
21. Taps for Pipe Threads ■Comparison of the thread limit for straight pipe taps Description of products Unit : μm 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 Basic Size Basic Size Basic Size Basic Size Basic Size Tolerance Tolerance (mm) (mm) (mm) (mm) (mm) (mm) / 16 1 /8 1 /4 1 /8 3 /2 1 /8 5 /4 3 /8 7 Not Specified 1/8 1/4 1/2 3/4 1/4 1/2 3/4 1/2 ※ : No. of ridges: Every 25.4 mm. UT : The upper deviation LT : The lower deviation ■Comparison of the thread limit of taper pipe taps Unit : μm The Thread Limit of ISO (Rp) The Thread Limit of Appendix of PS Number of Pitch Major Dia. Pitch Dia. Minor Dia. Major Dia. Pitch Dia. Minor Dia. Size Threads※ (mm) Basic Size Basic Size Basic Size Basic Size Basic Size Basic Size Tolerance Tolerance (mm) (mm) (mm) (mm) (mm) (mm) / 16 1 /8 1 /4 1 /8 3 /2 1 Not Specified /4 3 1/4 1/2 1/2 ※ : No. of ridges: Every 25.4 mm. Information Technical UT : The upper deviation LT : The lower deviation Technical-66