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
191 X 4 B-70	N/A 121649	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 191.00 mm	N/A Seal Guides
191 X 4 B-90	N/A 121650	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 191.00 mm	N/A Seal Guides
192x4.00B70	N/A 121651	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 192.00 mm	N/A Seal Guides
192 X 4 B-90	N/A 121652	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 192.00 mm	N/A Seal Guides
193 X 4 B-70	N/A 121653	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 193.00 mm	N/A Seal Guides
193 X 4 B-90	N/A 121654	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 193.00 mm	N/A Seal Guides
194 X 4 B-70	N/A 121655	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 194.00 mm	N/A Seal Guides
194 X 4 B-90	N/A 121656	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 194.00 mm	N/A Seal Guides
195x4.00B70	N/A 121657	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 195.00 mm	N/A Seal Guides
195 X 4 B-90	N/A 121658	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 195.00 mm	N/A Seal Guides
196x4.00B70	N/A 121659	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 196.00 mm	N/A Seal Guides
196 X 4 B-90	N/A 121660	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 196.00 mm	N/A Seal Guides
197 X 4 B-70	N/A 121661	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 197.00 mm	N/A Seal Guides
197 X 4 B-90	N/A 121662	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 197.00 mm	N/A Seal Guides
198x4.00B70	N/A 121663	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 198.00 mm	N/A Seal Guides
198 X 4 B-90	N/A 121664	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 198.00 mm	N/A Seal Guides
199 X 4 B-70	N/A 121665	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 199.00 mm	N/A Seal Guides
199 X 4 B-90	N/A 121666	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 199.00 mm	N/A Seal Guides
200x4.00B70	N/A 121667	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 200.00 mm	N/A Seal Guides
200 X 4 B-90	N/A 121668	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 200.00 mm	N/A Seal Guides
201 X 4 B-70	N/A 121669	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 201.00 mm	N/A Seal Guides
201 X 4 B-90	N/A 121670	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 201.00 mm	N/A Seal Guides
202x4.00B70	N/A 121671	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 202.00 mm	N/A Seal Guides
202 X 4 B-90	N/A 121672	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 202.00 mm	N/A Seal Guides
203x4.00B70	N/A 121673	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 203.00 mm	N/A Seal Guides

N/A
121649

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 191.00 mm

N/A Seal Guides

191 X 4 B-90

N/A
121650

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 191.00 mm

N/A Seal Guides

192x4.00B70

N/A
121651

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 192.00 mm

N/A Seal Guides

192 X 4 B-90

N/A
121652

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 192.00 mm

N/A Seal Guides

193 X 4 B-70

N/A
121653

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 193.00 mm

N/A Seal Guides

193 X 4 B-90

N/A
121654

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 193.00 mm

N/A Seal Guides

194 X 4 B-70

N/A
121655

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 194.00 mm

N/A Seal Guides

194 X 4 B-90

N/A
121656

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 194.00 mm

N/A Seal Guides

195x4.00B70

N/A
121657

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 195.00 mm

N/A Seal Guides

195 X 4 B-90

N/A
121658

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 195.00 mm

N/A Seal Guides

196x4.00B70

N/A
121659

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 196.00 mm

N/A Seal Guides

196 X 4 B-90

N/A
121660

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 196.00 mm

N/A Seal Guides

197 X 4 B-70

N/A
121661

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 197.00 mm

N/A Seal Guides

197 X 4 B-90

N/A
121662

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 197.00 mm

N/A Seal Guides

198x4.00B70

N/A
121663

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 198.00 mm

N/A Seal Guides

198 X 4 B-90

N/A
121664

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 198.00 mm

N/A Seal Guides

199 X 4 B-70

N/A
121665

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 199.00 mm

N/A Seal Guides

199 X 4 B-90

N/A
121666

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 199.00 mm

N/A Seal Guides

200x4.00B70

N/A
121667

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 200.00 mm

N/A Seal Guides

200 X 4 B-90

N/A
121668

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 200.00 mm

N/A Seal Guides

201 X 4 B-70

N/A
121669

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 201.00 mm

N/A Seal Guides

201 X 4 B-90

N/A
121670

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 201.00 mm

N/A Seal Guides

202x4.00B70

N/A
121671

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 202.00 mm

N/A Seal Guides

202 X 4 B-90

N/A
121672

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 202.00 mm

N/A Seal Guides

203x4.00B70

N/A
121673

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 203.00 mm

N/A Seal Guides