Aerospace & Defence

Fluid sealing products for the Aerospace and Defence industry

M. Barnwell Services supplies critical seals for use in both Aerospace and Defence. All products meet the standards required for these industries.

We are continuously researching, designing, enhancing and distributing a diverse range of parts that are critical to the NATO (stock numbers NSN), NES 337 (Naval Standard) UK Ministry of Defence (MOD), AS9100 Rev.C and DEF STAN specifications. Bespoke O-Rings and special mouldings can be produced to meet the specific requirements of your application.

Aerospace and Defence materials

Bonded seals (also known as Dowty seals) or washers, are used in the Aerospace & Defence Industry to create a reliable, leak-proof seal between two surfaces, typically in hydraulic or pneumatic systems. They are designed to prevent fluid or gas leakage in high-pressure environments which is critical in this industry, where safety and performance are principle.

Bonded seals/Sealing washers are used to seal joints in hydraulic systems that operate under high pressure, ensuring there are no fluid leaks, as well as preventing leaks in fuel lines and connections. The pressure they are able to withstand is dependant on the size and material chosen. Temperatures range from -30°C to 100°C for NBR Rubber seals and -15°C to +200°C in the case of FKM seals.

Further information

NATO Stock Numbers List – Oil Seals
NATO Stock Numbers List – O Rings

Sealing Washers – British Imperial Standard range
Sealing Washers – German Metric Standard range
Sealing washers – French Metric range

Popular products supplied include:

Packaging, industry standard and bespoke solutions are offered.

When it comes to quality fluid sealing products we are one of the most reliable sources in the industry.

We can also provide onsite consultation, sample identification and technical support for your requirements.