Threads and Threading - Sportpilot.info

1792 METRIC SCREW THREADS M PROFILE
Table 7. American National Standard Length of Metric Thread Engagement
ISO 965/1 and ANSI/ASME B1.13M-1983 (R1995)
Basic Major Diameter dbsc Pitch
Short LE
Length of Thread Engagement
Normal LE Long LE
Over Up to and incl. P Up to and incl. Over Up to and incl. Over
1.5 2.8
2.8 5.6
5.6 11.2
11.2 22.4
22.4 45
45 90
90 180
180 355
All dimensions are in millimeters.
Machinery's Handbook 27th Edition
0.2 0.5 0.5 1.5 1.5
0.25 0.6 0.6 1.9 1.9
0.35 0.8 0.8 2.6 2.6
0.4 1 1 3 3
0.45 1.3 1.3 3.8 3.8
0.35 1 1 3 3
0.5 1.5 1.5 4.5 4.5
0.6 1.7 1.7 5 5
0.7 2 2 6 6
0.75 2.2 2.2 6.7 6.7
0.8 2.5 2.5 7.5 7.5
0.75 2.4 2.4 7.1 7.1
1 3 3 9 9
1.25 4 4 12 12
1.5 5 5 15 15
1 3.8 3.8 11 11
1.25 4.5 4.5 13 13
1.5 5.6 5.6 16 16
1.75 6 6 18 18
2 8 8 24 24
2.5 10 10 30 30
1 4 4 12 12
1.5 6.3 6.3 19 19
2 8.5 8.5 25 25
3 12 12 36 36
3.5 15 15 45 45
4 18 18 53 53
4.5 21 21 63 63
1.5 7.5 7.5 22 22
2 9.5 9.5 28 28
3 15 15 45 45
4 19 19 56 56
5 24 24 71 71
5.5 28 28 85 85
6 32 32 95 95
2 12 12 36 36
3 18 18 53 53
4 24 24 71 71
6 36 36 106 106
3 20 20 60 60
4 26 26 80 80
6 40 40 118 118
Unless otherwise specified, size limits for standard external tolerance classes 6g and 4g6g
apply prior to coating. The external thread allowance may thus be used to accommodate
the coating thickness on coated parts, provided that the maximum coating thickness is no
more than one-quarter of the allowance. Thus, the thread after coating is subject to acceptance
using a basic (tolerance position h) size GO thread gage and tolerance position g
thread gage for either minimum material, LO, or NOT-GO. Where the external thread has
no allowance or the allowance must be maintained after coating, and for standard internal
Copyright 2004, Industrial Press, Inc., New York, NY