The FAG B71909-E-T-P4S-DTL is a high-precision angular contact ball bearing designed for spindle applications. This bearing features a 45 mm bore, 75 mm outer diameter, and 16 mm width. It is part of FAG's 719 series, known for high speed capability and rigidity, making it suitable for machine tool spindles and other precision rotating equipment. The 'E' suffix indicates an optimized internal design, 'T' for a phenolic resin cage, 'P4S' for a higher precision class than P4, and 'DTL' signifies a matched set of two bearings arranged in a tandem and back-to-back configuration with light preload.