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TAPS Thread Standards USER GUIDE

Cylindrical Threads Taper Pipe Threads
UNC Unified coarse thread series NPT Taper pipe threads
UNF Unified fine thread series NPTF Taper pipe threads (dryseal)
UNEF Unified extra-fine thread series NPTR Taper pipe threads for railway equipment
UN Constant pitch series - threads with constant PTF-SAE SHORT Taper pipe short threads (dryseal)-SAE
pitch of T.P.I. 4, 6, 8, 12, 16, 20, 28, 32 PTF-SPL Taper pipe special threads (dryseal)-SAE
UNS Selected combinations - threads with SHORT
special dia. - pitch combinations PTF-SPL EXTRA Extra short special threads (dryseal)-SAE
UNJ Unified threads with constant pitch with radius on SHORT
minor diameter from 0.15011 pitch to 0.18042 pitch SPL-PTF Special taper pipe dryseal threads
UNJC Unified coarse thread with radius on minor NGT National American taper pipe threads
diameter from 0.15011 pitch to 0.18042 pitch SGT Special taper pipe threads
UNJEF Unified extra-fine thread with radius on minor API American Petroleum Institute
diameter from 0.15011 pitch to 0.18042 pitch taper pipe threads
UNJF Unified fine threads with radius on minor
diameter from 0.15011 pitch to 0.18042 pitch
Trapezoidal and Saw Tooth Threads
ACME-C ACME Self-centering threads
Pipe Cylindrical Threads ACME-G ACME Generical application
NPS Cylindrical threads for pipe STUB-ACME ACME Flat threads with
NPSC American Standard for pipe coupling reduced thread depth
NPSF American Standard for internal 60º STUB-ACME ACME Flat threads with 60º flank angle
threads on pipe, dryseal N BUTT American National Saw tooth threads
NPSH American Standard for cylindrical threads
for pipes, joints and nipples
NPSI American Standard for internal cylindrical British Standard
threads on pipe (dryseal) BSW Whitworth British Standard coarse pitch
NPSL American Standard for cylindrical BSF Whitworth British Standard fine pitch
threads on pipes for nuts WHIT Whitworth Standard special pitch
NPSM American Standard for cylindrical threads R British Standard external threading for
on pipes for mechanical joints taper pipe (dryseal) (already BSP-Tr)
NGO American National pipe threads for gas exhaust Rc British Standard internal threading
NGS American National pipe threads for gas taper thread for pipe (BSP-Tr)
Rp British Standard cylindrical thread
for pipe (already BSP.PI)
Taper Pipe Threads British Standard Association threads
ANPT Taper pipe threads for Army, Navy and Airforce BA British Standard threads for bicycles
BSC
F-PTE Taper pipe fine threads (dryseal)
CEI British Standard for bicycles

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