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Product Description2209 K NSK Self Aligning Bearing Self aligning bearings has two rows of balls and a common concave sphered raceway in the outer ring. This means that the bearings are self-aligning and are therefore insensitive to angular misalignments. It is well suited to applications where considerable shaft deflections or misalignment are anticipated. In addition, the self-aligning ball bearing has the lowest friction of all rolling bearings which enables it to run cooler even at high speeds.