This deep groove ball bearing carries radial loads on a thin-section cross-section, with a bore of 105.0 mm, an outside diameter of 130.0 mm and a width of 13.0 mm, giving a net mass of 0.33 kg. The single row of balls runs in a steel sheet metal cage (JN), and the limiting speed reaches 7100.0 1/min, with a reference speed of 3900.0 1/min. Radial internal clearance is set to C2 (Group 2), narrower than the standard clearance range. The reduced internal clearance suits applications where shaft and housing fits already introduce some preload, keeping operating clearance within the intended working range. The thin ring cross-section (series 618) allows installation where radial space is limited, while the sheet metal cage keeps rotating mass low at the stated speeds. No seals or shields are fitted, so lubrication and contamination protection must be provided externally. Equivalent designations: SKF 61821/C2, NSK 61821C2, NTN 61821C2.