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Self-aligning ball bearings with an extended inner ring are axially located on the shaft by means of a pin or shouldered screw ,which engages in a slot at one side of the inner ring and also prevents the inner ring from turning on the shaft.When two self-aligning ball bearings with an extended inner ring are used to support a shaft, they should be positioned so that the inner ring slots either face each other, or are at the outboard positions of the bearings .If this is not the case, the shaft is axially located in one direction only.