Monroe
OneMonroe
Locations Throughout the Country
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Tel: (877) 740-2007
Fax: (800) 453-9683
Email: sales@askmonroe.com
Website: monroeengineering.com
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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.

BS O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

BS Number

Quantity
BS435 B-70 N/A
184493 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.725 in145.42 mm N/A 0.006 in0.15 mm N/A -435
BS435 B-90 N/A
184494 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.725 in145.42 mm N/A 0.006 in0.15 mm N/A -435
BS434 B-70 N/A
184495 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.600 in142.24 mm N/A 0.006 in0.15 mm N/A -434
BS434 B-90 N/A
184496 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.600 in142.24 mm N/A 0.006 in0.15 mm N/A -434
BS433 B-70 N/A
184497 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.475 in139.07 mm N/A 0.006 in0.15 mm N/A -433
BS433 B-90 N/A
184498 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.475 in139.07 mm N/A 0.006 in0.15 mm N/A -433
BS432 B-70 N/A
184499 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.350 in135.89 mm N/A 0.006 in0.15 mm N/A -432
BS432 B-90 N/A
184500 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.350 in135.89 mm N/A 0.006 in0.15 mm N/A -432
BS431 B-70 N/A
184501 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.225 in132.72 mm N/A 0.006 in0.15 mm N/A -431
BS431 B-90 N/A
184502 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.225 in132.72 mm N/A 0.006 in0.15 mm N/A -431
BS430 B-70 N/A
184503 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.100 in129.54 mm N/A 0.006 in0.15 mm N/A -430
BS430 B-90 N/A
184504 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.100 in129.54 mm N/A 0.006 in0.15 mm N/A -430
BS429 B-70 N/A
184505 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.975 in126.37 mm N/A 0.006 in0.15 mm N/A -429
BS429 B-90 N/A
184506 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.975 in126.37 mm N/A 0.006 in0.15 mm N/A -429
BS428 B-70 N/A
184507 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.850 in123.19 mm N/A 0.006 in0.15 mm N/A -428
BS428 B-90 N/A
184508 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.850 in123.19 mm N/A 0.006 in0.15 mm N/A -428
BS427 B-70 N/A
184509 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.725 in120.02 mm N/A 0.006 in0.15 mm N/A -427
BS427 B-90 N/A
184510 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.725 in120.02 mm N/A 0.006 in0.15 mm N/A -427
BS426 B-70 N/A
184511 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.600 in116.84 mm N/A 0.006 in0.15 mm N/A -426
BS426 B-90 N/A
184512 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.600 in116.84 mm N/A 0.006 in0.15 mm N/A -426
BS425 B-70 N/A
184513 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.475 in113.67 mm N/A 0.006 in0.15 mm N/A -425
BS425 B-90 N/A
184514 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.475 in113.67 mm N/A 0.006 in0.15 mm N/A -425
BS395 B-70 N/A
184515 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 25.940 in658.88 mm N/A 0.005 in0.13 mm N/A -395
BS395 B-90 N/A
184516 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 25.940 in658.88 mm N/A 0.005 in0.13 mm N/A -395
BS394 B-70 N/A
184517 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 24.940 in633.48 mm N/A 0.005 in0.13 mm N/A -394
Unit of Measure
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