The NACHI 6311ZZ deep groove ball bearing features a 55 mm bore diameter, 120 mm outer diameter, and 29 mm width, constructed from high-quality steel with double metal shields for protection against contamination. It supports a dynamic load rating of 71,500 N and a static load rating of 44,500 N, suitable for moderate radial and axial loads. Designed for high-speed applications, it operates up to 5,800 rpm with grease lubrication and 6,800 rpm with oil. The bearing includes a stamped steel cage, offers low noise and smooth operation, and withstands temperatures up to 250°F, making it ideal for electric motors, automotive, and industrial machinery. Weight is approximately 1.38 kg.