Rolling mill bearings refer to products used in the rolling industry, including non-ferrous metals, ferrous metals, and non-metallic products. Used for bearings at the roll diameter and on the drum of the rolling mill system. Usually, four row cylindrical roller bearings are used to bear radial loads, while thrust roller or thrust ball bearings, as well as radial angular contact ball or radial roller bearings, bear axial loads. Nowadays, most lubrication and cooling methods are used, such as oil gas lubrication, oil mist lubrication, and grease.