Carries axial loads in one direction only and locates a shaft against a flat housing seat, transferring thrust through a single row of balls running between two flat washers. The bearing has a height of 38.0 mm, a net mass of 2.338 kg, a limiting speed of 2650.0 1/min and a reference speed of 3250.0 1/min. The cage is a steel sheet metal design, designation JP. Being a single-direction deep groove ball bearing, it must be paired with a radial bearing to locate the shaft laterally, as it takes no radial load itself. The flat raceways require the shaft and housing washers to be properly aligned and kept under a minimum axial load to avoid ball skidding. Dimensional and design equivalents: SKF 51222, NSK 51222, NTN 51222.