BS Buna O-Rings | OneMonroe

OneMonroe BUNA O-Rings are engineered to provide dependable sealing solutions for a wide range of industrial applications. Crafted from high-quality BUNA-N material, also known as Nitrile, these O-rings deliver exceptional resistance to oils, fuels, and various chemicals, making them a top choice for machinery, automotive, and hydraulic systems. Their robust design ensures a reliable seal in both low and high-pressure environments, protecting against leaks, contamination, and wear. Each O-ring is manufactured to precise industry standards, offering a secure fit and lasting performance that businesses can depend on in even the most demanding conditions.

Our selection of BUNA O-rings includes an extensive variety of sizes and specifications, designed to suit a wide array of sealing needs. From small to large diameters, OneMonroe provides O-rings that can be used across multiple industries, including aerospace, manufacturing, and construction. These O-rings are versatile, supporting applications that require excellent abrasion resistance and the ability to perform reliably in temperatures ranging from -40°F to 212°F. OneMonroe BUNA O-Rings are known for their compatibility with petroleum-based fluids and are often the go-to choice for applications involving oil and gas, where durability and flexibility are essential.

OneMonroe is dedicated to delivering high-quality, cost-effective solutions that meet the unique needs of its customers. Our BUNA O-rings undergo rigorous testing and quality control to ensure each product meets strict performance standards. Whether you’re in need of O-rings for maintenance, repair, or original equipment manufacturing, OneMonroe's BUNA O-rings provide a dependable, long-lasting solution. With a commitment to exceptional customer service, Monroe ensures you have access to the precise sealing products you need to keep your operations running smoothly.

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 Section Width	Durometer	Inside Diameter	CSW Tolerance	BS Number	Product Guides
BS279 B-70	N/A 184693	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 12.984 in329.79 mm	N/A 0.004 in0.10 mm	N/A -279	N/A Seal Guides
BS279 B-90	N/A 184694	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 12.984 in329.79 mm	N/A 0.004 in0.10 mm	N/A -279	N/A Seal Guides
BS278 B-70	N/A 184695	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 11.984 in304.39 mm	N/A 0.004 in0.10 mm	N/A -278	N/A Seal Guides
BS278 B-90	N/A 184696	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 11.984 in304.39 mm	N/A 0.004 in0.10 mm	N/A -278	N/A Seal Guides
BS277 B-70	N/A 184697	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 11.484 in291.69 mm	N/A 0.004 in0.10 mm	N/A -277	N/A Seal Guides
BS277 B-90	N/A 184698	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 11.484 in291.69 mm	N/A 0.004 in0.10 mm	N/A -277	N/A Seal Guides
BS276 B-70	N/A 184699	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 10.984 in278.99 mm	N/A 0.004 in0.10 mm	N/A -276	N/A Seal Guides
BS276 B-90	N/A 184700	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 10.984 in278.99 mm	N/A 0.004 in0.10 mm	N/A -276	N/A Seal Guides
BS275 B-70	N/A 184701	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 10.484 in266.29 mm	N/A 0.004 in0.10 mm	N/A -275	N/A Seal Guides
BS275 B-90	N/A 184702	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 10.484 in266.29 mm	N/A 0.004 in0.10 mm	N/A -275	N/A Seal Guides
BS274 B-70	N/A 184703	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 9.984 in253.59 mm	N/A 0.004 in0.10 mm	N/A -274	N/A Seal Guides
BS274 B-90	N/A 184704	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 9.984 in253.59 mm	N/A 0.004 in0.10 mm	N/A -274	N/A Seal Guides
BS273 B-70	N/A 184705	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 9.734 in247.24 mm	N/A 0.004 in0.10 mm	N/A -273	N/A Seal Guides
BS273 B-90	N/A 184706	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 9.734 in247.24 mm	N/A 0.004 in0.10 mm	N/A -273	N/A Seal Guides
BS272 B-70	N/A 184707	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 9.484 in240.89 mm	N/A 0.004 in0.10 mm	N/A -272	N/A Seal Guides
BS272 B-90	N/A 184708	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 9.484 in240.89 mm	N/A 0.004 in0.10 mm	N/A -272	N/A Seal Guides
BS271 B-70	N/A 184709	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 9.234 in234.54 mm	N/A 0.004 in0.10 mm	N/A -271	N/A Seal Guides
BS271 B-90	N/A 184710	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 9.234 in234.54 mm	N/A 0.004 in0.10 mm	N/A -271	N/A Seal Guides
BS270 B-70	N/A 184711	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 8.984 in228.19 mm	N/A 0.004 in0.10 mm	N/A -270	N/A Seal Guides
BS270 B-90	N/A 184712	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 8.984 in228.19 mm	N/A 0.004 in0.10 mm	N/A -270	N/A Seal Guides
BS269 B-70	N/A 184713	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 8.734 in221.84 mm	N/A 0.004 in0.10 mm	N/A -269	N/A Seal Guides
BS269 B-90	N/A 184714	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 8.734 in221.84 mm	N/A 0.004 in0.10 mm	N/A -269	N/A Seal Guides
BS268 B-70	N/A 184715	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 8.484 in215.49 mm	N/A 0.004 in0.10 mm	N/A -268	N/A Seal Guides
BS268 B-90	N/A 184716	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 90	N/A 8.484 in215.49 mm	N/A 0.004 in0.10 mm	N/A -268	N/A Seal Guides
BS267 B-70	N/A 184717	N/A BS Standard O-Ring	N/A Buna	N/A 0.139 in3.53 mm	N/A 70	N/A 8.234 in209.14 mm	N/A 0.004 in0.10 mm	N/A -267	N/A Seal Guides

