Tap Recommendations for Classes 2B and 3B

TTUnified Inch Screw Threads

recomm tap liended mits 1internal thread pitch diameter limits
thread size/pitchclass 2Bclass 3Bmin all classes (Basic)max class 2Bmax class 3B
3/4 - 16H5H40.70940.71590.7143
7/8 - 9H6H40.80280.81100.8089
7/8 - 14H6H40.82860.83560.8339
1” - 8H6H50.91880.92760.9254
1” - 12H6H40.94590.95350.9516
1-1/8 - 7H8H61.03221.04161.0393
1-1/8 - 8H8H61.04381.05281.0505
1-1/8 - 12H6H51.07091.07871.0768
1-1/4 - 7H8H61.15721.16681.1644
1-1/4 - 8H8H61.16881.17801.1757
1-1/4 - 12H6H51.19591.20391.2019
1-3/8 - 6H8H61.26671.27711.2745
1-3/8 - 8H8H61.29381.30311.3008
1-3/8 - 12H6H51.32091.32911.3270
1-1/2 - 6H8H61.39171.40221.3996
1-1/2 - 8H8H61.41881.42831.4259
1-1/2 - 12H6H51.44591.45421.4522
1-3/4 - 5H8H71.62011.63171.6288
2 - 4 1/2H8H71.85571.86811.8650

1Tap H limit selected for 3B will also produce thread to 2B.

Tap Recommendations for Class 6H Metric Screw Threads

threadsizerecommended tapinternal thread product limits — class 6H
nominal diameter (mm)pitch (mm)limit numberpitch d (m miniameter m) maxpitch d (i miniameter n) max
1,6 2 2,50,35 0,4 0,45D3 D3 D31,373 1,740 2,2081,458 1,830 2,303.05406 .06850 .08693.05740 .07205 .09067
3 3,5 40,5 0,6 0,7D3 D4 D42,675 3,110 3,5452,775 3,222 3,663.10531 .12244 .13957.10925 .12685 .14421
4,5 5 60,75 0,8 1D4 D4 D54,013 4,480 5,3504,131 4,605 5,500.15789 .17638 .21063.16264 .18130 .21654
71D56,3506,500.25000.25591
81,25D57,1887,348.28299.28929
101,5D69,0269,206.35535.36244
12 14 161,75 2 2D6 D7 D710,863 12,701 14,70111,063 12,913 14,913.42768 .50004 .57878.43555 .50839 .58713
20 24 302,5 3 3,5D7 D8 D918,376 22,051 27,72718,600 22,316 28,007.72346 .86815 1.09161.73228 .87858 1.10264
364D933,40233,7021.315041.32685

Language Version: WID_Allstar_2020_Tapping_D012_D013_EMEA September 17, 2019 11:44 AM