This washer functions as a locating and support ring for axial needle roller bearings, providing a hardened running surface on which the bearing cage and rollers operate. Designed to DIN 5405-3/ISO 303, symbol AS120155 is dimensionally matched to AXK and K811 series bearings, giving a net mass of 55.4 g. The flat raceway construction allows it to be paired directly with the corresponding needle bearing to form a complete axial support arrangement, transmitting axial load while keeping radial space requirements low. As a separate ring without integrated sealing or grease charge, it requires the mating bearing and housing arrangement to provide lubrication and any necessary sealing, with alignment and squareness of the mounting faces determining running accuracy.