The difference between precision bearings and ordinary bearings is mainly reflected in the different dimensional requirements. Precision bearings have high precision and their dimensional deviation is better than that of products with low precision grades. The precision requirements for the rotation of bearings during use are different. The rotation control of precision bearings is much higher than that of ordinary bearings. The surface shape and surface quality requirements are different. The surface shape and surface quality of high-precision products are stricter than the requirements of low-precision products. The raw materials for manufacturing precision bearings are more stringent than those for general bearings. Precision bearings usually require the use of materials with better steel performance to ensure their stability and durability in long-term use. The installation of precision bearings is more stringent than that of ordinary bearings. In particular, it is important that the matching accuracy between the bearing and the shaft must reach the same level. If the matching parts of the precision bearings do not meet this requirement, the error of the precision bearings after installation will often be several to more than 10 times larger than that of the original bearings, and it is not a precision bearing at all.