Metric Buna O-Rings

OneMonroe’s Metric Buna O-Rings are engineered to provide reliable sealing performance across a variety of industrial and commercial applications. Made from high-quality Buna-N (Nitrile) rubber, these O-rings are known for their excellent resistance to oils, fuels, and other petroleum-based products, making them ideal for use in environments where durable, leak-proof seals are essential. Buna-N’s resilient properties allow it to maintain its integrity even in challenging temperatures, ranging from -40°F to 250°F, ensuring these O-rings can withstand both low and high-stress conditions with ease. With a broad range of metric sizes available, OneMonroe ensures you’ll find the right fit for your exact specifications.

Our Metric Buna O-Rings are crafted to offer outstanding resistance to abrasion and tearing, providing long-lasting performance in rigorous applications. This makes them well-suited for automotive, aerospace, marine, and hydraulic systems, as well as in general maintenance and repair settings. The unique chemical composition of Buna-N allows these O-rings to endure pressure and friction over extended periods without compromising their sealing capabilities, making them a reliable choice for static and dynamic sealing tasks. Each O-ring is manufactured to precise industry standards, ensuring a dependable fit and function in every installation.

With OneMonroe, you’re getting more than just a product; you’re receiving a commitment to quality and expertise. Our team is dedicated to supporting your projects with high-quality metric Buna O-Rings that meet both industry standards and specific customer requirements. We provide technical support to help you select the best O-ring for your application, offering detailed product specifications and guidance. Trust OneMonroe to deliver durable, efficient, and cost-effective sealing solutions tailored to meet the demands of your unique projects.

For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.

Item #	IntegrationID	Type	Material	Cross Reference	Cross Section Width	Durometer	Inside Diameter
20.5 X 1 B-70	N/A 117171	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 20.50 mm
20.5 X 1 B-90	N/A 117172	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 20.50 mm
21 X 1 B-70	N/A 117173	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 21.00 mm
21 X 1 B-90	N/A 117174	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 21.00 mm
21.5 X 1 B-70	N/A 117175	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 21.50 mm
21.5 X 1 B-90	N/A 117176	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 21.50 mm
22 X 1 B-70	N/A 117177	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 22.00 mm
22 X 1 B-90	N/A 117178	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 22.00 mm
22.5 X 1 B-70	N/A 117179	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 22.50 mm
22.5 X 1 B-90	N/A 117180	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 22.50 mm
23.5 X 1 B-70	N/A 117181	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 23.50 mm
23.5 X 1 B-90	N/A 117182	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 23.50 mm
24 X 1 B-70	N/A 117183	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 24.00 mm
24 X 1 B-90	N/A 117184	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 24.00 mm
24.5 X 1 B-70	N/A 117185	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 24.50 mm
24.5 X 1 B-90	N/A 117186	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 24.50 mm
25 X 1 B-70	N/A 117187	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 25.00 mm
25 X 1 B-90	N/A 117188	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 25.00 mm
28 X 1 B-70	N/A 117189	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 28.00 mm
28 X 1 B-90	N/A 117190	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 28.00 mm
29.4 X 1 B-70	N/A 117191	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 29.40 mm
29.4 X 1 B-90	N/A 117192	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 29.40 mm
29.9 X 1 B-70	N/A 117193	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 29.90 mm
29.9 X 1 B-90	N/A 117194	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 90	N/A 29.90 mm
30.5 X 1 B-70	N/A 117195	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 1.00 mm	N/A 70	N/A 30.50 mm

N/A
117171

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 20.50 mm

20.5 X 1 B-90

N/A
117172

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 20.50 mm

21 X 1 B-70

N/A
117173

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 21.00 mm

21 X 1 B-90

N/A
117174

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 21.00 mm

21.5 X 1 B-70

N/A
117175

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 21.50 mm

21.5 X 1 B-90

N/A
117176

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 21.50 mm

22 X 1 B-70

N/A
117177

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 22.00 mm

22 X 1 B-90

N/A
117178

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 22.00 mm

22.5 X 1 B-70

N/A
117179

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 22.50 mm

22.5 X 1 B-90

N/A
117180

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 22.50 mm

23.5 X 1 B-70

N/A
117181

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 23.50 mm

23.5 X 1 B-90

N/A
117182

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 23.50 mm

24 X 1 B-70

N/A
117183

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 24.00 mm

24 X 1 B-90

N/A
117184

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 24.00 mm

24.5 X 1 B-70

N/A
117185

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 24.50 mm

24.5 X 1 B-90

N/A
117186

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 24.50 mm

25 X 1 B-70

N/A
117187

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 25.00 mm

25 X 1 B-90

N/A
117188

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 25.00 mm

28 X 1 B-70

N/A
117189

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 28.00 mm

28 X 1 B-90

N/A
117190

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 28.00 mm

29.4 X 1 B-70

N/A
117191

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 29.40 mm

29.4 X 1 B-90

N/A
117192

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 29.40 mm

29.9 X 1 B-70

N/A
117193

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 29.90 mm

29.9 X 1 B-90

N/A
117194

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 90

N/A 29.90 mm

30.5 X 1 B-70

N/A
117195

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 1.00 mm

N/A 70

N/A 30.50 mm