)          round/knuckle thread, DIN 20400
@   S95x12            buttress thread, coarse, 33°, DIN 513
L   Tr95x12           trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews, secondary size
*   3.3/4" BSPT       ...see W4.2-11, W106.88x2.309, tapered, high pressure copper
@   3.3/4-18 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====3.3/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
@   3.3/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====3.3/4-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  3.750-12 UN       shipboard stuffing tube, ASTM F1836, US, size AA
 h  3.750-12          antique geodetic/surveying gear, pre-standard, male on tripod
*   3.3/4-11 BSPT     ...see W4.2-11, W106.88x2.309, tapered, high pressure copper
@   3.3/4-10 UNS      SAE regular, UNS (H28 1963), ASME B1.1-2003 Appendix D
H   3.3/4(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====3.3/4-8 UN        8UN, 8-thread, primary size, constant pitch series, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
====3.3/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   3.3/4(-4.5) BSF   British Whitworth Fine-pitch; 55°; BS 84-1956
=== 3.3/4(-4) UNC     M95.25x6.35, primary size, 4UN, ANC (NSTC 1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), BS 1580:1962
H   3.3/4-3           Whitworth thread proposal, 1841; as 3.750-3, 1857
@   3.3/4(-3) BSW     British Standard Whitworth; BS 84-1956 (55°; secondary size, avoid if possible); Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   3.3/4-3           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   3.3/4-3           Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   3.3/4-3           Sellers (1864), USS (Machinists Handbook 1909)
    3.3/4-3           in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
 o  M96x0.75          optical filter; on Angenieux Type 20x12 (3.5/12-240mm zoom lens), Angenieux 15-300mm zoom lens
====M96x1.5
====M96x2
====M96x3
====M96x4
H   96x8              S.F. No.14, French thread, S.F., System Francais; 60°; historical, before introduction of SI
@   M96x8             International (Zurych 1898, Machinist Handbook 1909)
 h  3.795-12          antique geodetic/surveying gear, pre-standard, male on tripod; J.C. Ulmer  and with 1.312-12 female thread
@o  3.8189-36 NS      97.0x0.706, filter thread, PH3.12, lens accessories attachment, female on lens front, US standard series, secondary standard
 o  M97x0.75          optical filters, nonstandard; on Swarowski ATX95/BTX95 spotting scope, female on lens
 w  M97x2             ordnance fuze; TP-M87, for 120mm mortar shells
@   M98x0.75          DIN 13-4
@   M98x1             DIN 13-5
====M98x1.5           DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M98x2             DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M98x3             DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M98x4             DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   Rd98(-6)          round/knuckle thread, DIN 405, secondary size
 h  3.860-12          antique geodetic/surveying gear, pre-standard, male on tripod; possibly Queen & Co. made by W. & L.E. Gurley
 o  3.875-32          lens mount, laser galvo F-Theta scan lens; 3.7/8-32, M98.425x0.794; uncommon
 h  3.875-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
c   3.7/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, 16AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
c   3.7/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, 12AN, AN (H28 1942/1944), N (B1.1-1935, not in 1939 HSTS, H28 1950), UN (H28 1957, H28 1963 2nd), aeronautical (H28 1944); UNF continuation; originally for boiler practice, thin nuts on shafts
 h  3.875-12          antique geodetic/surveying gear, pre-standard, male on tripod; Queen & Co.
@   3.7/8-10          SAE regular
H   3.7/8(-8) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   3.7/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
c   3.7/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   3.7/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   3.7/8(-3) BSW     British Standard Whitworth; 55°; old standard
H   3.7/8-3           sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
@   3.7/8-3           USS
 o  M99x0.75          astro telescopes
====M99x1.5           ISA E (1940, Czechoslovakia/Germany/Norway/Poland)
====M99x2             ISA B (1940, Czechoslovakia/Germany/Norway/Poland)
====M99x3             ISA C (1940, Czechoslovakia/Germany/Norway/Poland)
====M99x4             ISA D (1940, Czechoslovakia/Germany/Norway/Poland)
H   W99x1/6" LON      Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W99x1/6"          Whitworth Fine Thread 2 DIN 240, 55°, historical
====M99x6             SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W99x1/4"          Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   Glasg 99(x7.5)    electric lighting fittings, glass lamp covers, DIN 40450; obsolete, still made by few
 o  3.9-24 UNS        lens mount, unusual, flange focal dist. 11.8mm; up to 63mm sensors; in machine vision; JIIA image size class V
 h  3.909-12          antique geodetic/surveying gear, pre-standard, male on tripod; Young & Sons
====3.918-12 UNS      ABMA #20 locknut, AN-20, M99.52x2.12
====3.923-11 UNS      ABMA #20 locknut, NE-20, M99.64x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
 h  3.930-12          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
@   M100x0.75         DIN 13-4
 o  M100x0.75         optical filter; on LOMO 35BAS22-2, LOMO 35BAS23-2
@   M100x1            DIN 13-5
 o  M100x1            optical filter, on some C/CS-mount telecentric lenses
====M100x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
 %  M100x1.5          some cable gland ports
=== M100x2            common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M100x2            electrical conduit, also M100x3
    M100x2            bearing retaining locknut, "KM20", ISO 2982 (1971)
 h  3.937-12          antique geodetic/surveying gear, pre-standard, male on tripod
=== M100x3            ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
 %  M100x3            electrical conduit, also M100x2
=== M100x4            ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S100x4            buttress thread, fine, 33°, DIN 514
L   Tr100x4           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd100(-6)         round/knuckle thread, DIN 405
@   S100x5            buttress thread, 45°, DIN 2781; on hydraulic presses
 p  GL100(x5)         on glass containers, knuckle thread DIN 168; 60° internal, 30° external
 p  100-5             glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 99.5mm, depth 1.52mm, bump radius 1.118mm, bump base radius max.0.762mm, bump base width 3.05mm
 p  SP100(-5)         100SP, glass/plastic bottle thread, SP-400; 100-400; uncommon?
H   M100x6            US Metric Study Interim Report, suggested to ISO TC1/TC2 1973 meeting as OMFS (Optimum Metric Fastener System) series by IFI; matches standard ISO coarse
=== M100(x6)          M100; common; ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), ANSI/ASME B1.13M coarse, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   DN100(-4)         round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
 %  DN100             common on various hoses, couplings exist to G4"; also DN20, DN80
@   Rd100(x8)         round/knuckle thread, DIN 20400
 p  100x8             German bottle closure thread series; depth 2.72mm, crest radius 2.10mm, root radius 1.60mm
L   Tr100x12          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
 p  100-1x6           glass lug vacuum-seal jar, 6-start; 100-2055, GME 20.11, ISO 9100-13, FD 165, WGF-165S
@   S100x12           buttress thread, coarse, 33°, DIN 513
 h  3.950-12          antique geodetic/surveying gear, pre-standard, male on tripod; Eugene Dietzgen
@   100.330-11        CTG 92-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
=== G3.1/2(-11)       G100.33x2.309, W3.95-11, W100.3x2.31, tapered, BSPT, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); Whitworth pipe thread (Machinist Handbook 1909, as W3.912-11); less common size?
 %  3.1/2-11 BSPP     on hydraulic pipes with outer dia approx. 4"
@   M100.5x0.5        Thorlabs SM100
 o  M100.5x0.5        Thorlabs SM100, aperture 96.4mm
 o  M100.75x0.5       some lens mounting rings, eg. Thorlabs
 h  3.969-10          antique geodetic/surveying gear, pre-standard, male on tripod; A. Lietz Co.
====3.1/2-8NPSH       3.970-8, 3.5" NPSH, 100.84x3.175, firehose/hydrant coupling thread, NPSH/IPT 3.5"; ANSI/ASME B1.20.7
 %  3.1/2-8NPSH       firefighting, attack hose, 3" hose
 o  M101x1            some lens mounting rings
@   3.977(-16)        BS copper pipe thread, BScopper, 3.3/4" inner dia; W101.02x1.59
 h  3.997-12          antique geodetic/surveying gear, pre-standard, male on tripod; J.C. Sala, San Francisco
===== 3.1/2" pipe     4.000 in, 101.6 mm outer diameter, US standard, DN 90, NPS 3 1/2, nominal pipe size, ANSI/ASME B36; NFPA 89mm; ASTM B42 copper B43 red brass, wall th 0.250"/6.35mm standard, 0.321"/8.15mm extra strong; ASTM B302 threadless Cu, 0.095"/2.41mm
===== 4" Cu tube      DN100, 101.6mm outer-diameter tube; AS 1432 wall thick 2.03mm/14g (A/green, 1.50 MPa), 1.63mm/16g (B/blue, 1.20MPa), 1.22mm/18g (D/black, 0.89 MPa); AS/NZS 1571, wall thick 1.63mm (1.20 MPa); ASTM A270 sanitary stainless, 0.083"/2.11mm
*   4" BSPT           ...see W4.45-11, W113.03x2.309, tapered
*   4" NPT            ...see 4.1/2-8, M114.30x3.175
*   4" NPSH           ...see 4.470-8; hose thread
*   4" NH             ...see 4.908-6; hose thread
@   4-24 UNS
 o  4-24 UNS          lens mount, US standard series, male on lens, PH3.10
====4-16 UN           16UN, 16-thread, primary size, constant pitch series, SAE extra fine (1915/1926), 16AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944); UNEF continuation; originally for adjusting collars, retaining nuts
 o  4"-16             on astronomy telescopes, adaptor at focuser; Meade LX200 16 Inch SC
@   4-16 BUTT         buttress thread, 7/45°, ANSI B1.9
@   4-14 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
 o  4-12 Whitw.       British camera lens flange fittings, R.P.S. standard
====4-12 UN           12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963), aeronautical (H28 1944), BS 1580:1962 ("UNF"); UNF continuation; originally for boiler practice, thin nuts on shafts
 %  4.000-12 UN       shipboard stuffing tube, ASTM F1836, US, size BB
@   4-12 BUTT         buttress thread, 7/45°, ANSI B1.9
*   4-11 BSPT         ...see W4.45-11, W113.03x2.309, tapered
@   4-10 UNS          SAE regular (1915/1926), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   4-10 BUTT         buttress thread, 7/45°, ANSI B1.9
*   4-8 NPT           ...see 4.1/2-8, M114.30x3.175
*   4-8 NPSH          ...see 4.470-8; hose thread
====4-8 UN            8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963), aeronautical (H28 1944); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
=== NPT 3.1/2(-8)     3.9888-8, ~4-8, M101.36x3.175, IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series; Briggs Pipe Thread (1882, Machinist Handbook 1909)
@   4-8 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   4-6 NH            ...see 4.908-6; hose thread
H   4(-6) ADMF        Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====4-6 UN            6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   4-6 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   4-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   4(-4.5) BSF       British Whitworth Fine-pitch; 55°; BS 84-1956
=== 4(-4) UNC         M101.6x6.35, primary size, 4UN, ANC (NSTC 1933, H28 1942/1944), NC (B1.1-1935), UNC (H28 1950/1957), UNC/UN (H28 1963), BS 1580:1962
