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Tensioning Bearings are used in the timing belt and auxiliary drive belt to adjust the belt tension or change the belt running path. These come with a long service life even under high-speed rotation and high-temperature conditions, and their high-strength resin pulleys help to reduce the weight. Tensioning Bearings consist of a base, tensioner arm, spring, and pulley. It provides pressure to a timing belt that drives other pulleys while easing the strain on that belt.