1. Product Overview The 7201T2DB is factory pre-ground matched DB back-to-back duplex angular contact ball bearing. T2 stands for glass fiber reinforced nylon high-speed cage, standard 20° contact angle open design. DB back-to-back pairing widens the force action span, delivers outstanding bidirectional axial rigidity and strong anti-tilting capacity, specially developed for miniature high-speed spindles, precision testing instruments and small automation rotary shafts