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
316 X 4 B-70	N/A 121899	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 316.00 mm	N/A Seal Guides
316 X 4 B-90	N/A 121900	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 316.00 mm	N/A Seal Guides
317 X 4 B-70	N/A 121901	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 317.00 mm	N/A Seal Guides
317 X 4 B-90	N/A 121902	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 317.00 mm	N/A Seal Guides
318 X 4 B-70	N/A 121903	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 318.00 mm	N/A Seal Guides
318 X 4 B-90	N/A 121904	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 318.00 mm	N/A Seal Guides
319 X 4 B-70	N/A 121905	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 319.00 mm	N/A Seal Guides
319 X 4 B-90	N/A 121906	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 319.00 mm	N/A Seal Guides
320x4.00B70	N/A 121907	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 320.00 mm	N/A Seal Guides
320 X 4 B-90	N/A 121908	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 320.00 mm	N/A Seal Guides
321 X 4 B-70	N/A 121909	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 321.00 mm	N/A Seal Guides
321 X 4 B-90	N/A 121910	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 321.00 mm	N/A Seal Guides
322 X 4 B-70	N/A 121911	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 322.00 mm	N/A Seal Guides
322 X 4 B-90	N/A 121912	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 322.00 mm	N/A Seal Guides
323 X 4 B-70	N/A 121913	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 323.00 mm	N/A Seal Guides
323 X 4 B-90	N/A 121914	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 323.00 mm	N/A Seal Guides
324 X 4 B-70	N/A 121915	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 324.00 mm	N/A Seal Guides
324 X 4 B-90	N/A 121916	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 324.00 mm	N/A Seal Guides
325x4.00B70	N/A 121917	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 325.00 mm	N/A Seal Guides
325 X 4 B-90	N/A 121918	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 325.00 mm	N/A Seal Guides
326 X 4 B-70	N/A 121919	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 326.00 mm	N/A Seal Guides
326 X 4 B-90	N/A 121920	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 326.00 mm	N/A Seal Guides
327x4.00B70	N/A 121921	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 327.00 mm	N/A Seal Guides
327 X 4 B-90	N/A 121922	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 327.00 mm	N/A Seal Guides
328 X 4 B-70	N/A 121923	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 328.00 mm	N/A Seal Guides

N/A
121899

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 316.00 mm

N/A Seal Guides

316 X 4 B-90

N/A
121900

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 316.00 mm

N/A Seal Guides

317 X 4 B-70

N/A
121901

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 317.00 mm

N/A Seal Guides

317 X 4 B-90

N/A
121902

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 317.00 mm

N/A Seal Guides

318 X 4 B-70

N/A
121903

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 318.00 mm

N/A Seal Guides

318 X 4 B-90

N/A
121904

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 318.00 mm

N/A Seal Guides

319 X 4 B-70

N/A
121905

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 319.00 mm

N/A Seal Guides

319 X 4 B-90

N/A
121906

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 319.00 mm

N/A Seal Guides

320x4.00B70

N/A
121907

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 320.00 mm

N/A Seal Guides

320 X 4 B-90

N/A
121908

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 320.00 mm

N/A Seal Guides

321 X 4 B-70

N/A
121909

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 321.00 mm

N/A Seal Guides

321 X 4 B-90

N/A
121910

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 321.00 mm

N/A Seal Guides

322 X 4 B-70

N/A
121911

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 322.00 mm

N/A Seal Guides

322 X 4 B-90

N/A
121912

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 322.00 mm

N/A Seal Guides

323 X 4 B-70

N/A
121913

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 323.00 mm

N/A Seal Guides

323 X 4 B-90

N/A
121914

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 323.00 mm

N/A Seal Guides

324 X 4 B-70

N/A
121915

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 324.00 mm

N/A Seal Guides

324 X 4 B-90

N/A
121916

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 324.00 mm

N/A Seal Guides

325x4.00B70

N/A
121917

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 325.00 mm

N/A Seal Guides

325 X 4 B-90

N/A
121918

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 325.00 mm

N/A Seal Guides

326 X 4 B-70

N/A
121919

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 326.00 mm

N/A Seal Guides

326 X 4 B-90

N/A
121920

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 326.00 mm

N/A Seal Guides

327x4.00B70

N/A
121921

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 327.00 mm

N/A Seal Guides

327 X 4 B-90

N/A
121922

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 327.00 mm

N/A Seal Guides

328 X 4 B-70

N/A
121923

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 328.00 mm

N/A Seal Guides