This securing plate locks the locknut in place on the shaft thread, preventing it from loosening under operating vibration or rotation. It has a bore diameter of 45.0 mm, an outside diameter of 69.0 mm, and a net mass of 14.0 g, with main dimensions manufactured to DIN 5406. The tab on the washer bends into a matching groove on the shaft while the outer lugs engage slots in the locknut, giving a positive mechanical lock without relying on friction alone. It is fitted together with the corresponding locknut and is suited to shaft-mounted bearing arrangements where secure axial fixation of the nut is required.