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
6.5 X 2.5 B-90	N/A 118506	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 6.50 mm
7x2.50B70	N/A 118507	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 7.00 mm
7 X 2.5 B-90	N/A 118508	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 7.00 mm
7.5x2.50B70	N/A 118509	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 7.50 mm
7.5 X 2.5 B-90	N/A 118510	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 7.50 mm
8x2.50B70	N/A 118511	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 8.00 mm
8 X 2.5 B-90	N/A 118512	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 8.00 mm
8.5x2.50B70	N/A 118513	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 8.50 mm
8.5 X 2.5 B-90	N/A 118514	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 8.50 mm
9x2.50B70	N/A 118515	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 9.00 mm
9 X 2.5 B-90	N/A 118516	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 9.00 mm
9.5x2.50B70	N/A 118517	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 9.50 mm
9.5 X 2.5 B-90	N/A 118518	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 9.50 mm
10x2.50B70	N/A 118519	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 10.00 mm
10 X 2.5 B-90	N/A 118520	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 10.00 mm
10.5x2.50B70	N/A 118521	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 10.50 mm
10.5 X 2.5 B-90	N/A 118522	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 10.50 mm
11x2.50B70	N/A 118523	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 11.00 mm
11 X 2.5 B-90	N/A 118524	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 11.00 mm
11.5x2.50B70	N/A 118525	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 11.50 mm
11.5 X 2.5 B-90	N/A 118526	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 11.50 mm
12x2.50B70	N/A 118527	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 12.00 mm
12 X 2.5 B-90	N/A 118528	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 12.00 mm
12.5x2.50B70	N/A 118529	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 12.50 mm
12.5 X 2.5 B-90	N/A 118530	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 12.50 mm

N/A
118506

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 6.50 mm

7x2.50B70

N/A
118507

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 7.00 mm

7 X 2.5 B-90

N/A
118508

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 7.00 mm

7.5x2.50B70

N/A
118509

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 7.50 mm

7.5 X 2.5 B-90

N/A
118510

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 7.50 mm

8x2.50B70

N/A
118511

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 8.00 mm

8 X 2.5 B-90

N/A
118512

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 8.00 mm

8.5x2.50B70

N/A
118513

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 8.50 mm

8.5 X 2.5 B-90

N/A
118514

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 8.50 mm

9x2.50B70

N/A
118515

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 9.00 mm

9 X 2.5 B-90

N/A
118516

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 9.00 mm

9.5x2.50B70

N/A
118517

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 9.50 mm

9.5 X 2.5 B-90

N/A
118518

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 9.50 mm

10x2.50B70

N/A
118519

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 10.00 mm

10 X 2.5 B-90

N/A
118520

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 10.00 mm

10.5x2.50B70

N/A
118521

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 10.50 mm

10.5 X 2.5 B-90

N/A
118522

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 10.50 mm

11x2.50B70

N/A
118523

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 11.00 mm

11 X 2.5 B-90

N/A
118524

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 11.00 mm

11.5x2.50B70

N/A
118525

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 11.50 mm

11.5 X 2.5 B-90

N/A
118526

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 11.50 mm

12x2.50B70

N/A
118527

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 12.00 mm

12 X 2.5 B-90

N/A
118528

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 12.00 mm

12.5x2.50B70

N/A
118529

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 12.50 mm

12.5 X 2.5 B-90

N/A
118530

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 12.50 mm