Thread: Which bolt material for upper shock mount?

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Originally Posted by wingman9

I've always used a good quality cad plated grade 5 bolt in suspension situations. Reason being, although grade 8 are much higher in tensile strength, they are brittle in shear. The grade 8 will break under shear and the grade 5 will bend under the same load.

Wive's tale, indeed, but it is rampant in the hot rod world. It's so widespread that even one of the guys at Pete and Jakes in Peculiar, MO told me that one time when I questioned the bolts on something I bought from them. It was the only piece of questionable advice I ever received from them.