The 2257 is a nickel-plated brass metal locknut designed for use with PG 7 threaded fittings in liquid-tight cordgrip assemblies. It features a thickness of 0.110 inches (2.8 mm) and wrenching flats of 0.591 inches (15.0 mm), providing secure fastening and easy installation with standard wrenching tools. The brass construction with nickel plating offers corrosion resistance and durability in demanding industrial environments. This locknut is commonly used in electrical enclosures, control panels, and outdoor installations where reliable sealing and vibration resistance are required.