Thread types

Thread types

SymbolAngleParallel/taperedStandardDescriptionApplication
A/B60°ParallelDIN 4503, ISO 1222Tripod connection threadConnections to photografic equipment.
ACME-C29°ANSI B1.5 (1977)Acme thread centralizing
ACME-G29°ANSI B1.5 (1977)Acme thread general purpose
AMO55°ANSI B1.11 (1958)American standard microscope objective thread
ANPT60°MIL-P-7105Aeronautical national form taper pipe thread
API60°American national taper form thread for petroleum installations
BA47°30'BS93 (1951)British association thread
BSC60°BS811 (1950)British norm thread for bicycles
BSF55°ParallelBS84 (1956)Whithworth fine thread
BSW55°ParallelBS84 (1956)Whithworth coarse thread
E-DIN 40400, DIN 49612, DIN 49610, DIN 49625Edison form threadElectrical thread.
EG M60°ParallelDIN 8140-2Metric ISO thread for helical coil wire screw thread insertsFor wire thread inserts.
EG-UNC60°ParallelMS 33537Unified coarse thread series for helical coil wire screw thread inserts
EG-UNF60°ParallelASME B18.29.1Unified fine thread for helical coil wire screw thread inserts
FG60°ParallelDIN 79012Bicycle threadFor cycles and motor-scooters.
G55°ParallelDIN ISO 228, DIN 6630Pipe parallel ISO threadFor pressure tight joints are not made on the thread. External and internal pipe thread. Packaging; external thread for barrels.
G55°ParallelBS2779 (1973)Pipe whitworth thread (BSP)parallel
GfTaperedDIN 4930Round tapered threadTubes and tunneling
Gg60°Tapered (1:16)DIN 4941Tapered threadFor drill pipes in water and rock drilling, mining.
Gg30°-30°Tapered (1:4)DIN 20314Tapered threadFor drill pipes in water and rock drilling, mining.
GL30°-60°ParallelDIN 168-1Cylindrical round threadFor glass containers.
Glasg30°-50°ParallelDIN 40450Glasg thread for glassElectric industry: glass fittings, protection glasses.
HA-HBDIN 58810Bone screw threadFor surgical implants, external and internal thread.
KT20°ParallelDIN 6063Trapezoidal threadPreferably for packages made of plastics.
LN60°ParallelLN 9163, EN 2158ISO Metric thread for aviationAviation and aerospace.
M60°ParallelDIN 13, DIN 14, ISO 68, DIN 6630, LN 9163, DIN 2510Metric coarse ISO threadGeneral engineering, watches, fine work, packaging; external thread for barrels, aviation, aerospace and bolted connections with reduced shank.
M60°Tapered (1:16)DIN 158Taper metric ISO threadPlugs and grease nipples.
MF60°ParallelDIN 13, DIN EN 60423Metric fine ISO thread
MFS60°ParallelDIN 8141-1ISO Metric thread for tight fit
MJ60°ParallelDIN ISO 5855Metric ISO thread for aeronauticsAviation and aerospace.
N60°ANSI B1.1 (1960)American national 8-12-16 TPI pitch series (8N, 12N, 16N)
N-BUTT45°+5°ANSI B1.9 (1973)American BUTTRESS thread
NC60°ANSI B1.1 (1960)American national coarse thread series
NEF60°ANSI B1.1 (1960)American national extra fine thread series
NF60°ANSI B1.1 (1960)American national fine thread series
NGO60°ANSI/ASME-B1.20.1 (1983)National gas outlet thread (specify RH or LH)
NGS60°ANSI/ASME-B1.20.1 (1983)National gas straight thread
NGT60°ANSI B57.1 (1977)National gas taper thread (see also SGT)
NH60°ANSI B2.4 H28 (1966)American national firehouse and hose coupling thread
NPS60°American standard straight pipe thread NSPC & NPSM
NPSC60°ANSI/ASME-B1.20.1 (1983)American standard straight pipe thread in pipe couplings (marked NPS)
NPSF60°ANSI B1.20.3 (1976)Dryseal American standard internal straight pipe thread (fuel)
NPSH60°ANSI/ASME-B1.20.1 (1983)American standard straight pipe thread for hose couplings
NPSI60°ANSI B1.20.3 (1976)American standard intermediate internal straight pipe thread
NPSL60°ANSI/ASME-B1.20.1 (1983)American standard straight pipe thread for loose-fitting mechanical joints
