Bonded Washers – Self-Centering Oil & Hydraulic Sealing Washers

Our bonded sealing washers – often called Dowty-type washers – feature a metal outer ring with a moulded nitrile rubber (NBR) insert. These create a pressure-tight seal between bolt heads and mating surfaces, and are widely used in hydraulic, oil, and fuel systems.

Note: While these are commonly referred to as Dowty-type, they are not branded Dowty® products.

🛠️ Washer Type: Mild Steel with Nitrile (NBR)

• Metal: Mild steel
• Insert: Nitrile rubber (NBR)
• Type: Self-centering (bonded seal type)
• Finish: Zinc-plated or black depending on stock

📏 Sizes Available

• Metric sizes (e.g. M6, M8, M10, M12, etc.)
• Imperial sizes (e.g. 1/4”, 3/8”, 1/2”, etc.)

Each listing includes inner diameter (ID), outer diameter (OD), and thickness to help you find the right fit.

✅ Typical Applications

• Hydraulic fittings & banjo bolts
• Gearbox and engine sump plugs
• Brake and clutch master cylinders
• Diesel injector connections
• Air compressor systems

🧪 Do You Offer Other Material Options?

We currently stock the most common configuration: mild steel with NBR insert. If you require any of the following:

• Stainless steel outer ring (corrosion-resistant)
• FKM / Viton® inner rubber (fuel or chemical resistance)

Contact us – we may have them in stock or can source them for you.

🧡 Why Buy Bonded Washers from SealWithSelo?

• No minimum quantity – order one or a hundred
• Wide range of metric and imperial sizes
• Self-centering style for easy installation
• Next-day UK dispatch available
• Friendly, knowledgeable support