The FAG B71921-C-T-P4A-UL is a high-quality single row angular contact ball bearing designed for machine tool spindles and other high-speed, high-precision applications. This genuine FAG bearing features a 105 mm bore diameter, 145 mm outer diameter, and 20 mm width. It has a 15° contact angle (C), a phenolic resin cage (T), and P4A precision class, indicating very high running accuracy. The 'UL' designation signifies universal matching, allowing for arbitrary arrangement of single bearings or sets without special selection for paired mounting. This bearing is suitable for applications requiring high rigidity, low friction, and excellent rotational accuracy.