Carries radial and moderate axial loads through a single row of balls running in deep grooves, providing self-retaining action between inner and outer rings. The bearing has a bore diameter of 40.0 mm, outside diameter of 90.0 mm, and width of 23.0 mm, weighing 0.632 kg. It uses a steel sheet metal cage (JN) and features seals on both sides, with a limiting speed of 4800.0 1/min and radial internal clearance CN (Group N). The integrated seals keep grease in and contaminants out, making relubrication unnecessary under normal operating conditions and allowing installation without additional external sealing. Standard CN clearance suits typical fits and moderate thermal expansion, and the sheet metal cage guides the balls reliably at the stated speed limit. Dimensionally and constructionally, this bearing corresponds to SKF 6308-2RS1, NSK 6308DDU, and NTN 6308LLU.