Metric Bolts - Head and Wrench Sizes

ANSI/SO, DIN and JIS

ANSI/SO, DIN and JIS metric bolt head and wrench sizes are indicated below:

Bolt Diameter
(mm)
Head/Wrench Size (mm)
ANSI/ISODINJIS
4 7 7 7
5 8 8 8
6 10 10 10
7   11  
8 13 13 12
10 16 17 14
12 18 19 17
14 21 22 19
16 24 24 22
18   27  
20 30 30  

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