The FAG B71901-E-T-P4S-DTL is a genuine high-precision angular contact ball bearing set, specifically designed as a spindle bearing. This duplex tandem arrangement (DTL) set features two bearings with a 25° contact angle (E), a phenolic resin cage (T), and P4S precision (ISO tolerance class 4 with enhanced running accuracy). With a bore diameter of 12 mm, an outer diameter of 24 mm, and a total width of 12 mm (6 mm per bearing), this bearing set provides light preload (L) for optimal performance in demanding high-speed applications requiring exceptional rigidity and accuracy.