KOYO 22052RS Self Aligning Ball Bearing, Inner Dia 25mm, Outer Dia 52mm, Width 18mm

The outer ring raceway of self-aligning ball bearings forms a spherical surface whose center is common to the bearing center
The inner ring of the bearing has two raceways
The balls, cage, and inner ring of these bearings are capable of a shifting in order to compensate for a certain degree of misalignment with the outer rings
As a result, the bearing is able to align itself and compensate for shaft / housing finishing unevenness, bearing fitting error, and other sources of misalignment
However, since axial load capacity is limited, self-aligning ball bearings are not suitable for applications with heavy axial loads
Furthermore, if an adapter is used on the tapered bore ofthe inner diameter, installation and disassembly are much simpler and for this reason adapters are often used on equipment with drive shafts