ISO 4017 Hexagon head screws - Basic dimensions

ISO 4017 Hexagon head screws – Basic dimensions

Selected sizes used for CE (UKCA) Marking under BS EN 15048

Diameter
(d)
M12 M16 M20 M22 M24 M27 M30 M33 M36
Thread pitch
(P)
1.75 2 2.5 2.5 3 3 3.5 3.5 4
k
(nom)
7.5 10 12.5 14 15 17 18.7 21 22.5
k
(Grade A)
7.32-7.68 9.82-10.18 12.285-12.715 13.785-14.215 14.785-15.215
k
(Grade B)
7.21-7.79 9.71-10.29 12.15-12.85 13.65-14.35 14.65-15.35 16.65-17.35 18.28-19.12 20.58-21.42 22.08-22.92
s
(nom)
18 24 30 34 36 41 46 50 55
s
(min, Grade A)
17.73 23.67 29.67 33.38 35.38
s
(min, Grade B)
17.57 23.16 29.16 33.00 35.00 40.00 45.00 49.00 63.10
e
(min, Grade A)
20.03 26.75 33.53 37.72 39.98
e
(min, Grade B)
19.85 26.17 32.95 37.29 39.55 45.20 50.85 55.37 60.79
Dimensions in millimetres
Size Grade A Grade B
M12 (l) Up and including 120 Including and above 125
M16 (l) Up and including 150 Including and above 155
M20 (l) Up and including 150 Including and above 155
M22 (l) Up and including 150 Including and above 155
M24 (l) Up and including 150 Including and above 155
M27 (l) All lengths
M30 (l) All lengths
M33 (l) All lengths
M36 (l) All lengths

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