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Originally Posted by sperry
I thought the fastener requires a certain amount of torque because lower torque would allow the threads to back out.
For example, a high-grade nut/bolt would require more torque than a lower grade because otherwise the threads would not stretch enough and therefore there wouldn't be enough friction to keep the nut on.
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Most required torques on fasteners are not specified to keep them from just loosening, they're specified to impart a clamping force on the joint. If you torque something down enough to impart any serious clamping force, the fastener is not going to back out.