21. Taps for Pipe Threads Description of products ■Relation of pitch diameter tolerance zone between thread and tap Example.1-11 Parallel Pipe Thread : JIS B 0202 Straight Pipe Thread Taps : JIS B 4445 Taper Pipe Thread : JIS B 0203 Taper Pipe Thread Taps : JIS B 4446 JIS JIS Appendix JIS JIS Appendix Parallel Thread Taper 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 B Class 2 Class 3 Class Basic Gauge Plane (31.770mm) A Class A Class A Class B Class B Class 2 Class 3 Class : PD tolerance of taper pipe threads is the value where the tolerance of axial direction is The thread tolerance of Taper Pipe Taps are specified by the gauge converted into that of radial direction. plane and thread profile of addendum and dedendum. Internal Thread External Thread Technical Information Technical-57 828