ISO 4017 Hexagon head screws - Basic dimensions

ISO 4017 Hexagon head screws - Basic dimensions

Selected sizes used for CE (UKCA) marked BS EN 15048 Non-preloaded structural bolting assemblies

Diameter
(d)
M12M16M20M22M24M27M30M33M36
Thread pitch
(P)
1.7522.52.5333.53.54
k
(nom)
7.51012.514151718.72122.5
k
(Grade A)
7.32-7.689.82-10.1812.285-12.71513.785-14.21514.785-15.215
k
(Grade B)
7.21-7.799.71-10.2912.15-12.8513.65-14.3514.65-15.3516.65-17.3518.28-19.1220.58-21.4222.08-22.92
s
(nom/max)
182430343641465055
s
(min, Grade A)
17.7323.6729.6733.3835.38
s
(min, Grade B)
17.5723.1629.1633.0035.0040.0045.0049.0063.10
e
(min, Grade A)
20.0326.7533.5337.7239.98
e
(min, Grade B)
19.8526.1732.9537.2939.5545.2050.8555.3760.79
Dimensions in millimetres
SizeGrade AGrade B
M12 (l)Up and including 120Including and above 125
M16 (l)Up and including 150Including and above 155
M20 (l)Up and including 150Including and above 155
M22 (l)Up and including 150Including and above 155
M24 (l)Up and including 150Including and above 155
M27 (l)All lengths
M30 (l)All lengths
M33 (l)All lengths
M36 (l)All lengths

Whilst the information is provided in good faith, Andrews Fasteners Ltd are not under any responsibility or liability in respect of errors or information that was found to be incorrect or for any reliance the user may place on it.

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