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Technical Description of productsInformation d d2 d1 d d2 d1 D1D1D1 D2D2D2D1 DDDD2 D 21. Taps for Pipe Threads 1. JIS Pipe Taps The pipe thread standard (JIS B 0202,0203) was revised in 1982 to meet ISO standard. In the same year, JIS B 4445 (straight pipe thread taps) and JIS B 4446 (taper pipe thread taps) were also revised. ○A part of the pipe thread standard was revised in 1966 to meet ISO, but in the 1982 revision, the ISO standard was de ned in the main book of JIS and the old 1966 standard was de ned in JIS Appendix. For Pipe Threads speci ed in the main book of JIS and JIS Appendix, thread symbols are di erent but the nominal size 1/8 to 6 inch are same. In the 1998 revision, the contents of the main book of JIS and JIS Appendix are not changed. ○ISO tap standard for pipe threads is di erent from the JIS tap standard in style, size and thread limit. Like the pipe thread standard, in JIS tap standards for pipe threads, style, size and thread limits of ISO standard are adopted in the main book of JIS and those of old JIS standard are in the JIS Appendix. For ISO standard (style and size), please refer to the next page. ○Thread limits of Rp and G taps are the same as the ISO standard. The thread limit of Rc taps is the same as the JIS class 2 of PT taps shown in JIS Appendix because Rc is not speci ed in the ISO standard. Therefore, both Rc taps and PT taps can be used interchangeably. For the relation between thread limit of internal threads and tap thread limit, please refer to the table below. ○Pipe Tap standard was revised in 1987. And tap designations shown in JIS Appendix were changed to PF taps for Parallel Pipe Thread, PT taps for Taper Pipe Thread, and PS taps for Parallel Pipe Thread. ■Symbol of Pipe threads Type Classi cation Standard JIS (ISO) JIS Appendix Internal Thread Taper Thread External Thread Taper Thread Internal Thread Parallel Thread External Thread PF, A class Internal Thread PF, B class Parallel Thread Parallel Thread External Thread G, A class PF, A class G, B class PF, B class ■ Relation between classification/engagement of pipe threads and taps Kind ofthreadClassification Main usage type Engagement Pipe taps Parallel Parallel internal thread PS PS （Rp） ' Basic diameter position InternalIn connection of pips, pipethreadsTaper internal thread PT Taper parts and fluid parts they Taper pipe are used mainly for the PT threads purpose of pressure type （Rc） Taper internal thread joints. Pipe t thread ExternalthreadsTaperPT（R） a f S-PTTaper external thread Parallel In connection of pipes, pipeparts and fluid parts, theyInternalthreadsPF（G）Parallel internal thread PF pipe are used mainly for the threads purpose of mechanical typejoints. ExternalthreadsPF（G） Parallel external thread Technical-63