This washer serves as the housing raceway for a needle roller thrust bearing assembly, providing the axial support surface that works together with an AXK or K811 needle roller cage. Manufactured to DIN 5405-3/ISO 303, symbol AS90120, it has a net mass of 36.6 g, giving it a hardened flat contact face for axial load transfer. Because it is a separate raceway washer rather than a self-contained unit, it must be paired with the matching needle roller cage and, where required, a second washer to complete the thrust bearing arrangement. The flat, unflanged design allows the assembly to accommodate axial loads while keeping radial space to a minimum, and correct mounting depends on maintaining proper alignment and lubrication between the raceway and the rolling elements.