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  • 1/2"-13 Whiz-lock Nut Zinc Plated (Box of 100)

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    A Whiz-Lock Nut is the brand name for a reusable, serrated flange lock nut.  When tightened, the nut’s serrated flange (protruding rim) “bites” into the mating part and creates a strong grip, making the nut resistant to being loosened by vibrations or torque (twisting). It can be used without a washer.