The LiftMaster 15-48B24AXX is an OEM replacement sprocket specified as 48B24T for 3/8" B chain, used in chain-driven LiftMaster commercial and industrial door operators. This sprocket transmits torque within the chain-reduction stage, helping drive the operator’s output shaft smoothly and reliably. It is intended for service and repair scenarios where the original sprocket is worn, damaged, or part of scheduled maintenance, restoring proper chain engagement and efficient power transfer in applications such as jackshaft, hoist, and trolley operators.
Designated for use with 3/8-inch British Standard roller chain, this component should be matched to the exact operator model and drivetrain configuration noted in the manufacturer’s parts diagram to ensure correct hub style, tooth profile, and chain compatibility. During installation, follow LiftMaster service procedures: de-energize and lock out the operator, align the sprocket with the mating chain and companion sprockets, verify chain tension, and secure all fasteners to prevent slip or premature wear. This genuine LiftMaster sprocket (15-48B24AXX / 48B24T, 3/8" B) is suited for demanding commercial duty where dependable chain engagement and long service intervals are priorities.