This washer serves as a raceway surface for axial needle roller bearings, providing a flat, hardened running track for needle rollers or cages in thrust arrangements. It is designed to DIN 5405-3/ISO 303, giving it a standardized profile compatible with AXK and K811 series bearings. The net mass is 28.5 g. Since it functions purely as a bearing washer without integrated rolling elements, it must be paired with a matching needle roller and cage assembly to form a complete thrust bearing set. This construction allows the axial load to be transmitted through a flat, precisely ground contact surface, keeping installation height low compared to full thrust bearing units. No lubrication or sealing features are integral to the washer itself, so lubrication practice depends on the mating cage assembly used alongside it.