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Socket head cap screw markings

1 Converted from megapascals (MPa)

Inch has one strength level, alloy steel.

Metric has two strength levels, property classes 12.9 and 8.8.

  • 8.8 is about 30% weaker.
  • 8.8 is also 20 – 50% less expensive.

Caution: Don’t substitute 8.8 for 12.9.

For metric M5 and larger, the property class and manufacturer’s I.D. is marked on the head.

ISO 9001:2008 and AS9120 certified
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