YRTC high precision rotary table bearing series break through the traditional bearing selection and layout. One bearing can meet the requirement of composite load, can simplifies the rotary table’s structure, reduces the cost of designing, mounting and maintain. The bearing compose of one group of rollers in radial direction, two groups of thrust-rollers in axial direction, and the cage. That makes the structure compact, save much space for the rotary table, the mounting holes make the mounting very easy, the bearing also can be assembled with preload before leaving factory, so the bearings need not to be adjusted the clearance after that. The bearings have high rigidity and high rotary accuracy, both inner ring and outer ring have oil holes, which is very convenient for greasing regularly. The rotary accuracy of HRT bearings can reach to 1.5μm, which is much more sophisticated than that of common bearings