    4-4 UNC           on crane hooks; minimum size for #17/#17A hook/crane, workload limit 44.9/59.5 tons (Crosby/Bullard)
@   4-4 BUTT          buttress thread, 7/45°, ANSI B1.9
H   4-3               Whitworth thread proposal, 1841; as 4.000-3, 1857
@   4(-3) BSW         British Standard Whitworth; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   4"-3              sharp "V" thread, 60°, historical, used in USA until 1909; American Machinists Handbook 1909
H   4-3               Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   4-3               Sellers (1864), USS (Machinists Handbook 1909)
    4-3               in TM 9-254 thread chart ("General Maintenance Procedures for Fire Control Materiel", 1958, old WW2-era military hardware)
L   4"-2 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C
@   M102x0.75         DIN 13-4
@   M102x1            DIN 13-5
 o  M102x1            astro telescopes
 o  M102x1            lens mount, laser galvo F-Theta scan lens
====M102x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M102x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M102x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M102x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   4.035-40          M102.49x0.635, Thorlabs SM4
 o  4.035"-40         lens mount, 102.49x0.635, Thorlabs SM4, aperture 96.8mm
H   W104x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W104x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M104x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W104x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
 o  4.1"-24           M104.1-24, M104.1x1.06; on astronomy telescopes, Starlight Instruments 3.5" Feathertouch Focuser, telescope side
 h  4.100-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley
====4.122-12 UNS      ABMA #21 locknut, AN-21, M104.7x2.12
====4.127-11 UNS      ABMA #21 locknut, NE-21, M104.8x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
===== 4" Cu pipe      4" 101.6mm nominal bore, 4.1/8" 104.8mm outer diameter pipe; ASTM B88 type K/0.134"/3.4mm, L/0.114"/2.9mm, M/0.095"/2.41mm; ASTM 306 copper, 0.058"/1.47mm; plumbing copper pipe in USA/Canada
===== 4.1/8" Cu tube  104.8mm outer-diameter tube; AS/NZS 1571, wall thick 2.79mm (2.01 MPa)
 h  4.125-18          antique geodetic/surveying gear, pre-standard, male on tripod; W. & L.E. Gurley and some S&K instruments (copies of Gurley Wye Levels made in Japan)
c   4.1/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   4.1/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   4.1/8-10          USS
c   4.1/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   4.1/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   4.1/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   4.1/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   4.1/8(-3) BSW     British Standard Whitworth; 55°; old standard
===== 105mm Cu tube   105mm outer-dia tube; ASTM B88M type A/3.4mm, B/2.8mm, C/2.4mm
@   M105x0.75         DIN 13-4
 o  M105x0.75         optical filter
@   M105x1            DIN 13-5
 o  M105x1            lens mount, machine vision, 1st choice; JIIA image size class VII
 o  M105x1.0          "105C", optical filter, outer dia usual 109.8  aperture usual 100 (B+W)
====M105x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M105x2            common; ISO 261 2nd, ISO secondary fine, electrical conduit DIN 89280, BS 3643-1:1981 2nd constant, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
    M105x2            bearing retaining locknut, "KM21", ISO 2982 (1971)
=== M105x3            ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M105x4            ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S105x4            buttress thread, fine, 33°, DIN 514
L   Tr105x4           trapezoidal fine, 30°, DIN 103; for leadscrews
=== M105x6            ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
    S105(x6)          plastic lab containers, Hunesdorff
@   Rd105(-4)         round/knuckle thread, DIN 405, secondary size
@   S105x12           buttress thread, coarse, 33°, DIN 513
L   Tr105x12          trapezoidal coarse, 30°, DIN 103; for leadscrews
@   S106x5            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd106(x8)         round/knuckle thread, DIN 20400
H   106x8.5           S.F. No.15, French thread, S.F., System Francais; 60°; historical, before introduction of SI
====G3.3/4(-11)       G106.68x2.309, W4.20-11, W106.68x2.31, tapered, BSPT, BSP pipe thread, BSPP, BSPT; Whitworth pipe thread (Machinist Handbook 1909, as W4.1255-11); very uncommon size
 o  M107x0.75         "107", optical filter
 o  M107x1            "107C", optical filter, common on pro TV cameras, on some C/CS-mount lenses, astro telescopes
====3.1/2-6 NH        4.243-6, 3.5-6 NH, 107.77x4.233, firehose/hydrant coupling thread, NH/NST 3.5"; NSTC 1924/1928/1933, H28 1942/1944 (American National Fire-hose Coupling), NFPA 1963
    3.1/2-6 NH        firefighting, attack hose, 3.1/2" hose (NFPA 1963 requirement)
====4.1/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   4.1/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====4.1/4-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
 h  4.250-12          antique geodetic/surveying gear, pre-standard, male on tripod; Young & Sons also Heer & Seelig
@   4.1/4-10 UNS      SAE regular, UNS (H28 1963), ASME B1.1-2003 Appendix D
====4.1/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   4.1/4(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====4.1/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   4.1/4(-4) BSF     British Whitworth Fine-pitch; 55°; BS 84-1956
====4.1/4-4 UN        4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
H   4.1/4-2.7/8       Whitworth thread proposal, 1841; as 4.250-2.875, 1857
@   4.1/4(-2.875) BSW British Standard Whitworth; 55°; Whitworth 1841/1857; mentioned by Sellers (1864); old standard
H   4.1/4-2.7/8       Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in all lists
@   4.1/4-2.7/8       Sellers (1864), USS (Machinists Handbook 1909)
@   4.1/4-2           USS
===== 108mm Cu tube   108mm outer-dia tube; EN 1057, wall th 1.5(X),2.5(Y)mm; BS 2871, table X (wall th 1.5mm, 1.7 MPa), Y (2.5mm, 2.2 MPa), Z (1.2mm, 1.7 MPa); copper pipe in Europe; usually 2.5mm wall thickness
@   M108x0.75         DIN 13-4
@   M108x1            DIN 13-5
====M108x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
@   4.251(-16)        BS copper pipe thread, BScopper, 4" inner dia; W108x1.59
====M108x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
 %  M108x2.5          on oil filters; hydraulic; rare
====M108x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M108x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
 o  M108.5x0.75       optical filter; on Angenieux 10x25 T2 (25-250mm) zoom lens
 h  4.281-12          antique geodetic/surveying gear, pre-standard, male on tripod; possible Young & Sons
 o  M109x1.5          astro telescopes
H   W109x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W109x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M109x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W109x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
 h  4.300-12          antique geodetic/surveying gear, pre-standard, male on tripod
 o  M109.35-24        on astronomy telescopes, Astrophysics Traveler 2.7" focuser, telescope side
====4.325-12 UNS      ABMA #22 locknut, AN-22, M109.9x2.12
====4.330-11 UNS      ABMA #22 locknut, N-22, M110.0x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
@   M110x0.75         DIN 13-4
@   M110x1            DIN 13-5
 o  M110x1            lens mount, laser galvo F-Theta scan lens
====M110x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
 %  M110x1.5          some cable gland ports
=== M110x2            common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, electrical conduit EN 60423, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
    M110x2            bearing retaining locknut, "KM22", ISO 2982 (1971)
=== M110x3            ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
 %  M110x3            electrical conduit
=== M110x4            ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S110x4            buttress thread, fine, 33°, DIN 514
L   Tr110x4           trapezoidal fine, 30°, DIN 103; for leadscrews
 p  SP110(-5)         110SP, glass/plastic bottle thread, SP-400; 110-400; uncommon?; 110-400 is 110mm widemouth Mason jar
=== M110x6            ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   Rd110(-4)         round/knuckle thread, DIN 405
 p  110x8             German bottle closure thread series; depth 2.72mm, crest radius 2.10mm, root radius 1.60mm
@   S110x12           buttress thread, coarse, 33°, DIN 513
L   Tr110x12          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
!p  110-0.875x8       glass lug vacuum-seal jar, 8-start; common canning size; 110-2070, GME 20.12, ISO 9100-14, FD 140, WGF-140S (regular)
c   4.3/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   4.3/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   4.3/8-10          SAE regular
c   4.3/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   4.3/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   4.3/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   4.3/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   4.3/8(-2.875) BSW British Standard Whitworth; 55°; old standard
@%  4.3916-10         British water well casing, nominal bore 4", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 1.3/8"
@   M112x1            DIN 13-5
 o  M112x1            optical filter (B+W)
====M112x1.5          DIN 13-6, DIN 516, SI M.ME
 o  M112x1.5          optical filter
====M112x2            DIN 13-7, DIN 247, SI M.MD
====M112x3            DIN 13-8, DIN 246, SI M.MC
====M112x4            DIN 13-9, DIN 245, SI M.MB
@   S112x5            buttress thread, 45°, DIN 2781; on hydraulic presses
 p  GL112(x5)         on glass containers, knuckle thread DIN 168; 60° internal, 30° external
@   Rd112(x8)         round/knuckle thread, DIN 20400
@   113.030-11        CTG 104-11, thick steel conduit thread, 55°; Japanese, JIS C 8305
=== G4(-11)           G113.03x2.309, W4.45-11, W113.0x2.31, 4 BSPT, 4-11 BSPT, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); Whitworth pipe thread (Machinist Handbook 1909, as W4.339-11)
 %  4-11 BSPP         on hydraulic pipes with outer dia approx. 4.1/2"
 h  4.468-12          antique geodetic/surveying gear, pre-standard, male on tripod
====4-8NPSH           4.470-8, 4" NPSH, 113.54x3.175, firehose/hydrant coupling thread, NPSH/IPT 4"; ANSI/ASME B1.20.7
 %  4-8NPSH           firefighting, supply line hose, 4" hose
 o  M114x1            astro telescopes
 o  M114x1            optical filters
H   W114x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W114x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M114x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W114x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
===== 4" pipe         4.500 in, 4.1/2", 114.3 mm outer diameter, DN 100, NPS 4, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 100mm, ASTM copper tube 105mm, NFPA 102mm, AWWA 100mm; ASTM B42 copper B43 red brass, wall th 0.250"/6.35mm standard, 0.341"/8.66mm extra strong; ASTM B302 threadless Cu, 0.107"/2.72mm
*   4.1/2" NPT        ...see 5-8, M127.0x3.175
*   4-1/2 NPSH        ...see 4.978-8; hose thread
====4.1/2-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   4.1/2-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====4.1/2-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   4.5-12 BUTT       buttress thread, 7/45°, ANSI B1.9
 h  4.500-11          antique geodetic/surveying gear, pre-standard, male on tripod; Fauth & Co.
