Buna-N Back-Up Ring

Buna-N Back-Up Ring

This Buna-N Back-Up Ring is a nitrile (Buna-N) support component designed to work in conjunction with the equivalent-number O-ring from the same size series. Installed on the low-pressure side of the O-ring, it helps reduce extrusion and maintain sealing integrity when pressure starts pushing seals beyond their comfort zone.

Country of Origin
Varies by production batch

Key Features / Specifications

• Product Type: Back-up ring
• Material: Buna-N (nitrile)
• Compatibility Note: Use with the equivalent-number O-ring (matching size series)
• Function: Supports the O-ring and helps prevent extrusion under pressure
• Use: Installed alongside an O-ring in a compatible groove

Ideal For

• Hydraulic and pneumatic systems where higher pressure can distort standard O-rings
• Applications requiring added sealing support without changing groove dimensions
• Maintenance or rebuilds using matching-size O-rings and back-up rings
• Anyone who wants their O-rings to seal confidently instead of sneaking out of place