The rings and rolling elements of the bearing are repeatedly subjected to high contact pressure, while the rolling contact is carried out with the sliding. The retainer is in sliding contact with both sides of the ferrule and the rolling body, or one of them, and bears tensile and compressive forces on the other. Therefore, the material, performance and main requirements for bearing rings, rolling elements and cages are as follows.

Required properties of bearing rings, rolling body materials:

The bearing has high rolling fatigue strength, high hardness and high wear resistance. The performance required by the cage material:

The bearing has good dimensional stability and high mechanical strength. In addition, it also needs good workability. Depending on the application, it is also required to have good impact resistance, heat resistance and corrosion resistance.

Material of bearing ring and rolling body:

Bearing outer ring and rolling body usually use high carbon chromium bearing steel. Most of the bearings use SUJ2 in the JIS steel grade. Large bearings use SUJ3