@   4.1/2-10 UNS      SAE regular (1915/1926), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   4.5-10 BUTT       buttress thread, 7/45°, ANSI B1.9
====4.1/2-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
=== NPT 4(-8)         4.4871-8, ~4.1/2-8, M113.972x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series; Briggs Pipe Thread (1882, Machinist Handbook 1909)
@   4.5-8 BUTT        buttress thread, 7/45°, ANSI B1.9
@   4.1/2(-8) CSG     Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
*   4.1/2-8 NPT       ...see 5-8, M127.0x3.175
*   4.1/2-8 NPSH      ...see 4.970-8; hose thread
H   4.1/2(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====4.1/2-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   4.5-6 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   4.5-5 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   4.1/2(-5) BTC     Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
====4.1/2-4 UN        4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
@   4.5-4 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   4.5-3 BUTT        buttress thread, 7/45°, ANSI B1.9
H   4.1/2-2.7/8       Whitworth thread proposal, 1841; as 4.500-2.875, 1857
@   4.1/2(-2.875) BSW British Standard Whitworth; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   4.1/2-2.3/4       Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in all lists
@   4.1/2-2.3/4       Sellers (1864), USS (Machinists Handbook 1909)
@   4.1/2-2           USS
L   4.1/2-2 ACME      for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size, class 2G/3G/4G/2C/3C/4C/5C/6C
 o  M115x0.75         optical filter
@   M115x1            DIN 13-5
 o  M115x1            optical filter; on LOMO OKC1-18-1
====M115x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M115x2            ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
    M115x2            bearing retaining locknut, "KM23", ISO 2982 (1971)
====M115x3            ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M115x4            ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M115x6            ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S115x6            buttress thread, fine, 33°, DIN 514
L   Tr115x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd115(-4)         round/knuckle thread, DIN 405, secondary size
@   S115x14           buttress thread, coarse, 33°, DIN 513
L   Tr115x14          trapezoidal coarse, 30°, DIN 103; for leadscrews
 o  M116x?            optical filter, on MTO-11SA lens
H   116x9             S.F. No.16, French thread, S.F., System Francais; 60°; historical, before introduction of SI
@   M116x9            International (Zurych 1898, Machinist Handbook 1909)
 h  4.590-12          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
 o  M117x1            lens mount, astro telescope; visual back on larger GSO RC telescopes
c   4.5/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   4.5/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
 h  4.625-12          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
@   4.5/8-10          SAE regular
c   4.5/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
c   4.5/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   4.5/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 h  4.635-12          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly
@   M118x1            DIN 13-5
====M118x1.5          DIN 13-6, DIN 516, SI M.ME
====M118x2            DIN 13-7, DIN 247, SI M.MD
====M118x3            DIN 13-8, DIN 246, SI M.MC
====M118x4            DIN 13-9, DIN 245, SI M.MB
@   S118x5            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd118(x8)         round/knuckle thread, DIN 20400
H   W119x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W119x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M119x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W119x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====4.716-12 UNS      ABMA #24 locknut, AN-24, M119.8x2.12
====4.721-11 UNS      ABMA #24 locknut, NE-24, M119.9x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
@   M120x1            DIN 13-5
 o  M120x1            lens mount
====M120x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M120x2            common; ISO 261 2nd, ISO secondary fine, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
 %  M120x2            on oil filters; hydraulic; rare
    M120x2            bearing retaining locknut, "KM24", ISO 2982 (1971)
====M120x3            ISO 261 2nd, ISO secondary fine, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M120x4            ISO 261 2nd, ISO secondary fine (coarse), DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
 p  120-5             glass bottle thread, British, BS 1918:1953; R-3/2 finish; round 60°, main dia 119.5mm, depth 1.52mm, bump radius 1.118mm, bump base radius max.0.762mm, bump base width 3.05mm
 p  SP120(-5)         120SP, glass/plastic bottle thread, SP-400; 120-400 on lab containers
====M120x6            ISO 261 2nd, ISO secondary (coarse), DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S120x6            buttress thread, fine, 33°, DIN 514
L   Tr120x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd120(-4)         round/knuckle thread, DIN 405
@   S120x14           buttress thread, coarse, 33°, DIN 513
L   Tr120x14          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
====4.3/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   4.3/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
 h  4.750-14          antique geodetic/surveying gear, pre-standard, male on tripod; Possible Young & Sons found on a Young & Sons transit appears to be original to the instrument
====4.3/4-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   4.3/4-10 UNS      SAE regular, UNS (H28 1963), ASME B1.1-2003 Appendix D
====4.3/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   4.3/4(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====4.3/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
====4.3/4-4 UN        4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
H   4.3/4-2.3/4       Whitworth thread proposal, 1841; as 3.750-2.75, 1857
@   4.3/4(-2.75) BSW  British Standard Whitworth; 55°; Whitworth 1841/1857; mentioned by Sellers (1864); old standard
H   4.3/4-2.5/8       Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in all lists
@   4.3/4-2.5/8       Sellers (1864), USS (Machinists Handbook 1909); 4.3/4-2.625
@   M122x1            DIN 13-5
 o  M122x1            optical filter (B+W)
====M122x1.5          DIN 13-6, DIN 516, SI M.ME
====M122x2            DIN 13-7, DIN 247, SI M.MD
====M122x3            DIN 13-8, DIN 246, SI M.MC
====M122x4            DIN 13-9, DIN 245, SI M.MB
@   Glasg 123.5(x7.5) electric lighting fittings, glass lamp covers, DIN 40450; obsolete, still made by few
 %  4.55/64-6         fire hydrants, for 4" hose, Raleigh City (check)
 o  M123.75-24        on astronomy telescopes, Starlight Instruments 3,5" Feathertouch Focuser, telescope side
c   4.7/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   4.7/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
c   4.7/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   4.7/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   4.7/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   4.7/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
H   W124x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W124x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M124x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W124x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====4-6 NH            4.908-6, 4" NH, 4-6 NH (SPL), 124.66x4.233, hose thread, NH 4"; US Navy, marine applications; see also 4-4 NH for firefighting uses
 o  M125x0.75         lens thread, rare; some thermal imaging lenses
@   M125x1            DIN 13-5
 o  M125x1            astro telescopes
====M125x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M125x2            ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
    M125x2            bearing retaining locknut, "KM25", ISO 2982 (1971)
=== M125x3            ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M125x4            ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S125x5            buttress thread, 45°, DIN 2781; on hydraulic presses
 p  GL125(x5)         on glass containers, knuckle thread DIN 168; 60° internal, 30° external
=== M125x6            ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S125x6            buttress thread, fine, 33°, DIN 514
L   Tr125x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd125(-4)         round/knuckle thread, DIN 405, secondary size
@   DN125(-4)         round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
=== M125x8            ISO 261 1st, ISO extended
@   Rd125(x8)         round/knuckle thread, DIN 20400
 p  125x8             German bottle closure thread series; depth 2.72mm, crest radius 2.10mm, root radius 1.60mm
@   S125x14           buttress thread, coarse, 33°, DIN 513
L   Tr125x14          trapezoidal coarse, 30°, DIN 103; for leadscrews
=== G4.1/2(-11)       G125.73x2.309, W4.95-11, W125.7x2.31, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); less common size
 %  4.1/2-11 BSPP     on hydraulic pipes with outer dia approx. 4"
 o  M126x1            astro telescopes
 %  M126x4            on oil filters; lube; rare
H   126x9.5           S.F. No.17, French thread, S.F., System Francais; 60°; historical, before introduction of SI
====4.1/2-8NPSH       4.970-8, 4.5" NPSH, 126.24x3.175, firehose/hydrant coupling thread, NPSH/IPT 4.5"; ANSI/ASME B1.20.7
*   5" BSPT           ...see W5.45-11, W138.43-11, tapered
*   5" NPT            ...see 5.563-8, M141.3x3.175
*   5" NPSH           ...see 5.560-8; hose thread
===== 5" Cu tube      DN125, 127.0mm outer-diameter tube; AS 1432 wall thick 2.03mm/14g (A/green, 1.20 MPa), 1.63mm/16g (B/blue, 0.96MPa), 1.42mm/17g (D/black, 0.83 MPa)
 o  M127x0.75         optical filter, common on pro TV cameras
 o  M127x1            optical filter
====5-16 UN           16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   5-14 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
 o  5-12 Whitw.       British camera lens flange fittings, R.P.S. standard
====5-12 UN           12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   5-12 BUTT         buttress thread, 7/45°, ANSI B1.9
*   5-11 BSPT         ...see W5.45-11, W138.43-11, tapered
@   5-10 UNS          SAE regular (1915/1926), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   5-10 BUTT         buttress thread, 7/45°, ANSI B1.9
=== NPT 4.1/2(-8)     5-8, M127.0x3.175, IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909); not included in Dryseal series
====5-8 UN            8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   5-8 BUTT          buttress thread, 7/45°, ANSI B1.9
@   5(-8) CSG         Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
*   5-8 NPT           ...see 5.563-8, M141.3x3.175
*   5-8 NPSH          ...see 5.560-8; hose thread
H   5(-6) ADMF        Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====5-6 UN            6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   5-6 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   5-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   5(-5) BTC         Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
====5-4 UN            4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
@   5-4 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   5-3 BUTT          buttress thread, 7/45°, ANSI B1.9
H   5-2.3/4           Whitworth thread proposal, 1841; as 5.000-2.75, 1857
@   5(-2.75) BSW      British Standard Whitworth; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   5-2.5             Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   5-2.5             Sellers (1864), USS (Machinists Handbook 1909)
L   5"-2 ACME         for leadscrews, Acme trapezoidal thread, angle 29-deg; standard size (NSTC 1933, H28 1942/1944), class 2G/3G/4G/2C/3C/4C/5C/6C
====4-4 NH            5.010-4, 127.25x6.350, firehose/hydrant coupling thread, NH/NST 4"; NFPA 1963; see also 4-6 NH
 %  4-4 NH            firefighting, supply line hose, 4" hose (NFPA 1963 requirement)
@   M128x1            DIN 13-5
 o  M128x1            astro telescopes
====M128x1.5          DIN 13-6, DIN 516, SI M.ME
====M128x2            DIN 13-7, DIN 247, SI M.MD
====M128x3            DIN 13-8, DIN 246, SI M.MC
====M128x4            DIN 13-9, DIN 245, SI M.MB
H   W129x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W129x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M129x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W129x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====5.106-12 UNS      ABMA #26 locknut, AN-26, M129.7x2.12
====5.111-12 UNS      ABMA #26 locknut, NE-26, M129.8x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
===== 130mm Cu tube   130mm outer-dia tube; ASTM B88M type A/4.0mm, B/3.1mm, C/2.7mm
@   M130x1            DIN 13-5
 o  M130x1            astro telescopes
====M130x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M130x2            common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-7, DIN 247 (1st), SI M.MD, SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
    M130x2            bearing retaining locknut, "KM26", ISO 2982 (1971)
=== M130x3            ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M130x4            ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
=== M130x6            ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S130x6            buttress thread, fine, 33°, DIN 514
L   Tr130x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd130(-4)         round/knuckle thread, DIN 405
