Nachi Angular Contact Ball Bearing, Bore Dia 55 mm, Outer Dia 120 mm, Width 29 mm, Open

The 7311B angular contact ball bearing features a 55 mm bore diameter, 120 mm outer diameter, and 29 mm width, with a 40° contact angle designed to handle combined radial and axial loads efficiently. It has a dynamic load rating around 85-87 kN and a static load rating near 56.5 kN, supporting speeds up to 7300 RPM with oil lubrication. The bearing includes a phenolic or pressed steel cage for lightweight strength and high-speed performance, weighs approximately 1.42 kg, and operates within -40°C to 120°C. Its precision design suits applications in machine tools, electric motors, gearboxes, and wind energy systems.