Recently, ZYS precision slewing bearing for large diameter telescope got the acceptance form the expert group. The bearing with heavy load and low friction was developed by ZYS itself. The key technical index of the rotating precision, friction torque reached the requirements of the precision slewing bearing, and could meet the requirements of the host machine. The quality in leading level of China filled the domestic blank.

The bearing, the outside diameter of which is about 4 meters, is a kind of double-row different ball diameter slewing bearing. It requires high load carrying capacity, high precision, low friction torque, reliable sealing and lubricating.