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
BS254 B-70 N/A
184743 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 5.484 in139.29 mm N/A 0.004 in0.10 mm N/A -254
BS254 B-90 N/A
184744 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 5.484 in139.29 mm N/A 0.004 in0.10 mm N/A -254
BS253 B-70 N/A
184745 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 5.359 in136.12 mm N/A 0.004 in0.10 mm N/A -253
BS253 B-90 N/A
184746 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 5.359 in136.12 mm N/A 0.004 in0.10 mm N/A -253
BS252 B-70 N/A
184747 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 5.234 in132.94 mm N/A 0.004 in0.10 mm N/A -252
BS252 B-90 N/A
184748 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 5.234 in132.94 mm N/A 0.004 in0.10 mm N/A -252
BS251 B-70 N/A
184749 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 5.109 in129.77 mm N/A 0.004 in0.10 mm N/A -251
BS251 B-90 N/A
184750 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 5.109 in129.77 mm N/A 0.004 in0.10 mm N/A -251
BS250 B-70 N/A
184751 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.984 in126.59 mm N/A 0.004 in0.10 mm N/A -250
BS250 B-90 N/A
184752 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.984 in126.59 mm N/A 0.004 in0.10 mm N/A -250
BS249 B-70 N/A
184753 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.859 in123.42 mm N/A 0.004 in0.10 mm N/A -249
BS249 B-90 N/A
184754 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.859 in123.42 mm N/A 0.004 in0.10 mm N/A -249
BS248 B-70 N/A
184755 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.734 in120.24 mm N/A 0.004 in0.10 mm N/A -248
BS248 B-90 N/A
184756 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.734 in120.24 mm N/A 0.004 in0.10 mm N/A -248
BS247 B-70 N/A
184757 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.609 in117.07 mm N/A 0.004 in0.10 mm N/A -247
BS247 B-90 N/A
184758 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.609 in117.07 mm N/A 0.004 in0.10 mm N/A -247
BS246 B-70 N/A
184759 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.484 in113.89 mm N/A 0.004 in0.10 mm N/A -246
BS246 B-90 N/A
184760 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.484 in113.89 mm N/A 0.004 in0.10 mm N/A -246
BS245 B-70 N/A
184761 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.359 in110.72 mm N/A 0.004 in0.10 mm N/A -245
BS245 B-90 N/A
184762 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.359 in110.72 mm N/A 0.004 in0.10 mm N/A -245
BS244 B-70 N/A
184763 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.234 in107.54 mm N/A 0.004 in0.10 mm N/A -244
BS244 B-90 N/A
184764 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.234 in107.54 mm N/A 0.004 in0.10 mm N/A -244
BS243 B-70 N/A
184765 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 4.109 in104.37 mm N/A 0.004 in0.10 mm N/A -243
BS243 B-90 N/A
184766 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 90 N/A 4.109 in104.37 mm N/A 0.004 in0.10 mm N/A -243
BS242 B-70 N/A
184767 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 3.984 in101.19 mm N/A 0.004 in0.10 mm N/A -242
Unit of Measure
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