Like other bearings, angular contact ball bearings are also have lots of structures, single row angular direction, While double row angular contact ball bearings in DB or DF combination and four-point contact ball bearings can accommodate radial load and axial load in two directions. Angular contact ball bearings suit high-speed rotation and high-precision rotation. These bearings are mainly used in the fields like machine tool spindles, high frequency motors, oil pumps, air compressors, printing machines, etc. For four-point contact ball bearings are mostly used in the roller-boxes of rolling mills to carry axial load.