This washer serves as the bearing seat surface for axial needle roller and cage assemblies, providing a hardened, ground raceway that carries axial load between the housing and the rotating cage. It is manufactured to DIN 5405-3/ISO 303 dimensional standards, matching the AS130170 designation, with a net mass of 69.3 g. The flat washer design allows it to be paired with corresponding AXK or K811 needle roller and cage assemblies to form a complete axial bearing arrangement. Since the washer itself carries no seals or integrated lubrication, grease or oil must be applied separately according to the operating conditions of the assembly. The flat raceway surface accommodates the axial displacement inherent to needle roller and cage sets, while the ground finish ensures proper rolling contact and load distribution across the working face. Correct alignment between the washer and the mating cage assembly is required to maintain uniform contact pressure during operation.