This spindle bearing is a single-row angular contact type with a 25° contact angle, designed for precision mounting in matched pairs or sets. Bore diameter is 55.0 mm, outside diameter 90.0 mm, width 18.0 mm, and net mass 371.84 g. It features non-contact lip seals on both sides and a T-type cage, with restricted tolerances corresponding to P4S accuracy class. The 25° contact angle allows the bearing to carry combined radial and axial loads while maintaining stiffness under precision operating conditions. The restricted tolerances and P4S accuracy class support high-speed rotation with minimal runout, and the non-contact lip seals limit friction while keeping contaminants out. Since it is intended for use in matched pairs or sets, correct adjustment during mounting is required to achieve the specified preload and running accuracy.