The NN-29-BK is a black nylon locking nut designed to secure strain relief fittings and other components. It features a 1-inch NPT thread for compatibility with standard fittings and panels. The nut has a thickness of 0.28 inches (7 mm) and requires a wrench across its 1.57-inch (40 mm) flats for tightening. As a key accessory, it ensures a secure and stable mechanical connection in cable management applications where strain relief is critical.