---
description: Genuine Omega 8500 sliding pinion 7228500A31121 for Caliber 8500/8501. Swiss original keyless works part for movement repair.
title: Omega 8500 Movement Sliding Pinion | Omega Movement Parts - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/06/8500A31121.jpg
---
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- **Omega 8500 Movement Sliding Pinion 7228500A31121**
[](https://www.soflypart.com/wp-content/uploads/2019/06/8500A31121.jpg)
[](https://www.soflypart.com/wp-content/uploads/2019/06/8500A31121B.jpg)
# Omega 8500 Movement Sliding Pinion 7228500A31121
$90.00
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| Brand | Choose an option Omega- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $90.00 |
| 3 - 4 | 5% | $85.50 |
| 5+ | 7% | $83.70 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $90.00 |
| 3 - 4 | 5% | $85.50 |
| 5+ | 7% | $83.70 |
Omega 8500 Movement Sliding Pinion 7228500A31121 quantity
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## Product Description
The **Omega 8500 Movement Sliding Pinion (7228500A31121)** is a genuine Swiss-made component for the **Omega Caliber 8500** Co‑Axial automatic movement . As a critical part of the **keyless works mechanism**, this sliding pinion is mounted on the winding stem and moves axially to enable switching between manual winding, date correction, and time‑setting modes . 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 series
- **Keyless works component** – enables mode switching for crown operation
- **Axial movement** – slides along the winding stem for position engagement
- **Service replacement part** – recognized in official Omega technical documentation
- **Precision-engineered** – manufactured to Omega’s factory specifications
## Specifications
- **Part Number**: 7228500A31121
- **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 sliding pinions
- **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 7228500A31121), manufactured in Switzerland. It is listed in the official Omega 8500 spare parts list under “Sliding pinion” .
**2. Which movement versions is this sliding pinion compatible with?**
This sliding 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 sliding pinion?**
The sliding pinion is mounted on the winding stem and moves axially within the keyless works mechanism . It engages with different components to enable manual winding, date correction, and time‑setting functions depending on the crown position.
## 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\u00a0keyless works mechanism, this sliding pinion is mounted on the winding stem and moves axially to enable switching between manual winding, date correction, and time\u2011setting modes\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 series Keyless works component\u00a0\u2013 enables mode switching for crown operation Axial movement\u00a0\u2013 slides along the winding stem for position engagement Service replacement part\u00a0\u2013 recognized in official Omega technical documentation Precision-engineered\u00a0\u2013 manufactured to Omega's factory specifications Specifications Part Number: 7228500A31121 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 sliding pinions Restoration\u00a0of De Ville Hour Vision, Seamaster Aqua Terra, and other 8500\u2011powered models Suitable for\u00a0professional watchmakers\u00a0and\u00a0authorized service centers FAQs 1. 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Features & Function Genuine Omega part\u00a0\u2013 authentic Swiss-made component for Caliber 8500 series Keyless works component\u00a0\u2013 enables mode switching for crown operation Axial movement\u00a0\u2013 slides along the winding stem for position engagement Service replacement part\u00a0\u2013 recognized in official Omega technical documentation Precision-engineered\u00a0\u2013 manufactured to Omega's factory specifications Specifications Part Number: 7228500A31121 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 sliding pinions Restoration\u00a0of De Ville Hour Vision, Seamaster Aqua Terra, and other 8500\u2011powered models Suitable for\u00a0professional watchmakers\u00a0and\u00a0authorized service centers FAQs 1. 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