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Hex lock nut with a nylon insert is simply a hex nut with a nylon collar, which helps prevent movement when subject to vibration.
zinc plated steel hex lock nut, w/ nylon insert protective plating, commonly used for outdoors price starts at $1.25/bag
stainless steel 18-8 hex lock nut, w/ nylon insert non-corrosive, common for marine and outdoor use price starts at $2.77/bag
