This spindle bearing is a single-row angular contact ball bearing with a 25° contact angle, designed for precise axial and radial load support under a defined preload. Bore diameter is 40.0 mm, outside diameter 80.0 mm, width 18.0 mm, and net mass 0.36 kg. It is fitted with a T-type cage and supplied without sealing, matched for mounting in pairs or sets under the UL configuration. The restricted tolerances and P4S accuracy class allow for high-precision alignment and stable running at elevated rotational speeds, making the bearing suitable for arrangements requiring minimal radial and axial play. As it is supplied without sealing, external protection and lubrication must be provided by the housing design, typically through oil lubrication suited to high-speed operation. The paired or set mounting ensures controlled preload distribution, maintaining stiffness and accuracy across the bearing arrangement.