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The Omega 8500 Movement Ratchet Wheel (7228500A31020) is a genuine Swiss-made component for the Omega Caliber 8500 Co-Axial automatic movement. This ratchet wheel is a critical part of the dual-barrel winding system, working together with a paired ratchet wheel and the transmission wheel to facilitate the transfer of winding torque between the two series-coupled barrels . It is listed as a service part for Caliber 8500A in the official Omega technical documentation .
Genuine Omega part – authentic Swiss-made component listed for Caliber 8500A
Dual-barrel system component – works with a second ratchet wheel for series-coupled winding torque transfer
Critical for 60-hour power reserve – forms part of the dual-barrel mechanism
Service replacement part – recognized in official Omega technical documentation
Part Number: 7228500A31020
Compatible Movement: Omega Caliber 8500A
Movement Diameter: 29.00 mm
Movement Height: 5.5 mm
Jewels: 39
Frequency: 25,200 vph (3.5 Hz)
Power Reserve: 60 hours (two series-coupled barrels)
Winding System: Bi-directional automatic with dual barrels
Origin: Switzerland (Omega factory part)
Condition: Brand new
Service and overhaul of Omega Caliber 8500A movements
Winding system repair – replacing worn or damaged ratchet wheels
Power reserve restoration – ensuring proper torque transfer between the two barrels
Restoration of De Ville Hour Vision, Seamaster Aqua Terra, Constellation, and other 8500-powered models
Suitable for professional watchmakers and authorized service centers
1. Is this a genuine Omega part?
Yes, this is a genuine Omega factory part (reference 7228500A31020), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list for Caliber 8500A .
2. Which movement versions is this component compatible with?
This ratchet wheel is specifically listed for Omega Caliber 8500A in the technical documentation . For other versions (8500B, 8500G, and 8900), different references may be required. Please verify your movement version before ordering.
3. What is the function of the ratchet wheel in the Caliber 8500?
The ratchet wheel works with a second ratchet wheel in the dual-barrel system to transfer winding torque between the two series-coupled barrels . This is essential for the movement’s 60-hour power reserve.
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