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The LiftMaster 71-1550B42QGH Sprocket Kit is a precision-engineered 42-tooth drive sprocket designed for LiftMaster operator systems that utilize a 1.25" shaft with a 1/4" keyway. Correct tooth count and bore sizing ensure secure mounting, accurate chain engagement, and dependable power transmission throughout the drive assembly.
Built for durability in commercial and high-cycle environments, this sprocket helps maintain proper drive alignment while minimizing wear on chains and related components. Replacing worn sprockets with the correct specifications supports efficient operation and long-term reliability of the operator drive system.
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