=== M130x8            ISO 261 2nd, ISO extended, DIN 13-11
@   S130x14           buttress thread, coarse, 33°, DIN 513
L   Tr130x14          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
===== 5" Cu pipe      5" 127.0mm nominal bore, 5.1/8" 130.2mm outer diameter pipe; ASTM B88 type K/0.160"/4.06mm, L/0.125"/3.18mm, M/0.109"/2.77mm; ASTM 306 copper, 0.072"/1.83mm; plumbing copper pipe in USA/Canada
c   5.1/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   5.1/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   5.1/8-10          SAE regular
c   5.1/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   5.1/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   5.1/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   5.1/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   M132x1            DIN 13-5
 o  M132x1            lens mount, laser galvo F-Theta scan lens
====M132x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M132x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M132x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M132x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
@   S132x5            buttress thread, 45°, DIN 2781; on hydraulic presses
===== 133mm Cu tube   133mm outer-dia tube; EN 1057, wall th 1.5(X),3.0mm; BS 2871, 133.4mm/5.25" outer dia, table X (wall th 1.5mm, 1.4 MPa), Z (1.5mm, 1.6 MPa); copper pipe in Europe
 o  M133x1            astro telescopes
@   Rd133(x10)        round/knuckle thread, DIN 20400
====5.1/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   5.1/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====5.1/4-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   5.1/4-10 UNS      SAE regular, UNS (H28 1963), ASME B1.1-2003 Appendix D
====5.1/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   5.1/4(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====5.1/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
====5.1/4-4 UN        4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
H   5.1/4-2.5/8       Whitworth thread proposal, 1841; as 5.250-2.625, 1857
@   5.1/4(-2.625) BSW British Standard Whitworth; 55°; Whitworth 1841/1857; mentioned by Sellers (1864); old standard
H   5.1/4-2.1/2       Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in all lists
@   5.1/4-2.1/2       Sellers (1864), USS (Machinists Handbook 1909)
H   W134x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W134x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M134x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W134x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M135x1            DIN 13-5
====M135x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M135x2            ISO 261 3rd, ISO tertiary fine, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
    M135x2            bearing retaining locknut, "KM27", ISO 2982 (1971)
====M135x3            ISO 261 3rd, ISO tertiary fine, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M135x4            ISO 261 3rd, ISO tertiary fine (coarse), DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M135x6            ISO 261 3rd, ISO tertiary (coarse), DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S135x6            buttress thread, fine, 33°, DIN 514
L   Tr135x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd135(-4)         round/knuckle thread, DIN 405, secondary size
@   S135x14           buttress thread, coarse, 33°, DIN 513
L   Tr135x14          trapezoidal coarse, 30°, DIN 103; for leadscrews
H   136x10            S.F. No.18, French thread, S.F., System Francais; 60°; historical, before introduction of SI
@   M136x10           International (Zurych 1898, Machinist Handbook 1909)
c   5.3/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, SAE extra fine, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   5.3/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   5.3/8-10          SAE regular
c   5.3/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   5.3/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   5.3/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   5.3/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   M138x1            DIN 13-5
 o  M138x1            lens mount
====M138x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M138x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M138x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M138x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
=== G5(-11)           G138.43x2.309, W5.45-11, W138.4x2.31, 5-11 BSPT, tapered, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT)
 %  5-11 BSPP         on hydraulic pipes with outer dia approx. 5.1/2"
====5.1/2-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   5.1.2-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====5.1/2-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   5.5-12 BUTT       buttress thread, 7/45°, ANSI B1.9
@   5.1/2-10 UNS      SAE regular (1915/1926), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   5.5-10 BUTT       buttress thread, 7/45°, ANSI B1.9
====5.1/2-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   5.5-8 BUTT        buttress thread, 7/45°, ANSI B1.9
@   5.1/2(-8) CSG     Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
H   5.1/2(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====5.1/2-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   5.5-6 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   5.5-5 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   5.1/2(-5) BTC     Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
====5.1/2-4 UN        4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
@   5.5-4 BUTT        buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   5.5-3 BUTT        buttress thread, 7/45°, ANSI B1.9
H   5.1/2-2.5/8       Whitworth thread proposal, 1841; as 5.500-2.625, 1857
@   5.1/2(-2.625) BSW British Standard Whitworth; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   5.1/2-2.3/8       Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in all lists
@   5.1/2-2.3/8       Sellers (1864), USS (Machinists Handbook 1909); 5.1/2-2.375
H   W139x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W139x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M139x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W139x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====5.497-12 UNS      ABMA #28 locknut, AN-28, M139.6x2.12
====5.502-11 UNS      ABMA #28 locknut, NE-28, M139.8x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
@   M140x1            DIN 13-5
====M140x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M140x2            ISO 261 1st, common; ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
    M140x2            bearing retaining locknut, "KM28", ISO 2982 (1971)
=== M140x3            ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M140x4            ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
@   S140x5            buttress thread, 45°, DIN 2781; on hydraulic presses
=== M140x6            ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S140x6            buttress thread, fine, 33°, DIN 514
L   Tr140x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd140(-4)         round/knuckle thread, DIN 405
=== M140x8            ISO 261 1st, ISO extended, DIN 13-11
@   Rd140(x10)        round/knuckle thread, DIN 20400
@   S140x14           buttress thread, coarse, 33°, DIN 513
L   Tr140x14          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
====5-8NPSH           5.560-8, 5" NPSH, 141.22x3.175, firehose/hydrant coupling thread, NPSH/IPT 5"; ANSI/ASME B1.20.7
=====5" pipe          5.563 in, 141.3 mm outer diameter, DN 125, NPS 5, nominal pipe size, US standard, ANSI/ASME B36; ASTM copper tube 130mm, NFPA 127mm; ASTM B42 copper B43 red brass, wall th 0.250"/6.35mm standard, 0.375"/9.52mm extra strong; ASTM B302 threadless Cu, 0.132"/3.35mm
=== NPT 5(-8)         5.5493-8, M140.919x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909); not included in Dryseal series
@   M142x1            DIN 13-5
====M142x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M142x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M142x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M142x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
c   5.5/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   5.5/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
c   5.5/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   5.5/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   5.5/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   5.5/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
 o  M144x0.75         optical filter, on some telecentric industrial lenses
H   W144x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W144x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M144x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W144x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M145x1            DIN 13-5
 o  M145x1            lens mount, telescope
====M145x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), GOST 9150-59 constant, GOST 24705-81
====M145x2            ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
    M145x2            bearing retaining locknut, "KM29", ISO 2982 (1971)
====M145x3            ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
====M145x4            ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M145x6            ISO 261 3rd, ISO tertiary (coarse), BS 3643-1:1981 3rd constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S145x6            buttress thread, fine, 33°, DIN 514
L   Tr145x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd145(-4)         round/knuckle thread, DIN 405, secondary size
@   S145x14           buttress thread, coarse, 33°, DIN 513
L   Tr145x14          trapezoidal coarse, 30°, DIN 103; for leadscrews
====5.3/4-16 UN       16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   5.3/4-14 UNS      UNS (H28 1963), ASME B1.1-2003 Appendix D
====5.3/4-12 UN       12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   5.3/4-10 UNS      SAE regular, UNS (H28 1963), ASME B1.1-2003 Appendix D
====5.3/4-8 UN        8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   5.3/4(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====5.3/4-6 UN        6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
====5.3/4-4 UN        4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
H   5.3/4-2.1/2       Whitworth thread proposal, 1841; as 5.750-2.5, 1857
@   5.3/4(-2.5)       BSW British Standard Whitworth; 55°; Whitworth 1841/1857; mentioned by Sellers (1864); old standard
H   5.3/4-2.3/8       Sellers (1864), USS; Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread; not in all lists
@   5.3/4-2.3/8       Sellers (1864), USS (Machinists Handbook 1909); 5.3/4-2.375
=== 4.1/2-4 NH        5.760-4, 4.5-4 NH, 146.30x6.350, firehose/hydrant coupling thread, NH/NST 4.5"; NSTC 1924/1928/1933, H28 1942/1944 (American National Fire-hose Coupling), NFPA 1963
 %  4.5-4 NH          firefighting; on US fire hydrants; pumper (steamer) port with either 4.5-4 NH threads or a 5-inch Storz port (one port per hydrant; NFPA 1963 requirement); also two 2.5-7.5 NH "attack ports"
 %  4.5-4 NH          firefighting, forestry hose, 4" hose
 %  4.5-4 NH          firefighting, supply line hose, 4" hose
 o  M147x1.5          astro telescopes
c   5.7/8-16 UN       16UN, 16-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNEF continuation; originally for adjusting collars, retaining nuts
c   5.7/8-12 UN       12UN, 12-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNF continuation; originally for boiler practice, thin nuts on shafts
c   5.7/8-8 UN        8UN, 8-thread, secondary size, constant pitch series, UN 2nd (H28 1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
H   5.7/8(-6) ADMF    Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
c   5.7/8-6 UN        6UN, 6-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
c   5.7/8-4 UN        4UN, 4-thread, secondary size, constant pitch series, UN 2nd (H28 1963)
@   M148x1            DIN 13-5
====M148x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M148x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M148x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M148x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
H   148x10.5          S.F. No.19, French thread, S.F., System Francais; 60°; historical, before introduction of SI
H   W149x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W149x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====M149x6            SI M.MA, ISA A (1940, Czechoslovakia/Germany/Norway/Poland)
H   W149x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====5.888-12 UNS      ABMA #30 locknut, AN-30, M149.6x3.18
====5.893-11 UNS      ABMA #30 locknut, NE-30, M149.7x3.31; obsolete pitch since 1930s, use 8 or 12 tpi
@   M150x1            DIN 13-5
 o  M150x1            lens mount, laser galvo F-Theta scan lens
====M150x1.5          ISO extended, DIN 13-6, DIN 516, SI M.ME, ISA E (1940), GOST 9150-59 constant, GOST 24705-81
=== M150x2            common; ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), SI fine (1971), ANSI/ASME B1.13M fine, GOST 9150-59 constant, GOST 24705-81
    M150x2            bearing retaining locknut, "KM30", ISO 2982 (1971)
=== M150x3            ISO 261 2nd, ISO secondary fine, BS 3643-1:1981 2nd constant, DIN 13-8, DIN 246 (1st), SI M.MC, ISA C (1940), SI fine (1971), GOST 9150-59 constant, GOST 24705-81
=== M150x4            ISO 261 2nd, ISO secondary fine (coarse), BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
