Super precision bearings belong to some high precision angular contact ball bearings and cylindrical roller bearings.Every end-user who uses super precision bearings all knows it's high-precision bearing,and widely used in machine tools.This kind of bearings are very durable and can be used in many ways,such as face to face,back to back and face to back.Generally,the accuracy class for super precision bearing is P4/P5 degree.Compared to standard angular contact ball bearings, ball screw bearings and spindle bearings have longer life and better reliability.They are much smaller but can support heavier load rating,rely on their best design for among all ball bearings.