The LiftMaster 15-41B40LGH sprocket, also referenced as 41B40T, is a genuine OEM replacement drive component for select LiftMaster commercial door operators. Identified by the 41B40T designation used for roller chain drive components, this sprocket is configured for #41 chain and a 40-tooth profile to deliver smooth, consistent power transmission between the operator and door shaft. The “1"B” callout in the part name indicates a finished bore intended for a 1-inch keyed shaft, supporting dependable engagement in chain-driven LiftMaster gearhead and jackshaft applications.
Ideal for maintaining or restoring performance on commercial and industrial sectional or rolling steel doors, this LiftMaster sprocket helps ensure reliable operation when paired with the correct chain and mating sprocket. Installation should follow the operator’s service manual: disconnect power, align the sprocket with the chain run, mount on the keyed shaft, secure fasteners to specification, and set proper chain tension and lubrication. After replacement, verify door balance, travel limits, and entrapment protection. For safety and compliance, service should be performed by a qualified technician familiar with LiftMaster commercial door operators and #41 roller chain systems.