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This is a high‑quality generic bezel screw for the Audemars Piguet Royal Oak reference 16400, measuring 12.7mm (overall length) × 1.6mm (thread diameter), available in two head diameter options: 2.6mm and 3.9mm. Crafted from precision‑polished stainless steel, this screw secures the iconic octagonal bezel to the case middle, restoring the watch‘s original aesthetic and structural integrity.
Material & Finish: High‑quality stainless steel (316L), finely polished – corrosion‑resistant, wear‑resistant, and visually consistent with the original.
Dimensions: Overall length 12.7mm, thread diameter 1.6mm (metric fine thread). Two head diameter options: 2.6mm and 3.9mm to suit different production batches of the Royal Oak 16400.
Function: Secures the octagonal bezel to the case middle. The Royal Oak bezel is typically fastened by eight evenly spaced screws, ensuring a tight fit and water resistance.
Precision Fit: Specifically engineered for the 16400, guaranteeing the screw head sits flush with the bezel surface.
| Specification | Details |
|---|---|
| Compatible Model | Audemars Piguet Royal Oak 16400 and other similar references |
| Case Diameter | Approx. 39‑41 mm (varies by version) |
| Overall Length | 12.7 mm |
| Thread Diameter | 1.6 mm |
| Thread Pitch | Metric fine (approx. 0.35mm, fits AP original threads) |
| Head Diameter Options | 2.6 mm / 3.9 mm (choose according to original screw) |
| Head Type | Straight slot |
| Recommended Screwdriver | Flathead, blade width exactly matching slot |
| Material | Stainless steel (316L) |
| Finish | Polished |
| Quantity | Single or multiple (bezel usually requires 8 screws) |
Q1: How to choose between the 2.6mm and 3.9mm head diameters?
A: Measure the head diameter of your original screw. If it is approx. 2.6mm, select the 2.6mm version; if approx. 3.9mm, select the 3.9mm version. The wrong size will cause the screw head to protrude or sit too deep.
Q2: Can I install the screws without threadlocker?
A: Not recommended. Bezel screws are subject to vibration during wear. Without threadlocker, they will gradually loosen, creating a gap that compromises water resistance. Low‑strength threadlocker prevents loosening while remaining removable.
Q3: The screw head slot is stripped. How can I remove it?
A: Try placing a rubber band over the screwdriver tip for extra grip. If still stuck, a micro‑drill or screw extractor may be needed (high risk). Professional removal is recommended.
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