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Steel nut

"Stover style" lock nuts are one-piece hex nuts which derive their prevailing torque characteristics from controlled distortion of their top threads from their normal helical form to a more elliptical shape.
Frequently used in the automotive and metalworking industries, they can withstand severe vibration and shock loads. They are reusable and can withstand temperatures of up to 450°F.
self locking x 1/4" UNF - spanner size: 7/16" AF