This locknut secures bearing assemblies on a threaded shaft seat, transferring axial clamping force through a threaded ring engaged with a tab washer. Main dimensions comply with DIN 981, with a width of 9.0 mm and a net mass of 94.0 g, matching the standardized thread pitch and diameter series for this size. The KM8 is fitted together with a matching tab washer to lock the nut against rotation once tightened, preventing loosening under axial load and vibration during operation. Correct torque during assembly ensures the bearing inner ring is properly seated against its shoulder, maintaining the intended internal clearance and running accuracy of the mounted bearing.