Generic Buna-N O-Ring [5-1/4" ID] [1/8" CS] (O-139)

A Buna-N O-ring helps create a seal at a compatible circular connection, and this generic version is sized with a 5-1/4 inch inside diameter and 1/8 inch cross-section using the O-139 reference. When an O-ring in this size becomes flattened, cut, or brittle, the assembly can lose the sealing support it should maintain.

The 1/8 inch cross-section gives this O-ring practical value because it provides a balanced sealing profile for larger applications that do not require a thin specialty section or a heavier-duty seal. A properly selected O-ring helps support cleaner compression and contributes to more dependable sealing performance.

This type of part is especially useful during maintenance where the original dimensions are known and the replacement needs to match both diameter and profile accurately. That keeps repairs more precise and more dependable.

Installed in the proper application, this O-ring helps support dependable sealing and contributes to cleaner overall assembly integrity.

• Buna-N O-ring with 5-1/4 inch ID and 1/8 inch cross-section
• Helps support dependable sealing in larger compatible applications
• Useful when exact dimensional replacement is needed
• Supports cleaner targeted maintenance and repair
• Improves fit accuracy and sealing confidence