Page 70 - HOLE MAKING CATALOG p311-382

TAPS USER GUIDE

Thread Standards

Cylindrical Threads Taper Pipe Threads

UNC Unified coarse thread series NPT Taper pipe threads
UNF
UNEF Unified fine thread series NPTF Taper pipe threads (dryseal)
UN
Unified extra-fine thread series NPTR Taper pipe threads for railway equipment
UNS
Constant pitch series - threads with constant PTF-SAE SHORT Taper pipe short threads (dryseal)-SAE
UNJ pitch of T.P.I. 4, 6, 8, 12, 16, 20, 28, 32
PTF-SPL Taper pipe special threads (dryseal)-SAE
UNJC Selected combinations - threads with
special dia. - pitch combinations SHORT
UNJEF
Unified threads with constant pitch with radius on PTF-SPL EXTRA Extra short special threads (dryseal)-SAE
UNJF minor diameter from 0.15011 pitch to 0.18042 pitch
SHORT
Unified coarse thread with radius on minor
diameter from 0.15011 pitch to 0.18042 pitch SPL-PTF Special taper pipe dryseal threads

Unified extra-fine 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
Unified fine threads with radius on minor
diameter from 0.15011 pitch to 0.18042 pitch API American Petroleum Institute
taper pipe threads

Trapezoidal and Saw Tooth Threads

Pipe Cylindrical Threads ACME-C ACME Self-centering threads

NPS Cylindrical threads for pipe ACME-G ACME Generical application
NPSC
NPSF American Standard for pipe coupling STUB-ACME ACME Flat threads with

NPSH American Standard for internal reduced thread depth
threads on pipe, dryseal
NPSI 60º STUB-ACME ACME Flat threads with 60º flank angle
American Standard for cylindrical threads
NPSL for pipes, joints and nipples N BUTT American National Saw tooth threads

NPSM American Standard for internal cylindrical BSW British Standard
threads on pipe (dryseal) BSF
NGO WHIT Whitworth British Standard coarse pitch
NGS American Standard for cylindrical R
threads on pipes for nuts Whitworth British Standard fine pitch
Rc
American Standard for cylindrical threads Whitworth Standard special pitch
on pipes for mechanical joints Rp
British Standard external threading for
American National pipe threads for gas exhaust BA taper pipe (dryseal) (already BSP-Tr)
BSC
American National pipe threads for gas CEI British Standard internal threading
taper thread for pipe (BSP-Tr)
ANPT Taper Pipe Threads
F-PTE Taper pipe threads for Army, Navy and Airforce British Standard cylindrical thread
Taper pipe fine threads (dryseal) for pipe (already BSP.PI)

British Standard Association threads

British Standard threads for bicycles

British Standard for bicycles

380 ISCAR