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
10 X 4 B-90	N/A 121270	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 10.00 mm	N/A Seal Guides
11x4.00B70	N/A 121271	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 11.00 mm	N/A Seal Guides
11 X 4 B-90	N/A 121272	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 11.00 mm	N/A Seal Guides
12x4.00B70	N/A 121273	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 12.00 mm	N/A Seal Guides
12 X 4 B-90	N/A 121274	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 12.00 mm	N/A Seal Guides
13x4.00B70	N/A 121275	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 13.00 mm	N/A Seal Guides
13 X 4 B-90	N/A 121276	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 13.00 mm	N/A Seal Guides
14x4.00B70	N/A 121277	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 14.00 mm	N/A Seal Guides
14 X 4 B-90	N/A 121278	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 14.00 mm	N/A Seal Guides
14.5 X 4 B-70	N/A 121279	N/A Metric Standard O-Ring	N/A Buna	N/A V15	N/A 4.00 mm	N/A 70	N/A 14.50 mm	N/A Seal Guides
14.5 X 4 B-90	N/A 121280	N/A Metric Standard O-Ring	N/A Buna	N/A V15	N/A 4.00 mm	N/A 90	N/A 14.50 mm	N/A Seal Guides
15x4.00B70	N/A 121281	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 15.00 mm	N/A Seal Guides
15 X 4 B-90	N/A 121282	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 15.00 mm	N/A Seal Guides
16x4.00B70	N/A 121283	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 16.00 mm	N/A Seal Guides
16 X 4 B-90	N/A 121284	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 16.00 mm	N/A Seal Guides
17x4.00B70	N/A 121285	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 17.00 mm	N/A Seal Guides
17 X 4 B-90	N/A 121286	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 17.00 mm	N/A Seal Guides
18x4.00B70	N/A 121287	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 18.00 mm	N/A Seal Guides
18 X 4 B-90	N/A 121288	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 18.00 mm	N/A Seal Guides
19x4.00B70	N/A 121289	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 19.00 mm	N/A Seal Guides
19 X 4 B-90	N/A 121290	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 19.00 mm	N/A Seal Guides
20x4.00B70	N/A 121291	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 20.00 mm	N/A Seal Guides
20 X 4 B-90	N/A 121292	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 20.00 mm	N/A Seal Guides
21x4.00B70	N/A 121293	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 21.00 mm	N/A Seal Guides
21 X 4 B-90	N/A 121294	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 21.00 mm	N/A Seal Guides

N/A
121270

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 10.00 mm

N/A Seal Guides

11x4.00B70

N/A
121271

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 11.00 mm

N/A Seal Guides

11 X 4 B-90

N/A
121272

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 11.00 mm

N/A Seal Guides

12x4.00B70

N/A
121273

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 12.00 mm

N/A Seal Guides

12 X 4 B-90

N/A
121274

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 12.00 mm

N/A Seal Guides

13x4.00B70

N/A
121275

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 13.00 mm

N/A Seal Guides

13 X 4 B-90

N/A
121276

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 13.00 mm

N/A Seal Guides

14x4.00B70

N/A
121277

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 14.00 mm

N/A Seal Guides

14 X 4 B-90

N/A
121278

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 14.00 mm

N/A Seal Guides

14.5 X 4 B-70

N/A
121279

N/A Metric Standard O-Ring

N/A Buna

N/A V15

N/A 4.00 mm

N/A 70

N/A 14.50 mm

N/A Seal Guides

14.5 X 4 B-90

N/A
121280

N/A Metric Standard O-Ring

N/A Buna

N/A V15

N/A 4.00 mm

N/A 90

N/A 14.50 mm

N/A Seal Guides

15x4.00B70

N/A
121281

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 15.00 mm

N/A Seal Guides

15 X 4 B-90

N/A
121282

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 15.00 mm

N/A Seal Guides

16x4.00B70

N/A
121283

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 16.00 mm

N/A Seal Guides

16 X 4 B-90

N/A
121284

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 16.00 mm

N/A Seal Guides

17x4.00B70

N/A
121285

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 17.00 mm

N/A Seal Guides

17 X 4 B-90

N/A
121286

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 17.00 mm

N/A Seal Guides

18x4.00B70

N/A
121287

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 18.00 mm

N/A Seal Guides

18 X 4 B-90

N/A
121288

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 18.00 mm

N/A Seal Guides

19x4.00B70

N/A
121289

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 19.00 mm

N/A Seal Guides

19 X 4 B-90

N/A
121290

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 19.00 mm

N/A Seal Guides

20x4.00B70

N/A
121291

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 20.00 mm

N/A Seal Guides

20 X 4 B-90

N/A
121292

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 20.00 mm

N/A Seal Guides

21x4.00B70

N/A
121293

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 21.00 mm

N/A Seal Guides

21 X 4 B-90

N/A
121294

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 21.00 mm

N/A Seal Guides