Omega 8500 Movement Sliding Pinion 7228500A31121

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.

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