The LiftMaster 19-5112 is an OEM #41 drive chain configured for a 12' door, designed for LiftMaster chain-drive trolley operators. It transmits motion from the opener sprocket to the trolley, helping raise and lower sectional overhead doors smoothly and reliably. This replacement part is intended for systems that specifically call for #41 chain on a 12-foot door setup, making it a direct-fit solution for restoring proper travel and reducing chatter or slipping in worn chain assemblies.
Use this chain on compatible LiftMaster commercial or tall residential chain-drive openers that reference part number 19-5112 in their parts manual. It is not intended for belt-drive or screw-drive units, nor for operators that require a different chain type. For best results, follow the opener’s service instructions: disconnect power, relieve tension, install the chain with the correct connector, set proper chain tension, align the opener limits, and apply appropriate chain lubrication as recommended by the manufacturer. Always verify compatibility in your operator’s documentation before ordering to ensure the correct replacement part for your 12' door application.