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Old December 20th, 2007, 12:56 PM   #20
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Join Date: Oct 2004
Location: Cincinnati OH
Posts: 1,492
Default Re: Split Tube Axle How To

Great write-up Walt. The argument about the shear strength of the 8 bolts does not hold up to engineering analysis. Your design is fine and even overkill, based on simple analysis.

The shear strength of a 5/16 bolt is:
Grade 5 = 5750 lbs minimum
Grade 8 = 6980 lbs minimum

Since your design has 4 bolts per side, and even using the lower grade 5 spec values, 4 x 5750 = 23000 lbs.

Now if anyone can think that there is 23000 lbs of force trying to pull apart that axle, they are crazy. Walt's design has a numerous times factor of safety.
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