LiftMaster Sprocket Kit, 42 Tooth, 1" Bore X 1/4" Keyway | LIF-71-1550B42LGH

71-1550B42LGH is a 42 Tooth Sprocket Kit (1" Bore x 1/4" Keyway), for
#50 chain. For use as a door sprocket and compatible with LiftMaster® MAXUM Standard
and Extended Duty JDC/JHDC, and Logic 4.0/5.0 Commercial Door Operators. 

Kit includes shaft key.

Genuine LiftMaster^® replacement part.