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Posted by Cragyon (216.78.58.196) 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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• Re: Re: Bolt Torque in Al Jim 17:21:18 11/13/02 (0)

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Subject: Re: Re: Bolt Torque in Al

Comments:
: ": 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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