Hexagon lock nuts with a non-metallic (nylon) insert provide a prevailing torque lock by pressing the nylon ring onto the bolt thread during tightening. The interference between the insert and the thread produces frictional resistance intended to reduce loosening from vibration or impact in service.

Offered in carbon steel and stainless steel (304, 316) with surface options such as zinc plating, black oxide and passivation. Conforms to referenced standards (GB/T 889 series, DIN 985, DIN 982, ISO 7040); available in metric sizes M3–M36 to match metric bolt threads. Please confirm required standard, size and finish before ordering.