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
234.54 X 3.53 B-70	N/A 121045	N/A Metric Standard O-Ring	N/A Buna	N/A 271	N/A 3.53 mm	N/A 70	N/A 234.54 mm
234.54 X 3.53 B-90	N/A 121046	N/A Metric Standard O-Ring	N/A Buna	N/A 271	N/A 3.53 mm	N/A 90	N/A 234.54 mm
240.89 X 3.53 B-70	N/A 121047	N/A Metric Standard O-Ring	N/A Buna	N/A 272	N/A 3.53 mm	N/A 70	N/A 240.89 mm
240.89 X 3.53 B-90	N/A 121048	N/A Metric Standard O-Ring	N/A Buna	N/A 272	N/A 3.53 mm	N/A 90	N/A 240.89 mm
247.24 X 3.53 B-70	N/A 121049	N/A Metric Standard O-Ring	N/A Buna	N/A 273	N/A 3.53 mm	N/A 70	N/A 247.24 mm
247.24 X 3.53 B-90	N/A 121050	N/A Metric Standard O-Ring	N/A Buna	N/A 273	N/A 3.53 mm	N/A 90	N/A 247.24 mm
253.59 X 3.53 B-70	N/A 121051	N/A Metric Standard O-Ring	N/A Buna	N/A 274	N/A 3.53 mm	N/A 70	N/A 253.59 mm
253.59 X 3.53 B-90	N/A 121052	N/A Metric Standard O-Ring	N/A Buna	N/A 274	N/A 3.53 mm	N/A 90	N/A 253.59 mm
266.29 X 3.53 B-70	N/A 121053	N/A Metric Standard O-Ring	N/A Buna	N/A 275	N/A 3.53 mm	N/A 70	N/A 266.29 mm
266.29 X 3.53 B-90	N/A 121054	N/A Metric Standard O-Ring	N/A Buna	N/A 275	N/A 3.53 mm	N/A 90	N/A 266.29 mm
278.99 X 3.53 B-70	N/A 121055	N/A Metric Standard O-Ring	N/A Buna	N/A 276	N/A 3.53 mm	N/A 70	N/A 278.99 mm
278.99 X 3.53 B-90	N/A 121056	N/A Metric Standard O-Ring	N/A Buna	N/A 276	N/A 3.53 mm	N/A 90	N/A 278.99 mm
291.69 X 3.53 B-70	N/A 121057	N/A Metric Standard O-Ring	N/A Buna	N/A 277	N/A 3.53 mm	N/A 70	N/A 291.69 mm
291.69 X 3.53 B-90	N/A 121058	N/A Metric Standard O-Ring	N/A Buna	N/A 277	N/A 3.53 mm	N/A 90	N/A 291.69 mm
304.39 X 3.53 B-70	N/A 121059	N/A Metric Standard O-Ring	N/A Buna	N/A 278	N/A 3.53 mm	N/A 70	N/A 304.39 mm
304.39 X 3.53 B-90	N/A 121060	N/A Metric Standard O-Ring	N/A Buna	N/A 278	N/A 3.53 mm	N/A 90	N/A 304.39 mm
319.2 X 3.53 B-70	N/A 121061	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.53 mm	N/A 70	N/A 319.20 mm
319.2 X 3.53 B-90	N/A 121062	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.53 mm	N/A 90	N/A 319.20 mm
329.79 X 3.53 B-70	N/A 121063	N/A Metric Standard O-Ring	N/A Buna	N/A 279	N/A 3.53 mm	N/A 70	N/A 329.79 mm
329.79 X 3.53 B-90	N/A 121064	N/A Metric Standard O-Ring	N/A Buna	N/A 279	N/A 3.53 mm	N/A 90	N/A 329.79 mm
355.19 X 3.53 B-70	N/A 121065	N/A Metric Standard O-Ring	N/A Buna	N/A 280	N/A 3.53 mm	N/A 70	N/A 355.19 mm
355.19 X 3.53 B-90	N/A 121066	N/A Metric Standard O-Ring	N/A Buna	N/A 280	N/A 3.53 mm	N/A 90	N/A 355.19 mm
380.59 X 3.53 B-70	N/A 121067	N/A Metric Standard O-Ring	N/A Buna	N/A 281	N/A 3.53 mm	N/A 70	N/A 380.59 mm
380.59 X 3.53 B-90	N/A 121068	N/A Metric Standard O-Ring	N/A Buna	N/A 281	N/A 3.53 mm	N/A 90	N/A 380.59 mm
405.26 X 3.53 B-70	N/A 121069	N/A Metric Standard O-Ring	N/A Buna	N/A 282	N/A 3.53 mm	N/A 70	N/A 405.26 mm

