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 No. 168, Xinxing Industrial Area of Ren County, Tiankou Town, Xingtai, Hebei Province 05154



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Rubber Metal Bonded Seal Washers

Bonded Seals
Bonded seals are metal washers with a rubber insert bonded to the inside diameter for use in high pressure applications
  • All size

  • GTI

  • Xingtai city,Hebei province, CHINA.

  • can customize

  • GTI

  • FREE

  • Manufacturer

The Bonded Seal was originally designed to replace copper type washers in high-pressure systems. Often used as bolt seals in hydraulic equipment, today bonded seals (commonly known as Dowty Seals) are finding usage in many and varied applications throughout various industries.

The Bonded Seal comprises a metal washer and an elastomeric ring bonded inside the diameter. The metal washer prevents over-compression and limits deformation of the elastomeric ring.

All size ranges and material combinations are available. This same basic concept can be used to produce customized shapes for specific applications in any of the combinations of rubber to metal or plastic bonding.

Bonded Seals are available with or without the self-centralizing lip

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.


Product NameSelf-centring Bonded Dowty Seal  Flattening Washer
CategoryHydraulic seals, Pneumatic seals, customize seals


Bonded seal


Stainless Steel,Nitrile Rubber

High temperature, low temperature, high pressure, low pressure,

friction resistance

SizesStandard and customize
Temperature-45℃    +200℃
MiedumHydraulic oil,  anti-fire fluid, water, gas etc

excavators, loaders, graders, dump trucks, forklifts, bulldozers, scrapers, mining trucks,

cranes, aerial vehicles, garbage transfer vehicle, sliding cars, agricultural machinery,

logging equipment, aircraft, motor,electronics industries,etc.




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