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
28.3 X 1.78 B-90	N/A 117696	N/A Metric Standard O-Ring	N/A Buna	N/A 24	N/A 1.78 mm	N/A 90	N/A 28.30 mm
29.87 X 1.78 B-70	N/A 117697	N/A Metric Standard O-Ring	N/A Buna	N/A 25	N/A 1.78 mm	N/A 70	N/A 29.87 mm
29.87 X 1.78 B-90	N/A 117698	N/A Metric Standard O-Ring	N/A Buna	N/A 25	N/A 1.78 mm	N/A 90	N/A 29.87 mm
31.47 X 1.78 B-70	N/A 117699	N/A Metric Standard O-Ring	N/A Buna	N/A 26	N/A 1.78 mm	N/A 70	N/A 31.47 mm
31.47 X 1.78 B-90	N/A 117700	N/A Metric Standard O-Ring	N/A Buna	N/A 26	N/A 1.78 mm	N/A 90	N/A 31.47 mm
33.05 X 1.78 B-70	N/A 117701	N/A Metric Standard O-Ring	N/A Buna	N/A 27	N/A 1.78 mm	N/A 70	N/A 33.05 mm
33.05 X 1.78 B-90	N/A 117702	N/A Metric Standard O-Ring	N/A Buna	N/A 27	N/A 1.78 mm	N/A 90	N/A 33.05 mm
34.65 X 1.78 B-70	N/A 117703	N/A Metric Standard O-Ring	N/A Buna	N/A 28	N/A 1.78 mm	N/A 70	N/A 34.65 mm
34.65 X 1.78 B-90	N/A 117704	N/A Metric Standard O-Ring	N/A Buna	N/A 28	N/A 1.78 mm	N/A 90	N/A 34.65 mm
36 X 1.78 B-70	N/A 117705	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.78 mm	N/A 70	N/A 36.00 mm
36 X 1.78 B-90	N/A 117706	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.78 mm	N/A 90	N/A 36.00 mm
36.27 X 1.78 B-70	N/A 117707	N/A Metric Standard O-Ring	N/A Buna	N/A BS517	N/A 1.78 mm	N/A 70	N/A 36.27 mm
36.27 X 1.78 B-90	N/A 117708	N/A Metric Standard O-Ring	N/A Buna	N/A BS517	N/A 1.78 mm	N/A 90	N/A 36.27 mm
37.82 X 1.78 B-70	N/A 117709	N/A Metric Standard O-Ring	N/A Buna	N/A 29	N/A 1.78 mm	N/A 70	N/A 37.82 mm
37.82 X 1.78 B-90	N/A 117710	N/A Metric Standard O-Ring	N/A Buna	N/A 29	N/A 1.78 mm	N/A 90	N/A 37.82 mm
39.45 X 1.78 B-70	N/A 117711	N/A Metric Standard O-Ring	N/A Buna	N/A BS519	N/A 1.78 mm	N/A 70	N/A 39.45 mm
39.45 X 1.78 B-90	N/A 117712	N/A Metric Standard O-Ring	N/A Buna	N/A BS519	N/A 1.78 mm	N/A 90	N/A 39.45 mm
41 X 1.78 B-70	N/A 117713	N/A Metric Standard O-Ring	N/A Buna	N/A 30	N/A 1.78 mm	N/A 70	N/A 41.00 mm
41 X 1.78 B-90	N/A 117714	N/A Metric Standard O-Ring	N/A Buna	N/A 30	N/A 1.78 mm	N/A 90	N/A 41.00 mm
44.17 X 1.78 B-70	N/A 117715	N/A Metric Standard O-Ring	N/A Buna	N/A 31	N/A 1.78 mm	N/A 70	N/A 44.17 mm
44.17 X 1.78 B-90	N/A 117716	N/A Metric Standard O-Ring	N/A Buna	N/A 31	N/A 1.78 mm	N/A 90	N/A 44.17 mm
45.84 X 1.78 B-70	N/A 117717	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.78 mm	N/A 70	N/A 45.84 mm
45.84 X 1.78 B-90	N/A 117718	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.78 mm	N/A 90	N/A 45.84 mm
47.35 X 1.78 B-70	N/A 117719	N/A Metric Standard O-Ring	N/A Buna	N/A 32	N/A 1.78 mm	N/A 70	N/A 47.35 mm
47.35 X 1.78 B-90	N/A 117720	N/A Metric Standard O-Ring	N/A Buna	N/A 32	N/A 1.78 mm	N/A 90	N/A 47.35 mm