=== M150x6            ISO 261 2nd, ISO secondary (coarse), BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, SI M.MA, ISA A (1940, Denmark/Finland/France/Italy/Netherlands/Sweden/Switzerland/USSR), GOST 9150-59 constant, GOST 24705-81
@   S150x6            buttress thread, fine, 33°, DIN 514
@   S150x6            buttress thread, 45°, DIN 2781; on hydraulic presses
L   Tr150x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd150(-4)         round/knuckle thread, DIN 405
@   DN150(-4)         round/knuckle thread, DIN 11851, "dairy thread"; easy to clean, common in food industry
=== M150x8            ISO 261 2nd, ISO extended, DIN 13-11
@   Rd150(x10)        round/knuckle thread, DIN 20400
@   S150x16           buttress thread, coarse, 33°, DIN 513
L   Tr150x16          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
=== G5.1/2(-11)       G151.13x2.309, W5.95-11, W151.1x2.31, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT); less common size
@   M152x1            DIN 13-5
====M152x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M152x2            DIN 13-7, DIN 247, SI M.MD, ISA D (1940)
====M152x3            DIN 13-8, DIN 246, SI M.MC, ISA C (1940)
====M152x4            DIN 13-9, DIN 245, SI M.MB, ISA B (1940)
*   6" BSP            ...see W6.45-11, W163.8x2.309, G6", BSP pipe thread
*   6" NPT            ...see 6.5/8-8, M168.275x3.175
*   6" NPSH           ...see 6.620-8; hose thread
===== 6" Cu tube      DN150, 152.4mm outer-diameter tube; AS 1432 wall thick 2.64mm/12g (A/green, 1.30 MPa), 2.03mm/14g (B/blue, 1.00MPa), 1.63mm/16g (D/black, 0.80 MPa); ASTM A270 sanitary stainless, 0.109"/2.77mm
====6-16 UN           16UN, 16-thread, primary size, constant pitch series, SAE extra fine, UN (H28 1950/1957/1963); UNEF continuation; originally for adjusting collars, retaining nuts
@   6-14 UNS          UNS (H28 1963), ASME B1.1-2003 Appendix D
 o  6-12 Whitw.       British camera lens flange fittings, R.P.S. standard; larger sizes in 1" increment
====6-12 UN           12UN, 12-thread, primary size, constant pitch series, 12AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN (H28 1950/1957/1963); UNF continuation; originally for boiler practice, thin nuts on shafts
@   6-12 BUTT         buttress thread, 7/45°, ANSI B1.9
*   G6-11             ...see W6.45-11, W163.8x2.309, BSP pipe thread
@   6-10 UNS          SAE regular (1915/1926), UNS (H28 1963), ASME B1.1-2003 Appendix D
@   6-10 BUTT         buttress thread, 7/45°, ANSI B1.9
====6-8 UN            8UN, 8-thread, primary size, constant pitch series, 8AN, AN (NSTC 1933, H28 1942/1944), N (B1.1-1935), UN/N/UNS (H28 1957), UN (H28 1950/1963); UNC continuation; common on petrochemical fasteners, stud bolts, pipe flanges
@   6-8 BUTT          buttress thread, 7/45°, ANSI B1.9
*   6-8 NPT           ...see 6.5/8-8, M168.275x3.175
*   6-8 NPSH          ...see 6.620-8; hose thread
H   6(-6) ADMF        Admiralty Fine Thread, Whitworth, on pressure gauges and glands on engines
====6-6 UN            6UN, 6-thread, primary size, constant pitch series, UN (H28 1963)
@   6-6 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   6-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
====6-4 UN            4UN, 4-thread, primary size, constant pitch series, UN (H28 1963)
@   6-4 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   6-3 BUTT          buttress thread, 7/45°, ANSI B1.9
H   6-2.1/2           Whitworth thread proposal, 1841; as 6.000-2.5, 1857
@   6(-2.5) BSW       British Standard Whitworth; 55°; BS 84-1956; Whitworth 1841/1857; mentioned by Sellers (1864); in British Standards Interim Report 7270-1919
H   6-2.25            Sellers (1864); Sellers thread, direct precursor of UN form, standardized by Franklin Institute in 1864, later USS (United States Standard) thread
@   6-2.1/4           Sellers (1864), USS (Machinists Handbook 1909)
@   6-2               USS
H   W154x1/6" LON     Whitworth Fine Thread 2 DIN LON 287, 55°, constant pitch, historical; used in locomotive construction until about 1975
H   W154x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W154x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M155x1            DIN 13-5
 o  M155x1            astro telescopes
====M155x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M155x2            ISO extended, DIN 13-7, DIN 247 (2st), SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M155x3            ISO 261 3rd, ISO tertiary fine, BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246 (2st), SI M.MC, ISA C (1940), GOST 9150-59 constant, GOST 24705-81
    M155x3            bearing retaining locknut, "KM31", ISO 2982 (1971)
====M155x4            ISO 261 3rd, ISO tertiary fine (coarse), BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M155x6            ISO 261 3rd, ISO tertiary (coarse), BS 3643-1:1981 3rd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   S155x6            buttress thread, fine, 33°, DIN 514
L   Tr155x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd155(-4)         round/knuckle thread, DIN 405, secondary size
@   S155x16           buttress thread, coarse, 33°, DIN 513
L   Tr155x16          trapezoidal coarse, 30°, DIN 103; for leadscrews
===== 6" Cu pipe      6" 152.4mm nominal bore, 6.1/8" 155.6mm outer diameter pipe; ASTM B88 type K/0.192"/4.88mm, L/0.140"/3.56mm, M/0.122"/3.1mm; ASTM 306 copper, 0.083"/2.11mm; plumbing copper pipe in USA/Canada
===== 156mm Cu tube   156mm outer-dia tube; ASTM B88M type A/4.8mm, B/3.5mm, C/3.1mm
@   M158x1            DIN 13-5
====M158x1.5          DIN 13-6, DIN 516, SI M.ME
====M158x2            DIN 13-7, DIN 247, SI M.MD
====M158x3            DIN 13-8, DIN 246, SI M.MC
====M158x4            DIN 13-9, DIN 245, SI M.MB
@   Glasg 158(x12)    electric lighting fittings, glass lamp covers, DIN 40450; obsolete, still made by few
===== 159mm Cu tube   159mm outer-dia tube; EN 1057, wall th 2.0(X),3.0mm; BS 2871, 159.4mm outer dia, table X (wall th 2mm, 1.5 MPa), Z (1.5mm, 1.5 MPa); copper pipe in Europe
H   W159x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
====5-4 NH            6.260-4, 159.00x6.350, firehose/hydrant coupling thread, NH/NST 5"; NFPA 1963
 %  5-4 NH            firefighting, supply line hose, 5" hose (NFPA 1963 requirement)
H   W159x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M160x1            DIN 13-5
====M160x1.5          DIN 13-6, DIN 516, SI M.ME, ISA E (1940)
====M160x2            ISO extended, DIN 13-7, DIN 247 (1st), SI M.MD, ISA D (1940), GOST 9150-59 constant, GOST 24705-81
=== M160x3            common; ISO 261 1st, ISO primary fine, BS 3643-1:1981 1st constant, SI M.MC, ISA C (1940), ANSI/ASME B1.13M fine, DIN 13-8, DIN 246 (1st), GOST 9150-59 constant, GOST 24705-81
    M160x3            bearing retaining locknut, "KM32", ISO 2982 (1971)
=== M160x4            ISO 261 1st, ISO primary fine (coarse), BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, SI M.MB, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
=== M160x6            ISO 261 1st, ISO primary (coarse), BS 3643-1:1981 1st constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   S160x6            buttress thread, fine, 33°, DIN 514
@   S160x6            buttress thread, 45°, DIN 2781; on hydraulic presses
L   Tr160x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd160(-4)         round/knuckle thread, DIN 405
=== M160x8            ISO 261 1st, ISO extended, DIN 13-11
@   Rd160(x10)        round/knuckle thread, DIN 20400
 p  160x12            German bottle closure thread series; depth 4.08mm, crest radius 3.20mm, root radius 2.40mm
@   S160x16           buttress thread, coarse, 33°, DIN 513
L   Tr160x16          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M162x1            DIN 13-5
@   M162x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M162x2            DIN 13-7, DIN 247, ISA D (1940)
@   M162x3            DIN 13-8, DIN 246, ISA C (1940)
@   M162x4            DIN 13-9, DIN 245, ISA B (1940)
=== G6(-11)           W6.45-11, W163.8x2.309, BSP pipe thread; BS EN ISO 0228 (BSPP), BS 21 (BSPT)
H   W164x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W164x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M165x1            DIN 13-5
@   M165x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M165x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M165x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246 (2st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
    M165x3            bearing retaining locknut, "KM33", ISO 2982 (1971)
====M165x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M165x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   S165x6            buttress thread, fine, 33°, DIN 514
L   Tr165x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd165(-4)         round/knuckle thread, DIN 405, secondary size
@   S165x16           buttress thread, coarse, 33°, DIN 513
L   Tr165x16          trapezoidal coarse, 30°, DIN 103; for leadscrews
@%  6.5165-10         British water well casing, nominal bore 6", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 1.5/8"
 %  W6.575-8          on hydraulic pipes with outer dia approx. 6.5/8"; BSPP thread form
@   M168x1            DIN 13-5
@   M168x1.5          DIN 13-6, DIN 516
@   M168x2            DIN 13-7, DIN 247
@   M168x3            DIN 13-8, DIN 246
@   M168x4            DIN 13-9, DIN 245
====6-8NPSH           6.620-8, 6" NPSH, 168.15x3.175, firehose/hydrant coupling thread, NPSH/IPT 6"; ANSI/ASME B1.20.7
=====6" pipe          6.625 in, 6.5/8", 168.28 mm outer diameter, DN 150, NPS 6, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 150mm, ASTM copper tube 156mm, NFPA 152mm, AWWA 150mm; ASTM B42 copper B43 red brass, wall th 0.250"/6.35mm standard, 0.437"/11.1mm extra strong; ASTM B302 threadless Cu, 0.158"/4.01mm
=== NPT 6(-8)         6.5/8-8, M168.275x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909); not included in Dryseal series
@   6.5/8(-8) CSG     Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   6.5/8(-5) BTC     Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
====6.300-11 UNS      ABMA #32 locknut, NE-32, M160.0x3.31; obsolete pitch since 1930s, use 8 or 12 tpi
====6.284-8 UNS       ABMA #32 locknut, AN-32, M159.6x3.18
H   W169x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W169x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====6.690-11 UNS      ABMA #34 locknut, NE-34, M169.9x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
====6.659-8 UNS       ABMA #34 locknut, AN-34, M169.1x3.18
@   M170x1            DIN 13-5
@   M170x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M170x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M170x3            common; ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, ANSI/ASME B1.13M fine, DIN 13-8, DIN 246 (1st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
    M170x3            bearing retaining locknut, "KM34", ISO 2982 (1971)
====M170x4            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M170x6            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   S170x6            buttress thread, fine, 33°, DIN 514
@   S170x6            buttress thread, 45°, DIN 2781; on hydraulic presses
L   Tr170x6           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd170(-4)         round/knuckle thread, DIN 405
====M170x8            ISO 261 2nd, ISO extended, DIN 13-11
@   Rd170(x10)        round/knuckle thread, DIN 20400
@   S170x16           buttress thread, coarse, 33°, DIN 513
L   Tr170x16          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M172x1            DIN 13-5
@   M172x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M172x2            DIN 13-7(?), DIN 247, ISA D (1940)
@   M172x3            DIN 13-8, DIN 246, ISA C (1940)
@   M172x4            DIN 13-9, DIN 245, ISA B (1940)
 h  6.858-12          antique geodetic/surveying gear, pre-standard, male on tripod; Heller & Brightly - plane table tripod
H   W174x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W174x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M175x1            DIN 13-5
@   M175x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M175x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M175x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246 (2st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
====M175x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M175x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   Rd175(-4)         round/knuckle thread, DIN 405, secondary size
@   S175x8            buttress thread, fine, 33°, DIN 514
L   Tr175x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S175x16           buttress thread, coarse, 33°, DIN 513
L   Tr175x16          trapezoidal coarse, 30°, DIN 103; for leadscrews
@   7-10 BUTT         buttress thread, 7/45°, ANSI B1.9
@   7-8 BUTT          buttress thread, 7/45°, ANSI B1.9
@   7(-8) CSG         Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   7-6 BUTT          buttress thread, 7/45°, ANSI B1.9
@   7-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   7(-5) BTC         Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
@   7-4 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   7-3 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   7-2.5 BUTT        buttress thread, 7/45°, ANSI B1.9
@   7-2 BUTT          buttress thread, 7/45°, ANSI B1.9
@   M178x1            DIN 13-5
@   M178x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M178x2            DIN 13-7, DIN 247, ISA D (1940)
@   M178x3            DIN 13-8, DIN 246, ISA C (1940)
@   M178x4            DIN 13-9, DIN 245, ISA B (1940)
====6-4 NH            7.025-4, 178.43x6.350, firehose/hydrant coupling thread, NH/NST 6"; NFPA 1963
 %  6-4 NH            firefighting, supply line hose, 5" hose (NFPA 1963 requirement, but not commonly used in the U.S.)
