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
330 X 8 B-90	N/A 124986	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 330.00 mm	N/A Seal Guides
350 X 8 B-70	N/A 124987	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 350.00 mm	N/A Seal Guides
350 X 8 B-90	N/A 124988	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 350.00 mm	N/A Seal Guides
360 X 8 B-70	N/A 124989	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 360.00 mm	N/A Seal Guides
360 X 8 B-90	N/A 124990	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 360.00 mm	N/A Seal Guides
400 X 8 B-70	N/A 124991	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 400.00 mm	N/A Seal Guides
400 X 8 B-90	N/A 124992	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 400.00 mm	N/A Seal Guides
425x8.00B70	N/A 124993	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 425.00 mm	N/A Seal Guides
425 X 8 B-90	N/A 124994	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 425.00 mm	N/A Seal Guides
450 X 8 B-70	N/A 124995	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 450.00 mm	N/A Seal Guides
450 X 8 B-90	N/A 124996	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 450.00 mm	N/A Seal Guides
460 X 8 B-70	N/A 124997	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 460.00 mm	N/A Seal Guides
460 X 8 B-90	N/A 124998	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 460.00 mm	N/A Seal Guides
490 X 8 B-70	N/A 124999	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 490.00 mm	N/A Seal Guides
490 X 8 B-90	N/A 125000	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 490.00 mm	N/A Seal Guides
500 X 8 B-70	N/A 125001	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 500.00 mm	N/A Seal Guides
500 X 8 B-90	N/A 125002	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 500.00 mm	N/A Seal Guides
520 X 8 B-70	N/A 125003	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 520.00 mm	N/A Seal Guides
520 X 8 B-90	N/A 125004	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 520.00 mm	N/A Seal Guides
630 X 8 B-70	N/A 125005	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 630.00 mm	N/A Seal Guides
630 X 8 B-90	N/A 125006	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 630.00 mm	N/A Seal Guides
638 X 8 B-70	N/A 125007	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 638.00 mm	N/A Seal Guides
638 X 8 B-90	N/A 125008	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 638.00 mm	N/A Seal Guides
800 X 8 B-70	N/A 125009	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 70	N/A 800.00 mm	N/A Seal Guides
800 X 8 B-90	N/A 125010	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 8.00 mm	N/A 90	N/A 800.00 mm	N/A Seal Guides

N/A
124986

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 330.00 mm

N/A Seal Guides

350 X 8 B-70

N/A
124987

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 350.00 mm

N/A Seal Guides

350 X 8 B-90

N/A
124988

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 350.00 mm

N/A Seal Guides

360 X 8 B-70

N/A
124989

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 360.00 mm

N/A Seal Guides

360 X 8 B-90

N/A
124990

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 360.00 mm

N/A Seal Guides

400 X 8 B-70

N/A
124991

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 400.00 mm

N/A Seal Guides

400 X 8 B-90

N/A
124992

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 400.00 mm

N/A Seal Guides

425x8.00B70

N/A
124993

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 425.00 mm

N/A Seal Guides

425 X 8 B-90

N/A
124994

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 425.00 mm

N/A Seal Guides

450 X 8 B-70

N/A
124995

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 450.00 mm

N/A Seal Guides

450 X 8 B-90

N/A
124996

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 450.00 mm

N/A Seal Guides

460 X 8 B-70

N/A
124997

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 460.00 mm

N/A Seal Guides

460 X 8 B-90

N/A
124998

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 460.00 mm

N/A Seal Guides

490 X 8 B-70

N/A
124999

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 490.00 mm

N/A Seal Guides

490 X 8 B-90

N/A
125000

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 490.00 mm

N/A Seal Guides

500 X 8 B-70

N/A
125001

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 500.00 mm

N/A Seal Guides

500 X 8 B-90

N/A
125002

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 500.00 mm

N/A Seal Guides

520 X 8 B-70

N/A
125003

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 520.00 mm

N/A Seal Guides

520 X 8 B-90

N/A
125004

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 520.00 mm

N/A Seal Guides

630 X 8 B-70

N/A
125005

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 630.00 mm

N/A Seal Guides

630 X 8 B-90

N/A
125006

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 630.00 mm

N/A Seal Guides

638 X 8 B-70

N/A
125007

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 638.00 mm

N/A Seal Guides

638 X 8 B-90

N/A
125008

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 638.00 mm

N/A Seal Guides

800 X 8 B-70

N/A
125009

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 70

N/A 800.00 mm

N/A Seal Guides

800 X 8 B-90

N/A
125010

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 8.00 mm

N/A 90

N/A 800.00 mm

N/A Seal Guides