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Metric Bolt Head/Wrench Size

Hex Bolt Dimensions
Bolt Diameter
(mm)
Head/Wrench Size
(mm)
ASME / IFI / ANSI ISO* DIN* JIS*
4 7 7 7 7
5 8 8 8 8
6 10 10 10 10
7 - - 11 -
8 13 13 13 12
10 16 (or 15**) 16 17 14
12 18 18 19 17
14 21 - 22 -
16 24 24 24 -
18 - - 27 -
20 30 30 30 -

These values differ from the ISO standard.

* The DIN and JIS standards have been replaced by the ISO standard. However, the older DIN and JIS head sizes, shown here, are still commonly used.

** According to the standard unless 15mm heads are specificaly requested 16mm heads are supplied.

  • ASME - American Society of Mechanical Engineers
  • IFI - Industrial Fastener Institute
  • ISO - International Organization for Standardization
  • ANSI - American National Standards Institute
  • DIN - Deutsches Institut fur Normung
  • JIS - Japanese Industrial Standard

 

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