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 |
|---|---|---|---|---|---|---|---|---|
| 37x6.00B70 |
IntegrationID
N/A 124103 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 37.00 mm | Product Guides N/A Seal Guides |
| 37 X 6 B-90 |
IntegrationID
N/A 124104 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 37.00 mm | Product Guides N/A Seal Guides |
| 38x6.00B70 |
IntegrationID
N/A 124105 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 38.00 mm | Product Guides N/A Seal Guides |
| 38 X 6 B-90 |
IntegrationID
N/A 124106 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 38.00 mm | Product Guides N/A Seal Guides |
| 39x6.00B70 |
IntegrationID
N/A 124107 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 39.00 mm | Product Guides N/A Seal Guides |
| 39 X 6 B-90 |
IntegrationID
N/A 124108 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 39.00 mm | Product Guides N/A Seal Guides |
| 39.5 X 6 B-70 |
IntegrationID
N/A 124109 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 39.50 mm | Product Guides N/A Seal Guides |
| 39.5 X 6 B-90 |
IntegrationID
N/A 124110 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 39.50 mm | Product Guides N/A Seal Guides |
| 40x6.00B70 |
IntegrationID
N/A 124111 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 40.00 mm | Product Guides N/A Seal Guides |
| 40 X 6 B-90 |
IntegrationID
N/A 124112 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 40.00 mm | Product Guides N/A Seal Guides |
| 41x6.00B70 |
IntegrationID
N/A 124113 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 41.00 mm | Product Guides N/A Seal Guides |
| 41 X 6 B-90 |
IntegrationID
N/A 124114 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 41.00 mm | Product Guides N/A Seal Guides |
| 41.5 X 6 B-70 |
IntegrationID
N/A 124115 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 41.50 mm | Product Guides N/A Seal Guides |
| 41.5 X 6 B-90 |
IntegrationID
N/A 124116 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 41.50 mm | Product Guides N/A Seal Guides |
| 42x6.00B70 |
IntegrationID
N/A 124117 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 42.00 mm | Product Guides N/A Seal Guides |
| 42 X 6 B-90 |
IntegrationID
N/A 124118 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 42.00 mm | Product Guides N/A Seal Guides |
| 43x6.00B70 |
IntegrationID
N/A 124119 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 43.00 mm | Product Guides N/A Seal Guides |
| 43 X 6 B-90 |
IntegrationID
N/A 124120 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 43.00 mm | Product Guides N/A Seal Guides |
| 44x6.00B70 |
IntegrationID
N/A 124121 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 44.00 mm | Product Guides N/A Seal Guides |
| 44 X 6 B-90 |
IntegrationID
N/A 124122 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 44.00 mm | Product Guides N/A Seal Guides |
| 44.5x6.00B70 |
IntegrationID
N/A 124123 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 44.50 mm | Product Guides N/A Seal Guides |
| 44.5 X 6 B-90 |
IntegrationID
N/A 124124 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 44.50 mm | Product Guides N/A Seal Guides |
| 45x6.00B70 |
IntegrationID
N/A 124125 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 45.00 mm | Product Guides N/A Seal Guides |
| 45 X 6 B-90 |
IntegrationID
N/A 124126 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 90 | Inside Diameter N/A 45.00 mm | Product Guides N/A Seal Guides |
| 46x6.00B70 |
IntegrationID
N/A 124127 |
Type N/A Metric Standard O-Ring | Material N/A Buna | Cross Reference N/A | Cross Section Width N/A 6.00 mm | Durometer N/A 70 | Inside Diameter N/A 46.00 mm | Product Guides N/A Seal Guides |

