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5/16 Nylon Insert Lock Nut. Materials: grade 2 Zinc finish NE steel. Threads are molded into the nylon insert locking the bolt into place. Nylon insert lock nuts typically have a cased metal outside formed in to a hex pattern easily torqued by a wrench or socket. Zinc plating retards the corrosion rate in a normal atmosphere. Fastenal Manufacture Number 37021.