Ball bearing is a kind of rolling bearing that reduces the friction in the process of power transmission and improves the efficiency of mechanical power.

Rolling mill bearings refer to the rolling industry bearings used for the rolling of non-ferrous metals, ferrous metals and non-metal products, including the bearings used at the diameter of the rolling roll and on the drum. It usually adopts four-row cylindrical roller bearings to bear radial load, thrust roller or thrust ball bearings and radial angular contact ball or radial roller bearings to bear axial load. At present, oil-air lubrication or oil mist lubrication and grease are mostly used for lubrication and cooling.

With the continuous development of technology and intelligent manufacturing, the use of faster, more accurate and more automated machinery and equipment in the medical and industrial fields will become more and more popular, and the demand for precision bearings will also increase.