Yrt Bearing has the characteristics of compact structure, thin wall thickness, light weight, good rigidity, high rotation precision, large load capacity, small starting friction torque and a large number of mounting holes, and has high radial and axial bearing capacity. It is used in high-precision indexing plates, rotary tables for machine tools or precision machinery, etc. Most of the traditional indexing discs need three sets of bearings to ensure their axial and radial precision. They are large in size, heavy in weight and consumable. This bearing can meet the requirements of high-precision indexing and rotation. There are certain requirements for the tightening torque of the screws during installation.