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Grade 8 vs. 10.9 shear strength (archive)
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Posted by EMak on August 27, 2000 at 22:37:25:

Anybody out there tried using 5/16" diameter grade 8 bolts for the outsides of the rear half shafts (where they bolt to the spindles). A 5/16" diameter bolt fits great, they are cheap and readily available. Came with 8MM 10.9 grade bolts. My internet searching shows grade 8 and 10.9 to have practically identical tension load strength. No luck finding good shear strength data.

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