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The LiftMaster 71-1550B50QKH Sprocket Kit is a precision-engineered 50-tooth drive sprocket designed for LiftMaster operator systems that utilize a 1.25" shaft with a 3/8" keyway. The larger tooth count and keyway configuration support smooth, consistent power transmission and effective chain engagement across heavy-duty applications.
Built for durability in commercial and high-cycle environments, this sprocket helps maintain proper drive alignment while reducing wear on chains and related 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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