Angular contact ball bearings can be divided into single-row and double-row. Angular contact bearings can be loaded radially and axially, however, unlike plain bearings, forces can only be transferred in one direction. Single row bearings are mounted in pairs or in series, face-to-face or face-to-face arrangements. Their operating angle is 40 degrees. In turn, double row angular contact ball bearings are characterized by the transmission of large radial and axial loads.