$42.00
You Saved
The Rolex Calibre 3135-635 Cam Yoke Spring (Ref. No. 3135-635, also designated as B3135-635-Y1) is a genuine OEM component manufactured in Switzerland for the Rolex Calibre 3135 automatic movement and its derivative calibers 3175 and 3185. As a critical element of the instantaneous date-changing mechanism, this precision-engineered spring applies constant preload pressure against the cam yoke (No. 3135-633) to drive the instantaneous date change at midnight. With a thickness of precisely 0.21 mm — thinner than its counterpart for Calibre 3155 (0.28 mm) — this robust spring is carefully distinguished by a bend at one extremity.
This exact-match drop-in replacement part is essential for professional watchmakers restoring worn, lost, or damaged original components to factory operational standards.
Genuine OEM manufacturing – Authentic Rolex part crafted in Switzerland to original factory tolerances, ensuring perfect fit, function, and long-term reliability
Instantaneous date‑change driving – Applies precise spring force against the cam yoke and cam mechanism to power the instantaneous date flip at midnight, delivering the signature crisp date transition of Rolex Calibre 3135
Extensive caliber compatibility – Designed for Calibre 3135, Calibre 3175, and Calibre 3185; cross‑compatibility across multiple Rolex 31xx‑series automatic movements
Precision thickness specification – Manufactured to 0.21 mm thickness (distinct from Calibre 3155’s 0.28 mm spring), with a specific bend at one extremity for positive visual identification
Drop‑in replacement fit – Engineered as an exact-match substitution for worn, broken, or lost original components without modification
OE‑grade durability – Manufactured to Rolex’s rigorous quality control standards, delivering consistent mechanical performance over extended service intervals
| Parameter | Value |
|---|---|
| Part Number / Ref. | 3135-635 / B3135-635-Y1 |
| Manufacturer | Rolex (Genuine OEM) |
| Country of Manufacture | Switzerland |
| Component Type | Cam Yoke Spring (also: Spring for Cam Yoke) |
| Thickness | 0.21 mm |
| Material | High-grade steel |
| Distinguishing Feature | Bend at one extremity for identification |
| Compatible Calibers | Rolex Calibre 3135, Calibre 3175, Calibre 3185 |
| Associated Components | Cam yoke (No. 3135-633), jewel for yoke for cam (No. 3135-9633), date wheel mounted (No. 3185-625), finger for date (No. 3185-623) |
| OEM Part Category | Instantaneous date mechanism / date indicator system |
| Unit Quantity | 1 piece per order |
Replacement of worn, broken, or lost cam yoke springs during professional service of Rolex Calibre 3135 watches, including iconic Datejust models (Refs. 16200, 16220, 16233, 16234) and Sea‑Dweller references
Servicing and restoration of movements where the instantaneous date mechanism fails to flip cleanly or where the spring has lost tension or been damaged
Watch repair workshops and authorized service centers performing movement overhauls that involve disassembly of the date indicator mechanism
Professional restoration projects seeking exact-match OEM parts to preserve original mechanical functionality and factory specifications
Q1: Is this cam yoke spring an authentic genuine Rolex part or a generic aftermarket replica?
This is a 100% genuine Rolex OEM part, manufactured in Switzerland to original factory specifications. It is not a generic or aftermarket product. Each unit is produced under Rolex‘s strict quality control and is identical to the component originally fitted in Calibre 3135, 3175, and 3185 movements.
Q2: Which Rolex watch models and calibers is this part compatible with?
This cam yoke spring is designed for Rolex Calibre 3135 (found in Datejust, Sea‑Dweller, Yacht‑Master, and Submariner Date references from the 1988–2019 production era), as well as Calibre 3175 and Calibre 3185 (GMT‑Master II variants). It is not interchangeable with Calibre 3155, which uses a thicker spring (No. 3155-635) at 0.28 mm.
Q3: What is the quality and reliability of this genuine Rolex part?
As a genuine Rolex OEM component manufactured in Switzerland, it fully meets the brand‘s rigorous factory quality standards. Professional watchmakers have noted that this spring is exceptionally powerful and robust, and Rolex’s implementation—with a jewel on the cam yoke and this powerful spring—is designed to deliver a service life far exceeding that of equivalent components in other movements.
Fast worldwide shipping within 3 business days.
Competitive pricing on Seiko/Hattori calibers.
3,000+ watch movements and parts in stock.
Trusted by watchmakers worldwide.
Personalized sourcing support via [email protected] or WhatsApp +86 18620212114.
