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Self-aligning ball bearings have two rows of balls and a common sphered raceway in the outer ring. The bearings are in a literal sense self-aligning and insensitive to shaft deflections and angular misalignment of the shaft relative to the housing. Additionally, self-aligning ball bearings generate less friction than any other type of rolling bearing, which enables them to run cooler even at high speeds.
Self-aligning ball bearings are available with either a cylindrical or tapered bore and come in sealed or open designs.
Self-aligning ball bearings are available in several designs, including: