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The outer ring raceway of double row 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 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.
Since axial load capacity is limited, self-aligning ball bearing are not suitable for applications with heavy axial loads.
The ISO class 1200, 1300, 2200 and 2300 series double row self-aligning ball bearings are available with straight bore and tapered bore ("K" suffix) inner races for various shaft mount applications.