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
4.87 X 1.8 B-70	N/A 117821	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 4.87 mm
4.87 X 1.8 B-90	N/A 117822	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 4.87 mm
5x1.80B70	N/A 117823	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 5.00 mm
5 X 1.8 B-90	N/A 117824	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 5.00 mm
5.15x1.80B70	N/A 117825	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 5.15 mm
5.15 X 1.8 B-90	N/A 117826	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 5.15 mm
5.3 X 1.8 B-70	N/A 117827	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 5.30 mm
5.3 X 1.8 B-90	N/A 117828	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 5.30 mm
5.6x1.80B70	N/A 117829	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 5.60 mm
5.6 X 1.8 B-90	N/A 117830	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 5.60 mm
6x1.80B70	N/A 117831	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 6.00 mm
6 X 1.8 B-90	N/A 117832	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 6.00 mm
6.3 X 1.8 B-70	N/A 117833	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 6.30 mm
6.3 X 1.8 B-90	N/A 117834	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 6.30 mm
8.7 X 1.8 B-70	N/A 117835	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 8.70 mm
8.7 X 1.8 B-90	N/A 117836	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 8.70 mm
6.9x1.80B70	N/A 117837	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 6.90 mm
6.9 X 1.8 B-90	N/A 117838	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 6.90 mm
7.5x1.80B70	N/A 117839	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 7.50 mm
7.5 X 1.8 B-90	N/A 117840	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 7.50 mm
8x1.80B70	N/A 117841	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 8.00 mm
8 X 1.8 B-90	N/A 117842	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 8.00 mm
8.5x1.80B70	N/A 117843	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 8.50 mm
8.5 X 1.8 B-90	N/A 117844	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 90	N/A 8.50 mm
8.76 X 1.8 B-70	N/A 117845	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.80 mm	N/A 70	N/A 8.76 mm

N/A
117821

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 4.87 mm

4.87 X 1.8 B-90

N/A
117822

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 4.87 mm

5x1.80B70

N/A
117823

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 5.00 mm

5 X 1.8 B-90

N/A
117824

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 5.00 mm

5.15x1.80B70

N/A
117825

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 5.15 mm

5.15 X 1.8 B-90

N/A
117826

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 5.15 mm

5.3 X 1.8 B-70

N/A
117827

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 5.30 mm

5.3 X 1.8 B-90

N/A
117828

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 5.30 mm

5.6x1.80B70

N/A
117829

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 5.60 mm

5.6 X 1.8 B-90

N/A
117830

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 5.60 mm

6x1.80B70

N/A
117831

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 6.00 mm

6 X 1.8 B-90

N/A
117832

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 6.00 mm

6.3 X 1.8 B-70

N/A
117833

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 6.30 mm

6.3 X 1.8 B-90

N/A
117834

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 6.30 mm

8.7 X 1.8 B-70

N/A
117835

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 8.70 mm

8.7 X 1.8 B-90

N/A
117836

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 8.70 mm

6.9x1.80B70

N/A
117837

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 6.90 mm

6.9 X 1.8 B-90

N/A
117838

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 6.90 mm

7.5x1.80B70

N/A
117839

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 7.50 mm

7.5 X 1.8 B-90

N/A
117840

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 7.50 mm

8x1.80B70

N/A
117841

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 8.00 mm

8 X 1.8 B-90

N/A
117842

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 8.00 mm

8.5x1.80B70

N/A
117843

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 8.50 mm

8.5 X 1.8 B-90

N/A
117844

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 90

N/A 8.50 mm

8.76 X 1.8 B-70

N/A
117845

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.80 mm

N/A 70

N/A 8.76 mm