Stainless Steel Nylon Insert Lock Nuts 3/8"-16 Coarse Thread

This is a retail clamshell pack of Grip Fast stainless steel nylon insert lock nuts (also commonly referred to as nyloc nuts). The package indicates a thread size of 3/8"-16, which represents a 3/8-inch standard coarse thread diameter. Designed to resist loosening under heavy vibrations, each nut features an integrated interior nylon ring insert that grips the mating bolt. The package originally contained a quantity of 4, though the transparent blister packaging shows 3 loose nuts inside. It is ideal for marine, automotive, or outdoor construction tasks requiring corrosion-resistant, high-strength fastening.