This bearing washer serves as the flat locating surface for needle roller and cage assemblies, providing a hardened running face for the rollers. Width is 3.5 mm and net mass is 28.8 g. The washer is designed to be paired with AXK and K811 series roller and cage units, forming a complete axial bearing arrangement. Used in pairs on either side of the roller and cage assembly, this washer allows axial loads to be carried while keeping the overall installation height low. Since it is a bare steel washer with no seal or integrated grease fill, lubrication and sealing must be provided separately by the surrounding housing design, and correct flatness of the mating surfaces is required to achieve proper contact and load distribution across the washer face.