Transmits axial load in a single direction through a stack of two washers and a ball-and-cage assembly, height 25.0 mm and net mass 1.06 kg. The cage is executed in sheet steel, designation JP. Limiting speed is rated at 3350 1/min, with a reference speed of 2800 1/min. Being single-direction only, this deep groove ball bearing must be paired with a radial bearing to locate the shaft, as it cannot support radial load or reverse thrust. The steel sheet metal cage keeps the design compact and suited to moderate speeds within the stated limits; no seals or integrated lubrication are provided, so lubricant supply and sealing must be arranged externally. Dimensionally and constructionally interchangeable with SKF 51122, NSK 51122, and NTN 51122.