Carries axial loads in one direction only and separates the shaft-side and housing-side washers of a deep groove ball bearing with a steel sheet metal cage (JP). Overall height is 26.0 mm, net mass 0.65 kg, limiting speed 4200 1/min and reference speed 5300 1/min. Being single-direction, it must not be exposed to radial load or to axial load acting from the opposite side, and the two flat washers require a properly aligned seat and constant axial preload direction during operation. There is no integral sealing, so lubrication and contamination protection must be provided by the housing design; equivalent designations are SKF 51212, NSK 51212 and NTN 51212.