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■Comparison of the thread limit for straight pipe taps 2. American Pipe Thread Taps

Unit : μm

The Thread Limit of ISO (G) The Thread Limit of Appendix of PF American standard pipe thread has various types. We show their symbols and engagement of threads as follows.

SizeNumber ofPitchMajor Dia.Pitch Dia.Minor Dia.Major Dia.Pitch Dia.Minor Dia.
Threads※(mm)
Basic SizeBasic SizeTolerance Basic SizeBasic SizeBasic SizeTolerance Basic Size
(mm)(mm)(mm)(mm)(mm)(mm)

/ ■Pair groups of external thread and internal thread. 1 16

StandardSymbolInternal ThreadMating ThreadExternal ThreadMating Thread
American Standard Taper Pipe Thread for General Use
American Standard Straight Pipe Thread in Pipe Couplings
Pipe Threads, General PurposeAmerican Standard Taper Pipe Threads for Railing Joints
(ANSI/ASME B1.20.1)American Standard Straight Pipe Thread for Free- Fitting Mechanical Joints for Fixtures
American Standard Straight Pipe Thread for Loose-Fitting Mechanical Joints with Locknuts
American Standard Straight Pipe Threads for Loose- Fitting Mechanical Joints for Hose Couplings
Dryseal American Standard Taper Pipe Thread
Dryseal Pipe ThreadsDryseal SAE Short Taper Pipe Thread
(ANSI B1.20.3)Dryseal American Standard Fuel Internal Straight Pipe Thread
Dryseal American Standard Intermediate Internal Straight Pipe Thread

8 1/ 4 3 8 1/ 2 8 3 4 8

4 1/ 3/

1 4 1/ 2 3/ 1/ ※ : No. of ridges: Every 25.4 mm. UT : The upper deviation LT : The lower deviation

■Comparison of the thread limit of taper pipe taps

Unit : μm

The Thread Limit of ISO (Rp) The Thread Limit of Appendix of PS

SizeNumber ofPitchMajor Dia.Pitch Dia.Minor Dia.Major Dia.Pitch Dia.Minor Dia.
Threads※(mm)Note : These symbols correspond to the name of American pipe thread.
Tolerance Basic Size Basic Size Basic Size Tolerance Basic Size Basic Size Basic Size
(mm) (mm) (mm) (mm) (mm) (mm)
1/
16
1/These threads are
8
/(1) Thread angle is 60˚
1 4
/(2) Taper of Taper Thread is 3/4" per foot.
3 8
/(3) Fundamental height of triangle : H=Height of triangle thread profile H=0.866025P

1 2 (4) The difference between American Standard Pipe Thread for general use and Dryseal American Standard Pipe 3/ 4 ・Crests and roots truncation of thread is different.

・The length of engagement for pipe thread is different by types. 1/ ・With regard to standard, Dryseal American Standard Pipe Thread is available in right hand. 4 1/ In accordance with ANSI B 94.9, 4 types of pipe thread are specified in American Pipe Thread Standard. 2 Please refer to next page about the relation between taps and threads and about thread tolerance. 1/ 2 ※ : No. of ridges: Every 25.4 mm. UT : The upper deviation LT : The lower deviation Technical Inf