single row angular contact ball bearings can accommodate axial loads in one direction only. This type of bearing is typically adjusted against a second bearing. Their bearing rings have an upper and a lower shoulder and are non-separable.

Single row angular contact ball bearings in pairs are designed to withstand both radial and axial loads, as well as pure radial loads and axial loads in either direction. The single row angular contact ball bearings are selected by the manufacturer according to a certain preload requirement, and are provided in pairs for use by the user.