Distinction between precision bearing and common bearing:
1. The size requirements are different. The size deviation (inner diameter, outer diameter, ellipse, etc.) of products with high accuracy level is smaller than that of products with low accuracy level;
2. The required value of rotation accuracy is different. The rotation accuracy of products with high accuracy level (i.e. internal diameter run out, external diameter run out, end-to-end run out, etc.) is stricter than that of products with low accuracy level;
3. The required values of surface shape and surface quality are different. The surface shape and surface quality (surface roughness, circular deviation and groove deviation of raceway or raceway) of products with high precision level are stricter than those of products with low precision level;
4. The material properties of products with high precision are better than those of products with general precision.