Обший каталог Yamawa 2016 - 2017 - страница 833

21. Taps for Pipe Threads


■Comparison of the thread limit of taper pipe tap


Description of products
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Basic diameter position Basic diameter position ～
Basic diameter position
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ha : upper deviation
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ha
P = 25.4/n


hd
n = Number of threads

hd : upper deviation
Taper
hd : lower deviation

Axis of tap


Unit : mm
Appendix (PT) Thread Limit
ISO (Rc)
Basic major PT Thread S-PT Thread ha hd
Size Number of
Dia. of
Threads Basic Diameter Basic Diameter Basic Diameter
Gauge Plane Thread Length Position Thread Length Position Thread Length Position Basic Size Tolerance Basic Size Tolerance
( m) ( m)
/ 16
1
～
/8
1 ～
/4
1 ～
/8
3 ～
/2
1 ～
/4
3 ～
～
/4
1 ～
/2
1 ～
～
/2
1
～
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～
Information
Technical


Note : JIS standard has 2 types of Taper pipe thread, PT and S-PT taps. ISO standard has one type of Taper pipe thread Rc.
: Threads per inch


Technical-58
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