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
2 X 1.5 B-70	N/A 117271	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 2.00 mm	N/A Seal Guides
2 X 1.5 B-90	N/A 117272	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 2.00 mm	N/A Seal Guides
2.5 X 1.5 B-70	N/A 117273	N/A Metric Standard O-Ring	N/A Buna	N/A S3	N/A 1.50 mm	N/A 70	N/A 2.50 mm	N/A Seal Guides
2.5 X 1.5 B-90	N/A 117274	N/A Metric Standard O-Ring	N/A Buna	N/A S3	N/A 1.50 mm	N/A 90	N/A 2.50 mm	N/A Seal Guides
2.8 X 1.5 B-70	N/A 117275	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 2.80 mm	N/A Seal Guides
2.8 X 1.5 B-90	N/A 117276	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 2.80 mm	N/A Seal Guides
3 X 1.5 B-70	N/A 117277	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 3.00 mm	N/A Seal Guides
3 X 1.5 B-90	N/A 117278	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 3.00 mm	N/A Seal Guides
3.5 X 1.5 B-70	N/A 117279	N/A Metric Standard O-Ring	N/A Buna	N/A S4	N/A 1.50 mm	N/A 70	N/A 3.50 mm	N/A Seal Guides
3.5 X 1.5 B-90	N/A 117280	N/A Metric Standard O-Ring	N/A Buna	N/A S4	N/A 1.50 mm	N/A 90	N/A 3.50 mm	N/A Seal Guides
4 X 1.5 B-70	N/A 117281	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 4.00 mm	N/A Seal Guides
4 X 1.5 B-90	N/A 117282	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 4.00 mm	N/A Seal Guides
4.5 X 1.5 B-70	N/A 117283	N/A Metric Standard O-Ring	N/A Buna	N/A S5	N/A 1.50 mm	N/A 70	N/A 4.50 mm	N/A Seal Guides
4.5 X 1.5 B-90	N/A 117284	N/A Metric Standard O-Ring	N/A Buna	N/A S5	N/A 1.50 mm	N/A 90	N/A 4.50 mm	N/A Seal Guides
5 X 1.5 B-70	N/A 117285	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 5.00 mm	N/A Seal Guides
5 X 1.5 B-90	N/A 117286	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 5.00 mm	N/A Seal Guides
5.5 X 1.5 B-70	N/A 117287	N/A Metric Standard O-Ring	N/A Buna	N/A S6	N/A 1.50 mm	N/A 70	N/A 5.50 mm	N/A Seal Guides
5.5 X 1.5 B-90	N/A 117288	N/A Metric Standard O-Ring	N/A Buna	N/A S6	N/A 1.50 mm	N/A 90	N/A 5.50 mm	N/A Seal Guides
6 X 1.5 B-70	N/A 117289	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 6.00 mm	N/A Seal Guides
6 X 1.5 B-90	N/A 117290	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 6.00 mm	N/A Seal Guides
6.5 X 1.5 B-70	N/A 117291	N/A Metric Standard O-Ring	N/A Buna	N/A S7	N/A 1.50 mm	N/A 70	N/A 6.50 mm	N/A Seal Guides
6.5 X 1.5 B-90	N/A 117292	N/A Metric Standard O-Ring	N/A Buna	N/A S7	N/A 1.50 mm	N/A 90	N/A 6.50 mm	N/A Seal Guides
7 X 1.5 B-70	N/A 117293	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 70	N/A 7.00 mm	N/A Seal Guides
7 X 1.5 B-90	N/A 117294	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.50 mm	N/A 90	N/A 7.00 mm	N/A Seal Guides
7.5 X 1.5 B-70	N/A 117295	N/A Metric Standard O-Ring	N/A Buna	N/A S8	N/A 1.50 mm	N/A 70	N/A 7.50 mm	N/A Seal Guides

N/A
117271

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 2.00 mm

N/A Seal Guides

2 X 1.5 B-90

N/A
117272

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 2.00 mm

N/A Seal Guides

2.5 X 1.5 B-70

N/A
117273

N/A Metric Standard O-Ring

N/A Buna

N/A S3

N/A 1.50 mm

N/A 70

N/A 2.50 mm

N/A Seal Guides

2.5 X 1.5 B-90

N/A
117274

N/A Metric Standard O-Ring

N/A Buna

N/A S3

N/A 1.50 mm

N/A 90

N/A 2.50 mm

N/A Seal Guides

2.8 X 1.5 B-70

N/A
117275

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 2.80 mm

N/A Seal Guides

2.8 X 1.5 B-90

N/A
117276

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 2.80 mm

N/A Seal Guides

3 X 1.5 B-70

N/A
117277

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 3.00 mm

N/A Seal Guides

3 X 1.5 B-90

N/A
117278

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 3.00 mm

N/A Seal Guides

3.5 X 1.5 B-70

N/A
117279

N/A Metric Standard O-Ring

N/A Buna

N/A S4

N/A 1.50 mm

N/A 70

N/A 3.50 mm

N/A Seal Guides

3.5 X 1.5 B-90

N/A
117280

N/A Metric Standard O-Ring

N/A Buna

N/A S4

N/A 1.50 mm

N/A 90

N/A 3.50 mm

N/A Seal Guides

4 X 1.5 B-70

N/A
117281

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 4.00 mm

N/A Seal Guides

4 X 1.5 B-90

N/A
117282

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 4.00 mm

N/A Seal Guides

4.5 X 1.5 B-70

N/A
117283

N/A Metric Standard O-Ring

N/A Buna

N/A S5

N/A 1.50 mm

N/A 70

N/A 4.50 mm

N/A Seal Guides

4.5 X 1.5 B-90

N/A
117284

N/A Metric Standard O-Ring

N/A Buna

N/A S5

N/A 1.50 mm

N/A 90

N/A 4.50 mm

N/A Seal Guides

5 X 1.5 B-70

N/A
117285

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 5.00 mm

N/A Seal Guides

5 X 1.5 B-90

N/A
117286

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 5.00 mm

N/A Seal Guides

5.5 X 1.5 B-70

N/A
117287

N/A Metric Standard O-Ring

N/A Buna

N/A S6

N/A 1.50 mm

N/A 70

N/A 5.50 mm

N/A Seal Guides

5.5 X 1.5 B-90

N/A
117288

N/A Metric Standard O-Ring

N/A Buna

N/A S6

N/A 1.50 mm

N/A 90

N/A 5.50 mm

N/A Seal Guides

6 X 1.5 B-70

N/A
117289

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 6.00 mm

N/A Seal Guides

6 X 1.5 B-90

N/A
117290

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 6.00 mm

N/A Seal Guides

6.5 X 1.5 B-70

N/A
117291

N/A Metric Standard O-Ring

N/A Buna

N/A S7

N/A 1.50 mm

N/A 70

N/A 6.50 mm

N/A Seal Guides

6.5 X 1.5 B-90

N/A
117292

N/A Metric Standard O-Ring

N/A Buna

N/A S7

N/A 1.50 mm

N/A 90

N/A 6.50 mm

N/A Seal Guides

7 X 1.5 B-70

N/A
117293

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 70

N/A 7.00 mm

N/A Seal Guides

7 X 1.5 B-90

N/A
117294

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.50 mm

N/A 90

N/A 7.00 mm

N/A Seal Guides

7.5 X 1.5 B-70

N/A
117295

N/A Metric Standard O-Ring

N/A Buna

N/A S8

N/A 1.50 mm

N/A 70

N/A 7.50 mm

N/A Seal Guides