JDC & JHDC Sprocket with Key Kit for Rolling Steel Doors (#50 Chain)

LiftMaster MAXUM JDC/JHDC Sprocket Kits for Rolling Steel Doors

Complete your LiftMaster MAXUM JDC or JHDC commercial jackshaft operator installation with the correct sprocket kit for rolling steel door applications. These kits are specifically engineered to work with #50 chain systems and ensure your door operates at the ideal speed of 8–9 inches per second.

Whether you’re managing insulated or uninsulated rolling doors, these heavy-duty sprockets feature precisely machined bores and keyways to maintain torque, prevent slippage, and extend operator longevity.

Note: The 3/8" keyway options are exclusive to rolling steel door kits and not applicable to sectional door setups.

Key Product Highlights

• Door Compatibility: Rolling steel doors (insulated & uninsulated)

• Operator Compatibility: LiftMaster JDC and JHDC MAXUM Series

• Chain Type: #50 roller chain

• Speed Goal: 8–9 inches per second (safe rolling door speed)

• Keyway Types: 1/4" and 3/8"

• Bore Sizes: 1" and 1.25"

Function & Sizing Notes

• Tooth Count: Affects door travel speed

• Bore: Matches the shaft diameter (critical for torque transmission)

• Keyway: Machined slot for retaining keys—ensures tight fit and secure power delivery

Available Sprocket Configurations – Rolling Steel Doors