Quote:
Originally Posted by Myron Piatek
I have always heard that maximum strength is achieved when spline engagement is at a depth at least the diameter of the axle shaft.
I think the same theory (and rule) applies to wheel studs and their engagement into the main body of the lugs.
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The design rule of thumb from my engineering class is engagment needs to be 1 1/2 times diameter. I think this is for grade 5 fasteners. Though we all know this can be less if in a pinch.