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Torque Specifications
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<blockquote data-quote="Timber338" data-source="post: 703318" data-attributes="member: 33822"><p>You guys can estimate fastener preload (clamping force from the action screws) very easily with the following equation. (assumes lightly lubricated threads)</p><p></p><p>Preload Force = Torque / (0.21 * bolt diameter)</p><p></p><p>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</p><p></p><p>So for a 1/4-28 action bolt (0.25 inches diameter) and 65 in*lbf Torque, the preload force = 1238 lbf.</p><p></p><p>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.</p><p></p><p>And remember these are estimates... lots of variables can change the actual preload force, but gives you a good starting point.</p></blockquote><p></p>
[QUOTE="Timber338, post: 703318, member: 33822"] 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. [/QUOTE]
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