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 | 
                                                        
|---|---|---|---|---|---|---|---|---|---|
| BS381 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184543  | 
                                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 11.975 in304.17 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -381 | Product Guides N/A Seal Guides | 
| BS381 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184544  | 
                                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 11.975 in304.17 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -381 | Product Guides N/A Seal Guides | 
| BS380 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184545  | 
                                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 11.475 in291.47 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -380 | Product Guides N/A Seal Guides | 
| BS380 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184546  | 
                                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 11.475 in291.47 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -380 | Product Guides N/A Seal Guides | 
| BS379 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184547  | 
                                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 10.975 in278.77 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -379 | Product Guides N/A Seal Guides | 
| BS379 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184548  | 
                                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 10.975 in278.77 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -379 | Product Guides N/A Seal Guides | 
| BS378 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184549  | 
                                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 10.475 in266.07 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -378 | Product Guides N/A Seal Guides | 
| BS378 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184550  | 
                                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 10.475 in266.07 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -378 | Product Guides N/A Seal Guides | 
| BS377 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184551  | 
                                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 9.975 in253.37 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -377 | Product Guides N/A Seal Guides | 
| BS377 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184552  | 
                                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 9.975 in253.37 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -377 | Product Guides N/A Seal Guides | 
| BS376 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184553  | 
                                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 9.725 in247.02 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -376 | Product Guides N/A Seal Guides | 
| BS376 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184554  | 
                                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 9.725 in247.02 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -376 | Product Guides N/A Seal Guides | 
| BS375 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184555  | 
                                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 9.475 in240.67 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -375 | Product Guides N/A Seal Guides | 
| BS375 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184556  | 
                                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 9.475 in240.67 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -375 | Product Guides N/A Seal Guides | 
| BS374 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184557  | 
                                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 9.225 in234.32 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -374 | Product Guides N/A Seal Guides | 
| BS374 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184558  | 
                                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 9.225 in234.32 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -374 | Product Guides N/A Seal Guides | 
| BS373 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184559  | 
                                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 8.975 in227.97 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -373 | Product Guides N/A Seal Guides | 
| BS373 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184560  | 
                                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 8.975 in227.97 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -373 | Product Guides N/A Seal Guides | 
| BS372 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184561  | 
                                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 8.725 in221.62 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -372 | Product Guides N/A Seal Guides | 
| BS372 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184562  | 
                                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 8.725 in221.62 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -372 | Product Guides N/A Seal Guides | 
| BS371 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184563  | 
                                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 8.475 in215.27 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -371 | Product Guides N/A Seal Guides | 
| BS371 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184564  | 
                                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 8.475 in215.27 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -371 | Product Guides N/A Seal Guides | 
| BS370 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184565  | 
                                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 8.225 in208.92 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -370 | Product Guides N/A Seal Guides | 
| BS370 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184566  | 
                                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 8.225 in208.92 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -370 | Product Guides N/A Seal Guides | 
| BS369 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184567  | 
                                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 7.975 in202.57 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -369 | Product Guides N/A Seal Guides | 
 
