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>The bolt must not see any shear itself.  The shear forces
are carried by the friction between the parts.<

I did the calculation for the 320/360 back when I was attaching the wings
and determined that the bolts would handle 9G in shear at the maximum
recommended gross weight.  Any friction between parts would be in addition
to that. I am not aware of any wing spar bolt failures so don't worry about
those spar bolts that may seem a bit small in diameter.  

Jim Frantz  

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