---
description: Rolex 3135-635 cam yoke spring, Swiss OEM for Calibre 3135 / 3175 / 3185, 0.21mm, drives instant date change at midnight, drop-in replacement.
title: Rolex Calibre 3135-635 Cam Yoke Spring - Sofly
image: https://www.soflypart.com/wp-content/uploads/2024/04/Rolex-3135-635-cam-yoke-spring.jpg
---
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- **Rolex Calibre 3135-635 Cam Yoke Spring**
[](https://www.soflypart.com/wp-content/uploads/2024/04/Rolex-3135-635-cam-yoke-spring.jpg)
# Rolex Calibre 3135-635 Cam Yoke Spring
$42.00
You Saved
| Brand | Choose an option ROLEX- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $42.00 |
| 3 - 4 | 5% | $39.90 |
| 5+ | 7% | $39.06 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $42.00 |
| 3 - 4 | 5% | $39.90 |
| 5+ | 7% | $39.06 |
Rolex Calibre 3135-635 Cam Yoke Spring quantity
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## Product Description
This is a **genuine OEM cam yoke spring**, Ref. **3135-635** (also **B3135-635-Y1**), made in Switzerland for the **Calibre 3135** and derivatives **3175, 3185**. A critical element of the **instantaneous date-change mechanism**, it applies constant preload to the **cam yoke (3135-633)** to drive the **instant date change at midnight**. Thickness precisely **0.21mm** (vs. 0.28mm for 3155), distinguished by a **bend at one extremity**.
## Specifications
- **Model:** Rolex 3135-635 (B3135-635-Y1)
- **Type:** **Cam Yoke Spring**
- **Compatible with:** **Calibre 3135 / 3175 / 3185**
- **Thickness:** **0.21 mm**
- **Function:** **Preloads cam yoke, drives instant date change at midnight**
- **Features:** **OEM, exact-match, drop-in replacement**
- **Origin:** **Made in Swiss**
## FAQ
**1. Is it genuine?**
This is an **aftermarket part**, not in original packaging, but dimensions and specifications **exactly match** the original.
**2. How is the quality?**
**Precision-machined spring**, ensuring accurate and reliable instant date change.
**3. What is it suitable for?**
Ideal for **calendar mechanism repair and replacement** in **Calibre 3135 / 3175 / 3185**.
## Why Choose SOFLY Watch Parts?
**Fast Worldwide Shipping** – Orders are dispatched within 3 business days.
**Competitive Pricing** – Great value across watch movements, replacement parts and watchmaking tools.
**Extensive Selection** – More than 3,000 watch movements, parts and accessories available.
**Trusted Worldwide** – Trusted by watchmakers, repair professionals and watch enthusiasts worldwide.
**Personalized Sourcing** – Can’t find the part you need? Contact **info@soflypart.com** or WhatsApp **+86 18620212114.**
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A critical element of the instantaneous date-change mechanism, it applies constant preload to the cam yoke (3135-633) to drive the instant date change at midnight. Thickness precisely 0.21mm (vs. 0.28mm for 3155), distinguished by a bend at one extremity. Specifications Model: Rolex 3135-635 (B3135-635-Y1) Type: Cam Yoke Spring Compatible with: Calibre 3135 / 3175 / 3185 Thickness: 0.21 mm Function: Preloads cam yoke, drives instant date change at midnight Features: OEM, exact-match, drop-in replacement Origin: Made in Swiss FAQ 1. Is it genuine? This is an aftermarket part, not in original packaging, but dimensions and specifications exactly match the original. 2. How is the quality? Precision-machined spring, ensuring accurate and reliable instant date change. 3. What is it suitable for? Ideal for calendar mechanism repair and replacement in Calibre 3135 / 3175 / 3185. Why Choose SOFLY Watch Parts? Fast Worldwide Shipping\u00a0\u2013 Orders are dispatched within 3 business days. 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