The HFH B71903-E-T-P4S-UL is a high-precision angular contact ball bearing designed for demanding machine tool spindle applications. This bearing features a 17 mm bore diameter, a 35 mm outer diameter, and a 10 mm width. It is constructed with ceramic balls (hybrid design) for enhanced performance, higher speed capabilities, and reduced friction. The 'E' suffix indicates an optimized internal design, 'T' signifies a phenolic resin cage, 'P4S' denotes a precision class higher than P4 (ABEC 7), and 'UL' indicates a universal arrangement for single or paired mounting without shims. It has a 25° contact angle, making it suitable for high-speed and high-rigidity requirements in precision machinery.