NPSM60°ANSI/ASME-B1.20.1 (1983)American standard straight pipe thread for free-fitting mechanical joints
NPT60°Tapered (1:16)ANSI/ASME-B1.20.1 (1983)American standard tapered pipe thread For threads with dryseal material.
NPTF60°Tapered (1:16)ANSI B1.20.3 (1976)American standard tapered pipe thread (fuel)For threads without dryseal material.
NPTR60°ANSI/ASME-B1.20.1 (1983)American standard taper pipe thread for railing joints (tap market NPT)
NS60°ANSI B1.1 (1960)American national thread special pitches
Pg80°ParallelDIN 40430Steel electrical conduit threadFor electric installations.
PTF60°ANSI B1.20.1 (1976) Dryseal SAE short taper pipe thread
R55°ParallelDIN 259Pipe parallel whitworth threadFor pressure tight joints are not made on the thread. Piping, do not use in new designs.
R55°Tapered (1:16)BS21 (1985), DIN EN 10226-1, ISO 7-1, DIN 2999, DIN 3858External dryseal pipe taper thread (BSPT)Tapered Whitworth pipe thread where pressure-tight joints are made on the threads.
Rc55°Tapered (1:16)BS21 (1985), DIN EN 10226-1, ISO 7-1Internal dryseal pipe taper thread (BSPT)Tapered Whitworth pipe thread where pressure-tight joints are made on the threads.
Rd30°ParallelDIN 405, DIN 20400, DIN 15403, DIN 7273Rounded threadGeneral, for mining industry, for lifting hooks, for steel sheet items and related joints.
RMS55°ParallelDIN 58888RMS-threadObjective for microscope.
Rp55°ParallelDIN 2999, DIN 3858Internal dryseal parallel threadInternal thread for pipes and fittings.
Rp55°ParallelBS21 (1973), DIN EN 10226-1, ISO 7-1Pipe parallel thread (BSPP)Cylindrical Whitworth pipe thread where pressure-tight joints are made on the threads.
S30°+3°ParallelDIN 513, DIN 20401Saw form threadGeneral. Mining industry.
S45°ParallelDIN 2781Saw form threadFor machine tools, hydraulic presses.
S105°Tapered (7°30')DIN 71412Self forming taper external threadTaper lubricating nipple. Similar to DIN 158 but 105° thread angle.
SBManufacturers stovebolt standards thread
SGT60°ANSI B57.1 (1977)Special gas taper thread
SPL-PTF60°ANSI B1.20.3 (1976)Dryseal special taper pipe thread
ST60°ParallelDIN 7970, DIN EN ISO 1478Sheet metal screw threadFor tapping screws.
STI60°Special thread for helical coil wire screw thread inserts
STUB-ACME29°ANSI B1.8 (1977)Stub Acme thread
Tr30°ParallelDIN 103, DIN 380, DIN 263, DIN 6341, DIN 30295Trapezoidal threadGeneral, for rail vehicles, for collet chucks.
UN60°ANSI B1.1 (1982)Unified 8-12-16 TPI pitch series
UN-860°ASME B1.1Unified thread for special diameters and pitches
UNC60°ANSI B1.1 (1982)Unified coarse thread series
UNEF60°ANSI B1.1 (1982)Unified extra fine thread series
UNF60°ANSI B1.1 (1982)Unified fine thread series
UNJ60°BS 4048 (1978)Unified constant pitch with a 0,15011P to 0,18042P controlled root radius
UNJC60°BS 4048 (1978), ASME B1.15Unified coarse thread with a 0,15011P to 0,18042P controlled root radius
UNJEF60°BS 4048 (1978)Unified extra fine thread with a 0,15011P to 0,18042P controlled root radius
UNJF60°BS 4048 (1978), ASME B1.15Unified fine thread with a 0,15011P to 0,18042P controlled root radius
UNM60°ASA B1.10 (1958)Unified miniature thread series
UNS60°ANSI B1.1 (1982)Unified thread special pitches
V60°60° "V" thread with truncated crest and root(flatted to the user's specifications)
Vg60°ParallelDIN 7756Valves threadValves for tires.
W55°ParallelDIN 477Parallel whitworth threadCylindrical thread for side connections.
W keg55°Tapered (3:25)DIN 477, DIN EN 144-1, DIN EN 629-1, DIN EN ISO 11116-1Tapered thread for screw socketsGas cylinders, thread for side nozzles.

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