Ball bearings are a type of rolling bearing, with ball bearings installed between the inner and outer steel rings, capable of withstanding large loads. Also known as ball bearings Ball bearings are mainly composed of four basic components: balls, inner rings, outer rings, and cages or retainers. General industrial ball bearings meet the AISI 52100 standard, and the balls and rings are usually made of high chromium steel with a Rockwell C-scale hardness of approximately 61-65. The hardness of the retainer is lower than that of the ball and ring, and its materials include metal (such as medium carbon steel, aluminum alloy) or non-metal (such as Teflon, PTEF, polymer materials). Ball bearings have lower rotational friction resistance than journal bearings, so at the same rotational speed, the temperature generated by friction will be lower.
