I may as well chime in on this lively discussion. I pulled this
equation off the web:
*Torque = K W preload W diameter*
Where K is a constant usually between 0.1 and 0.3 and
is dependent upon many factors including thread pitch,
thread profile angle, and coefficients of friction.
Consequently a 1/2 inch bolt tightened to 45 ft-lbs produces
a preload, clamping force, of from 3600 to 10800 lbs of force.
David Brady
'68 TR250, CD8124L
Michael Marr wrote:
> Thus, a 45 lb pull on a 1 ft wrench = 45 ft-lbs. If you are applying
> this torque to a 1/2 inch bolt, the force at the thread is
> 45/(0.25/12) lbf, or 2,160 lbs. This circumferential force around the
> diamter of the threaded fastener converts to clamping force because t
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