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 | 
                                                        
|---|---|---|---|---|---|---|---|---|
| 88.62 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117746  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 43 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 88.62 mm | Product Guides N/A Seal Guides | 
| 91.7 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117747  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS536 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 91.70 mm | Product Guides N/A Seal Guides | 
| 91.7 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117748  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS536 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 91.70 mm | Product Guides N/A Seal Guides | 
| 94.97 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117749  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 44 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 94.97 mm | Product Guides N/A Seal Guides | 
| 94.97 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117750  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 44 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 94.97 mm | Product Guides N/A Seal Guides | 
| 98.05 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117751  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS538 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 98.05 mm | Product Guides N/A Seal Guides | 
| 98.05 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117752  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS538 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 98.05 mm | Product Guides N/A Seal Guides | 
| 101.32 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117753  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 45 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 101.32 mm | Product Guides N/A Seal Guides | 
| 101.32 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117754  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 45 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 101.32 mm | Product Guides N/A Seal Guides | 
| 104.4 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117755  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS540 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 104.40 mm | Product Guides N/A Seal Guides | 
| 104.4 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117756  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS540 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 104.40 mm | Product Guides N/A Seal Guides | 
| 107.67 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117757  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 46 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 107.67 mm | Product Guides N/A Seal Guides | 
| 107.67 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117758  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 46 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 107.67 mm | Product Guides N/A Seal Guides | 
| 110.74 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117759  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS542 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 110.74 mm | Product Guides N/A Seal Guides | 
| 110.74 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117760  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS542 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 110.74 mm | Product Guides N/A Seal Guides | 
| 114.02 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117761  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 47 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 114.02 mm | Product Guides N/A Seal Guides | 
| 114.02 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117762  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 47 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 114.02 mm | Product Guides N/A Seal Guides | 
| 117.1 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117763  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS544 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 117.10 mm | Product Guides N/A Seal Guides | 
| 117.1 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117764  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS544 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 117.10 mm | Product Guides N/A Seal Guides | 
| 120.37 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117765  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 48 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 120.37 mm | Product Guides N/A Seal Guides | 
| 120.37 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117766  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 48 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 120.37 mm | Product Guides N/A Seal Guides | 
| 123.44 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117767  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS546 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 123.44 mm | Product Guides N/A Seal Guides | 
| 123.44 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117768  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS546 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 123.44 mm | Product Guides N/A Seal Guides | 
| 126.72 X 1.78 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117769  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 49 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 126.72 mm | Product Guides N/A Seal Guides | 
| 126.72 X 1.78 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         117770  | 
                                Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 49 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 126.72 mm | Product Guides N/A Seal Guides | 
 
