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.
Cross Section Width (in)
Cross Section Width (mm)
Durometer
Inside Diameter (in)
Inside Diameter (mm)
Item # |
IntegrationID |
Type |
Material |
Cross Section Width |
Durometer |
Inside Diameter |
CSW Tolerance |
BS Number |
---|---|---|---|---|---|---|---|---|
BS643 B-90 |
IntegrationID
N/A 184318 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 3.299 in83.79 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -643 |
BS642 B-70 |
IntegrationID
N/A 184319 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 3.174 in80.62 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -642 |
BS642 B-90 |
IntegrationID
N/A 184320 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 3.174 in80.62 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -642 |
BS641 B-70 |
IntegrationID
N/A 184321 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 3.049 in77.44 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -641 |
BS641 B-90 |
IntegrationID
N/A 184322 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 3.049 in77.44 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -641 |
BS640 B-70 |
IntegrationID
N/A 184323 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 2.924 in74.27 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -640 |
BS640 B-90 |
IntegrationID
N/A 184324 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 2.924 in74.27 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -640 |
BS628 B-70 |
IntegrationID
N/A 184325 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 6.563 in166.70 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -628 |
BS628 B-90 |
IntegrationID
N/A 184326 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 6.563 in166.70 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -628 |
BS627 B-70 |
IntegrationID
N/A 184327 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 6.281 in159.54 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -627 |
BS627 B-90 |
IntegrationID
N/A 184328 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 6.281 in159.54 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -627 |
BS626 B-70 |
IntegrationID
N/A 184329 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 5.297 in134.54 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -626 |
BS626 B-90 |
IntegrationID
N/A 184330 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 5.297 in134.54 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -626 |
BS625 B-70 |
IntegrationID
N/A 184331 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 4.906 in124.61 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -625 |
BS625 B-90 |
IntegrationID
N/A 184332 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 4.906 in124.61 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -625 |
BS624 B-70 |
IntegrationID
N/A 184333 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 4.516 in114.71 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -624 |
BS624 B-90 |
IntegrationID
N/A 184334 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 4.516 in114.71 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -624 |
BS623 B-70 |
IntegrationID
N/A 184335 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 4.313 in109.54 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -623 |
BS623 B-90 |
IntegrationID
N/A 184336 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 90 | Inside Diameter N/A 4.313 in109.54 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -623 |
BS622 B-70 |
IntegrationID
N/A 184337 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 3.937 in100.00 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -622 |
BS622 B-90 |
IntegrationID
N/A 184338 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 90 | Inside Diameter N/A 3.937 in100.00 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -622 |
BS621 B-70 |
IntegrationID
N/A 184339 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 3.531 in89.69 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -621 |
BS621 B-90 |
IntegrationID
N/A 184340 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 90 | Inside Diameter N/A 3.531 in89.69 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -621 |
BS620 B-70 |
IntegrationID
N/A 184341 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 3.141 in79.78 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -620 |
BS620 B-90 |
IntegrationID
N/A 184342 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 90 | Inside Diameter N/A 3.141 in79.78 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -620 |