■Relation of pitch diameter tolerance zone between thread and tap

Parallel Pipe Thread : JIS B 0202 Straight Pipe Thread Taps : JIS B 4445

Example.1-11 Taper Pipe Thread : JIS B 0203 Taper Pipe Thread Taps : JIS B 4446

JISJIS AppendixJISJIS Appendix
Taper Thread
Parallel Thread

Taper Thread Parallel Thread Taper Thread Parallel Thread

G PF R Rc Rp PT PS

Thread Tap Thread Tap Thread Thread Tap Thread Tap Thread Tap Thread Tap

Basic Gauge Plane (31.770mm)

: PD tolerance of taper pipe threads is the value where the tolerance of axial direction is converted into that of radial direction. The thread tolerance of Taper Pipe Taps are specified by the gauge plane and thread profile of addendum and dedendum. Internal Thread External Thread