Re: Torque Guides

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Posted by TheOldHokie on March 22, 2021 at 04:49:30 [URL] [DELETE] :

In Reply to: Re: Torque Guides posted by Kimberly on March 21, 2021 at 20:17:10:

No. Torque is and always will be simply T=FR. That is the value a torque wrench measures.

The screw threads transmit that applied torque axially which results in the generation of axial tension (clamping force) along the center axis of the fastener. That is the force that stretches the fastener and makes it act like a spring. The formula for calculating (an approximation of) the tension generated from an applied torque is:

F=(T x 12) / (k x D)


F = axial tension (clamping force) in pounds
T = applied torque in lb-ft
D = diameter of fastener in inches
k = a dimensionless coefficient of friction (K-factor)


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