Compared with conventional motors, the control ability of servo motors has been greatly improved, which can make the control speed and position precision very accurate; it has very strict requirements for bearing performance. GBB servo precision bearings and deep groove ball bearings characterized with low vibration noise, low friction torque, and good self-sealing performance, especially for 4P deep groove ball bearings, the axial clearance is less than 30μm with two-way load capacity, and easy for installation.