Technical Section
  Limits for Metric (Standard) Coarse Threads
  Nuts tolerance class 6H ***
Thread Normal Engagement Length Major Diameter Pitch Diameter Minor Diameter***
  from to min. max. min. max. min.
M 1 0.6 1.7 1.000 0.838 0.894 0.729 0.785
M 1.2 0.6 1.7 1.200 1.038 1.094 0.929 0.985
M 1.4 0.7 2 1.400 1.205 1.265 1.075 1.142
M 1.6 0.8 2.6 1.600 1.373 1.458 1.221 1.321
M 1.8 0.8 2.6 1.800 1.573 1.658 1.421 1.521
M 2 1 3 2.000 1.740 1.830 1.567 1.679
M 2.5 1.3 3.8 2.500 2.208 2.303 2.013 2.138
M 3 1.5 4.5 3.000 2.675 2.775 2.459 2.599
M 3.5 1.7 5 3.500 3.110 3.222 2.850 3.010
M 4 2 6 4.000 3.545 3.663 3.242 3.422
M 5 2.5 7.5 5.000 4.480 4.605 4.134 4.334
M 6 3 9 6.000 5.350 5.500 4.917 5.153
M 7 3 9 7.000 6.350 6.500 5.917 6.153
M 8 4 12 8.000 7.188 7.348 6.647 6.912
M 10 5 15 10.000 9.026 9.206 8.376 8.676
M 12 6 18 13.000 10.863 11.063 10.106 10.441
M 14 8 24 14.000 12.701 12.913 11.835 12.210
M 16 8 24 16.000 14.701 14.913 13.835 14.210
M 18 10 30 18.000 16.376 16.600 15.294 15.744
M 20 10 30 20.000 18.376 18.600 17.294 17.744
M 22 10 30 22.000 20.376 20.600 19.294 19.744
M 24 12 36 24.000 22.051 22.316 20.752 21.252
M 27 12 36 27.000 25.051 25.316 23.752 24.252
M 30 15 45 30.000 27.727 28.007 26.211 26.771
M 33 15 45 33.000 30.727 31.007 29.211 29.771
M 36 18 53 36.000 33.402 33.702 31.670 32.270
M 39 18 53 39.000 36.402 36.702 34.670 35.270
***Note: M 1 - M 1.4 are given tolerance class 5H
To Fastener Related Measurements

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