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

Unit : μm

SizeNumber of Threads※Pitch (mm)Major Dia. The ThreadLimit Pitch Dof ISO (G) ia.MinorDia.Major Dia. TheThread LimPitch it ofDia. Appendix ofMi PFnor Dia.
Basic Size (mm)Basic Size (mm)ToleranceBasic Size (mm)Basic Size (mm)Basic Size (mm)ToleraBasic (m nceS mize )
1 / 16
1 / 8
1 / 4
3 / 8
1 / 2
5 / 8
3 / 4
7 / 8ied
1 / 8ecifi
1 / 4ot Spi
1 / 2N i
3 / 4
1 / 4
1 / 2
3 / 4
1 / 2※: No. of ridges: Every25.4mm.
Comparisonof the thread limit of taper pi The Threadpe ta Limitps of ISO (Rp)UT : The uppe LT : The lower Ther deviation deviation Thread Limit ofAppendix ofU PSnit :μ
SizeNumber of Threads※Pitch (mm)Major Dia.Pitch Dia.MinorDia.Major Dia.PitchDia.MinorDia.
Basic Size (mm)Basic Size (mm)ToleranceBasic Size (mm)Basic Size (mm)Basic Size (mm)ToleranceBasic Size (mm)
1 / 16
1 / 8
1 / 4
3 / 8
1 / 2
3 / 4fied
Specii
1 / 4Not i
1 / 2i
1 / 2
※: No. of ridges: Every25.4mm.

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

Use

Pipe Threads, General Purpose Joints

Fitting Mechanical Joints for Hose Couplings

Dryseal Pipe Threads (ANSI B1.20.3) Dryseal American Standard Fuel Internal Straight Pipe Thread Dryseal American Standard Intermediate Internal Straight Pipe Thread

(4) The difference between American Standard Pipe Thread for general use and Dryseal American Standard Pipe ・The length of engagement for pipe thread is different by types.

Please refer to next page about the relation between taps and threads and about thread tolerance.

UT : The upper deviation LT : The lower deviation Technical Inf