Deep groove ball bearing 6311-C carries radial and moderate axial loads on a single row of balls running in deep-groove raceways, with a steel sheet metal cage (JN) guiding the ball set. Bore diameter is 55.0 mm, outside diameter 120.0 mm, width 29.0 mm, and net mass 1.297 kg. Limiting speed is 8500 1/min, reference speed 7800 1/min, and radial internal clearance is CN (Group N), the normal clearance group. The Generation C design gives this bearing a thinner cross-section for its bore and outside diameter compared to standard series, which reduces mass while keeping the load-carrying raceway geometry. Normal (CN) clearance suits general mounting conditions without added preload requirements, and the steel sheet metal cage supports the stated speed ratings under standard lubrication. As an open bearing (no seals indicated), it requires external lubrication and protection from contamination appropriate to the mounting arrangement.