A jam nut is half as tall as a regular nut. It is to be used as a locknut where it is jammed together with another nut to lock the joint in two places. A jam nut is used when another nut needs to be tightened and not be clamped into another object. Jam nuts can be used to tighten an object on a fastener without causing much damage to the fastener. Jam nuts can be unreliable under significant loads. If the inner nut is torqued more than the outer nut, the outer nut may yield. If the outer nut is torqued more than the inner nut, the inner nut may loosen up.

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