Machinery's Handbook, 31st Edition
Metric Screw Threads M Profile 2021 allowance must be maintained after coating, and for standard internal threads, sufficient allowance must be provided prior to coating to ensure that finished product threads do not exceed the maximum material limits specified. For thread classes with tolerance position H or h , coating allowances in accordance with Table 6 for position G or g , respectively, should be applied wherever possible. Table 7. American National Standard Length of Metric Thread Engagement ISO 965/1 ANSI/ASME B1.13M-2005 (R2015) Basic Major Diameter d bsc Pitch P Length of Thread Engagement Short LE Normal LE Long LE Over Up to and incl. Up to and incl. Over Up to and incl. Over
0.2 0.25 0.35 0.4 0.45 0.35 0.5 0.6 0.7 0.75 0.8 0.75 1.25 1.5 1 1.25 1.5 1.75 1
0.5 0.6 0.8
0.5 0.6 0.8
1.5 1.9 2.6
1.5 1.9 2.6
1.5
2.8
1
1
3
3
1.3
1.3
3.8
3.8
1
1
3
3
1.5 1.7 2.2 2.5 2.4 2
1.5 1.7 2.2 2.5 2.4 2
4.5
4.5
5 6
5 6
2.8
5.6
6.7 7.5 7.1
6.7 7.5 7.1
3 4 5
3 4 5
9
9
5.6
11.2
12 15 11 13 16 18 24 30 12 19 25 36 45 53 63 22 28 45 56 71 85 95 36 53 71
12 15 11 13 16 18 24 30 12 19 25 36 45 53 63 22 28 45 56 71 85 95 36 53 71
3.8 4.5 5.6
3.8 4.5 5.6
11.2
22.4
6 8
6 8
2
2.5
10
10
1
4
4
1.5
6.3 8.5
6.3 8.5
2 3
22.4
45
12 15 18 21 15 19 24 28 32 12 18 24 36 45 20 26 40 50
12 15 18 21 15 19 24 28 32 12 18 24 36 45 20 26 40 50
3.5
4
4.5 1.5
7.5 9.5
7.5 9.5
2 3 4 5 6 2 3 4 6 8 3 4 6 8
45
90
5.5
90
180
106 132
106 132
60 80
60 80
180
355
118 150
118 150
All dimensions are in millimeters.
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