Shaft locating washer WS81115 provides the flat axial raceway for a single-direction axial cylindrical roller bearing assembly of the 811 series, working together with the K811 cage-and-roller unit and the housing locating washer GS. The bore diameter is 75.0 mm and the net mass of this component is 147.0 g, with a ground flat surface that carries axial load in one direction only. This washer must be mounted together with its matching K811 roller and cage unit and the GS housing washer, since it does not carry radial load on its own. The flat raceway design allows the complete axial bearing to accommodate high axial loads at low to moderate speeds, with the shaft washer requiring proper axial location and a rigid, well-supported abutment to maintain correct contact between the rollers and the raceway surface.