I-outer spherical ball bearing empeleni iwuhlobo oluthile lwebhola le-deep groove, elibonakala ngobubanzi obuyindilinga bobubanzi bangaphandle beringi yangaphandle, futhi lingafaniswa ne-concave sphere ehambisanayo yesihlalo esiphethe ukuze idlale indima ukuqondanisa. Ukuthwala okuyindilinga kwangaphandle kusetshenziselwa ikakhulukazi ukuthwala umthwalo ohlangene we-radial kanye ne-axial ngokusekelwe kumthwalo we-radial, futhi ngokuvamile awufaneleki ukuthwala umthwalo we-axial wodwa.