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The LiftMaster 71-1550B72QKH Sprocket Kit is a precision-engineered 72-tooth drive sprocket designed for LiftMaster operator systems that utilize a 1.25″ shaft with a 3/8″ keyway. The increased tooth count supports smooth power transmission and chain engagement even under heavy-duty and commercial-grade applications.
Built for durability in high-cycle environments, this sprocket helps maintain proper drive alignment while reducing wear on chains and associated components. Replacing worn drive sprockets with the correct bore size, keyway, and tooth count supports efficient operation and long-term reliability of the operator drive assembly.
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