Page 1929 - Master Catalog 2017, Inch

Technical Information
Tap Recommendations for Classes 2B and 3B

„ Unified Inch Screw Threads
recommended internal thread
tap limits 1 pitch diameter limits
min max max
thread class class all classes class class
size/pitch 2B 3B (Basic) 2B 3B
0-80 H2 H2 0.0519 0.0542 0.0536
1-64 H2 H2 0.0629 0.0655 0.0648
1-72 H2 H2 0.0640 0.0665 0.0659
2-56 H2 H2 0.0744 0.0772 0.0765
2-64 H2 H2 0.0759 0.0786 0.0779
3-48 H3 H2 0.0855 0.0885 0.0877
3-56 H2 H2 0.0874 0.0902 0.0895
4-40 H3 H2 0.0958 0.0991 0.0982
4-48 H3 H2 0.0985 0.1016 0.1008
5-40 H3 H2 0.1088 0.1121 0.1113
5-44 H3 H2 0.1102 0.1134 0.1126
6-32 H3 H2 0.1177 0.1214 0.1204
6-40 H3 H2 0.1218 0.1252 0.1243
8-32 H3 H3 0.1437 0.1475 0.1465
8-36 H3 H3 0.1460 0.1496 0.1487
10-24 H3 H3 0.1629 0.1672 0.1661
10-32 H3 H3 0.1697 0.1736 0.1726
12-24 H3 H3 0.1889 0.1933 0.1922
12-28 H3 H3 0.1928 0.1970 0.1959
1/4-20 H5 H3 0.2175 0.2224 0.2211
1/4-28 H4 H3 0.2268 0.2311 0.2300
5/16-18 H5 H3 0.2764 0.2817 0.2803
5/16-24 H4 H3 0.2854 0.2902 0.2890
3/8-16 H5 H3 0.3344 0.3401 0.3387
3/8-24 H4 H3 0.3479 0.3528 0.3516
7/16-14 H5 H3 0.3911 0.3972 0.3957
7/16-20 H5 H3 0.4050 0.4104 0.4091
1/2-13 H5 H4 0.4500 0.4565 0.4548
Technical Information
1/2-20 H5 H3 0.4675 0.4731 0.4717
9/16-12 H5 H4 0.5084 0.5152 0.5135
9/16-18 H5 H3 0.5264 0.5323 0.5308
5/8-11 H5 H4 0.5660 0.5732 0.5714
5/8-18 H5 H3 0.5889 0.5949 0.5934
3/4-10 H5 H4 0.6850 0.6927 0.6907
1
Tap H limit selected for 3B will also produce thread to 2B.
NOTE: The above recommended taps normally produce the class of thread indicated in average materials when used with reasonable care.
However, if the specified tap does not provide a satisfactory gage fit, choose an alternate tap limit.

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