The raceways of both the outer and inner rings of this bearing type are made with a set contact angle. A number of balls could be set up than in the instance of Deep-groove ball bearings, since the balls are inserted using counter-bore construction. Standard cage substances may be scraped on steel, high-strength brass, or synthetic resin. Cage material depends on the bearing service or series and requirement. Single-row Angular Contact ball bearings can sustain loads any axial load has to be in one direction. This bearing type is generally used in pairs to deal with the load resulting from the axial force generated by the applied load. When mounting two single bearings in adjacent positions, NACHI provides these combination components (pairs) with pre-adjusted clearance. Paired combination bearings are sets. Blend or paired bearings can be ordered BACK-TO-BACK (DB), FACE-TO-FACE (DF), or in TANDEM (DT). Bidirectional axial loads can be sustained by DF or DB sets.