Self-aligning ball bearings have two raceways on the inner ring and one spherical raceway on the outer ring. They can accommodate considerable misalignment due to shaft deflection or inaccurate shaft or housing machining.
Self-aligning ball bearings are made with a cylindrical or tapered bore. Tapered bore bearings are often fixed onto shafts using an adaptor sleeve.
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Self-Aligning Ball Bearing (1203)