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
138 X 6 B-90	N/A 124278	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 138.00 mm	N/A Seal Guides
139.2 X 6 B-70	N/A 124279	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 139.20 mm	N/A Seal Guides
139.2 X 6 B-90	N/A 124280	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 139.20 mm	N/A Seal Guides
140x6.00B70	N/A 124281	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 140.00 mm	N/A Seal Guides
140 X 6 B-90	N/A 124282	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 140.00 mm	N/A Seal Guides
142x6.00B70	N/A 124283	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 142.00 mm	N/A Seal Guides
142 X 6 B-90	N/A 124284	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 142.00 mm	N/A Seal Guides
143 X 6 B-70	N/A 124285	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 143.00 mm	N/A Seal Guides
143 X 6 B-90	N/A 124286	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 143.00 mm	N/A Seal Guides
145x6.00B70	N/A 124287	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 145.00 mm	N/A Seal Guides
145 X 6 B-90	N/A 124288	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 145.00 mm	N/A Seal Guides
146x6.00B70	N/A 124289	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 146.00 mm	N/A Seal Guides
146 X 6 B-90	N/A 124290	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 146.00 mm	N/A Seal Guides
148x6.00B70	N/A 124291	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 148.00 mm	N/A Seal Guides
148 X 6 B-90	N/A 124292	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 148.00 mm	N/A Seal Guides
150x6.00B70	N/A 124293	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 150.00 mm	N/A Seal Guides
150 X 6 B-90	N/A 124294	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 150.00 mm	N/A Seal Guides
153x6.00B70	N/A 124295	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 153.00 mm	N/A Seal Guides
153 X 6 B-90	N/A 124296	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 153.00 mm	N/A Seal Guides
154x6.00B70	N/A 124297	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 154.00 mm	N/A Seal Guides
154 X 6 B-90	N/A 124298	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 154.00 mm	N/A Seal Guides
155x6.00B70	N/A 124299	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 155.00 mm	N/A Seal Guides
155 X 6 B-90	N/A 124300	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 155.00 mm	N/A Seal Guides
155.5 X 6 B-70	N/A 124301	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 70	N/A 155.50 mm	N/A Seal Guides
155.5 X 6 B-90	N/A 124302	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 6.00 mm	N/A 90	N/A 155.50 mm	N/A Seal Guides

N/A
124278

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 138.00 mm

N/A Seal Guides

139.2 X 6 B-70

N/A
124279

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 139.20 mm

N/A Seal Guides

139.2 X 6 B-90

N/A
124280

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 139.20 mm

N/A Seal Guides

140x6.00B70

N/A
124281

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 140.00 mm

N/A Seal Guides

140 X 6 B-90

N/A
124282

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 140.00 mm

N/A Seal Guides

142x6.00B70

N/A
124283

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 142.00 mm

N/A Seal Guides

142 X 6 B-90

N/A
124284

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 142.00 mm

N/A Seal Guides

143 X 6 B-70

N/A
124285

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 143.00 mm

N/A Seal Guides

143 X 6 B-90

N/A
124286

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 143.00 mm

N/A Seal Guides

145x6.00B70

N/A
124287

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 145.00 mm

N/A Seal Guides

145 X 6 B-90

N/A
124288

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 145.00 mm

N/A Seal Guides

146x6.00B70

N/A
124289

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 146.00 mm

N/A Seal Guides

146 X 6 B-90

N/A
124290

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 146.00 mm

N/A Seal Guides

148x6.00B70

N/A
124291

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 148.00 mm

N/A Seal Guides

148 X 6 B-90

N/A
124292

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 148.00 mm

N/A Seal Guides

150x6.00B70

N/A
124293

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 150.00 mm

N/A Seal Guides

150 X 6 B-90

N/A
124294

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 150.00 mm

N/A Seal Guides

153x6.00B70

N/A
124295

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 153.00 mm

N/A Seal Guides

153 X 6 B-90

N/A
124296

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 153.00 mm

N/A Seal Guides

154x6.00B70

N/A
124297

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 154.00 mm

N/A Seal Guides

154 X 6 B-90

N/A
124298

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 154.00 mm

N/A Seal Guides

155x6.00B70

N/A
124299

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 155.00 mm

N/A Seal Guides

155 X 6 B-90

N/A
124300

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 155.00 mm

N/A Seal Guides

155.5 X 6 B-70

N/A
124301

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 70

N/A 155.50 mm

N/A Seal Guides

155.5 X 6 B-90

N/A
124302

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 6.00 mm

N/A 90

N/A 155.50 mm

N/A Seal Guides