Internal tooth lock washers feature a ring of inward-pointing sharp teeth. When the fastener is tightened, the teeth engage the contact surface and help prevent loosening caused by vibration. They are intended for use with screws and smaller bolt assemblies where an internal serration increases joint friction.

Offered in carbon steel and stainless steel and produced to DIN 6797 A, ASME B18.21.1 and GB/T 861.1 standards. Please confirm material, size and finish for your application and specify the required standard when ordering.