Originally Posted by Outlaw6.0
^^^ IIRC with a 1/4in fastener the clamping force is somewhere in the 1200lb range.
You guys can estimate fastener preload (clamping force from the action screws) very easily with the following equation. (assumes lightly lubricated threads)
Preload Force = Torque / (0.21 * bolt diameter)
Where Torque is in inch*lbf, 0.21 is the unitless coefficient of friction, and bolt diameter is in inches. You can re-arrange the equation and input your desired Preload Force and calculate your necessary Torque if you prefer it that way too
So for a 1/4-28 action bolt (0.25 inches diameter) and 65 in*lbf Torque, the preload force = 1238 lbf.
Outlaw 6.0 is right on... And I agree that is a high preload. 45 in*lb torque still gives 857 lbf of preload for each action bolt.
And remember these are estimates... lots of variables can change the actual preload force, but gives you a good starting point.