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
19 X 2.5 B-90	N/A 118556	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 19.00 mm
19.5x2.50B70	N/A 118557	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 19.50 mm
19.5 X 2.5 B-90	N/A 118558	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 19.50 mm
20x2.50B70	N/A 118559	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 20.00 mm
20 X 2.5 B-90	N/A 118560	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 20.00 mm
20.5x2.50B70	N/A 118561	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 20.50 mm
20.5 X 2.5 B-90	N/A 118562	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 20.50 mm
21x2.50B70	N/A 118563	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 21.00 mm
21 X 2.5 B-90	N/A 118564	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 21.00 mm
21.5x2.50B70	N/A 118565	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 21.50 mm
21.5 X 2.5 B-90	N/A 118566	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 21.50 mm
22x2.50B70	N/A 118567	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 22.00 mm
22 X 2.5 B-90	N/A 118568	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 22.00 mm
22.5x2.50B70	N/A 118569	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 22.50 mm
22.5 X 2.5 B-90	N/A 118570	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 22.50 mm
23 X 2.5 B-70	N/A 118571	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 23.00 mm
23 X 2.5 B-90	N/A 118572	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 23.00 mm
23.5x2.50B70	N/A 118573	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 23.50 mm
23.5 X 2.5 B-90	N/A 118574	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 23.50 mm
24x2.50B70	N/A 118575	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 24.00 mm
24 X 2.5 B-90	N/A 118576	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 24.00 mm
24.5x2.50B70	N/A 118577	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 24.50 mm
24.5 X 2.5 B-90	N/A 118578	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 24.50 mm
25x2.50B70	N/A 118579	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 70	N/A 25.00 mm
25 X 2.5 B-90	N/A 118580	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.50 mm	N/A 90	N/A 25.00 mm

N/A
118556

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 19.00 mm

19.5x2.50B70

N/A
118557

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 19.50 mm

19.5 X 2.5 B-90

N/A
118558

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 19.50 mm

20x2.50B70

N/A
118559

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 20.00 mm

20 X 2.5 B-90

N/A
118560

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 20.00 mm

20.5x2.50B70

N/A
118561

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 20.50 mm

20.5 X 2.5 B-90

N/A
118562

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 20.50 mm

21x2.50B70

N/A
118563

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 21.00 mm

21 X 2.5 B-90

N/A
118564

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 21.00 mm

21.5x2.50B70

N/A
118565

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 21.50 mm

21.5 X 2.5 B-90

N/A
118566

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 21.50 mm

22x2.50B70

N/A
118567

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 22.00 mm

22 X 2.5 B-90

N/A
118568

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 22.00 mm

22.5x2.50B70

N/A
118569

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 22.50 mm

22.5 X 2.5 B-90

N/A
118570

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 22.50 mm

23 X 2.5 B-70

N/A
118571

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 23.00 mm

23 X 2.5 B-90

N/A
118572

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 23.00 mm

23.5x2.50B70

N/A
118573

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 23.50 mm

23.5 X 2.5 B-90

N/A
118574

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 23.50 mm

24x2.50B70

N/A
118575

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 24.00 mm

24 X 2.5 B-90

N/A
118576

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 24.00 mm

24.5x2.50B70

N/A
118577

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 24.50 mm

24.5 X 2.5 B-90

N/A
118578

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 24.50 mm

25x2.50B70

N/A
118579

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 70

N/A 25.00 mm

25 X 2.5 B-90

N/A
118580

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.50 mm

N/A 90

N/A 25.00 mm