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Metric Flange Bolt Head/Wrench Size

Flange Bolt Diameter
(mm)
Head/Wrench Size
(mm)
DIN 6921 (1983) JIS B1189 (Type 2 2005)
5 8 -
6 10 10
8 13 12
10 15 14
12 16 -
14 18 -
16 21 -
20 27 -

DIN - Deutsches Institut für Normung
JIS - Japanese Industrial Standard