The Nachi 6311 deep groove ball bearing is a high-performance radial bearing designed for demanding industrial applications, featuring a 55 mm bore, 120 mm outer diameter, and 29 mm width for robust fitment in a wide range of machinery. Constructed from durable chrome steel (JIS SUJ2), it offers a dynamic load rating of 71,500 N and a static load rating of 44,500 N, ensuring reliable operation under heavy radial loads. Available in open, single-shielded (Z), double-shielded (ZZ), and double-sealed (2RS) configurations, this bearing supports high rotational speeds up to 4,000 RPM with grease lubrication and operates efficiently in temperatures up to 120°C. Its precision grade P0 and C3 internal clearance provide smooth, low-friction performance, while options like steel cages and various seal types enhance longevity and protection against contaminants. Ideal for motors, pumps, and conveyors, the 6311 series combines durability, precision, and versatility for critical electrical and mechanical systems.