This spindle bearing carries a 25° contact angle and is manufactured to restricted tolerances (P4S), allowing precise adjustment when mounted in pairs or sets. Bore diameter is 20.0 mm, outside diameter 37.0 mm, width 9.0 mm, and net mass 0.04 kg. The cage is made from material designation T, and the bearing has no sealing arrangement, corresponding to the B71904-E-T-P4S-UL designation. The restricted tolerance class and 25° contact angle make this bearing suitable for arrangements requiring high running accuracy and defined axial stiffness, achieved through matched pairing or set configuration. As the bearing is supplied without sealing, external protection and lubrication must be provided by the housing design and the lubrication system used, with the cage material selected for stable performance under the intended speed and load conditions defined by the P4S tolerance grade.