Machinery's Handbook, 31st Edition
1008
Taps Table 26b. Tap Thread Limits ANSI/ASME B94.9-2008 (R2018) for Screw Thread Inserts (STI), Ground Thread, Metric Size (mm)
Tap Major Diameter, mm
Tap Pitch Diameter Limits, mm
Metric Size STI M2.5
Tolerance Class 4H
Tolerance Classes 5H and 6H
Pitch, mm
Min.
Max.
H limit
Min.
Max.
H limit
Min. 2.819 3.350 3.917 4.493 5.555 6.690 7.689 8.689 8.852
Max. 2.807 3.338 3.904 4.481 5.547 6.678 7.676 8.677 8.839
0.45 3.147 3.122
1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4
2.807 2.794 3.338 3.325 3.904 3.891 4.481 4.468 5.547 5.535 6.678 6.665 7.676 7.663 8.677 8.664 8.839 8.827 10.676 10.663 10.838 10.825 11.013 11.001 12.850 12.837 13.012 13.000 13.175 13.162 15.014 15.001 15.339 15.326 17.013 17.000 17.338 17.325 19.012 18.999 19.337 19.324 19.662 19.649 21.013 21.001 21.339 21.326 21.664 21.651 23.012 23.000 23.338 23.325 23.663 23.650 25.352 25.352 25.999 25.974 28.351 28.326 28.999 28.974 31.351 31.326 32.324 32.299 34.354 34.324 35.324 35.298 37.353 37.328 38.026 38.001 38.674 38.649 40.353 40.328 41.026 4 1.001 41.674 41.648
2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 6 6 6 6
M3
0.5 0.6 0.7 0.8
3.716 3.691 4.354 4.328 5.006 4.966 6.142 6.104 7.422 7.381 8.423 8.382 9.423 9.383 11.422 11.382 11.788 11.725
M3.5
M4 M5 M6 M7 M8
1 1 1 1 1
1.25 9.787 9.723
M10
10.688 10.676 10.851 10.838 11.026 11.013 12.863 12.850 13.025 13.012 13.188 13.175 15.027 15.014 15.364 15.352 17.026 17.013 17.363 17.351 19.025 19.012 19.362 19.350 19.688 19.675 21.026 21.013 21.364 21.351 21.689 21.676 23.025 23.012 23.363 23.350 23.688 23.675 25.377 25.352 26.025 25.999 28.377 28.351 29.025 28.999 31.377 31.351 32.349 32.324 34.379 34.354 35.349 35.324 37.379 37.353 38.052 38.026 38.699 37.674 40.378 40.353 41.051 41.026
1.25 12.131 12.068 1.25 13.787 13.724 14.133 14.069 1.75 14.478 14.415 1.5
M12
M14
1.5
16.132 16.068 16.822 16.759 18.133 18.070 18.821 18.758 20.132 20.069 20.823 20.759 21.514 21.450 22.131 22.068 22.822 22.758 23.513 23.449 24.130 24.067 24.823 24.760 25.512 25.448 26.820 26.756 28.237 28.132 29.822 29.759 31.237 31.138 32.822 32.758 34.925 34.826 35.822 35.758 37.925 37.826 38.821 38.758 40.236 40.137 41.615 41.516 41.821 41.758 43.236 43.137 44.615 44.516
2
M16
1.5
2
M18
1.5
2
2.5 1.5 2.5 1.5 2
M20
M22
2
2.5
2 3 2 3 2 2 3 2 3 4
M24
M27
M30
4 4 4 4 4 6 6
6 6 6 6 6 8 8
3.5
M33
M36
M39
2 3 4
4 6 6
6 8 8
41.699 41.674 These taps are over the nominal size to the extent that the internal thread they produce will accommodate a helical coil screw insert, which at final assembly will accept a screw thread of the normal size and pitch. STI basic thread dimensions are determined by adding twice the single thread height (2 × 0.64952 P ) to the basic dimensions of the nominal thread size. Formulas for major and pitch diameters are presented in MIL-T-21309E.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online