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10.9 vs 8.8 Grade Bolts

10.9 vs 8.8 Grade Bolts

10.9 vs 8.8 Grade Bolts

What is the difference between 8.8 and 10.9 grade steel? Which one performs better under cold weather? Is there something I can reference?

Thank you,

RE: 10.9 vs 8.8 Grade Bolts

The first digit is the ultimate strength of the material and the second is the ratio of yield stress to ultimate strength. Grade 8.8 bolts have an ultimate strength of around 800 N/mm2 (MPa) and a ratio of yield/proof stress to a yield strength of 80% i.e, 640 N/mm2 (MPa).

Extreme cold weather would require special bolts, I guess.


RE: 10.9 vs 8.8 Grade Bolts

Not sure what you mean by "low temperature" but ASTM A320 (iirc) is for low temps, I used that once working a LOX system

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