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This is a high-quality generic mainspring kit for the Jaeger-LeCoultre Caliber 925 automatic movement, including a mainspring, steel pallet fork, and escape wheel. Designed to repair or replace worn movement components, it effectively restores power reserve and timekeeping accuracy. Please note that this kit is NOT compatible with the silicon escapement version of the Caliber 925 movement.
Complete Kit – Includes mainspring, steel pallet fork, and escape wheel – a one‑stop solution for common Caliber 925 movement failures.
High‑Quality Steel Escapement – Pallet fork and escape wheel are made of hardened stainless steel for wear resistance and efficient power transfer.
Standard Mainspring – Delivers stable torque, matching the approximately 40‑hour power reserve of the Caliber 925.
Not Compatible with Silicon Version – Designed for traditional metal‑escapement 925 movements; does NOT fit silicon‑escapement variants (e.g., Caliber 925/2).
Cost‑Effective Repair – Offers a more affordable alternative to genuine factory parts.
| Parameter | Details |
|---|---|
| Compatible Movement | Jaeger‑LeCoultre Caliber 925 (traditional metal escapement version) |
| Kit Contents | Mainspring ×1, steel pallet fork ×1, steel escape wheel ×1 |
| Mainspring Width | Approx. 1.10 mm |
| Mainspring Thickness | Approx. 0.11 mm |
| Mainspring Length | Approx. 280 mm |
| Power Reserve | Approx. 40 hours (same as original) |
| Escape Wheel Material | Hardened stainless steel |
| Pallet Fork Material | Hardened stainless steel |
| NOT Compatible With | Caliber 925 silicon escapement version (e.g., Caliber 925/2) |
| Origin | Manufactured to OEM specifications (non‑original) |
| Condition | Brand new |
Repairing Jaeger‑LeCoultre Caliber 925 movements suffering from low power reserve or stoppage caused by a tired or broken mainspring.
Replacing worn or damaged steel pallet forks and escape wheels to restore escapement precision.
Suitable for Caliber 925 watches with the traditional metal escapement (e.g., certain Reverso models).
NOT suitable for silicon‑escapement variants such as Caliber 925/2.
1. Is this a genuine Jaeger‑LeCoultre part?
No. This is a high‑quality generic replacement kit, not a factory original, but its dimensions and specifications are manufactured to Caliber 925 standards for direct replacement of worn original components.
2. How can I confirm whether my movement is the metal escapement version (not silicon)?
Check the pallet fork: traditional steel is silver‑white with metallic luster; silicon forks are usually dark grey or black with a smooth, non‑metallic appearance. Also, the silicon version (Caliber 925/2) was introduced around 2015. Consult a watchmaker if unsure.
3. Does the mainspring in this kit require lubrication?
Yes. Apply a small amount of dedicated mainspring grease (e.g., Moebius 8200) to the barrel wall and oil the arbor before installing the mainspring. The pallet fork and escape wheel also require proper lubrication with dedicated escapement oil. Refer to the JLC Caliber 925 technical guide.
4. What special precautions should I take during installation?
Handle the pallet fork and escape wheel with extreme care, ensuring both pivots drop into their jewels. Use anti‑static plastic tweezers to avoid scratching the working surfaces. Professional installation by an experienced watchmaker is strongly recommended, as the Caliber 925 escapement is very sensitive to clearance and lubrication.
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