OneMonroe’s Metric Buna O-Rings are engineered to provide reliable sealing performance across a variety of industrial and commercial applications. Made from high-quality Buna-N (Nitrile) rubber, these O-rings are known for their excellent resistance to oils, fuels, and other petroleum-based products, making them ideal for use in environments where durable, leak-proof seals are essential. Buna-N’s resilient properties allow it to maintain its integrity even in challenging temperatures, ranging from -40°F to 250°F, ensuring these O-rings can withstand both low and high-stress conditions with ease. With a broad range of metric sizes available, OneMonroe ensures you’ll find the right fit for your exact specifications.
Our Metric Buna O-Rings are crafted to offer outstanding resistance to abrasion and tearing, providing long-lasting performance in rigorous applications. This makes them well-suited for automotive, aerospace, marine, and hydraulic systems, as well as in general maintenance and repair settings. The unique chemical composition of Buna-N allows these O-rings to endure pressure and friction over extended periods without compromising their sealing capabilities, making them a reliable choice for static and dynamic sealing tasks. Each O-ring is manufactured to precise industry standards, ensuring a dependable fit and function in every installation.
With OneMonroe, you’re getting more than just a product; you’re receiving a commitment to quality and expertise. Our team is dedicated to supporting your projects with high-quality metric Buna O-Rings that meet both industry standards and specific customer requirements. We provide technical support to help you select the best O-ring for your application, offering detailed product specifications and guidance. Trust OneMonroe to deliver durable, efficient, and cost-effective sealing solutions tailored to meet the demands of your unique projects.
For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
                            Item # | 
                        
                            IntegrationID | 
                        
                            Type | 
                        
                            Material | 
                        
                            Cross Reference | 
                        
                            Cross Section Width | 
                        
                            Durometer | 
                        
                            Inside Diameter | 
                        
                            Product Guides | 
                                                        
|---|---|---|---|---|---|---|---|---|
| 25.5x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118581  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 25.50 mm | Product Guides N/A Seal Guides | 
| 25.5 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118582  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 25.50 mm | Product Guides N/A Seal Guides | 
| 26x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118583  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 26.00 mm | Product Guides N/A Seal Guides | 
| 26 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118584  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 26.00 mm | Product Guides N/A Seal Guides | 
| 26.5x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118585  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 26.50 mm | Product Guides N/A Seal Guides | 
| 26.5 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118586  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 26.50 mm | Product Guides N/A Seal Guides | 
| 27x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118587  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 27.00 mm | Product Guides N/A Seal Guides | 
| 27 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118588  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 27.00 mm | Product Guides N/A Seal Guides | 
| 27.5x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118589  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 27.50 mm | Product Guides N/A Seal Guides | 
| 27.5 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118590  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 27.50 mm | Product Guides N/A Seal Guides | 
| 28x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118591  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 28.00 mm | Product Guides N/A Seal Guides | 
| 28 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118592  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 28.00 mm | Product Guides N/A Seal Guides | 
| 28.5x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118593  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 28.50 mm | Product Guides N/A Seal Guides | 
| 28.5 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118594  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 28.50 mm | Product Guides N/A Seal Guides | 
| 29x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118595  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 29.00 mm | Product Guides N/A Seal Guides | 
| 29 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118596  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 29.00 mm | Product Guides N/A Seal Guides | 
| 29.5x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118597  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 29.50 mm | Product Guides N/A Seal Guides | 
| 29.5 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118598  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 29.50 mm | Product Guides N/A Seal Guides | 
| 30x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118599  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 30.00 mm | Product Guides N/A Seal Guides | 
| 30 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118600  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 30.00 mm | Product Guides N/A Seal Guides | 
| 30.5 X 2.5 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118601  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 30.50 mm | Product Guides N/A Seal Guides | 
| 30.5 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118602  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 30.50 mm | Product Guides N/A Seal Guides | 
| 31x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118603  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 31.00 mm | Product Guides N/A Seal Guides | 
| 31 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118604  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 90 | Inside Diameter N/A 31.00 mm | Product Guides N/A Seal Guides | 
| 31.5x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118605  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 2.50 mm | Durometer N/A 70 | Inside Diameter N/A 31.50 mm | Product Guides N/A Seal Guides | 
 
