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Date Published:Jun. 18. 2015 Date Updated:Jan. 27. 2025

Dimensions of Holes for Hexagon Socket Cap Screws

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Dimensions of Holes for Hexagon Socket Cap Screws

Bore and bolt hole diameters for hex socket head cap screw

Unit:mm
Nominal diameter
of thread(d) 
M3  M4  M5  M6  M8  M10  M12  M14  M16  M20  M24 
ds  3 5   6   8 10 12 14 16 20 24
d′   3.4 4.5 5.5   6.6   9 11 14 16 18 22 26
dk  5.5 7 8.5 10 13 16 18 21 24 30 36
6.5 8 9.5 11 14 17.5 20 23 26 32 39
K 3 4 5   6   8 10 12 14 16 20 24
H1  2.7 3.6 4.6   5.5   7.4   9.2 11 12.8 14.5 18.5 22.5
H2  3.3 4.4 5.4   6.5   8.6 10.8 13 15.2 17.5 21.5 25.5



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