Good bearings usually have these characteristics: uniform density, round shape, low thermal deformation, and high strength. The bearings of advanced equipment are mostly made of aluminum alloy.

1. Determination of bearing type and configuration. (The reference factors are: bearing installation space; bearing load size, direction and nature; speed; rotation accuracy; noise and friction torque; rigidity; relative tilt of inner ring and outer ring; installation and disassembly; bearing configuration; market Sex and economy).

Bearing steel is used to make bearing balls, roller and rings. Usually, bearings under great pressure and friction during operation, therefore, steel must has a strong performance of have high, uniform hardness, wear resistance and high elastic limit.