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This is a genuine Audemars Piguet automatic bearing click wheel for the Caliber 3120 and 3126 automatic movements, a Swiss‑made original component. In the automatic winding system, the click wheel typically works with the reversing wheel to form a one‑way transmission mechanism, ensuring that the bidirectional motion of the rotor is efficiently converted into unidirectional mainspring winding. As an original factory part, it is the ideal replacement for watchmakers to restore proper automatic winding function and resolve issues of reduced winding efficiency or unusual noises.
Genuine Audemars Piguet Part – Swiss factory‑original for the automatic modules of Caliber 3120 and 3126, not a copy.
Bi‑Directional Winding Core – Works with the reversing wheel for efficient bidirectional automatic winding regardless of wrist movement direction.
Precision Machined – Accurate click teeth and sliding surfaces for reliable one‑way locking and smooth power transfer.
Essential for Service – Replace when automatic winding efficiency drops, rotor feels rough, or unusual noises occur.
Compatible Movements – Designed for Audemars Piguet Caliber 3120 automatic and the 3126/3840 chronograph based on the same platform.
| Parameter（English） | Details |
|---|---|
| Part Name | Automatic Bearing Click Wheel |
| Compatible Movements | Audemars Piguet Caliber 3120, 3126/3840 automatic |
| Movement Diameter | 26.60 mm |
| Movement Thickness | 4.25 mm (3120) / 7.00 mm (3126/3840, with chronograph module) |
| Component Count | 280 parts (3120) / 365 parts (3126/3840) |
| Jewels | 40 (3120) / 59 (3126/3840) |
| Frequency | 21,600 vph (3 Hz) |
| Power Reserve | Approx. 60h (3120) / 50h (3126/3840) |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Audemars Piguet Caliber 3120 automatic movement (found in Royal Oak 15300, 15400, 15450; Jules Audemars, etc.).
Audemars Piguet Caliber 3126/3840 automatic chronograph movement (found in Royal Oak Offshore Chronograph models).
Repair of reduced automatic winding efficiency, rotor spinning without winding, or unusual noises during winding.
Replacement of worn or aged automatic click wheel components during full movement service.
1. Is this a genuine Audemars Piguet automatic click wheel?
Yes. It is a Swiss factory‑original part for the automatic module of Caliber 3120/3126, not a third‑party copy.
2. What are the symptoms of a damaged automatic click wheel?
Common symptoms include: the rotor spins normally but automatic winding is very poor (low power reserve after wearing), manual winding works but automatic does not, unusual noises or clicking sounds during automatic winding, and in rare cases a broken click wheel may completely prevent power transmission from the rotor.
3. What should I pay attention to during installation?
The click wheel is typically secured to the automatic bridge by a pivot and screw. Clean the train and inspect the mating reversing wheel before installation. Ensure proper engagement of the click tooth with the ratchet teeth, and tighten the fixing screw to the torque specified in the Audemars Piguet technical guide. Professional installation is strongly recommended.
4. Does the reversing wheel need to be replaced at the same time?
Not always. If the teeth of the reversing wheel are also visibly worn, it is recommended to replace both. Inspect the reversing wheel first; if wear is evident, replace it together with the click wheel to ensure optimal performance of the automatic winding system.
5. Does this part fit all 3120/3126 variants?
Yes. The Caliber 3120 and the chronograph Caliber 3126/3840 share the same automatic winding base module, so the click wheel is fully interchangeable across both calibers.
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