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 | 
                                                        
|---|---|---|---|---|---|---|---|---|---|
| BS435 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184493  | 
                                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 5.725 in145.42 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -435 | Product Guides N/A Seal Guides | 
| BS435 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184494  | 
                                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 5.725 in145.42 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -435 | Product Guides N/A Seal Guides | 
| BS434 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184495  | 
                                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 5.600 in142.24 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -434 | Product Guides N/A Seal Guides | 
| BS434 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184496  | 
                                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 5.600 in142.24 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -434 | Product Guides N/A Seal Guides | 
| BS433 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184497  | 
                                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 5.475 in139.07 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -433 | Product Guides N/A Seal Guides | 
| BS433 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184498  | 
                                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 5.475 in139.07 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -433 | Product Guides N/A Seal Guides | 
| BS432 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184499  | 
                                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 5.350 in135.89 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -432 | Product Guides N/A Seal Guides | 
| BS432 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184500  | 
                                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 5.350 in135.89 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -432 | Product Guides N/A Seal Guides | 
| BS431 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184501  | 
                                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 5.225 in132.72 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -431 | Product Guides N/A Seal Guides | 
| BS431 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184502  | 
                                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 5.225 in132.72 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -431 | Product Guides N/A Seal Guides | 
| BS430 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184503  | 
                                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 5.100 in129.54 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -430 | Product Guides N/A Seal Guides | 
| BS430 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184504  | 
                                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 5.100 in129.54 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -430 | Product Guides N/A Seal Guides | 
| BS429 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184505  | 
                                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 4.975 in126.37 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -429 | Product Guides N/A Seal Guides | 
| BS429 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184506  | 
                                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 4.975 in126.37 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -429 | Product Guides N/A Seal Guides | 
| BS428 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184507  | 
                                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 4.850 in123.19 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -428 | Product Guides N/A Seal Guides | 
| BS428 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184508  | 
                                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 4.850 in123.19 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -428 | Product Guides N/A Seal Guides | 
| BS427 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184509  | 
                                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 4.725 in120.02 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -427 | Product Guides N/A Seal Guides | 
| BS427 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184510  | 
                                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 4.725 in120.02 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -427 | Product Guides N/A Seal Guides | 
| BS426 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184511  | 
                                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 4.600 in116.84 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -426 | Product Guides N/A Seal Guides | 
| BS426 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184512  | 
                                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 4.600 in116.84 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -426 | Product Guides N/A Seal Guides | 
| BS425 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184513  | 
                                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 4.475 in113.67 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -425 | Product Guides N/A Seal Guides | 
| BS425 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184514  | 
                                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 4.475 in113.67 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -425 | Product Guides N/A Seal Guides | 
| BS395 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184515  | 
                                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 25.940 in658.88 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -395 | Product Guides N/A Seal Guides | 
| BS395 B-90 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184516  | 
                                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 25.940 in658.88 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -395 | Product Guides N/A Seal Guides | 
| BS394 B-70 | 
                                    
                                        IntegrationID                                                    
 N/A                                                         184517  | 
                                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 24.940 in633.48 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -394 | Product Guides N/A Seal Guides | 
 
