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
36.5 X 3 B-70	N/A 119291	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 36.50 mm
36.5 X 3 B-90	N/A 119292	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 36.50 mm
37 X 3 B-70	N/A 119293	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 37.00 mm
37 X 3 B-90	N/A 119294	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 37.00 mm
37.2 X 3 B-70	N/A 119295	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 37.20 mm
37.2 X 3 B-90	N/A 119296	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 37.20 mm
37.4 X 3 B-70	N/A 119297	N/A Metric Standard O-Ring	N/A Buna	N/A 920	N/A 3.00 mm	N/A 70	N/A 37.40 mm
37.4 X 3 B-90	N/A 119298	N/A Metric Standard O-Ring	N/A Buna	N/A 920	N/A 3.00 mm	N/A 90	N/A 37.40 mm
37.5 X 3 B-70	N/A 119299	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 37.50 mm
37.5 X 3 B-90	N/A 119300	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 37.50 mm
38 X 3 B-70	N/A 119301	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 38.00 mm
38 X 3 B-90	N/A 119302	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 38.00 mm
38.5 X 3 B-70	N/A 119303	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 38.50 mm
38.5 X 3 B-90	N/A 119304	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 38.50 mm
39 X 3 B-70	N/A 119305	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 39.00 mm
39 X 3 B-90	N/A 119306	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 39.00 mm
39.2 X 3 B-70	N/A 119307	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 39.20 mm
39.2 X 3 B-90	N/A 119308	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 39.20 mm
39.5 X 3 B-70	N/A 119309	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 39.50 mm
39.5 X 3 B-90	N/A 119310	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 39.50 mm
40 X 3 B-70	N/A 119311	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 40.00 mm
40 X 3 B-90	N/A 119312	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 40.00 mm
40.2 X 3 B-70	N/A 119313	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 40.20 mm
40.2 X 3 B-90	N/A 119314	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 90	N/A 40.20 mm
41 X 3 B-70	N/A 119315	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.00 mm	N/A 70	N/A 41.00 mm

N/A
119291

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 36.50 mm

36.5 X 3 B-90

N/A
119292

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 36.50 mm

37 X 3 B-70

N/A
119293

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 37.00 mm

37 X 3 B-90

N/A
119294

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 37.00 mm

37.2 X 3 B-70

N/A
119295

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 37.20 mm

37.2 X 3 B-90

N/A
119296

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 37.20 mm

37.4 X 3 B-70

N/A
119297

N/A Metric Standard O-Ring

N/A Buna

N/A 920

N/A 3.00 mm

N/A 70

N/A 37.40 mm

37.4 X 3 B-90

N/A
119298

N/A Metric Standard O-Ring

N/A Buna

N/A 920

N/A 3.00 mm

N/A 90

N/A 37.40 mm

37.5 X 3 B-70

N/A
119299

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 37.50 mm

37.5 X 3 B-90

N/A
119300

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 37.50 mm

38 X 3 B-70

N/A
119301

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 38.00 mm

38 X 3 B-90

N/A
119302

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 38.00 mm

38.5 X 3 B-70

N/A
119303

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 38.50 mm

38.5 X 3 B-90

N/A
119304

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 38.50 mm

39 X 3 B-70

N/A
119305

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 39.00 mm

39 X 3 B-90

N/A
119306

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 39.00 mm

39.2 X 3 B-70

N/A
119307

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 39.20 mm

39.2 X 3 B-90

N/A
119308

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 39.20 mm

39.5 X 3 B-70

N/A
119309

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 39.50 mm

39.5 X 3 B-90

N/A
119310

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 39.50 mm

40 X 3 B-70

N/A
119311

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 40.00 mm

40 X 3 B-90

N/A
119312

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 40.00 mm

40.2 X 3 B-70

N/A
119313

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 40.20 mm

40.2 X 3 B-90

N/A
119314

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 90

N/A 40.20 mm

41 X 3 B-70

N/A
119315

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.00 mm

N/A 70

N/A 41.00 mm