JDC & JHDC Sprocket with Key Kit (#50 chain) - Sectional

LiftMaster MAXUM JDC/JHDC Sprocket Kits for Sectional Doors

Ensure optimal door performance and safety with the correct LiftMaster sprocket kit for your MAXUM JDC or JHDC commercial jackshaft operator. These sprockets are specifically designed for sectional door installations using #50 chain drive systems.

Correct sprocket selection is critical for achieving the recommended 12 inches per second door speed. Each kit includes a sprocket with a machined bore and keyway to match your shaft diameter and ensure secure torque transmission.

Note: The 3/8-inch keyway sprocket options are for rolling steel doors only and are not applicable to sectional door kits.

Key Specifications

• Chain Type: #50

• Operator Compatibility: LiftMaster MAXUM JDC, JHDC (sectional door installations only)

• Speed Recommendation: Target 12”/second for sectional doors

• Keyway Size: 1/4" standard (sectional)

• Bore Options: 1” and 1.25”

Component Descriptions

• Tooth Count: Determines operational door speed

• Bore: Diameter of the sprocket’s center hole—must match the drive shaft

• Keyway: Machined slot for key insert, ensures torque stability

Available Sprocket Kits for Sectional Doors