Product Description
The Genie 086446.3120.S is a factory replacement #50 roller chain sprocket assembly for Genie commercial gate and door operators Models J (Jackshaft), H (H-Rail trolley), and GH (Gear Head Hoist). This variant features 31 teeth with a 1-1/4 inch bore diameter, designed to mate with #50 roller chain (5/8 inch pitch). The 1-1/4 inch bore accommodates the specific shaft diameter found on qualifying J, H, and GH operator drive assemblies. Selection of the correct tooth count allows the installer to configure the appropriate drive ratio for the gate weight, travel distance, and desired cycle speed of the application. Genie offers this same 1-1/4 inch bore sprocket family in five tooth counts (31T, 36T, 40T, 48T, and 60T) to cover the full range of commercial gate operator drive requirements.
Key Features
- #50 roller chain compatibility with 5/8 inch chain pitch for standard commercial gate operator drivetrains
- 31-tooth drive sprocket providing mid-range speed and torque balance for Models J, H, and GH operators
- 1-1/4 inch bore diameter machined to fit the corresponding drive shaft variant on Genie commercial operators
- Part of a complete bore family alongside 1 inch and 1-3/8 inch bore variants of the same 31-tooth sprocket
- Interchangeable within a broader sprocket lineup including 36T, 40T, 48T, and 60T options in the 1-1/4 inch bore size
- Engineered as a direct OEM replacement assembly to maintain drivetrain integrity and chain alignment
Compatibility Guide
- Genie Model J Jackshaft Commercial Gate Operator
- Genie Model H H-Rail Trolley Commercial Gate Operator
- Genie Model GH Gear Head Hoist Commercial Gate Operator
Professional Specs
| Feature | Specification |
|---|
| Model | Genie 086446.3120.S |
| Item Type | Sprocket Assembly |
| Materials | Steel (hardened sprocket body typical of #50 industrial roller chain sprocket assemblies) |
| Dimensions | 1-1/4 inch bore diameter, 31 teeth, #50 chain pitch 5/8 inch |
| Mounting | Shaft-mount, 1-1/4 inch bore with standard keyway and set-screw retention typical of roller chain sprocket assemblies |
| Alternate Part Numbers | 086446-3120-S, 0864463120S, 086446.3120.S |
Frequently Asked Questions
Q: What chain pitch is required for this sprocket?
A: This sprocket is designed exclusively for #50 roller chain, which has a 5/8 inch pitch. Using a different chain pitch will result in improper meshing, accelerated wear, and potential drivetrain failure.
Q: What other bore sizes are available for this 31-tooth sprocket?
A: The 1-1/4 inch bore is one of three bore sizes offered for 31-tooth #50 sprockets in the Genie commercial operator lineup. The same tooth count is also available in 1 inch bore and 1-3/8 inch bore variants to accommodate different shaft diameters on Models J, H, and GH operators.
Q: How does the 31-tooth count affect operator performance?
A: Tooth count determines the gear ratio between the drive shaft and the driven shaft. A 31-tooth sprocket is a mid-range selection that balances operator speed and torque output. Lower tooth counts such as 36T, 40T, 48T, and 60T are used when additional torque multiplication or speed reduction is required for heavier or larger gates.
Q: Are there other tooth-count options in the same 1-1/4 inch bore family?
A: Yes. Within the same #50 chain family for 1-1/4 inch bore, compatible sprockets include 36T, 40T, 48T, and 60T variants, allowing integrators to configure the appropriate drive ratio for specific gate weight and speed requirements.
Q: What should I verify before installing this sprocket on my Genie operator?
A: Verify the shaft diameter on your Model J, H, or GH operator matches the 1-1/4 inch bore of this assembly. Also confirm that the existing drive chain is #50 (5/8 inch pitch) before installation to ensure proper fit and engagement.
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