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It depends which thread the screw is, the pitch and depth of the thread varies.

B.S.F. - 5.3 mm
Whitworth - 5.10 mm
B.S.P. - 11.80 mm
U.N.F. - 5.50 mm
U.N.C. - 5.2 mm

A.N.C., A.N.F. and B.A. threads are numbered, I.S.O threads are in metric

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