[bobcowan]

A grade 8 is extremly strong in tension, and can hold a lot of clamping force. But, that strength comes at a price. IIRC, that bolt is in single shear. Failure is inevitable.

In Carroll Smith's book "Nuts, Bolts, Fastner, and Plumbing Handbook", he states, "There is no place on a race car for a grade 8 bolt". I don't agree with that. But, I do believe there are very few places for a grade 8.