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8.8 / 10.9 / 12.9

A technical RFQ guide for purchasing and engineering teams.

8.8 / 10.9 / 12.9

For steel bolts, the property class defines a set of mechanical properties—not simply 'hardness'. A higher class is not automatically better for every application; joint design, nut class, finish and hydrogen embrittlement risk should be considered together.

Before ordering

Use the current standard revision, manufacturer datasheet and project specification. A title or standard number alone does not establish technical equivalence.

Identify the part and revision.
Describe application, environment and acceptance criteria.
Include document requirements and sourcing restrictions.
Resolve exceptions and alternatives with technical approval.

Sources and updates

ISO standards catalogue

Editor: ÇETİMUR technical content. Updated 6 October 2026. General guidance, not design approval.