Обший каталог Yamawa 2016 - 2017 - страница 833

• Comparison of the thread limit of taper pipe tap

Basic diameter position

P = 25.4/n n = Number of threads

Taper

Basic diameter position

ha : upper deviation

hd : upper deviation hd : lower deviation

Axis of tap

～ ～ ～Basic diameter position ～ ～ ～ ～ ～ ～ ～ ～ ～ ～

Unit : mm

Appendix (PT) Thread Limit ISO (Rc)

Basic major PT Thread S-PT Thread ha hd

Number of Size Dia. of

Threads Basic Diameter Basic Diameter Basic Diameter

Gauge Plane Thread Length Thread Length Thread Length Tolerance Tolerance

• Position Position Position Basic Size Basic Size

( m) ( m) 1/ ～ 16 1/ ～ 8 1/ ～ 4 3/ ～ 8 1/ ～ 2 3/ ～ 4 ～ 1/ ～ 4 1/ ～ 2 ～ 1/ ～ 2 ～ ～ 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