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Rifles, Reloading, Optics, Equipment
Gunsmithing
Torque Recomendations
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<blockquote data-quote="Clark" data-source="post: 943285" data-attributes="member: 6600"><p>You start with the screw rating.</p><p>You discount torque proportionally % for female engagement less than 1.5 times the root [the root is the minor diameter of the screw thread].</p><p>You discount torque for lube; 0% for dry, ~ 25% for oil or grease, and ~50% for wax.</p><p></p><p> For scope mount screws max torque is is often higher for the front screws [more female engagement] vs the back screws.</p><p></p><p>Empirical verification:</p><p>Mill some metal as thick as your receiver. Drill and tap. Clean out the tap magic and then lube as you would in the rifle. Torque until the female strips out. Discount that torque by a safety margin.</p></blockquote><p></p>
[QUOTE="Clark, post: 943285, member: 6600"] You start with the screw rating. You discount torque proportionally % for female engagement less than 1.5 times the root [the root is the minor diameter of the screw thread]. You discount torque for lube; 0% for dry, ~ 25% for oil or grease, and ~50% for wax. For scope mount screws max torque is is often higher for the front screws [more female engagement] vs the back screws. Empirical verification: Mill some metal as thick as your receiver. Drill and tap. Clean out the tap magic and then lube as you would in the rifle. Torque until the female strips out. Discount that torque by a safety margin. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Torque Recomendations
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