Stainless steel lock nut, also known as a self-locking nut, locking nut, or in some cases, a prevailing torque nut, is a type of nut used to secure bolted joints, that under vibration and torque, will resist loosening. Hexagonal Headed Nut Types of lock nuts include nylon insert lock nuts, all-metal lock nuts, serrated flange lock nuts, nylon insert jam lock nuts,Nut Plain Hexagon as well as galvanized Tri Lock nuts and Anco pin lock nuts. Nylon insert lock nuts are hex nuts that have a nylon collar insert in one end of the nut. The nylon insert increases friction on the screw thread, which resists loosening. The nylon insert lock nut is an economic locking nut and ideal in applications where vibration or motion could loosen or undo the Steel Hex Nut Material Stainless steel 201, 665, 667, 304, 316, etc Standard GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc…