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The Bergeon 5679 is a professional round head chuck featuring a nickel-plated brass handle and two interchangeable chucks with opening ranges of 0–1.5mm and 1.9–3mm. With an overall length of 115mm, it is ideal for precisely gripping cylindrical parts such as crown stems and gear pivots in watchmaking, providing stable and concentric holding force.
Genuine Bergeon Tool – Swiss brand renowned for quality in watchmaking.
Dual Chuck Set – Two interchangeable chucks covering 0–1.5mm and 1.9–3mm for versatile gripping.
Nickel-plated Brass Handle – Corrosion-resistant, comfortable grip, and easy to turn.
Round Head Design – Allows quick tightening/releasing, ideal for frequent part changes.
Precision Concentricity – Ensures accurate alignment of the workpiece, minimizing runout.
| Parameter | Details |
|---|---|
| Model | Bergeon 5679 |
| Type | Round head chuck |
| Handle Material | Nickel-plated brass |
| Number of Chucks | 2 (interchangeable) |
| Opening Ranges | 0 – 1.5 mm / 1.9 – 3 mm |
| Overall Length | 115 mm |
1. Is this a genuine Bergeon tool?
Yes. Bergeon is a Swiss professional watchmaking tool brand, and this is an authentic Bergeon 5679. Check the branding on the tool or packaging for confirmation.
2. How do I change the two chucks?
The chucks are typically threaded or press‑fitted. Refer to Bergeon instructions: loosen the chuck, remove the current one, insert the other, and tighten. Handle gently to avoid thread damage.
3. What operations is this chuck used for?
It is mainly used in watch repair to grip small cylindrical parts such as crown stems, gear pivots, and barrel arbors for filing, cutting, or polishing. Also suitable for model making or precision mechanics.
4. Why is there a gap between 1.5mm and 1.9mm?
The small chuck covers 0–1.5mm and the large chuck covers 1.9–3mm. Parts between 1.5–1.9mm require a different chuck (e.g., other Bergeon models). However, most watch stems (0.9mm, 1.2mm, 2.0mm, etc.) are covered.
5. How should I maintain the chuck?
Clean chucks and handle after use to remove oil and dust. Apply a light rust preventive oil if storing for long periods. Do not exceed the maximum recommended diameter to avoid deforming the chuck.
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