Monroe
OneMonroe
Locations Throughout the Country
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Tel: (877) 740-2007
Fax: (800) 453-9683
Email: sales@askmonroe.com
Website: monroeengineering.com
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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.

Metric O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Reference

Cross Section Width

Durometer

Inside Diameter

Product Guides

Quantity
239.5 X 8.4 B-90 N/A
125086 		N/A Metric Standard O-Ring N/A Buna N/A P240 N/A 8.40 mm N/A 90 N/A 239.50 mm N/A Seal Guides
244.5 X 8.4 B-70 N/A
125087 		N/A Metric Standard O-Ring N/A Buna N/A P245 N/A 8.40 mm N/A 70 N/A 244.50 mm N/A Seal Guides
244.5 X 8.4 B-90 N/A
125088 		N/A Metric Standard O-Ring N/A Buna N/A P245 N/A 8.40 mm N/A 90 N/A 244.50 mm N/A Seal Guides
249.1 X 8.4 B-70 N/A
125089 		N/A Metric Standard O-Ring N/A Buna N/A N/A 8.40 mm N/A 70 N/A 249.10 mm N/A Seal Guides
249.1 X 8.4 B-90 N/A
125090 		N/A Metric Standard O-Ring N/A Buna N/A N/A 8.40 mm N/A 90 N/A 249.10 mm N/A Seal Guides
249.5 X 8.4 B-70 N/A
125091 		N/A Metric Standard O-Ring N/A Buna N/A P250 N/A 8.40 mm N/A 70 N/A 249.50 mm N/A Seal Guides
249.5 X 8.4 B-90 N/A
125092 		N/A Metric Standard O-Ring N/A Buna N/A P250 N/A 8.40 mm N/A 90 N/A 249.50 mm N/A Seal Guides
254.5 X 8.4 B-70 N/A
125093 		N/A Metric Standard O-Ring N/A Buna N/A P255 N/A 8.40 mm N/A 70 N/A 254.50 mm N/A Seal Guides
254.5 X 8.4 B-90 N/A
125094 		N/A Metric Standard O-Ring N/A Buna N/A P255 N/A 8.40 mm N/A 90 N/A 254.50 mm N/A Seal Guides
259.5 X 8.4 B-70 N/A
125095 		N/A Metric Standard O-Ring N/A Buna N/A P26t N/A 8.40 mm N/A 70 N/A 259.50 mm N/A Seal Guides
259.5 X 8.4 B-90 N/A
125096 		N/A Metric Standard O-Ring N/A Buna N/A P26t N/A 8.40 mm N/A 90 N/A 259.50 mm N/A Seal Guides
264.5 X 8.4 B-70 N/A
125097 		N/A Metric Standard O-Ring N/A Buna N/A P265 N/A 8.40 mm N/A 70 N/A 264.50 mm N/A Seal Guides
264.5 X 8.4 B-90 N/A
125098 		N/A Metric Standard O-Ring N/A Buna N/A P265 N/A 8.40 mm N/A 90 N/A 264.50 mm N/A Seal Guides
269.5 X 8.4 B-70 N/A
125099 		N/A Metric Standard O-Ring N/A Buna N/A P271 N/A 8.40 mm N/A 70 N/A 269.50 mm N/A Seal Guides
269.5 X 8.4 B-90 N/A
125100 		N/A Metric Standard O-Ring N/A Buna N/A P271 N/A 8.40 mm N/A 90 N/A 269.50 mm N/A Seal Guides
274.5 X 8.4 B-70 N/A
125101 		N/A Metric Standard O-Ring N/A Buna N/A P275 N/A 8.40 mm N/A 70 N/A 274.50 mm N/A Seal Guides
274.5 X 8.4 B-90 N/A
125102 		N/A Metric Standard O-Ring N/A Buna N/A P275 N/A 8.40 mm N/A 90 N/A 274.50 mm N/A Seal Guides
279.5 X 8.4 B-70 N/A
125103 		N/A Metric Standard O-Ring N/A Buna N/A P280 N/A 8.40 mm N/A 70 N/A 279.50 mm N/A Seal Guides
279.5 X 8.4 B-90 N/A
125104 		N/A Metric Standard O-Ring N/A Buna N/A P280 N/A 8.40 mm N/A 90 N/A 279.50 mm N/A Seal Guides
284.5 X 8.4 B-70 N/A
125105 		N/A Metric Standard O-Ring N/A Buna N/A P285 N/A 8.40 mm N/A 70 N/A 284.50 mm N/A Seal Guides
284.5 X 8.4 B-90 N/A
125106 		N/A Metric Standard O-Ring N/A Buna N/A P285 N/A 8.40 mm N/A 90 N/A 284.50 mm N/A Seal Guides
289.5 X 8.4 B-70 N/A
125107 		N/A Metric Standard O-Ring N/A Buna N/A P290 N/A 8.40 mm N/A 70 N/A 289.50 mm N/A Seal Guides
289.5 X 8.4 B-90 N/A
125108 		N/A Metric Standard O-Ring N/A Buna N/A P290 N/A 8.40 mm N/A 90 N/A 289.50 mm N/A Seal Guides
294.5 X 8.4 B-70 N/A
125109 		N/A Metric Standard O-Ring N/A Buna N/A P295 N/A 8.40 mm N/A 70 N/A 294.50 mm N/A Seal Guides
294.5 X 8.4 B-90 N/A
125110 		N/A Metric Standard O-Ring N/A Buna N/A P295 N/A 8.40 mm N/A 90 N/A 294.50 mm N/A Seal Guides
Unit of Measure
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