Hubbell Wiring Device-Kellems cord connector locknuts are used with strain relief, threaded metallic connectors and prevent the cables from being pulled out of the systems in conduit fastening applications. They feature nylon construction for excellent abrasion resistance & tensile strength and are equipped with a threaded body for quick installation & protection against skipping. Further, these non-conductive cord connector accessories are ideal for NEMA 4 & 6 enclosures to resist weak acids, saltwater, gasoline, oil, grease, alcohol & common solvents and have compressor nut ratchets, preventing unintentional loosening. Choose from a wide range of these CSA certified & UL listed locknuts, available in hub sizes of 3/8, 3/4, 1/2, 1, PG11, PG13 and PG16 inches.