The LiftMaster 15-50B18TKK sprocket is an authentic OEM drive component engineered for chain-driven LiftMaster operators. Identified as 50B18T, it is designed for ANSI #50 (5/8 in pitch) roller chain with an 18-tooth B-hub configuration and a finished 1-1/2 in bore with a 3/8 in keyway. Commonly found in commercial jackshaft and trolley-style setups, this replacement sprocket helps restore smooth, consistent power transmission in LiftMaster commercial garage door operators and other chain-drive assemblies that specify a 50B18T profile.
Intended for professional service and maintenance, installation involves mounting on a keyed shaft that matches the 1-1/2 in bore and 3/8 in keyway, aligning with the mating chain sprocket, and setting proper chain tension per the operator’s manual. For best results, confirm fitment against your operator’s parts diagram or service documentation, especially when servicing commercial and industrial overhead door systems that use ANSI #50 roller chain. Follow standard lockout/tagout procedures, verify chain alignment, and use appropriate guarding after installation. This LiftMaster OEM replacement part is a dependable choice for technicians seeking a like-for-like drive sprocket on compatible LiftMaster chain-drive operators.