---
description: Genuine Omega 8500 winding pinion 7228500A31120 for Caliber 8500/8501. Swiss original keyless works part for movement repair.
title: Omega 8500 Movement Winding Pinion | Omega Movement Parts - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/06/8500A31120.jpg
---
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- **Omega 8500 Movement Winding Pinion 7228500A31120**
[](https://www.soflypart.com/wp-content/uploads/2019/06/8500A31120.jpg)
[](https://www.soflypart.com/wp-content/uploads/2019/06/8500A31120B.jpg)
# Omega 8500 Movement Winding Pinion 7228500A31120
$105.00
You Saved
| Brand | Choose an option Omega- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $105.00 |
| 3 - 4 | 5% | $99.75 |
| 5+ | 7% | $97.65 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $105.00 |
| 3 - 4 | 5% | $99.75 |
| 5+ | 7% | $97.65 |
Omega 8500 Movement Winding Pinion 7228500A31120 quantity
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## Product Description
The **Omega 8500 Movement Winding Pinion (7228500A31120)** is a genuine Swiss-made component designed for the **Omega Caliber 8500** Co‑Axial automatic movement . As a critical part of the keyless works mechanism, this winding pinion engages with the sliding pinion to enable manual winding of the movement . It is a recognized service part listed for Caliber 8500A, 8501A, 8500B, and 8501B versions in the official Omega technical documentation .
## Features & Function
- **Genuine Omega part** – authentic Swiss-made component for Caliber 8500/8501 series
- **Keyless works component** – engages with sliding pinion for manual winding
- **Manual winding function** – allows the user to wind the mainspring via the crown
- **Service replacement part** – recognized in official Omega technical documentation
- **Precision-engineered** – manufactured to Omega’s factory specifications
## Specifications
- **Part Number**: 7228500A31120
- **Compatible Movements**: Omega Caliber 8500A, 8500B, 8501A, 8501B
- **Movement Diameter**: 29.00 mm
- **Movement Height**: 5.5 mm
- **Jewels**: 39
- **Frequency**: 25,200 vph (3.5 Hz)
- **Power Reserve**: 60 hours (two series-coupled barrels)
- **Origin**: Switzerland (Omega factory part)
- **Condition**: Brand new
## Applications
- **Service and overhaul** of Omega Caliber 8500/8501 movements
- **Keyless works repair** – replacing worn or damaged winding pinions
- **Manual winding restoration** – restoring smooth crown operation
- **Restoration** of De Ville Hour Vision, Seamaster Aqua Terra, and other 8500‑powered models
- Suitable for **professional watchmakers** and **authorized service centers**
## FAQs
**1. Is this a genuine Omega part?**
Yes, this is a **genuine Omega factory part** (reference 7228500A31120), manufactured in Switzerland. It is listed in the official Omega spare parts list as “Winding pinion” for Caliber 8500/8501 series .
**2. Which movement versions is this winding pinion compatible with?**
This winding pinion is compatible with **Omega Caliber 8500A, 8500B, 8501A, and 8501B** versions . Please verify your movement version before ordering.
**3. What is the function of the winding pinion?**
The winding pinion is part of the **keyless works** that engages with the sliding pinion . When the crown is turned, the winding pinion transfers rotational force to the sliding pinion, enabling manual winding of the mainspring.
## Why Choose SOFLY Watch Parts?
- 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 **info@soflypart.com** or WhatsApp **+86 18620212114**.
