Bonded Seal Dowty Washers

Short Description:

It is used in hydraulic cylinders and other hydraulic or pneumatic application.

Product Detail

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In mechanical engineering, a bonded seal is a type of washer used to provide a seal around a screw or bolt. Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers. Now widely manufactured, they are available in a range of standard sizes and materials. A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an elastomeric material that acts as a gasket. It is the compression of the elastomeric part between the faces of the parts on either side of the bonded seal that provides the sealing action. The elastomeric material, typically nitrile rubber, is bonded by heat and pressure to the outer ring, which holds it in place. This structure increases resistance to bursting, increasing the pressure rating of the seal. Because the bonded seal itself acts to retain the gasket material, there is no need for the parts to be sealed to be shaped to retain the gasket. This results in simplified machining and greater ease of use as compared to some other seals, such as O-rings. Some designs come with an additional flap of rubber on the internal diameter to locate the bonded seal at the centre of the hole; these are called self-centring bonded washers.


Material: NBR 70 Shore A + stainless steel with anti corrosion treatment

Technical Data

Temperature:-30℃ to +200℃
Static motion
Media: mineral based oil, hydraulic fluid
Pressure: about 40MPa


- Reliable low and high pressure sealing
- High and low temperature capabilities
- Bolt torque is reduced with no loss of tightening load

Washer component is carbon steel, zinc/yellow zinc plated or stainless steel (on request). For more information or to request a quote on bonded seals, please contact us directly.

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