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 | 
                                                        
|---|---|---|---|---|---|---|---|---|
| 128 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118806  | 
                                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 128.00 mm | Product Guides N/A Seal Guides | 
| 129x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118807  | 
                                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 129.00 mm | Product Guides N/A Seal Guides | 
| 129 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118808  | 
                                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 129.00 mm | Product Guides N/A Seal Guides | 
| 130x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118809  | 
                                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 130.00 mm | Product Guides N/A Seal Guides | 
| 130 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118810  | 
                                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 130.00 mm | Product Guides N/A Seal Guides | 
| 131x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118811  | 
                                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 131.00 mm | Product Guides N/A Seal Guides | 
| 131 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118812  | 
                                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 131.00 mm | Product Guides N/A Seal Guides | 
| 132x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118813  | 
                                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 132.00 mm | Product Guides N/A Seal Guides | 
| 132 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118814  | 
                                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 132.00 mm | Product Guides N/A Seal Guides | 
| 133 X 2.5 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118815  | 
                                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 133.00 mm | Product Guides N/A Seal Guides | 
| 133 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118816  | 
                                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 133.00 mm | Product Guides N/A Seal Guides | 
| 134 X 2.5 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118817  | 
                                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 134.00 mm | Product Guides N/A Seal Guides | 
| 134 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118818  | 
                                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 134.00 mm | Product Guides N/A Seal Guides | 
| 135x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118819  | 
                                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 135.00 mm | Product Guides N/A Seal Guides | 
| 135 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118820  | 
                                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 135.00 mm | Product Guides N/A Seal Guides | 
| 136x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118821  | 
                                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 136.00 mm | Product Guides N/A Seal Guides | 
| 136 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118822  | 
                                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 136.00 mm | Product Guides N/A Seal Guides | 
| 137x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118823  | 
                                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 137.00 mm | Product Guides N/A Seal Guides | 
| 137 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118824  | 
                                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 137.00 mm | Product Guides N/A Seal Guides | 
| 138x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118825  | 
                                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 138.00 mm | Product Guides N/A Seal Guides | 
| 138 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118826  | 
                                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 138.00 mm | Product Guides N/A Seal Guides | 
| 139 X 2.5 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118827  | 
                                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 139.00 mm | Product Guides N/A Seal Guides | 
| 139 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118828  | 
                                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 139.00 mm | Product Guides N/A Seal Guides | 
| 140x2.50B70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118829  | 
                                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 140.00 mm | Product Guides N/A Seal Guides | 
| 140 X 2.5 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         118830  | 
                                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 140.00 mm | Product Guides N/A Seal Guides | 
 
