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Originally Posted by trekkor
I'm not seeing a grade higher than 8 for bolts.
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ASTM A574 is the spec for common socket head cap screws (exceeds SAE Gr 8). Metric 12.9 fasteners exceed GR 8. Gr 8 is not really very strong in the world of high-strength fasteners.
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So, that being said, what makes a wheel bolt stronger or more special than a quality hardware store, grade 8 bolt?
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Nothing, possibly, but how do you make that determination? The wheel bolts in your wheels might have been GR 5 orginally. Bolted joint design is complicated and unless you know what you are doing, I would either use what the manufacturer recommended or find somebody who knows what they are doing to select a fastener/torque for you. This is not a situation to
guess.