This washer serves as the raceway surface for needle roller and cage thrust assemblies, providing a flat axial bearing face that carries axial loads while allowing the needle rollers to run directly against a hardened surface. It is manufactured to DIN 5405-3/ISO 303, matching the AXK and K811 series in dimensions and fit. Net mass of the washer is 3.215 g. Being a separate raceway component, it must be paired with the corresponding needle roller and cage thrust assembly rather than used on its own, since it carries no rolling elements or seals itself. Its flat, hardened running surface accommodates axial loads only and requires the mating shaft or housing surface to provide the counter-raceway for the assembly to function correctly. Lubrication and operating tolerances are governed by the mating AXK or K811 assembly with which this washer is used.