The LOCK NUT NYLON UNF ZINC 9/16"-18 GR 2 is a hex nut featuring a nylon-filled collar that enhances resistance to loosening under vibration. Constructed from durable zinc-plated material, it offers excellent corrosion resistance and longevity in various applications. Ideal for automotive and industrial use, this lock nut provides a secure fit for screws, ensuring a reliable connection in demanding environments. Its 9/16"-18 thread size makes it compatible with a wide range of bolts and assemblies.