The M9142 is a Heyco® nylon locknut designed for 1/4 NPT threaded connections in liquid-tight flexible conduit and tubing systems. Manufactured from nylon 6/6 material with a 94V-2 flammability rating, this locknut features a thickness of 0.265 inches (6.7 mm) and wrenching flats of 0.748 inches (19.0 mm), providing secure fastening for NPT threaded fittings. The product is available in standard black color and operates reliably across a temperature range of -22°F (-30°C) to 221°F (105°C). This locknut is commonly used in electrical conduit installations, cable management systems, and industrial wiring applications where vibration resistance and corrosion protection are required.