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This is a high-quality generic mainspring specifically designed for Rolex‘s 32XX series calibers, models 3230 and 3235. Introduced in 2015, Caliber 3235 represents Rolex’s next-generation main production automatic movement, with over 90% of its components redesigned compared to the previous 3135. Caliber 3230 is the no-date variant of the same platform, sharing an identical mainspring system.
A major technical breakthrough of the 32 series is the redesigned mainspring barrel — thinner barrel walls (50% thinner than its predecessor) allow for a longer mainspring, which, combined with the new Chronergy escapement, boosts the power reserve from approximately 50 hours in the 3135 to a full 70 hours.
Generic Replacement – Designed for Rolex 3230/3235 movements; non‑original but matches OEM dimensions and torque.
70‑Hour Power Reserve – Works with thin‑wall barrel and Chronergy escapement to deliver 70 hours of reserve.
High‑Quality Alloy – Made of premium spring steel for stable torque output and fatigue resistance.
Cost‑Effective – Affordable alternative to genuine mainsprings for service or replacement.
Direct Fit – Same installation as the original; no modification to the barrel required.
| Parameter | Details |
|---|---|
| Part Name | Mainspring |
| Compatible Movements | Rolex Caliber 3230, 3235 (also other 32XX calibers like 3285) |
| Type | Generic aftermarket |
| Power Reserve | Approx. 70 hours |
| Material | Spring steel (high‑elasticity alloy) |
Rolex Caliber 3230 (no‑date models: Oyster Perpetual, Submariner no‑date)
Rolex Caliber 3235 (date models: Datejust 41, Submariner Date, Sea‑Dweller)
Rolex Caliber 3285 (GMT‑Master II – shares the same mainspring)
Replacement of aged, broken, or low‑torque mainsprings during full movement service
Repair of insufficient power reserve or slow timing caused by mainspring fatigue
1. Is this a genuine Rolex mainspring?
No. It is a generic aftermarket replacement, not original, but matches the 32XX movement dimensions and torque.
2. Can this mainspring be used in a 3135 movement?
No. The 32XX mainspring is longer and thinner, with a different barrel design – not interchangeable with 3135.
3. What should I pay attention to during installation?
Use a mainspring winder to avoid distortion. Ensure the outer end engages the barrel wall notch and the inner end locks onto the arbor. Professional installation is strongly recommended.
4. When should the mainspring be replaced?
If the power reserve drops significantly below 70 hours after full winding, or if the amplitude is very low after servicing other components, replace the mainspring.
5. Does this mainspring fit Caliber 3285 (GMT)?
Yes. Caliber 3285 shares the same barrel and mainspring system as 3235 – fully compatible.
Fast worldwide shipping within 3 business days.
Competitive pricing on Seiko/Hattori calibers.
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