Mechanical properties of nuts with ISO metric threads (coarse)

according to ISO 898, part 2

¹⁾Nuts style 1 (ISO 4032) ≈ 0,9 d nuts
²⁾Nuts style 2 (ISO 4033) ≈ 1,0 d nuts
³⁾ Class 8 ≤ M16 only type 1 (not heat-treated)
> M16 type 1 (hardened and tempered) and type 2 (not heat-treated)

The mechanical properties as listed apply to heat-treated nuts:

Mechanical properties of nuts with ISO metric threads (coarse) notes

Notes

The minimum hardness values are binding only for nuts for which a test stress measurement can not be performed and for heat treated nuts. The minimum values are guidelines for all other nuts.
The minimum hardness values for nuts with nominal thread diameters above 39 and to 100 mm are for information only and are considered reference values.

Mechanical properties of nuts with ISO metric threads (coarse)

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Nuts property class 04 to 12

Notes

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