Metric Buna O-Rings

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
145 X 5.5 B-90	N/A 123678	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.50 mm	N/A 90	N/A 145.00 mm	N/A Seal Guides
24.2 X 5.7 B-70	N/A 123679	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 24.20 mm	N/A Seal Guides
24.2 X 5.7 B-90	N/A 123680	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 24.20 mm	N/A Seal Guides
35.2 X 5.7 B-70	N/A 123681	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 35.20 mm	N/A Seal Guides
35.2 X 5.7 B-90	N/A 123682	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 35.20 mm	N/A Seal Guides
36.2 X 5.7 B-70	N/A 123683	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 36.20 mm	N/A Seal Guides
36.2 X 5.7 B-90	N/A 123684	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 36.20 mm	N/A Seal Guides
37.2 X 5.7 B-70	N/A 123685	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 37.20 mm	N/A Seal Guides
37.2 X 5.7 B-90	N/A 123686	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 37.20 mm	N/A Seal Guides
39.2 X 5.7 B-70	N/A 123687	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 39.20 mm	N/A Seal Guides
39.2 X 5.7 B-90	N/A 123688	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 39.20 mm	N/A Seal Guides
41.2 X 5.7 B-70	N/A 123689	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 41.20 mm	N/A Seal Guides
41.2 X 5.7 B-90	N/A 123690	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 41.20 mm	N/A Seal Guides
44.2 X 5.7 B-70	N/A 123691	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 44.20 mm	N/A Seal Guides
44.2 X 5.7 B-90	N/A 123692	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 44.20 mm	N/A Seal Guides
44.3 X 5.7 B-70	N/A 123693	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 44.30 mm	N/A Seal Guides
44.3 X 5.7 B-90	N/A 123694	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 44.30 mm	N/A Seal Guides
45.2 X 5.7 B-70	N/A 123695	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 45.20 mm	N/A Seal Guides
45.2 X 5.7 B-90	N/A 123696	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 45.20 mm	N/A Seal Guides
45.3 X 5.7 B-70	N/A 123697	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 45.30 mm	N/A Seal Guides
45.3 X 5.7 B-90	N/A 123698	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 45.30 mm	N/A Seal Guides
47.2 X 5.7 B-70	N/A 123699	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 70	N/A 47.20 mm	N/A Seal Guides
47.2 X 5.7 B-90	N/A 123700	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 5.70 mm	N/A 90	N/A 47.20 mm	N/A Seal Guides
47.6 X 5.7 B-70	N/A 123701	N/A Metric Standard O-Ring	N/A Buna	N/A P48A	N/A 5.70 mm	N/A 70	N/A 47.60 mm	N/A Seal Guides
47.6 X 5.7 B-90	N/A 123702	N/A Metric Standard O-Ring	N/A Buna	N/A P48A	N/A 5.70 mm	N/A 90	N/A 47.60 mm	N/A Seal Guides

N/A
123678

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.50 mm

N/A 90

N/A 145.00 mm

N/A Seal Guides

24.2 X 5.7 B-70

N/A
123679

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 24.20 mm

N/A Seal Guides

24.2 X 5.7 B-90

N/A
123680

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 24.20 mm

N/A Seal Guides

35.2 X 5.7 B-70

N/A
123681

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 35.20 mm

N/A Seal Guides

35.2 X 5.7 B-90

N/A
123682

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 35.20 mm

N/A Seal Guides

36.2 X 5.7 B-70

N/A
123683

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 36.20 mm

N/A Seal Guides

36.2 X 5.7 B-90

N/A
123684

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 36.20 mm

N/A Seal Guides

37.2 X 5.7 B-70

N/A
123685

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 37.20 mm

N/A Seal Guides

37.2 X 5.7 B-90

N/A
123686

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 37.20 mm

N/A Seal Guides

39.2 X 5.7 B-70

N/A
123687

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 39.20 mm

N/A Seal Guides

39.2 X 5.7 B-90

N/A
123688

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 39.20 mm

N/A Seal Guides

41.2 X 5.7 B-70

N/A
123689

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 41.20 mm

N/A Seal Guides

41.2 X 5.7 B-90

N/A
123690

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 41.20 mm

N/A Seal Guides

44.2 X 5.7 B-70

N/A
123691

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 44.20 mm

N/A Seal Guides

44.2 X 5.7 B-90

N/A
123692

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 44.20 mm

N/A Seal Guides

44.3 X 5.7 B-70

N/A
123693

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 44.30 mm

N/A Seal Guides

44.3 X 5.7 B-90

N/A
123694

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 44.30 mm

N/A Seal Guides

45.2 X 5.7 B-70

N/A
123695

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 45.20 mm

N/A Seal Guides

45.2 X 5.7 B-90

N/A
123696

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 45.20 mm

N/A Seal Guides

45.3 X 5.7 B-70

N/A
123697

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 45.30 mm

N/A Seal Guides

45.3 X 5.7 B-90

N/A
123698

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 45.30 mm

N/A Seal Guides

47.2 X 5.7 B-70

N/A
123699

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 70

N/A 47.20 mm

N/A Seal Guides

47.2 X 5.7 B-90

N/A
123700

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 5.70 mm

N/A 90

N/A 47.20 mm

N/A Seal Guides

47.6 X 5.7 B-70

N/A
123701

N/A Metric Standard O-Ring

N/A Buna

N/A P48A

N/A 5.70 mm

N/A 70

N/A 47.60 mm

N/A Seal Guides

47.6 X 5.7 B-90

N/A
123702

N/A Metric Standard O-Ring

N/A Buna

N/A P48A

N/A 5.70 mm

N/A 90

N/A 47.60 mm

N/A Seal Guides