Self Tapping Screw Thread Dimensions

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The tables below show the thread pitch, major and minor diameters of metric and imperial self tapping screws.

For guidance only

Nominal SizePitchMajor DiameterMinor Diameter
maxminmaxmin
2.20.82.242.11.631.52
2.91.12.92.762.182.08
3.51.33.533.352.642.51
3.91.43.913.732.922.77
4.21.44.224.043.12.95
4.81.64.84.623.583.43
5.51.85.465.284.173.99
6.31.86.256.034.884.7

Metric Thread Dimensions Measurement Drawing

ScrewThreads Per InchMajor DiameterMinor Diameter
maxminmaxmin
No. 2320.0880.0830.0640.06
No. 4240.1140.1090.0860.082
No. 6200.1390.1320.1040.099
No. 7190.1540.1470.1150.109
No. 8180.1660.1590.1220.116
No. 10160.1890.1820.1410.135
No. 12140.2150.2080.1640.157
No. 14140.2460.2370.1920.185

Imperial Thread Dimensions Measurement Drawing

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