The FAG B71904-C-2RSD-T-P4S-UL is a high-precision sealed spindle bearing from INA-FAG (Schaeffler), designed for demanding applications requiring high accuracy and speed. This angular contact ball bearing features a 20mm bore diameter, a 37mm outer diameter, and a 9mm width. It is equipped with seals on both sides (2RSD) to protect against contaminants and retain lubricant, ensuring extended service life. The bearing utilizes a textile laminate cage (T) and belongs to the P4S precision class, indicating very high running accuracy. Its UL designation signifies a universal design for paired mounting with a light preload, making it suitable for various machine tool spindles and other precision rotating equipment.