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 | 
                        
                            Product Guides | 
                                                        
|---|---|---|---|---|---|---|---|---|---|
| BS448 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184468  | 
                                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 9.475 in240.67 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -448 | Product Guides N/A Seal Guides | 
| BS447 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184469  | 
                                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 8.975 in227.97 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -447 | Product Guides N/A Seal Guides | 
| BS447 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184470  | 
                                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 8.975 in227.97 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -447 | Product Guides N/A Seal Guides | 
| BS446 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184471  | 
                                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 8.475 in215.27 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -446 | Product Guides N/A Seal Guides | 
| BS446 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184472  | 
                                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 8.475 in215.27 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -446 | Product Guides N/A Seal Guides | 
| BS445 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184473  | 
                                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 7.975 in202.57 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -445 | Product Guides N/A Seal Guides | 
| BS445 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184474  | 
                                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 7.975 in202.57 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -445 | Product Guides N/A Seal Guides | 
| BS444 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184475  | 
                                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 7.725 in196.22 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -444 | Product Guides N/A Seal Guides | 
| BS444 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184476  | 
                                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 7.725 in196.22 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -444 | Product Guides N/A Seal Guides | 
| BS443 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184477  | 
                                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 7.475 in189.87 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -443 | Product Guides N/A Seal Guides | 
| BS443 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184478  | 
                                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 7.475 in189.87 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -443 | Product Guides N/A Seal Guides | 
| BS442 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184479  | 
                                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 7.225 in183.52 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -442 | Product Guides N/A Seal Guides | 
| BS442 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184480  | 
                                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 7.225 in183.52 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -442 | Product Guides N/A Seal Guides | 
| BS441 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184481  | 
                                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 6.975 in177.17 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -441 | Product Guides N/A Seal Guides | 
| BS441 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184482  | 
                                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 6.975 in177.17 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -441 | Product Guides N/A Seal Guides | 
| BS440 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184483  | 
                                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 6.725 in170.82 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -440 | Product Guides N/A Seal Guides | 
| BS440 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184484  | 
                                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 6.725 in170.82 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -440 | Product Guides N/A Seal Guides | 
| BS439 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184485  | 
                                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 6.475 in164.47 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -439 | Product Guides N/A Seal Guides | 
| BS439 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184486  | 
                                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 6.475 in164.47 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -439 | Product Guides N/A Seal Guides | 
| BS438 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184487  | 
                                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 6.225 in158.12 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -438 | Product Guides N/A Seal Guides | 
| BS438 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184488  | 
                                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 6.225 in158.12 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -438 | Product Guides N/A Seal Guides | 
| BS437 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184489  | 
                                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 5.975 in151.77 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -437 | Product Guides N/A Seal Guides | 
| BS437 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184490  | 
                                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 5.975 in151.77 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -437 | Product Guides N/A Seal Guides | 
| BS436 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184491  | 
                                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 5.850 in148.59 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -436 | Product Guides N/A Seal Guides | 
| BS436 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184492  | 
                                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 5.850 in148.59 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -436 | Product Guides N/A Seal Guides | 
 
