21. Taps for Pipe Threads Description of products ■Comparison of the thread limit for straight pipe taps Unit : m The Thread Limit of ISO (G) The Thread Limit of Appendix of PF Size Number of Pitch Major Dia Pitch Dia Minor Dia Major Dia Pitch Dia Minor Dia Threads (mm) Basic Size LT Basic Size UT LT Tolerance Basic Size UT Basic Size LT Basic Size UT LT Tolerance Basic Size UT (mm) (+) (mm) (+) (+) (mm) (mm) (+) (mm) (+) (+) (mm) (+) 1/ 16 1/ 8 1/ 4 3/ 8 1/ 2 5/ 8 3/ 4 7/ 8 1/ 8 Not Specified 1/ 4 1/ 2 3/ 4 1/ 4 1/ 2 3/ 4 1/ 2 ※ : Threads per inch UT : The upper deviation LT : The lower deviation ■Comparison of the thread limit of taper pipe taps Unit : m The Thread Limit of ISO (Rp) The Thread Limit of Appendix of PS Size Number of Pitch Major Dia Pitch Dia Minor Dia Major Dia Pitch Dia Minor Dia Threads (mm) Basic Size LT Basic Size UT LT Tolerance Basic Size UT Basic Size UT LT Basic Size UT LT Tolerance Basic Size UT LT (mm) (−) (mm) (−) (−) (mm) (mm) (−) (mm) (−) (−) (mm) (−) 1/ 16 1/ 8 1/ 4 3/ 8 1/ 2 3/ 4 Not Specified 1/ 4 1/ 2 1/ 2 Technical Information ※ : Threads per inch UT : The upper deviation LT : The lower deviation Technical-59 830