 o  M179x1            astro telescopes
H   W179x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W179x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====7.082-11 UNS      ABMA #36 locknut, NE-36, M179.9x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
====7.066-8 UNS       ABMA #36 locknut, AN-36, M179.5x3.18
@   M180x1            DIN 13-5
@   M180x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M180x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
=== M180x3            common; ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, ANSI/ASME B1.13M fine, DIN 13-8, DIN 246 (1st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
    M180x3            bearing retaining locknut, "KM36", ISO 2982 (1971)
=== M180x4            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
=== M180x6            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   S180x6            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd180(-4)         round/knuckle thread, DIN 405
====M180x8            ISO 261 1st, ISO extended, DIN 13-11
@   S180x8            buttress thread, fine, 33°, DIN 514
L   Tr180x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd180(x12)        round/knuckle thread, DIN 20400
@   S180x18           buttress thread, coarse, 33°, DIN 513
L   Tr180x18          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
H   W184x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W184x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M182x1            DIN 13-5
@   M182x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M182x2            DIN 13-7, DIN 247, ISA D (1940)
@   M182x3            DIN 13-8, DIN 246, ISA C (1940)
@   M182x4            DIN 13-9, DIN 245, ISA B (1940)
@   M185x1            DIN 13-5
@   M185x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M185x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M185x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246 (1st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
====M185x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M185x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   Rd185(-4)         round/knuckle thread, DIN 405, secondary size
@   S185x8            buttress thread, fine, 33°, DIN 514
L   Tr185x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S185x18           buttress thread, coarse, 33°, DIN 513
L   Tr185x18          trapezoidal coarse, 30°, DIN 103; for leadscrews
@   M188x1            DIN 13-5
@   M188x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M188x2            DIN 13-7, DIN 247, ISA D (1940)
@   M188x3            DIN 13-8, DIN 246, ISA C (1940)
@   M188x4            DIN 13-9, DIN 245, ISA B (1940)
@   Glasg 188(x12)    electric lighting fittings, glass lamp covers, DIN 40450; obsolete, still made by few
H   W189x1/6"         Whitworth Fine Thread 2 DIN 240, 55°, historical
H   W189x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====7.472-11 UNS      ABMA #38 locknut, NE-38, M189.8x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
====7.472-8 UNS       ABMA #38 locknut, AN-38, M189.8x3.18
@   M190x1            DIN 13-5
@   M190x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M190x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M190x3            common; ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, ANSI/ASME B1.13M fine, DIN 13-8, DIN 246 (1st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
    M190x3            bearing retaining locknut, "KM38", ISO 2982 (1971)
====M190x4            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M190x6            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   S190x6            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd190(-4)         round/knuckle thread, DIN 405
====M190x8            ISO 261 2nd, ISO extended, DIN 13-11
@   S190x8            buttress thread, fine, 33°, DIN 514
L   Tr190x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd190(x12)        round/knuckle thread, DIN 20400
@   S190x18           buttress thread, coarse, 33°, DIN 513
L   Tr190x18          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M192x1            DIN 13-5
@   M192x1.5          ISA E (1940)
@   M192x2            DIN 13-7, DIN 247, ISA D (1940)
@   M192x3            DIN 13-8, DIN 246, ISA C (1940)
@   M192x4            DIN 13-9, DIN 245, ISA B (1940)
=====7" pipe          7.625 in, 7.5/8", 193.68 mm outer diameter, nominal pipe size, US standard (Machinists Handbook 1909)
@   NPT 7(-8)         7.5/8-8, M193.7x3.175; straight, NSTC 1921/1924/1928/1933; Briggs Pipe Thread (1882, Machinist Handbook 1909)
@   7.5/8(-8) CSG     Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   7.5/8(-5) BTC     Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
====7.863-11 UNS      ABMA #40 locknut, NE-40, M199.7x2.31; obsolete pitch since 1930s, use 8 or 12 tpi
====7.847-8 UNS       ABMA #40 locknut, AN-40, M199.3x3.18
H   W194x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M195x1            DIN 13-5
@   M195x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M195x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
====M195x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-8, DIN 246 (2st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
====M195x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
====M195x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   Rd195(-4)         round/knuckle thread, DIN 405, secondary size
@   S195x8            buttress thread, fine, 33°, DIN 514
L   Tr195x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S195x18           buttress thread, coarse, 33°, DIN 513
L   Tr195x18          trapezoidal coarse, 30°, DIN 103; for leadscrews
@   M198x1            DIN 13-5
@   M198x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M198x2            DIN 137(?), DIN 247, ISA D (1940)
@   M198x3            DIN 13-8, DIN 246, ISA C (1940)
@   M198x4            DIN 13-9, DIN 245, ISA B (1940)
H   W199x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M200x1            DIN 13-5
@   M200x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M200x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940), GOST 9150-59 constant, GOST 24705-81
=== M200x3            common; ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, ANSI/ASME B1.13M fine, DIN 13-8, DIN 246 (1st), ISA C (1940), GOST 9150-59 constant, GOST 24705-81
    M200x3            bearing retaining locknut, "KM40", ISO 2982 (1971)
=== M200x4            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, DIN 13-9, DIN 245, ISA B (1940), GOST 9150-59 constant, GOST 24705-81
=== M200x6            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, DIN 13-10, DIN 244, GOST 9150-59 constant, GOST 24705-81
@   Rd200(-4)         round/knuckle thread, DIN 405
====M200x8            ISO 261 1st, ISO extended, DIN 13-11
@   S200x8            buttress thread, fine, 33°, DIN 514
@   S200x8            buttress thread, 45°, DIN 2781; on hydraulic presses
L   Tr200x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd200(x12)        round/knuckle thread, DIN 20400
 p  200x12            German bottle closure thread series; depth 4.08mm, crest radius 3.20mm, root radius 2.40mm
@   S200x18           buttress thread, coarse, 33°, DIN 513
L   Tr200x18          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M202x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M202x2            DIN 13-7, DIN 247, ISA D (1940)
@   M202x3            DIN 13-8, DIN 246, ISA C (1940)
@   M202x4            DIN 13-9, DIN 245, ISA B (1940)
*   8" NPT            ...see 8.5/8-8, M215.9x3.175
===== 8" Cu tube      DN200, 203.2mm outer-diameter tube; AS 1432 wall thick 2.64mm/12g (A/green, 0.91 MPa), 2.03mm/14g (B/blue, 0.72MPa); ASTM A270 sanitary stainless, 0.109"/2.77mm
@   8-10 BUTT         buttress thread, 7/45°, ANSI B1.9
*   8-8 NPT           ...see 8.5/8-8, M215.9x3.175
@   8-8 BUTT          buttress thread, 7/45°, ANSI B1.9
@   8-6 BUTT          buttress thread, 7/45°, ANSI B1.9
@   8-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
*   8-4 NH            ...see 9.025-4
@   8-4 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   8-3 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   8-2.5 BUTT        buttress thread, 7/45°, ANSI B1.9
@   8-2 BUTT          buttress thread, 7/45°, ANSI B1.9
H   W204x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M205x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M205x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940)
====M205x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M205x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M205x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
===== 206mm Cu tube   206mm outer-dia tube; ASTM B88M type A/6.8mm, B/5.0mm, C/4.3mm
@   M208x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M208x2            DIN 13-7, DIN 247, ISA D (1940)
@   M208x3            DIN 13-8, DIN 246, ISA C (1940)
@   M208x4            DIN 13-9, DIN 245, ISA B (1940)
H   W209x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M210x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M210x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940)
====M210x3            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M210x4            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M210x6            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M210x8            ISO 261 2nd, ISO extended, DIN 13-11
@   S210x8            buttress thread, fine, 33°, DIN 514
L   Tr210x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S210x20           buttress thread, coarse, 33°, DIN 513
L   Tr210x20          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M212x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M212x2            DIN 13-7, DIN 247, ISA D (1940)
@   M212x3            DIN 13-8, DIN 246, ISA C (1940)
@   M212x4            DIN 13-9, DIN 245, ISA B (1940)
@   S212x8            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd212(x12)        round/knuckle thread, DIN 20400
H   W214x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M215x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M215x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M215x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M215x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M215x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
=====8" pipe          8.625 in, 8.5/8", 219.08 mm outer diameter, DN 200, NPS 8, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 200mm, ASTM copper tube 206mm, NFPA 203mm, AWWA 200mm; ASTM B42 copper B43 red brass, wall th 0.312"/7.92mm standard, 0.500"/12.7mm extra strong; ASTM B302 threadless Cu, 0.205"/5.21mm
=== NPT 8(-8)         8.5/8-8, M215.9x3.175, IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series
@   8.5/8(-8) CSG     Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@%  8.5003-8          British water well casing, nominal bore 8", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 2.1/8"
@   8.5/8(-5) BTC     Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
@   M218x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M218x2            DIN 13-7, DIN 247, ISA D (1940)
@   M218x3            DIN 13-8, DIN 246, ISA C (1940)
@   M218x4            DIN 13-9, DIN 245, ISA B (1940)
===== 219mm Cu tube   219mm outer-dia tube; EN 1057, wall th 3.0(X)mm
H   W219x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====8.628-8 UNS       ABMA #44 locknut, N-40, M219.2x3.18
@   M220x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M220x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940)
=== M220x3            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
=== M220x4            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
    M220x4            bearing retaining locknut, "KM44", ISO 2982 (1971)
=== M220x6            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M220x8            ISO 261 1st, ISO extended, DIN 13-11
@   S220x8            buttress thread, fine, 33°, DIN 514
L   Tr220x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S220x20           buttress thread, coarse, 33°, DIN 513
L   Tr220x20          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M222x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M222x2            DIN 13-7, DIN 247, ISA D (1940)
@   M222x3            DIN 13-8, DIN 246, ISA C (1940)
@   M222x4            DIN 13-9, DIN 245, ISA B (1940)
H   W224x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S224x8            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd224(x12)        round/knuckle thread, DIN 20400
@   M225x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M225x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940)
====M225x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M225x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M225x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M228x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M228x2            DIN 13-7(?), DIN 247, ISA D (1940)
@   M228x3            DIN 13-8, DIN 246, ISA C (1940)
@   M228x4            DIN 13-9, DIN 245, ISA B (1940)
@   9-10 BUTT         buttress thread, 7/45°, ANSI B1.9
@   9-8 BUTT          buttress thread, 7/45°, ANSI B1.9
@   9-6 BUTT          buttress thread, 7/45°, ANSI B1.9
@   9-5 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   9-4 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   9-3 BUTT          buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   9-2.5 BUTT        buttress thread, 7/45°, ANSI B1.9
@   9-2 BUTT          buttress thread, 7/45°, ANSI B1.9
H   W229x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====8-4 NH            9.025-4, 229.23x6.350, firehose/hydrant coupling thread, NH/NST 8"; NFPA 1963
 %  8-4 NH            firefighting, supply line hose, 5" hose (NFPA 1963 requirement, but not commonly used in the U.S.; only added to NFPA 1963 in the 2003 edition)
@   M230x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M230x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940)
====M230x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M230x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M230x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M230x8            ISO 261 3rd, DIN 13-11
@   S230x8            buttress thread, fine, 33°, DIN 514
L   Tr230x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S230x20           buttress thread, coarse, 33°, DIN 513
L   Tr230x20          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M232x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M232x2            DIN 13-7, DIN 247, ISA D (1940)
@   M232x3            DIN 13-8, DIN 246, ISA C (1940)
@   M232x4            DIN 13-9, DIN 245, ISA B (1940)
H   W234x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M235x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M235x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M235x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M235x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M235x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   S236x8            buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd236(x16)        round/knuckle thread, DIN 20400
@   M238x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M238x2            DIN 13-7, DIN 247, ISA D (1940)
@   M238x3            DIN 13-8, DIN 246, ISA C (1940)
@   M238x4            DIN 13-9, DIN 245, ISA B (1940)
H   W239x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====9.442-6 UNS       ABMA #48 locknut, N-48, M239.3x4.23
