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Re: Grade 8 vs. 10.9 shear strength (archive)
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Posted by Benkku on August 29, 2000 at 03:58:27:

In Reply to: Grade 8 vs. 10.9 shear strength 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.

Maybe im getting confused about the different grades (sae vs. metric) but i recently bought new bolts for my half-shafts and had to check what had been used by BMW originally. Every bolt that i found (4 different cars) where grade 8.8 ( that would be grade 5 (sae) ?)
Am i correct or have all the half-shaft bolts on my 4 different cars been changed to weaker ones by the PO's?
Benkku





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