ab washer for round nut features inner tab and outer claws. The inner tab locks into shaft key groove. After tightening round nut, bend outer claws into the slots of round nut to realize mechanical anti-loosening and prevent rotation under vibration.

Materials: 65Mn spring steel, carbon steel, A2(304)/A4(316) stainless steel. Surface finish: black oxide, blue-white zinc, yellow zinc. Specially used for axial locking of bearings, transmission shafts and gearbox spindles.