This axial bearing washer forms the housing raceway for a needle roller and cage thrust assembly, providing the flat bearing surface required to support axial loads. Symbol AS2542 corresponds to the dimensional series matched to AXK and K811 thrust needle assemblies, manufactured to DIN 5405-3/ISO 303. The net mass of the washer is 6.4 g. Because the washer is a separate ring, it must be mounted together with the corresponding thrust needle cage assembly and a second raceway washer to build a complete axial bearing arrangement. The flat, hardened raceway surface allows the needle rollers to run true under axial load, while the open design permits lubrication with grease or oil to be applied directly to the raceway and rolling elements during assembly.