Tapered roller bearings are separable bearings. Both the inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into single-row, double-row and four-row tapered roller bearings according to the number of rows installed. Single row tapered roller bearings can bear radial load and single direction axial load. The most used tapered roller bearing is the single row tapered roller bearing. Small-sized double-row tapered roller bearings are used in the front wheel hubs of cars. Four-row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills. Tapered roller bearings are widely used in industries such as automobiles, rolling mills, mining, metallurgy, and plastic machinery.