5/8"-11 Nylon Insert Locknut Heavy (NU) / Grade A Steel/Zinc Plated (Quantity: 50) Heavy Hex, Full Height

Has greater surface area than NM-series nuts, making wrenching easier. | Deisgned to be used with cap screws which have a minimum tensile strength not greater than 90,000 pcs. | Used in bridge and building construction, material handling, heavy equipment and field machinery. | NU Series (Heavy Hex, Full Height) | Nylon insert locknuts are not designed to be used in temperatures over 250 degrees fahrenheit