Ball bearing is a kind of rolling bearing, which is installed between the inner steel ring and the outer steel ring and can bear a large load. Also known as ball bearings. Used in places where the bearing capacity is not large and the economy is required.

Roller bearings are rolling bearings with short cylindrical, conical or waist-drum rollers as rolling elements. There are mainly centripetal short cylindrical rollers, double-row centripetal spherical rollers, tapered rollers and thrust rollers. This kind of roller is mainly used in cylindrical roller bearings, and roller components can also be directly used in machinery. This kind of roller has been standardized in size and can be used as a commodity roller for designers and users to choose.