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ISO Metric Thread Dimensions

Metric threads are manufactured according to strict specifications defined by the ISO standardisation authority to ensure cross-compatibility between mating components. The data below represents the dimensions of metric coarse machine screw threads as defined by ISO standards.

Please note that these figures relate to product design, and are always implemented with tolerances in mind. In practice, values related to tapping and drilling can vary significantly dependent on many factors such as material and operating temperature.

Thread Size Nominal Diameter (mm) Core Diameter (mm) Thread Pitch (mm) Effective Diameter (mm) Tapping Drill (mm) Clearance Hole (mm)
M1.6 1.6 1.1706 0.35 1.373 1.25 2.0
M1.8 1.8 1.3706 0.35 1.573 1.45 2.3
M2 2.0 1.5092 0.40 1.740 1.60 2.6
M2.2 2.2 1.6480 0.45 1.908 1.75 2.9
M2.5 2.5 1.9480 0.45 2.208 2.05 3.1
M3 3.0 2.3866 0.50 2.675 2.50 3.6
M3.5 3.5 2.7638 0.60 3.110 2.90 4.2
M4 4.0 3.1412 0.70 3.545 3.30 4.8
M4.5 4.5 3.5798 0.75 4.013 3.80 5.3
M5 5.0 4.0184 0.80 4.480 4.20 5.8
M6 6.0 4.7732 1.00 5.350 5.00 7.0
M7 7.0 5.7732 1.00 6.350 6.00 8.0
M8 8.0 6.4664 1.25 7.188 6.80 10.0
M10 10.0 8.1596 1.50 9.026 8.50 12.0
M12 12.0 9.8530 1.75 10.863 10.20 15.0
M14 14.0 11.5462 2.00 12.701 12.00 17.0
M16 16.0 13.5462 2.00 14.701 14.00 19.0
M18 18.0 14.9328 2.50 16.376 15.50 22.0
M20 20.0 16.9328 2.50 18.376 17.50 24.0
M22 22.0 18.9328 2.50 20.376 19.50 26.0
M24 24.0 20.3194 3.00 22.051 21.00 28.0
M27 27.0 23.3194 3.00 25.051 24.00 33.0
M30 30.0 25.7060 3.50 27.727 26.50 35.0
M33 33.0 28.7060 3.50 30.727 29.50 38
M36 36.0 31.0924 4.00 33.402 32.00 41
M39 39.0 34.0924 4.00 36.402 35.00 44
M42 42.0 36.4790 4.50 39.077 37.50 47
M45 45.0 39.4790 4.50 42.077 40.50 50
M48 48.0 41.8646 5.00 44.752 43.00 53
M52 52.0 45.8646 5.00 48.752 47.00 57
M56 56.0 49.2522 5.50 52.428 50.50 61
M60 60.0 53.2522 5.50 56.428 54.50 65
M64 64.0 56.6388 6.00 60.103 58.00 69
M68 68.0 60.6388 6.00 64.103 62.00 73

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