N/A
117696

N/A Metric Standard O-Ring

N/A Buna

N/A 24

N/A 1.78 mm

N/A 90

N/A 28.30 mm

29.87 X 1.78 B-70

N/A
117697

N/A Metric Standard O-Ring

N/A Buna

N/A 25

N/A 1.78 mm

N/A 70

N/A 29.87 mm

29.87 X 1.78 B-90

N/A
117698

N/A Metric Standard O-Ring

N/A Buna

N/A 25

N/A 1.78 mm

N/A 90

N/A 29.87 mm

31.47 X 1.78 B-70

N/A
117699

N/A Metric Standard O-Ring

N/A Buna

N/A 26

N/A 1.78 mm

N/A 70

N/A 31.47 mm

31.47 X 1.78 B-90

N/A
117700

N/A Metric Standard O-Ring

N/A Buna

N/A 26

N/A 1.78 mm

N/A 90

N/A 31.47 mm

33.05 X 1.78 B-70

N/A
117701

N/A Metric Standard O-Ring

N/A Buna

N/A 27

N/A 1.78 mm

N/A 70

N/A 33.05 mm

33.05 X 1.78 B-90

N/A
117702

N/A Metric Standard O-Ring

N/A Buna

N/A 27

N/A 1.78 mm

N/A 90

N/A 33.05 mm

34.65 X 1.78 B-70

N/A
117703

N/A Metric Standard O-Ring

N/A Buna

N/A 28

N/A 1.78 mm

N/A 70

N/A 34.65 mm

34.65 X 1.78 B-90

N/A
117704

N/A Metric Standard O-Ring

N/A Buna

N/A 28

N/A 1.78 mm

N/A 90

N/A 34.65 mm

36 X 1.78 B-70

N/A
117705

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.78 mm

N/A 70

N/A 36.00 mm

36 X 1.78 B-90

N/A
117706

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.78 mm

N/A 90

N/A 36.00 mm

36.27 X 1.78 B-70

N/A
117707

N/A Metric Standard O-Ring

N/A Buna

N/A BS517

N/A 1.78 mm

N/A 70

N/A 36.27 mm

36.27 X 1.78 B-90

N/A
117708

N/A Metric Standard O-Ring

N/A Buna

N/A BS517

N/A 1.78 mm

N/A 90

N/A 36.27 mm

37.82 X 1.78 B-70

N/A
117709

N/A Metric Standard O-Ring

N/A Buna

N/A 29

N/A 1.78 mm

N/A 70

N/A 37.82 mm

37.82 X 1.78 B-90

N/A
117710

N/A Metric Standard O-Ring

N/A Buna

N/A 29

N/A 1.78 mm

N/A 90

N/A 37.82 mm

39.45 X 1.78 B-70

N/A
117711

N/A Metric Standard O-Ring

N/A Buna

N/A BS519

N/A 1.78 mm

N/A 70

N/A 39.45 mm

39.45 X 1.78 B-90

N/A
117712

N/A Metric Standard O-Ring

N/A Buna

N/A BS519

N/A 1.78 mm

N/A 90

N/A 39.45 mm

41 X 1.78 B-70

N/A
117713

N/A Metric Standard O-Ring

N/A Buna

N/A 30

N/A 1.78 mm

N/A 70

N/A 41.00 mm

41 X 1.78 B-90

N/A
117714

N/A Metric Standard O-Ring

N/A Buna

N/A 30

N/A 1.78 mm

N/A 90

N/A 41.00 mm

44.17 X 1.78 B-70

N/A
117715

N/A Metric Standard O-Ring

N/A Buna

N/A 31

N/A 1.78 mm

N/A 70

N/A 44.17 mm

44.17 X 1.78 B-90

N/A
117716

N/A Metric Standard O-Ring

N/A Buna

N/A 31

N/A 1.78 mm

N/A 90

N/A 44.17 mm

45.84 X 1.78 B-70

N/A
117717

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.78 mm

N/A 70

N/A 45.84 mm

45.84 X 1.78 B-90

N/A
117718

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.78 mm

N/A 90

N/A 45.84 mm

47.35 X 1.78 B-70

N/A
117719

N/A Metric Standard O-Ring

N/A Buna

N/A 32

N/A 1.78 mm

N/A 70

N/A 47.35 mm

47.35 X 1.78 B-90

N/A
117720

N/A Metric Standard O-Ring

N/A Buna

N/A 32

N/A 1.78 mm

N/A 90

N/A 47.35 mm