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ISO 4017 - Hexagon head bolts with thread up to head

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ISO 4017 Hexagon head screws – Basic dimensions

ISO 4017 Hexagon head screws – Basic dimensions

Selected sizes used for CE Marking under EN 15048

Dimension (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 milimeters
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