N/A
121045

N/A Metric Standard O-Ring

N/A Buna

N/A 271

N/A 3.53 mm

N/A 70

N/A 234.54 mm

234.54 X 3.53 B-90

N/A
121046

N/A Metric Standard O-Ring

N/A Buna

N/A 271

N/A 3.53 mm

N/A 90

N/A 234.54 mm

240.89 X 3.53 B-70

N/A
121047

N/A Metric Standard O-Ring

N/A Buna

N/A 272

N/A 3.53 mm

N/A 70

N/A 240.89 mm

240.89 X 3.53 B-90

N/A
121048

N/A Metric Standard O-Ring

N/A Buna

N/A 272

N/A 3.53 mm

N/A 90

N/A 240.89 mm

247.24 X 3.53 B-70

N/A
121049

N/A Metric Standard O-Ring

N/A Buna

N/A 273

N/A 3.53 mm

N/A 70

N/A 247.24 mm

247.24 X 3.53 B-90

N/A
121050

N/A Metric Standard O-Ring

N/A Buna

N/A 273

N/A 3.53 mm

N/A 90

N/A 247.24 mm

253.59 X 3.53 B-70

N/A
121051

N/A Metric Standard O-Ring

N/A Buna

N/A 274

N/A 3.53 mm

N/A 70

N/A 253.59 mm

253.59 X 3.53 B-90

N/A
121052

N/A Metric Standard O-Ring

N/A Buna

N/A 274

N/A 3.53 mm

N/A 90

N/A 253.59 mm

266.29 X 3.53 B-70

N/A
121053

N/A Metric Standard O-Ring

N/A Buna

N/A 275

N/A 3.53 mm

N/A 70

N/A 266.29 mm

266.29 X 3.53 B-90

N/A
121054

N/A Metric Standard O-Ring

N/A Buna

N/A 275

N/A 3.53 mm

N/A 90

N/A 266.29 mm

278.99 X 3.53 B-70

N/A
121055

N/A Metric Standard O-Ring

N/A Buna

N/A 276

N/A 3.53 mm

N/A 70

N/A 278.99 mm

278.99 X 3.53 B-90

N/A
121056

N/A Metric Standard O-Ring

N/A Buna

N/A 276

N/A 3.53 mm

N/A 90

N/A 278.99 mm

291.69 X 3.53 B-70

N/A
121057

N/A Metric Standard O-Ring

N/A Buna

N/A 277

N/A 3.53 mm

N/A 70

N/A 291.69 mm

291.69 X 3.53 B-90

N/A
121058

N/A Metric Standard O-Ring

N/A Buna

N/A 277

N/A 3.53 mm

N/A 90

N/A 291.69 mm

304.39 X 3.53 B-70

N/A
121059

N/A Metric Standard O-Ring

N/A Buna

N/A 278

N/A 3.53 mm

N/A 70

N/A 304.39 mm

304.39 X 3.53 B-90

N/A
121060

N/A Metric Standard O-Ring

N/A Buna

N/A 278

N/A 3.53 mm

N/A 90

N/A 304.39 mm

319.2 X 3.53 B-70

N/A
121061

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.53 mm

N/A 70

N/A 319.20 mm

319.2 X 3.53 B-90

N/A
121062

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.53 mm

N/A 90

N/A 319.20 mm

329.79 X 3.53 B-70

N/A
121063

N/A Metric Standard O-Ring

N/A Buna

N/A 279

N/A 3.53 mm

N/A 70

N/A 329.79 mm

329.79 X 3.53 B-90

N/A
121064

N/A Metric Standard O-Ring

N/A Buna

N/A 279

N/A 3.53 mm

N/A 90

N/A 329.79 mm

355.19 X 3.53 B-70

N/A
121065

N/A Metric Standard O-Ring

N/A Buna

N/A 280

N/A 3.53 mm

N/A 70

N/A 355.19 mm

355.19 X 3.53 B-90

N/A
121066

N/A Metric Standard O-Ring

N/A Buna

N/A 280

N/A 3.53 mm

N/A 90

N/A 355.19 mm

380.59 X 3.53 B-70

N/A
121067

N/A Metric Standard O-Ring

N/A Buna

N/A 281

N/A 3.53 mm

N/A 70

N/A 380.59 mm

380.59 X 3.53 B-90

N/A
121068

N/A Metric Standard O-Ring

N/A Buna

N/A 281

N/A 3.53 mm

N/A 90

N/A 380.59 mm

405.26 X 3.53 B-70

N/A
121069

N/A Metric Standard O-Ring

N/A Buna

N/A 282

N/A 3.53 mm

N/A 70

N/A 405.26 mm