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As a critical part of the keyless works mechanism, this winding pinion engages with the sliding pinion to enable manual winding of the movement\u00a0. It is a recognized service part listed for Caliber 8500A, 8501A, 8500B, and 8501B versions in the official Omega technical documentation\u00a0. Features & Function Genuine Omega part\u00a0\u2013 authentic Swiss-made component for Caliber 8500/8501 series Keyless works component\u00a0\u2013 engages with sliding pinion for manual winding Manual winding function\u00a0\u2013 allows the user to wind the mainspring via the crown Service replacement part\u00a0\u2013 recognized in official Omega technical documentation Precision-engineered\u00a0\u2013 manufactured to Omega's factory specifications Specifications Part Number: 7228500A31120 Compatible Movements: Omega Caliber 8500A, 8500B, 8501A, 8501B\u00a0 Movement Diameter: 29.00 mm Movement Height: 5.5 mm Jewels: 39 Frequency: 25,200 vph (3.5 Hz) Power Reserve: 60 hours (two series-coupled barrels) Origin: Switzerland (Omega factory part) Condition: Brand new Applications Service and overhaul\u00a0of Omega Caliber 8500/8501 movements Keyless works repair\u00a0\u2013 replacing worn or damaged winding pinions Manual winding restoration\u00a0\u2013 restoring smooth crown operation Restoration\u00a0of De Ville Hour Vision, Seamaster Aqua Terra, and other 8500\u2011powered models Suitable for\u00a0professional watchmakers\u00a0and\u00a0authorized service centers FAQs 1. Is this a genuine Omega part? Yes, this is a\u00a0genuine Omega factory part\u00a0(reference 7228500A31120), manufactured in Switzerland. It is listed in the official Omega spare parts list as \"Winding pinion\" for Caliber 8500/8501 series\u00a0. 2. Which movement versions is this winding pinion compatible with? This winding pinion is compatible with\u00a0Omega Caliber 8500A, 8500B, 8501A, and 8501B\u00a0versions\u00a0. Please verify your movement version before ordering. 3. What is the function of the winding pinion? The winding pinion is part of the\u00a0keyless works\u00a0that engages with the sliding pinion\u00a0. When the crown is turned, the winding pinion transfers rotational force to the sliding pinion, enabling manual winding of the mainspring. Why Choose SOFLY Watch Parts? 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. 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Features & Function Genuine Omega part\u00a0\u2013 authentic Swiss-made component for Caliber 8500/8501 series Keyless works component\u00a0\u2013 engages with sliding pinion for manual winding Manual winding function\u00a0\u2013 allows the user to wind the mainspring via the crown Service replacement part\u00a0\u2013 recognized in official Omega technical documentation Precision-engineered\u00a0\u2013 manufactured to Omega's factory specifications Specifications Part Number: 7228500A31120 Compatible Movements: Omega Caliber 8500A, 8500B, 8501A, 8501B\u00a0 Movement Diameter: 29.00 mm Movement Height: 5.5 mm Jewels: 39 Frequency: 25,200 vph (3.5 Hz) Power Reserve: 60 hours (two series-coupled barrels) Origin: Switzerland (Omega factory part) Condition: Brand new Applications Service and overhaul\u00a0of Omega Caliber 8500/8501 movements Keyless works repair\u00a0\u2013 replacing worn or damaged winding pinions Manual winding restoration\u00a0\u2013 restoring smooth crown operation Restoration\u00a0of De Ville Hour Vision, Seamaster Aqua Terra, and other 8500\u2011powered models Suitable for\u00a0professional watchmakers\u00a0and\u00a0authorized service centers FAQs 1. Is this a genuine Omega part? Yes, this is a\u00a0genuine Omega factory part\u00a0(reference 7228500A31120), manufactured in Switzerland. It is listed in the official Omega spare parts list as \"Winding pinion\" for Caliber 8500/8501 series\u00a0. 2. Which movement versions is this winding pinion compatible with? This winding pinion is compatible with\u00a0Omega Caliber 8500A, 8500B, 8501A, and 8501B\u00a0versions\u00a0. Please verify your movement version before ordering. 3. What is the function of the winding pinion? The winding pinion is part of the\u00a0keyless works\u00a0that engages with the sliding pinion\u00a0. When the crown is turned, the winding pinion transfers rotational force to the sliding pinion, enabling manual winding of the mainspring. Why Choose SOFLY Watch Parts? 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. 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