Self-aligning radial ball bearings withstand bidirectional radial and axial loads and are not separable. The outer ring has a spherical raceway, two rows of balls (which in some cases, with a brass cage, may protrude slightly laterally to the bearing) which are held and guided by a cage which can be in polyamide reinforced with glass fibre for operating temperatures up to + 120 ° C, or in brass for operating temperatures from -30 ° C up to + 150 ° for bearings without shielding and up to + 100 ° C if the abovementioned screens are present. The inner ring can have a cylindrical hole or with a taper of 1:12. These bearings can be mounted directly on the conical shaft or on a cylindrical shaft, in the latter case through an adapter sleeve and ring nut with safety washer.