This spindle bearing is a single-row angular contact ball bearing with a 25° contact angle, designed for precise adjustment in pairs or sets. Bore diameter is 10.0 mm, outside diameter 26.0 mm, width 8.0 mm, and net mass is 15.0 g. The cage is executed in version T, and the bearing has no sealing, running open. Tolerances are restricted, matching class P4S. The design, with its defined contact angle and matched-pair capability, allows the bearing to take up combined loads while maintaining precise axial positioning when mounted as a set. The absence of sealing means lubrication and contamination protection must be provided externally, and the restricted tolerances of P4S support high running accuracy and low radial and axial runout, consistent with the intended adjusted mounting arrangement.