The Nachi 7204B angular contact ball bearing features a 20mm inner diameter, 47mm outer diameter, and 14mm width, designed for high precision with an ISO P0 (ABEC 1) rating. It has a 40° contact angle, enabling it to support combined axial and radial loads efficiently. The bearing uses JIS SUJ2 steel for the inner ring and a JIS SPCC steel cage, with a dynamic load capacity of 13,700 N. It operates at limiting speeds up to 11,000 RPM with grease lubrication and 16,000 RPM with oil. This open, single-row bearing is suitable for applications requiring moderate to high-speed performance and durability.