Posted by Cragyon (188.8.131.52) on November 11, 2002 at 18:57:28:
In Reply to: Bolt Torque in Al posted by Jim on November 11, 2002 at 16:57:11:
": Looking at the bolt torque calculator, no length of engagement is considered. Isn't that critical?
: The torque given for a 10-32 in aluminum is 13.8 in/lb, but at what length? Is the bolt considered to be aluminum too, in that calculator?"
In general, the fastener torque design does not consider thread engagement. I believe most folks assume 1.5D (major) thread engagement when designing for a fastener fit.
I believe one could calculate a fastener torque while considering actual thread engagment.
Check out the thread stress area calculator here on enigneers edge. With this calculator you can determine actual thread stress for a given engagement.
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