Delivering Fluid Sealing Solutions Since 1972

Bonded Seals

The UK’s specialist in Bonded Seals, Bonded Washers and Sealing Washers

Vast stocks and the shortest lead times in the industry makes M Barnwell Services the trusted supplier of Bonded Seals / Sealing Washers to thousands of engineers.

Commonly known as Dowty Seals, M Barnwell Services Bonded Seals and Washers are reliable and dependable in high pressure applications. Particularly suitable for sealing under the heads of bolts and threaded components, for Pipe Couplings and a wide range of connector applications where a perfect face-to-face contact is required for sealing gases, oils, and other fluids.

Our Bonded Seals (or Dowty Seals) consist of a rubber sealing element that is bonded to the inner wall of a metal washer. They are used in applications where high pressures demand greater sealing capacity that can be obtained with Copper or traditional washers.

Our Mild Steel / Stainless Steel range offers the highest burst pressure resistance offering tensile strength up to 540 MN/m2 (35 tons f/in2 UTS) minimum. For materials see our material properties page.

For specialist gas and medical applications we recommend using our range of BODOK Seals. These seals help to ensure an air-tight seal between the cylinder yoker or regulator of any medical device.

Sealing Washer Bonded Seals Dowty Seal  Bonded Washer

If you would like more information about our range, download our catalogue or contact a member of the team.

We also stock a vast range of Sealing Washers including Flat, Spring, Tooth and Serrated, Tab, Tapered, and Construction. For more information about this range click here.


Standard size range: BSP, BSF, BSPF (CETOP), and Metric


Rubber - Nitrile (NBR), Viton® (FKM/FPM), Hydrogenated Nitrile (HNBR), & Ethylene propylene (EPDM), Fluorosilicone (FVMQ).

Metal - Mild Steel, Stainless Steel, Carbon, Copper, Brass, Aluminium Alloy, Aluminium Bronze

Plating - Zinc, Clear Passivate, Gold Passivate, Chromic Anodise, Sulphuric Anodise, Iron and Black Chromate, Sherardize 2000


Standard and Self-Centralising, Lockseals Range, Bodok


British Imperial, ISO R261 BS3643, BS3643, AGS1186, CETOP (ISO 1179/1973), DEF. STAN

Associated Products

Barloc Rubber Covered Lock Washer, Barlon Nylon Captive Washer, Metal Washers, Fibre Washers, Rubber Washers