@   M240x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M240x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940)
====M240x3            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M240x4            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
    M240x4            bearing retaining locknut, "KM48", ISO 2982 (1971)
====M240x6            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M240x8            ISO 261 2nd, ISO extended, DIN 13-11
@   S240x8            buttress thread, fine, 33°, DIN 514
L   Tr240x8           trapezoidal fine, 30°, DIN 103; for leadscrews
@   S240x22           buttress thread, coarse, 33°, DIN 513
L   Tr240x22          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M242x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M242x2            DIN 13-7, DIN 247, ISA D (1940)
@   M242x3            DIN 13-8, DIN 246, ISA C (1940)
@   M242x4            DIN 13-9, DIN 245, ISA B (1940)
H   W244x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
=====9" pipe          9.625 in, 9.5/8", 244.48mm outer diameter, nominal pipe size, US standard (Machinists Handbook 1909) (formerly 9.688 in, 9.11/16", 246.06mm, changed to 9.5/8 by manufacturers of wrought iron and boiler tubes at a meeting in New York, May 9 1889)
@   NPT 9(-8)         9.5/8-8, M244.5x3.175; straight, NSTC 1921/1924/1928/1933; Briggs Pipe Thread (1882, Machinist Handbook 1909)
@   9.5/8(-8) CSG     Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   9.5/8(-5) BTC     Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
@   M245x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M245x2            ISO extended, DIN 13-7, DIN 247 (2st), ISA D (1940)
====M245x3            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M245x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M245x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M248x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M248x2            DIN 13-7, DIN 247, ISA D (1940)
@   M248x3            DIN 13-8, DIN 246, ISA C (1940)
@   M248x4            DIN 13-9, DIN 245, ISA B (1940)
H   W249x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M250x1.5          DIN 13-6, DIN 516, ISA E (1940)
====M250x2            ISO extended, DIN 13-7, DIN 247 (1st), ISA D (1940)
=== M250x3            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
=== M250x4            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
=== M250x6            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M250x8            ISO 261 1st, ISO extended, DIN 13-11
@   S250x8            buttress thread, 45°, DIN 2781; on hydraulic presses
@   S250x12           buttress thread, fine, 33°, DIN 514
L   Tr250x12          trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd250(x16)        round/knuckle thread, DIN 20400
L   Tr250x22          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   S250x22           buttress thread, coarse, 33°, DIN 513
@   M252x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M252x2            DIN 13-7, DIN 247, ISA D (1940)
@   M252x3            DIN 13-8, DIN 246, ISA C (1940)
@   M252x4            DIN 13-9, DIN 245, ISA B (1940)
*   10" NPT           ...see 10.3/4-8, M273.1x3.175
@   10-10 BUTT        buttress thread, 7/45°, ANSI B1.9
*   10-8 NPT          ...see 10.3/4-8, M273.1x3.175
@   10-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   10-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   10-5 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   10-4 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   10-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   10-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   10-2 BUTT         buttress thread, 7/45°, ANSI B1.9
H   W254x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M255x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M255x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M255x3            GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M255x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M255x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
===== 257mm Cu tube   257mm outer-dia tube; ASTM B88M type A/8.5mm, B/6.3mm, C/5.4mm
@   M258x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M258x2            DIN 13-7, DIN 247, ISA D (1940)
@   M258x3            DIN 13-8, DIN 246, ISA C (1940)
@   M258x4            DIN 13-9, DIN 245, ISA B (1940)
====10.192-6 UNS      ABMA #52 locknut, N-52, M258.9x4.23
H   W259x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M260x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M260x2            DIN 13-7, DIN 247 (1st), ISA D (1940)
====M260x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M260x4            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
    M260x4            bearing retaining locknut, "KM52", ISO 2982 (1971)
====M260x6            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M260x8            ISO 261 2nd, ISO extended, DIN 13-11
@   S260x12           buttress thread, fine, 33°, DIN 514
L   Tr260x12          trapezoidal fine, 30°, DIN 103; for leadscrews
@   S260x22           buttress thread, coarse, 33°, DIN 513
L   Tr260x22          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M262x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M262x2            DIN 13-7, DIN 247, ISA D (1940)
@   M262x3            DIN 13-8, DIN 246, ISA C (1940)
@   M262x4            DIN 13-9, DIN 245, ISA B (1940)
H   W264x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M265x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M265x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M265x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M265x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M265x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   S265x10           buttress thread, 45°, DIN 2781; on hydraulic presses
@   Rd265(x16)        round/knuckle thread, DIN 20400
===== 268mm Cu tube   268mm outer-dia tube; EN 1057, wall th 3.0mm
@   M268x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M268x2            DIN 13-7, DIN 247, ISA D (1940)
@   M268x3            DIN 13-8, DIN 246, ISA C (1940)
@   M268x4            DIN 13-9, DIN 245, ISA B (1940)
H   W269x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@%  10.6251-8         British water well casing, nominal bore 10", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 2.5/8"
@   M270x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M270x2            DIN 13-7, DIN 247 (1st), ISA D (1940)
====M270x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M270x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M270x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M270x8            ISO 261 3rd, DIN 13-11
@   S270x12           buttress thread, fine, 33°, DIN 514
L   Tr270x12          trapezoidal fine, 30°, DIN 103; for leadscrews
@   S270x24           buttress thread, coarse, 33°, DIN 513
L   Tr270x24          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M272x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M272x2            DIN 13-7, DIN 247, ISA D (1940)
@   M272x3            DIN 13-8, DIN 246, ISA C (1940)
@   M272x4            DIN 13-9, DIN 245, ISA B (1940)
=====10" pipe         10.75 in, 10.3/4", 273.05 mm outer diameter, DN 250, NPS 10, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 250mm, ASTM copper tube 257mm, AWWA 250mm; ASTM B42 copper B43 red brass, wall th 0.365"/9.27mm standard, 0.500"/12.7mm extra strong; ASTM B302 threadless Cu, 0.256"/6.5mm
=== NPT 10(-8)        10.3/4-8, M273.1x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; Briggs Pipe Thread (1882, Machinist Handbook 1909); not included in Dryseal series
@   10.3/4(-8) CSG    Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   10.3/4(-5) BTC    Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
H   W274x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M275x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M275x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M275x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M275x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M275x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M278x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M278x2            DIN 13-7, DIN 247, ISA D (1940)
@   M278x3            DIN 13-8, DIN 246, ISA C (1940)
@   M278x4            DIN 13-9, DIN 245, ISA B (1940)
H   W279x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   11-10 BUTT        buttress thread, 7/45°, ANSI B1.9
@   11-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   11-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   11-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   11-4 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   11-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   11-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   11-2 BUTT         buttress thread, 7/45°, ANSI B1.9
@   11-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   11-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
====11.004-6 UNS      ABMA #56 locknut, N-56, M279.5x4.23
@   M280x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M280x2            DIN 13-7, DIN 247 (1st), ISA D (1940)
====M280x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
=== M280x4            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
    M280x4            bearing retaining locknut, "KM56", ISO 2982 (1971)
=== M280x6            ISO 261 1st, ISO primary, BS 3643-1:1981 1st constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M280x8            ISO 261 1st, ISO extended, DIN 13-11
@   S280x10           buttress thread, 45°, DIN 2781; on hydraulic presses
@   S280x12           buttress thread, fine, 33°, DIN 514
L   Tr280x12          trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd280(x16)        round/knuckle thread, DIN 20400
@   S280x24           buttress thread, coarse, 33°, DIN 513
L   Tr280x24          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M282x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M282x2            DIN 13-7, DIN 247, ISA D (1940)
@   M282x3            DIN 13-8, DIN 246, ISA C (1940)
@   M282x4            DIN 13-9, DIN 245, ISA B (1940)
H   W284x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M285x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M285x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M285x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M285x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M285x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M288x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M288x2            DIN 13-7, DIN 247, ISA D (1940)
@   M288x3            DIN 13-8, DIN 246, ISA C (1940)
@   M288x4            DIN 13-9, DIN 245, ISA B (1940)
H   W289x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M290x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M290x2            DIN 13-7, DIN 247 (1st), ISA D (1940)
====M290x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M290x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M290x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M290x8            ISO 261 3rd, DIN 13-11
@   S290x12           buttress thread, fine, 33°, DIN 514
L   Tr290x12          trapezoidal fine, 30°, DIN 103; for leadscrews
@   S290x24           buttress thread, coarse, 33°, DIN 513
L   Tr290x24          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
@   M292x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M292x2            DIN 13-7, DIN 247, ISA D (1940)
@   M292x3            DIN 13-8, DIN 246, ISA C (1940)
@   M292x4            DIN 13-9, DIN 245, ISA B (1940)
H   W294x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   M295x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M295x2            DIN 13-7, DIN 247 (2st), ISA D (1940)
====M295x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (2st), ISA C (1940)
====M295x4            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
====M295x6            ISO 261 3rd, ISO tertiary, BS 3643-1:1981 3rd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M298x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M298x2            DIN 13-7, DIN 247, ISA D (1940)
@   M298x3            DIN 13-8, DIN 246, ISA C (1940)
@   M298x4            DIN 13-9, DIN 245, ISA B (1940)
@   NPT 11(-8)        11.3/4-8, M298.4x3.175; straight, NSTC 1921/1924/1928/1933
@   11.3/4(-8) CSG    Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   11.3/4(-5) BTC    Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
H   W299x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====11.785-6 UNS      ABMA #60 locknut, N-60, M299.3x4.23
@   M300x1.5          DIN 13-6, DIN 516, ISA E (1940)
@   M300x2            DIN 13-7, DIN 247 (1st), ISA D (1940)
====M300x3            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-8, DIN 246 (1st), ISA C (1940)
====M300x4            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-9, DIN 245, ISA B (1940)
    M300x4            bearing retaining locknut, "KM60", ISO 2982 (1971)
====M300x6            ISO 261 2nd, ISO secondary, BS 3643-1:1981 2nd constant, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
====M300x8            ISO 261 2nd, ISO extended, DIN 13-11
@   S300x10           buttress thread, 45°, DIN 2781; on hydraulic presses
@   S300x12           buttress thread, fine, 33°, DIN 514
L   Tr300x12          trapezoidal fine, 30°, DIN 103; for leadscrews
@   Rd300(x16)        round/knuckle thread, DIN 20400
@   S300x24           buttress thread, coarse, 33°, DIN 513
L   Tr300x24          trapezoidal coarse, 30°, DIN 103, preferred basic size; for leadscrews
H   W304x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
*   12" NPT           ...see 12.3/4-8, M323.85x3.175
@   12-10 BUTT        buttress thread, 7/45°, ANSI B1.9
*   12-8 NPT          ...see 12.3/4-8, M323.85x3.175
@   12-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   12-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   12-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   12-4 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   12-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   12-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   12-2 BUTT         buttress thread, 7/45°, ANSI B1.9
@   12-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   12-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
===== 308mm Cu tube   308mm outer-dia tube; ASTM B88M type A/10.3mm, B/7.1mm, C/6.4mm
H   W309x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M310x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M310x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
H   W314x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S315x10           buttress thread, 45°, DIN 2781; on hydraulic presses
H   W319x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====12.562-6 UNS      ABMA #64 locknut, N-64, M319.1x4.23
====M320x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
    M320x5            bearing retaining locknut, "KM64", ISO 2982 (1971)
====M320x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M320x8            DIN 13-11
@   S320x12           buttress thread, fine, 33°, DIN 514
@%  12.6251-8         British water well casing, nominal bore 12", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 2.5/8"
=====12" pipe         12.75 in, 12.3/4", 323.85 mm outer diameter, DN 300, NPS 12, nominal pipe size, US standard, ANSI/ASME B36; ASHRAE 300mm, ASTM copper tube 308mm, NFPA 305mm, AWWA 300mm; ASTM B42 copper B43 red brass, wall th 0.375"/9.52mm standard; ASTM B302 threadless Cu, 0.313"/7.95mm
