Page 698 - Yamawa_European_Catalogue_YEU21

17. Taps for Pipe Threads

Intro

American Pipe Thread Taps
SP American standard pipe thread has various types. We show their symbols and engagement of threads as follows.

Pair groups of external thread and internal thread.
SL Standard Description Internal Thread Mating Thread External Thread Mating Thread

NPT
American Standard Taper Pipe Thread for General Use NPT NPT NPT
NPSC
PO American Standard Straight Pipe Thread in Pipe Couplings NPSC NPT - -
Pipe Threads,
American Standard Taper Pipe Threads for Railing Joints NPTR NPTR NPTR NPTR
General Purpose
American Standard Straight Pipe Thread for Free-Fitting Mechanical NPSM NPSM NPSM NPSM
ST (ANSI/ASME B1.20.1) Joints for Fixtures
American Standard Straight Pipe Thread for Loose-Fitting Mechanical NPSL NPSL NPSL NPSL
Joints with Locknuts
American Standard Straight Pipe Threads for Loose-Fitting Mechanical
Joints for Hose Couplings NPSH NPSH NPSH NPSH
ROLL
NPTF NPTF, NPSF, NPSI
Dryseal American Standard Taper Pipe Thread NPTF NPTF
PTF-SAE-SHORT PTF-SAE-SHORT
NPTF
Dryseal Pipe Threads Dryseal SAE Short Taper Pipe Thread PTF-SAE-SHORT NPTF PTF-SAE-SHORT NPSI
CARBIDE
(ANSI B1.20.3) Dryseal American Standard Fuel Internal Straight Pipe Thread NPSF NPTF - -
NPTF
Dryseal American Standard Intermediate Internal Straight Pipe Thread NPSI - -
PTF-SAE-SHORT
LONG
Note: These symbols correspond to the name of American pipe thread.

These threads are
HAND (1) Thread angle is 60˚
TAPS (2) Taper of Taper Thread is 3/4” per foot.
(3) Fundamental height of triangle : H=Height of triangle thread profile H=0.866025P
(4) The difference between American Standard Pipe Thread for general use and Dryseal American Standard Pipe
• Crests and roots truncation of thread is different.
EG (STI) • The length of engagement for pipe thread is different by types.
• With regard to standard, Dryseal American Standard Pipe Thread is available in right hand.
In accordance with ANSI B 94.9, 4 types of pipe thread are specified in American Pipe Thread Standard.
Please refer to next page about the relation between taps and threads and about thread tolerance.
SPECIAL
THREADS,
GAUGES

THREAD
MILLS

DIES

CENTER
DRILLS

Technical
info

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