Single row angular contact ball bearings can only bear axial load in one direction. When it bears radial load, it will cause additional axial force, so it is always used in pairs.
The double row angular contact ball bearing can bear the radial and axial combined load with the radial load as the main load.
Single row angular contact ball bearings are mainly used in food machinery, electrical equipment, coating equipment, high frequency motor, centrifugal separator, machine tool spindle, etc.
Double row angular contact ball bearing is mainly used in oil pump, printing press, food packaging machinery, electric welding machine, fine chemical machinery, etc.