Re: How are bolt torque specs arrived at?

"C. E. White" <cewhite3@[EMAIL PROTECTED]
> wrote in message This is done

using specialized machines
> that sense a change in the stress strain relation****p as the bolt
reaches 
> the yield point. This is a very good way to torque bolts for variable 
> loads, but difficult to duplicate in a repair environment.


I have seen bolt elongation gauges advertised and recommended for 
performance
engine building.  They are not so expensive.

I have never used one of them, and wonder if anyone here has any comments
on
them.