1 Converted from megapascals (MPa)
Inch has one strength level, alloy steel.
Metric has two, 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.
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