Product Description

SHIMANO 1009E O RING (RD19831)

Maintain Your Reel’s Water Resistance

The Shimano 1009E O Ring (RD19831) is a critical seal component found in the oscillation system of modern Shimano spinning reels. Located at the rear of the reel body—typically installed on the worm shaft bushing or retainer—this O-ring acts as a primary barrier against water and contaminant intrusion.

Part of Shimano's X-Protect and Core Protect systems, this specialized rubber seal ensures that the delicate internal worm shaft gears remain clean and lubricated. A cracked, dried, or missing O-ring can compromise your reel's water resistance, leading to internal corrosion and gear failure. Replace this seal during your regular maintenance to ensure your reel survives the elements.

Product Specifications

• Part Name: O Ring (Worm Shaft / Rear Protector Seal)

• Manufacturer: Shimano

• Part Number (MPN): RD19831

• Schematic Location Code: 1009E

• Material: High-grade Nitrile Rubber (NBR)

• Function: Water sealing and vibration dampening for the worm shaft assembly

Compatible Models

This part is standard on many "Core Solid" and "Magnumlite" series reels (2019 and newer) that feature the rear worm shaft oscillation design.

• Shimano Stradic FL Series:

  • ST 1000HG FL, ST 2500HG FL, ST C3000XG FL, ST 4000XG FL, ST C5000XG FL

• Shimano Vanford F Series:

  • VF 2000SHG F, VF 2500HG F, VF C3000HG F, VF 4000XG F

• Shimano Twin Power Series:

  • 20 Twin Power FD (All Sizes)

  • 21 Twin Power XD (C3000 - C5000)

• Shimano Ultegra FC:

  • ULT 2500 FC, ULT C3000 FC, ULT 4000 FC

• Shimano Sustain FJ:

  • SA 2500HG FJ, SA C3000XG FJ

Installation & Reference

To ensure this is the correct seal for your specific model, please cross-reference part number RD19831 or schematic key 1009E with your reel's diagram.

• Schematic Diagrams: For detailed PDF schematics and part location verification, please visit www.reelschematic.com.

• Alternate Part Number: RD19831

Installation Tip: Apply a light coating of silicone grease to the O-ring before installation. This helps the seal seat correctly without pinching and improves its water-repelling properties.