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
299.5 X 8.4 B-70 N/A
125111 		N/A Metric Standard O-Ring N/A Buna N/A P300 N/A 8.40 mm N/A 70 N/A 299.50 mm N/A Seal Guides
299.5 X 8.4 B-90 N/A
125112 		N/A Metric Standard O-Ring N/A Buna N/A P300 N/A 8.40 mm N/A 90 N/A 299.50 mm N/A Seal Guides
304 X 8.4 B-70 N/A
125113 		N/A Metric Standard O-Ring N/A Buna N/A N/A 8.40 mm N/A 70 N/A 304.00 mm N/A Seal Guides
304 X 8.4 B-90 N/A
125114 		N/A Metric Standard O-Ring N/A Buna N/A N/A 8.40 mm N/A 90 N/A 304.00 mm N/A Seal Guides
314.5 X 8.4 B-70 N/A
125115 		N/A Metric Standard O-Ring N/A Buna N/A P315 N/A 8.40 mm N/A 70 N/A 314.50 mm N/A Seal Guides
314.5 X 8.4 B-90 N/A
125116 		N/A Metric Standard O-Ring N/A Buna N/A P315 N/A 8.40 mm N/A 90 N/A 314.50 mm N/A Seal Guides
319.5 X 8.4 B-70 N/A
125117 		N/A Metric Standard O-Ring N/A Buna N/A P320 N/A 8.40 mm N/A 70 N/A 319.50 mm N/A Seal Guides
319.5 X 8.4 B-90 N/A
125118 		N/A Metric Standard O-Ring N/A Buna N/A P320 N/A 8.40 mm N/A 90 N/A 319.50 mm N/A Seal Guides
334.5 X 8.4 B-70 N/A
125119 		N/A Metric Standard O-Ring N/A Buna N/A P335 N/A 8.40 mm N/A 70 N/A 334.50 mm N/A Seal Guides
334.5 X 8.4 B-90 N/A
125120 		N/A Metric Standard O-Ring N/A Buna N/A P335 N/A 8.40 mm N/A 90 N/A 334.50 mm N/A Seal Guides
339.5 X 8.4 B-70 N/A
125121 		N/A Metric Standard O-Ring N/A Buna N/A P340 N/A 8.40 mm N/A 70 N/A 339.50 mm N/A Seal Guides
339.5 X 8.4 B-90 N/A
125122 		N/A Metric Standard O-Ring N/A Buna N/A P340 N/A 8.40 mm N/A 90 N/A 339.50 mm N/A Seal Guides
354.5 X 8.4 B-70 N/A
125123 		N/A Metric Standard O-Ring N/A Buna N/A P355 N/A 8.40 mm N/A 70 N/A 354.50 mm N/A Seal Guides
354.5 X 8.4 B-90 N/A
125124 		N/A Metric Standard O-Ring N/A Buna N/A P355 N/A 8.40 mm N/A 90 N/A 354.50 mm N/A Seal Guides
359.5 X 8.4 B-70 N/A
125125 		N/A Metric Standard O-Ring N/A Buna N/A P360 N/A 8.40 mm N/A 70 N/A 359.50 mm N/A Seal Guides
359.5 X 8.4 B-90 N/A
125126 		N/A Metric Standard O-Ring N/A Buna N/A P360 N/A 8.40 mm N/A 90 N/A 359.50 mm N/A Seal Guides
374.5 X 8.4 B-70 N/A
125127 		N/A Metric Standard O-Ring N/A Buna N/A P375 N/A 8.40 mm N/A 70 N/A 374.50 mm N/A Seal Guides
374.5 X 8.4 B-90 N/A
125128 		N/A Metric Standard O-Ring N/A Buna N/A P375 N/A 8.40 mm N/A 90 N/A 374.50 mm N/A Seal Guides
375 X 8.4 B-70 N/A
125129 		N/A Metric Standard O-Ring N/A Buna N/A N/A 8.40 mm N/A 70 N/A 375.00 mm N/A Seal Guides
375 X 8.4 B-90 N/A
125130 		N/A Metric Standard O-Ring N/A Buna N/A N/A 8.40 mm N/A 90 N/A 375.00 mm N/A Seal Guides
384.5 X 8.4 B-70 N/A
125131 		N/A Metric Standard O-Ring N/A Buna N/A P385 N/A 8.40 mm N/A 70 N/A 384.50 mm N/A Seal Guides
384.5 X 8.4 B-90 N/A
125132 		N/A Metric Standard O-Ring N/A Buna N/A P385 N/A 8.40 mm N/A 90 N/A 384.50 mm N/A Seal Guides
399.5 X 8.4 B-70 N/A
125133 		N/A Metric Standard O-Ring N/A Buna N/A P400 N/A 8.40 mm N/A 70 N/A 399.50 mm N/A Seal Guides
399.5 X 8.4 B-90 N/A
125134 		N/A Metric Standard O-Ring N/A Buna N/A P400 N/A 8.40 mm N/A 90 N/A 399.50 mm N/A Seal Guides
75 X 9 B-70 N/A
125135 		N/A Metric Standard O-Ring N/A Buna N/A N/A 9.00 mm N/A 70 N/A 75.00 mm N/A Seal Guides
Unit of Measure
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