1. Basic components of bearings: inner ring, outer ring, rolling elements, cage.

2. Inner ring: often fits closely with the shaft and rotates together.

3. Outer ring: It often fits in a transitional manner with the bearing seat and mainly serves as a support.

4. The material of the inner and outer rings is bearing steel GCr15, and the hardness after heat treatment is HRC60~64.

5. Rolling elements: The rolling elements are evenly arranged in the trenches of the inner and outer rings with the help of cages. Their shape, size, and quantity directly affect the bearing's load-bearing capacity and performance.

6. Cage: In addition to evenly separating the rolling elements, it also serves to guide the rotation of the rolling elements and effectively improve the internal lubrication performance of the bearing.

7. Steel ball: The material is generally bearing steel GCr15, and the hardness after heat treatment is HRC61~66. The accuracy grade is divided into ten grades G (3, 5, 10, 16, 20, 24, 28, 40, 60, 100, 200) from high to low based on dimensional tolerance, shape tolerance, gauge value and surface roughness.