The 3167 is a Heyco nylon locknut designed for PG 9 threaded applications in liquid-tight flexible conduit and fitting assemblies. Manufactured from nylon 6/6 material with a 94V-2 flammability rating, this locknut features a thickness of 0.218 inches (5.5 mm) and wrenching flats of 0.859 inches (21.8 mm), providing secure fastening and easy installation with standard tools. The locknut is rated for continuous operation across a temperature range of -22°F (-30°C) to 221°F (105°C), making it suitable for both indoor and outdoor industrial environments. It is available in standard black color and is commonly used in electrical enclosures, control panels, and conduit termination applications where reliable, corrosion-resistant fastening is required.