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I.S.O. Metric Coarse

Thread Form

ISO Metric Thread Form
  • p = Pitch
  • hn = Height of internal thread = 0.54127p
  • hs = Height of external thread = 0.61344p
  • r = Basic Radius = 0.1443p

Thread Tables

Nominal Diameter Pitch Basic Major Diameter Basic Effective Diameter Basic Minor Diameter of External Threads Basic Minor Diameter of Internal Threads Tapping Drill Clearance Drill
(mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
1 0.25 1 0.838 0.693 0.729 0.75 1.05
1.1 0.25 1.1 0.938 0.793 0.829 0.85 1.15
1.2 0.25 1.2 1.038 0.893 0.929 0.95 1.25
1.4 0.3 1.4 1.205 1.032 1.075 1.1 1.45
1.6 0.35 1.6 1.373 1.17 1.221 1.25 1.65
1.8 0.35 1.8 1.573 1.37 1.421 1.45 1.85
2 0.4 2 1.74 1.509 1.567 1.6 2.05
2.2 0.45 2.2 1.908 1.648 1.713 1.75 2.25
2.5 0.45 2.5 2.208 1.948 2.013 2.06 2.6
3 0.5 3 2.675 2.387 2.459 2.5 3.1
3.5 0.6 3.5 3.11 2.764 2.85 2.9 3.6
4 0.7 4 3.545 3.141 3.242 3.3 4.1
4.5 0.75 4.5 4.013 3.58 3.688 3.7 4.6
5 0.8 5 4.48 4.019 4.134 4.2 5.1
6 1 6 5.35 4.773 4.917 5 6.1
7 1 7 6.35 5.773 5.917 6 7.2
8 1.25 8 7.188 6.466 6.647 6.8 8.2
9 1.25 9 8.188 7.466 7.647 7.8 9.2
10 1.5 10 9.026 8.16 8.376 8.5 10.2
11 1.5 11 10.026 9.16 9.376 9.5 11.2
12 1.75 12 10.863 9.853 10.106 10.2 12.2
14 2 14 12.701 11.546 11.835 12 14.25
16 2 16 14.701 13.546 13.835 14 16.25
18 2.5 18 16.376 14.933 15.294 15.5 18.25
20 2.5 20 18.376 16.933 17.294 17.5 20.25
22 2.5 22 20.376 18.933 19.294 19.5 22.25
24 3 24 22.051 20.319 20.752 21 24.25
27 3 27 25.051 23.319 23.752 24 27.25
30 3.5 30 27.727 25.706 26.211 26.5 30.5
33 3.5 33 30.727 28.706 29.211 29.5 33.5
36 4 36 33.402 31.093 31.67 32 36.5
39 4 39 36.402 34.093 34.67 35 39.5
42 4.5 42 39.077 36.479 37.129 37.5 42.5
45 4.5 45 42.077 39.479 40.129 40.5 45.5
48 5 49 44.752 41.866 42.587 43 48.5
52 5 52 48.752 45.866 46.587 47 53
56 5.5 56 52.428 49.252 50.046 50.5 57
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Last modified: SolFlu  Fri, 26 Jun 2009 21:20:46 GMT