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New Grade 12.9 Socket Head Bolts

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V

vettedog72

Jedi Knight
Offline
I saw an advertisement for "New Grade 12.9 Socket Head Bolts" and wondered what I have missed. I am still thinking grade 8 is the recognized highest grade bolt for engines. Do socket head bolts have a separate grading system?
 
B

Bugeye58

Yoda
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That sounds like the grading system used for metric bolts.
With metrics, they generally run from 8.8 to 12.9.
Those grades are based on a different set of parameters than the SAE system.
Jeff
 
PeterK

PeterK

Yoda
Offline
Jeff is correct 12.9 is the metric equiv of SAE grade 8. SAE spec also has grade C and I've also seen 9 in race catalogs.
 
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