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The QA1 right-hand jam nut with 5/8–18 threads is an aluminum locking nut sized with a 3/4-inch hex and 3/8-inch thickness for standard-thread applications. It helps lock a mating fastener in place to reduce loosening. QA1 makes these in steel or aluminum with standard and metric options and clear-anodized finish; sold individually to support threaded hardware and repair needs.
QA1 Jam Nut - 5/8-18 Right Hand - 3/4in Hex 3/8in Wide - Aluminum
