Hex nuts with lock washers are used to reduce loosening caused by vibration. they have a spinning lock washer with external teeth that dig into the bearing surface, which locks the fastener in place.

Value collection 1/4-20 unc, 3" length under head hex head cap screwbrass, 7/16" hex. brass is an alloy of copper and zinc that is durable, nonmagnetic and conductive. system of measurement inch thread size (inch) 1/4-20 length (inch) 3 material brass hex size (inch) 7/16 thread standard unc.

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