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Metric Nut Sizes

Nut diameterHex nut heightNylock Nut Height
Nut Size
(mm)
Width across the Flats
(mm)
Height
(mm)
ISO* DIN* JIS* Hex Nut Jam Nut Nylock Nut
2 4 4 4 1.6 1.2 -
2.5 5 5 5 2 1.6 -
3 5.5 5.5 5.5 2.4 1.8 4
4 7 7 7 3.2 2.2 5
5 8 8 8 4 2.7 5
6 10 10 10 5 3.2 6
7 - - 11 5.5 3.5 -
8 13 13 12 6.5 4 8
10 16 17 14 8 5 10
12 18 19 17 10 6 12
14 21 22 - 13 7 14
16 24 24 - 13 8 16
18 27 27 - 15 9 18.5
20 30 30 - 16 10 20

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* The DIN and JIS standards have been replaced by the ISO standard.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

  • 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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