Angular contact ball bearings are able to support radial load and axial load. As single row angular contact ball bearings can only support axial load in single direction, matched bearing mounting is often adopted to them. As to matched pair of bearings, preload for them is more convenient. Retainersare is made of brass, synthetic resins or other material , which is subject to bearing features and application conditions.Single row angular contact ball bearings are used for machine tool spindles, high frequency motors, gas turbines, centrifuges, small car front wheel, the differential pinion shaft .Double-row angular contact ball bearings are applied for pump, blower, air compressor, various types oftransmission, fuel injection pumps, printing machinery