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This is a genuine Omega screw for the balance bridge of Caliber 8500 (and 8501), part number 7228500A3536, Swiss‑made. As a critical fastener securing the balance bridge, this screw ensures stable positioning of the balance assembly within the movement, making it essential for maintaining the timing accuracy of the 8500/8501 Co‑Axial caliber. This original factory part is the ideal choice for watchmakers to replace worn, stripped, or damaged original screws during service or repair.
Genuine Omega Part – Swiss factory‑original for Caliber 8500/8501, not a copy.
Balance Bridge Securing Core – A critical fastener ensuring precise and stable positioning of the balance assembly.
Precision Machined – Made of quality steel with accurate thread profile for secure tightening and vibration resistance.
Essential for Service – Replaces stripped, damaged, or lost original screws to restore movement integrity.
Compatible Movement – Designed for Omega Caliber 8500 and its derivatives (8501, etc.) Co‑Axial automatic movements.
| Parameter | Details |
|---|---|
| Part Name | Balance Bridge Screw |
| Part Number | Omega 7228500A3536 |
| Compatible Movements | Omega Caliber 8500, 8501, and related Co‑Axial variants |
| Function | Secures the balance bridge to the mainplate |
| Material | High‑quality hardened steel |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Omega Caliber 8500 automatic Co‑Axial (found in Seamaster, De Ville, Constellation collections).
Omega Caliber 8501 automatic Co‑Axial (precious metal version with 18K red gold rotor and balance bridge).
Replacement of aged, stripped, or damaged balance bridge screws during movement service.
Repair of balance bridge misalignment or balance staff breakage caused by loose or damaged screws.
1. Is this a genuine Omega balance bridge screw?
Yes. It is a Swiss factory‑original part (7228500A3536) for Caliber 8500/8501, not a copy.
2. Does this screw fit all 8500 variants (8500, 8501, 8500G)?
Yes. The balance bridge screw is common across the 8500 series. Caliber 8501 shares the same bridge design.
3. What are the symptoms of a damaged or loose balance bridge screw?
Symptoms: rattling noise from a loose bridge, unstable amplitude, degraded timekeeping accuracy, or even a broken balance staff.
4. What should I pay attention to during installation?
Use a properly fitting precision screwdriver. Apply even, moderate torque (a torque‑controlled screwdriver is recommended). Professional watchmaker assistance is strongly advised.
5. Does this screw fit other Omega calibers like 8900?
No. The 8900 series has a different balance bridge design; screws are not interchangeable.
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