=== NPT 12(-8)        12.3/4-8, M323.85x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series
H   W324x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W329x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M330x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M330x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
H   W334x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S335x12           buttress thread, 45°, DIN 2781; on hydraulic presses
====13.303-5 ACME     ABMA #68 locknut, N-68, 337.9x5.08
H   W339x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   13.3/8(-8) CSG    Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   13.3/8(-5) BTC    Buttress Thread Casing (BTC),  taper 1:16, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
====M340x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
    M340x5            bearing retaining locknut, "KM68", ISO 2982 (1971)
====M340x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M340x8            DIN 13-11
@   S340x12           buttress thread, fine, 33°, DIN 514
H   W344x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W349x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M350x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M350x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@%  13.8749-8         British water well casing, nominal bore 13", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 3.1/8"
H   W354x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S355x12           buttress thread, 45°, DIN 2781; on hydraulic presses
=====14" pipe         14.00 in, 355.6 mm outer diameter, DN 350, NPS 14, nominal pipe size, US standard, ANSI/ASME B36; AWWA 350mm
@   14-10 BUTT        buttress thread, 7/45°, ANSI B1.9
=== NPT 14(-8)        14-8, NPT 14 OD, M355.6x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series
@   14-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   14-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   14-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   14-4 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   14-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   14-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   14-2 BUTT         buttress thread, 7/45°, ANSI B1.9
@   14-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   14-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
====14.134-5 ACME     ABMA #72 locknut, N-72, 359x5.08
H   W359x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M360x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
    M360x5            bearing retaining locknut, "KM72", ISO 2982 (1971)
====M360x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M360x8            DIN 13-11
@   S360x12           buttress thread, fine, 33°, DIN 514
H   W364x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W369x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M370x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M370x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
H   W374x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S375x12           buttress thread, 45°, DIN 2781; on hydraulic presses
====14.921-5 ACME     ABMA #76 locknut, N-76, 379x5.08
H   W379x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M380x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M380x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M380x8            DIN 13-11
@   S380x12           buttress thread, fine, 33°, DIN 514
@   NPT 15(-8)        15-8, NPT 15 OD; straight, NSTC 1921/1924/1928/1933
H   W384x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W389x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M390x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M390x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
H   W394x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====15.709-5 ACME     ABMA #80 locknut, N-80, 399x5.08
H   W399x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M400x4            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M400x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M400x8            DIN 13-11
@   S400x12           buttress thread, fine, 33°, DIN 514
@   S400x16           buttress thread, 45°, DIN 2781; on hydraulic presses
@%  15.8749-8         British water well casing, nominal bore 15", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 3.1/8"
H   W404x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
=====16" pipe         16.00 in, 406.4 mm outer diameter, DN 400, NPS 16, nominal pipe size, US standard, ANSI/ASME B36; AWWA 400mm
@   16-10 BUTT        buttress thread, 7/45°, ANSI B1.9
=== NPT 16(-8)        16-8, NPT 16 OD, M406.4x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series
@   16-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   16(-8) CSG        Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   16-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   16-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   16(-5) BTC        Buttress Thread Casing (BTC),  taper 1:12, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
@   16-4 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   16-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   16-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   16-2 BUTT         buttress thread, 7/45°, ANSI B1.9
@   16-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   16-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
H   W409x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M410x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
H   W414x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W419x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====16.495-5 ACME     ABMA #84 locknut, N-84, 419x5.08
====M420x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M420x8            DIN 13-11
@   S420x18           buttress thread, fine, 33°, DIN 514
H   W424x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S425x16           buttress thread, 45°, DIN 2781; on hydraulic presses
H   W429x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M430x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   NPT 17(-8)        17-8, NPT 17 OD; straight, NSTC 1921/1924/1928/1933
H   W434x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W439x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====17.283-5 ACME     ABMA #88 locknut, N-88, 439x5.08
====M440x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M440x8            DIN 13-11
@   S440x18           buttress thread, fine, 33°, DIN 514
H   W444x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W449x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M450x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   S450x16           buttress thread, 45°, DIN 2781; on hydraulic presses
H   W454x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
=====18" pipe         18.00 in, 457.2 mm outer diameter, DN 450, NPS 18, nominal pipe size, US standard, ANSI/ASME B36
=== NPT 18(-8)        18-8, NPT 18 OD, M457.2x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series
@   18-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   18-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   18-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   18-4 BUTT         buttress thread, 7/45°, ANSI B1.9
@   18-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   18-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   18-2 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   18-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   18-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
@   18-1 BUTT         buttress thread, 7/45°, ANSI B1.9
H   W459x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M460x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M460x8            DIN 13-11
@   S460x18           buttress thread, fine, 33°, DIN 514
H   W464x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W469x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M470x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   18.5/8(-8) CSG    Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   18.5/8(-5) BTC    Buttress Thread Casing (BTC),  taper 1:12, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
H   W474x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@   S475x16           buttress thread, 45°, DIN 2781; on hydraulic presses
H   W479x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
@%  18.8749-8         British water well casing, nominal bore 18", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 3.1/8"
====M480x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M480x8            DIN 13-11
@   S480x18           buttress thread, fine, 33°, DIN 514
H   W484x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W489x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M490x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
H   W494x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
H   W499x1/4"         Whitworth Fine Thread 1 DIN 239, 55°, constant pitch, historical
====M500x6            ISO extended, GOST 9150-59 constant, GOST 24705-81, DIN 13-10, DIN 244
@   M500x8            DIN 13-11
@   S500x16           buttress thread, 45°, DIN 2781; on hydraulic presses
@   S500x18           buttress thread, fine, 33°, DIN 514
=====20" pipe         20.00 in, 508 mm outer diameter, DN 500, NPS 20, nominal pipe size, US standard, ANSI/ASME B36; AWWA 500mm
=== NPT 20(-8)        20-8, NPT 20 OD, M508x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; LP, line pipe; not included in Dryseal series
@   20-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   20(-8) CSG        Round Thread Casing (8rd-CSG), taper 1:16, American Petroleum Institute API SPEC 5B, rounded 60°
@   20-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   20-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   20(-5) BTC        Buttress Thread Casing (BTC),  taper 1:12, American Petroleum Institute API SPEC 5B, buttres 3/10°, rounded 10° edge
@   20-4 BUTT         buttress thread, 7/45°, ANSI B1.9
@   20-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   20-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   20-2 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   20-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   20-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
@   20-1 BUTT         buttress thread, 7/45°, ANSI B1.9
====M510x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M520x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@   M520x8            DIN 13-11
@   S520x24           buttress thread, fine, 33°, DIN 514
====M530x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@   S530x20           buttress thread, 45°, DIN 2781; on hydraulic presses
====M540x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@   M540x8            DIN 13-11
@   S540x24           buttress thread, fine, 33°, DIN 514
====M550x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@%  21.8437-8         British water well casing, nominal bore 21", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 3.5/8"
=====22" pipe         22.00 in, 558.8 mm outer diameter, DN 550, NPS 22, nominal pipe size, US standard, ANSI/ASME B36
@   NPT 22(-8)        22-8, NPT 22 OD; straight, NSTC 1921/1924/1928/1933
@   22-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   22-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   22-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   22-4 BUTT         buttress thread, 7/45°, ANSI B1.9
@   22-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   22-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   22-2 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   22-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   22-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
@   22-1 BUTT         buttress thread, 7/45°, ANSI B1.9
====M560x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@   M560x8            DIN 13-11
@   S560x20           buttress thread, 45°, DIN 2781; on hydraulic presses
@   S560x24           buttress thread, fine, 33°, DIN 514
====M570x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M580x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@   M580x8            DIN 13-11
@   S580x24           buttress thread, fine, 33°, DIN 514
====M590x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
====M600x6            ISO extended, GOST 9150-59 constant, GOST 24705-81
@   M600x8            DIN 13-11
@   S600x20           buttress thread, 45°, DIN 2781; on hydraulic presses
@   S600x24           buttress thread, fine, 33°, DIN 514
=====24" pipe         24.00 in, 609.6 mm outer diameter, DN 600, NPS 24, nominal pipe size, US standard, ANSI/ASME B36; AWWA 600mm
=== NPT 24(-8)        24-8, NPT 24 OD, M609.6x3.175; IP/IPS/NPS/NPSM straight; NPT with 1:16 taper; NSTC 1921/1924/1928/1933, H28 1942/1944; not included in API Line Pipe series; not included in Dryseal series
@   24-8 BUTT         buttress thread, 7/45°, ANSI B1.9
@   24-6 BUTT         buttress thread, 7/45°, ANSI B1.9
@   24-5 BUTT         buttress thread, 7/45°, ANSI B1.9
@   24-4 BUTT         buttress thread, 7/45°, ANSI B1.9
@   24-3 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   24-2.5 BUTT       buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   24-2 BUTT         buttress thread, 7/45°, ANSI B1.9, preferred size-pitch
@   24-1.5 BUTT       buttress thread, 7/45°, ANSI B1.9
@   24-1.25 BUTT      buttress thread, 7/45°, ANSI B1.9
@   24-1 BUTT         buttress thread, 7/45°, ANSI B1.9
@   M620x8            DIN 13-11
@   S630x20           buttress thread, 45°, DIN 2781; on hydraulic presses
@%  24.8437-8         British water well casing, nominal bore 24", taper 3/16 in/ft, Whitworth, thread diameter at gauge length 3.5/8"
@   M640x8            DIN 13-11
@   M660x8            DIN 13-11
@   NPT 26(-8)        26-8, NPT 26 OD; straight, NSTC 1921/1924/1928/1933
@   S670x24           buttress thread, 45°, DIN 2781; on hydraulic presses
@   M680x8            DIN 13-11
@   M700x8            DIN 13-11
@   S710x24           buttress thread, 45°, DIN 2781; on hydraulic presses
@   NPT 28(-8)        28-8, NPT 28 OD; straight, NSTC 1921/1924/1928/1933
@   M720x8            DIN 13-11
@   M740x8            DIN 13-11
@   S750x24           buttress thread, 45°, DIN 2781; on hydraulic presses
@   M760x8            DIN 13-11
@   NPT 30(-8)        30-8, NPT 30 OD; straight, NSTC 1921/1924/1928/1933
@   M780x8            DIN 13-11
@   M800x8            DIN 13-11
@   S800x32           buttress thread, 45°, DIN 2781; on hydraulic presses
@   M820x8            DIN 13-11
@   M840x8            DIN 13-11
@   S850x32           buttress thread, 45°, DIN 2781; on hydraulic presses
@   M860x8            DIN 13-11
@   M880x8            DIN 13-11
@   M900x8            DIN 13-11
@   S900x32           buttress thread, 45°, DIN 2781; on hydraulic presses
@   M920x8            DIN 13-11
@   M940x8            DIN 13-11
@   S950x32           buttress thread, 45°, DIN 2781; on hydraulic presses
@   M960x8            DIN 13-11
@   M980x8            DIN 13-11
@   M1000x8           DIN 13-11
@   S1000x32          buttress thread, 45°, DIN 2781; on hydraulic presses
====M1060x8
@   S1060x40          buttress thread, 45°, DIN 2781; on hydraulic presses
@   S1120x40          buttress thread, 45°, DIN 2781; on hydraulic presses
@   S1180x40          buttress thread, 45°, DIN 2781; on hydraulic presses
@   S1250x40          buttress thread, 45°, DIN 2781; on hydraulic presses


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