Общий каталог Yamawa 2022 - 2023 - страница 1216

21. Taps for Pipe Threads


■Comparison of the thread limit of taper pipe tap
Description of products


Basic diameter position Basic diameter position Basic diameter position


ha : upper deviation


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
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
(μm) (μm)
/ 16
1
〜
/8
1 〜
/4
1 〜
/8
3 〜
/2
1 〜
/4
3 〜
〜
/4
1 〜
/2
1 〜
〜
/2
1
〜
〜
〜
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.
※ : No. of threads: Every 25.4 mm.


Technical-65