This self-locking hex nut, also known as a lock nut, features a nylon insert and conforms to the NM/NE UNC type per ASME B18.16.6. The built-in locking mechanism helps prevent the nut from backing off due to vibration or mechanical stress. Made from stainless steel in accordance with ASTM F594 304, this nut is rated to strength class CW and features Unified National Coarse (UNC) threads.