N/A
184693

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 12.984 in329.79 mm

N/A 0.004 in0.10 mm

N/A -279

N/A Seal Guides

BS279 B-90

N/A
184694

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 12.984 in329.79 mm

N/A 0.004 in0.10 mm

N/A -279

N/A Seal Guides

BS278 B-70

N/A
184695

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 11.984 in304.39 mm

N/A 0.004 in0.10 mm

N/A -278

N/A Seal Guides

BS278 B-90

N/A
184696

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 11.984 in304.39 mm

N/A 0.004 in0.10 mm

N/A -278

N/A Seal Guides

BS277 B-70

N/A
184697

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 11.484 in291.69 mm

N/A 0.004 in0.10 mm

N/A -277

N/A Seal Guides

BS277 B-90

N/A
184698

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 11.484 in291.69 mm

N/A 0.004 in0.10 mm

N/A -277

N/A Seal Guides

BS276 B-70

N/A
184699

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 10.984 in278.99 mm

N/A 0.004 in0.10 mm

N/A -276

N/A Seal Guides

BS276 B-90

N/A
184700

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 10.984 in278.99 mm

N/A 0.004 in0.10 mm

N/A -276

N/A Seal Guides

BS275 B-70

N/A
184701

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 10.484 in266.29 mm

N/A 0.004 in0.10 mm

N/A -275

N/A Seal Guides

BS275 B-90

N/A
184702

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 10.484 in266.29 mm

N/A 0.004 in0.10 mm

N/A -275

N/A Seal Guides

BS274 B-70

N/A
184703

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 9.984 in253.59 mm

N/A 0.004 in0.10 mm

N/A -274

N/A Seal Guides

BS274 B-90

N/A
184704

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 9.984 in253.59 mm

N/A 0.004 in0.10 mm

N/A -274

N/A Seal Guides

BS273 B-70

N/A
184705

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 9.734 in247.24 mm

N/A 0.004 in0.10 mm

N/A -273

N/A Seal Guides

BS273 B-90

N/A
184706

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 9.734 in247.24 mm

N/A 0.004 in0.10 mm

N/A -273

N/A Seal Guides

BS272 B-70

N/A
184707

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 9.484 in240.89 mm

N/A 0.004 in0.10 mm

N/A -272

N/A Seal Guides

BS272 B-90

N/A
184708

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 9.484 in240.89 mm

N/A 0.004 in0.10 mm

N/A -272

N/A Seal Guides

BS271 B-70

N/A
184709

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 9.234 in234.54 mm

N/A 0.004 in0.10 mm

N/A -271

N/A Seal Guides

BS271 B-90

N/A
184710

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 9.234 in234.54 mm

N/A 0.004 in0.10 mm

N/A -271

N/A Seal Guides

BS270 B-70

N/A
184711

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 8.984 in228.19 mm

N/A 0.004 in0.10 mm

N/A -270

N/A Seal Guides

BS270 B-90

N/A
184712

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 8.984 in228.19 mm

N/A 0.004 in0.10 mm

N/A -270

N/A Seal Guides

BS269 B-70

N/A
184713

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 8.734 in221.84 mm

N/A 0.004 in0.10 mm

N/A -269

N/A Seal Guides

BS269 B-90

N/A
184714

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 8.734 in221.84 mm

N/A 0.004 in0.10 mm

N/A -269

N/A Seal Guides

BS268 B-70

N/A
184715

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 8.484 in215.49 mm

N/A 0.004 in0.10 mm

N/A -268

N/A Seal Guides

BS268 B-90

N/A
184716

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 90

N/A 8.484 in215.49 mm

N/A 0.004 in0.10 mm

N/A -268

N/A Seal Guides

BS267 B-70

N/A
184717

N/A BS Standard O-Ring

N/A Buna

N/A 0.139 in3.53 mm

N/A 70

N/A 8.234 in209.14 mm

N/A 0.004 in0.10 mm

N/A -267

N/A Seal Guides