The LiftMaster 15-48B18TKK is an OEM sprocket for chain-driven commercial door operators, identified by the 48B18T designation with an 18-tooth configuration. It features a 1-3/16 inch bore and a 5/16 inch keyway to mount securely on compatible operator shafts, transmitting power from the operator output to the drive chain. This replacement part is intended for restoring smooth, reliable motion in LiftMaster commercial jackshaft and similar chain-drive assemblies where the original sprocket has worn or failed.
For proper application, match the tooth count, bore and keyway dimensions, and the 48B18T designation to the component specified in your operator’s parts manual. Installation should be performed by a qualified technician: confirm shaft-fit with the correct key, align the chain to prevent premature wear, secure the sprocket per manufacturer recommendations, and verify door travel and safety functions after service. Always follow lockout/tagout procedures and the official LiftMaster service documentation for the specific operator model.