Delivering Fluid Sealing Solutions Since 1972

Back-up Rings (Anti-Extrusion Rings)

Back-up Rings UK: Pressure support for O-Rings and X-Rings / Quad-Rings

M Barnwell Services Back-up Rings (also known as Anti-Extrusion Rings) are used to support O Rings and X-Rings / Quad-Rings in both static and dynamic applications to overcome the extrusion of the seal when the system pressure is too great for an unsupported seal. Back-up Rings are usually required on system pressures above 105 BAR (1500 PSI) or where extrusion gaps are excessive.

We stock a vast range of  Anti-Extrusion Rings to suit Imperial and Metric sized O Rings. These include Spiral, Split and Solid types.

Materials available are: PTFE, Nitrile (NBR), Viton® (FKM/FPM), Polyurethane (AU), Leather, Hytrel®, Rubberised-Fabric and other materials available upon request.


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


Manufactured as standard to suit O-Ring sizes but can be manufactured to almost any size


Solid, Contoured, Spiral, Single Turn and Split


PTFE, Nitrile (NBR), Viton® (FKM/FPM), Polyurethane (AU), Leather, Hytrel®, Rubberised-Fabric & many more


Bespoke to customer requirements

Associated Products

O-Rings, X-Rings / Quad Rings