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 | 
|---|---|---|---|---|---|---|---|---|
| 129.4 X 1.78 B-70 | IntegrationID                                                    
 N/A 117771 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS548 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 129.40 mm | Product Guides N/A Seal Guides | 
| 129.4 X 1.78 B-90 | IntegrationID                                                    
 N/A 117772 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS548 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 129.40 mm | Product Guides N/A Seal Guides | 
| 133.07 X 1.78 B-70 | IntegrationID                                                    
 N/A 117773 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 50 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 133.07 mm | Product Guides N/A Seal Guides | 
| 133.07 X 1.78 B-90 | IntegrationID                                                    
 N/A 117774 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A 50 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 133.07 mm | Product Guides N/A Seal Guides | 
| 135.76 X 1.78 B-70 | IntegrationID                                                    
 N/A 117775 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS550 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 135.76 mm | Product Guides N/A Seal Guides | 
| 135.76 X 1.78 B-90 | IntegrationID                                                    
 N/A 117776 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS550 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 135.76 mm | Product Guides N/A Seal Guides | 
| 138.94 X 1.78 B-70 | IntegrationID                                                    
 N/A 117777 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS551 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 138.94 mm | Product Guides N/A Seal Guides | 
| 138.94 X 1.78 B-90 | IntegrationID                                                    
 N/A 117778 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS551 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 138.94 mm | Product Guides N/A Seal Guides | 
| 142.11 X 1.78 B-70 | IntegrationID                                                    
 N/A 117779 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS552 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 142.11 mm | Product Guides N/A Seal Guides | 
| 142.11 X 1.78 B-90 | IntegrationID                                                    
 N/A 117780 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS552 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 142.11 mm | Product Guides N/A Seal Guides | 
| 145.29 X 1.78 B-70 | IntegrationID                                                    
 N/A 117781 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS553 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 145.29 mm | Product Guides N/A Seal Guides | 
| 145.29 X 1.78 B-90 | IntegrationID                                                    
 N/A 117782 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS553 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 145.29 mm | Product Guides N/A Seal Guides | 
| 148.46 X 1.78 B-70 | IntegrationID                                                    
 N/A 117783 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS554 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 148.46 mm | Product Guides N/A Seal Guides | 
| 148.46 X 1.78 B-90 | IntegrationID                                                    
 N/A 117784 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS554 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 148.46 mm | Product Guides N/A Seal Guides | 
| 151.64 X 1.78 B-70 | IntegrationID                                                    
 N/A 117785 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS555 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 151.64 mm | Product Guides N/A Seal Guides | 
| 151.64 X 1.78 B-90 | IntegrationID                                                    
 N/A 117786 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS555 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 151.64 mm | Product Guides N/A Seal Guides | 
| 154.81 X 1.78 B-70 | IntegrationID                                                    
 N/A 117787 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS556 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 154.81 mm | Product Guides N/A Seal Guides | 
| 154.81 X 1.78 B-90 | IntegrationID                                                    
 N/A 117788 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS556 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 154.81 mm | Product Guides N/A Seal Guides | 
| 158 X 1.78 B-70 | IntegrationID                                                    
 N/A 117789 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS557 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 158.00 mm | Product Guides N/A Seal Guides | 
| 158 X 1.78 B-90 | IntegrationID                                                    
 N/A 117790 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS557 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 158.00 mm | Product Guides N/A Seal Guides | 
| 161.16 X 1.78 B-70 | IntegrationID                                                    
 N/A 117791 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS558 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 161.16 mm | Product Guides N/A Seal Guides | 
| 161.16 X 1.78 B-90 | IntegrationID                                                    
 N/A 117792 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS558 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 161.16 mm | Product Guides N/A Seal Guides | 
| 164.34 X 1.78 B-70 | IntegrationID                                                    
 N/A 117793 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS559 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 164.34 mm | Product Guides N/A Seal Guides | 
| 164.34 X 1.78 B-90 | IntegrationID                                                    
 N/A 117794 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS559 | Cross Section Width N/A 1.78 mm | Durometer N/A 90 | Inside Diameter N/A 164.34 mm | Product Guides N/A Seal Guides | 
| 167.51 X 1.78 B-70 | IntegrationID                                                    
 N/A 117795 | Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A BS560 | Cross Section Width N/A 1.78 mm | Durometer N/A 70 | Inside Diameter N/A 167.51 mm | Product Guides N/A Seal Guides | 
 
 

