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
24.7 X 3.5 B-90	N/A 119968	N/A Metric Standard O-Ring	N/A Buna	N/A P25	N/A 3.50 mm	N/A 90	N/A 24.70 mm
25x3.50B70	N/A 119969	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 70	N/A 25.00 mm
25 X 3.5 B-90	N/A 119970	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 90	N/A 25.00 mm
25.2x3.50B70	N/A 119971	N/A Metric Standard O-Ring	N/A Buna	N/A P25.5	N/A 3.50 mm	N/A 70	N/A 25.20 mm
25.2 X 3.5 B-90	N/A 119972	N/A Metric Standard O-Ring	N/A Buna	N/A P25.5	N/A 3.50 mm	N/A 90	N/A 25.20 mm
25.7x3.50B70	N/A 119973	N/A Metric Standard O-Ring	N/A Buna	N/A P26	N/A 3.50 mm	N/A 70	N/A 25.70 mm
25.7 X 3.5 B-90	N/A 119974	N/A Metric Standard O-Ring	N/A Buna	N/A P26	N/A 3.50 mm	N/A 90	N/A 25.70 mm
26x3.50B70	N/A 119975	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 70	N/A 26.00 mm
26 X 3.5 B-90	N/A 119976	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 90	N/A 26.00 mm
27x3.50B70	N/A 119977	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 70	N/A 27.00 mm
27 X 3.5 B-90	N/A 119978	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 90	N/A 27.00 mm
27.7x3.50B70	N/A 119979	N/A Metric Standard O-Ring	N/A Buna	N/A P28	N/A 3.50 mm	N/A 70	N/A 27.70 mm
27.7 X 3.5 B-90	N/A 119980	N/A Metric Standard O-Ring	N/A Buna	N/A P28	N/A 3.50 mm	N/A 90	N/A 27.70 mm
28x3.50B70	N/A 119981	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 70	N/A 28.00 mm
28 X 3.5 B-90	N/A 119982	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 90	N/A 28.00 mm
28.7x3.50B70	N/A 119983	N/A Metric Standard O-Ring	N/A Buna	N/A P29	N/A 3.50 mm	N/A 70	N/A 28.70 mm
28.7 X 3.5 B-90	N/A 119984	N/A Metric Standard O-Ring	N/A Buna	N/A P29	N/A 3.50 mm	N/A 90	N/A 28.70 mm
29x3.50B70	N/A 119985	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 70	N/A 29.00 mm
29 X 3.5 B-90	N/A 119986	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 90	N/A 29.00 mm
29.2 X 3.5 B-70	N/A 119987	N/A Metric Standard O-Ring	N/A Buna	N/A P29.5	N/A 3.50 mm	N/A 70	N/A 29.20 mm
29.2 X 3.5 B-90	N/A 119988	N/A Metric Standard O-Ring	N/A Buna	N/A P29.5	N/A 3.50 mm	N/A 90	N/A 29.20 mm
29.7x3.50B70	N/A 119989	N/A Metric Standard O-Ring	N/A Buna	N/A P30	N/A 3.50 mm	N/A 70	N/A 29.70 mm
29.7 X 3.5 B-90	N/A 119990	N/A Metric Standard O-Ring	N/A Buna	N/A P30	N/A 3.50 mm	N/A 90	N/A 29.70 mm
30x3.50B70	N/A 119991	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 70	N/A 30.00 mm
30 X 3.5 B-90	N/A 119992	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 3.50 mm	N/A 90	N/A 30.00 mm

N/A
119968

N/A Metric Standard O-Ring

N/A Buna

N/A P25

N/A 3.50 mm

N/A 90

N/A 24.70 mm

25x3.50B70

N/A
119969

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 70

N/A 25.00 mm

25 X 3.5 B-90

N/A
119970

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 90

N/A 25.00 mm

25.2x3.50B70

N/A
119971

N/A Metric Standard O-Ring

N/A Buna

N/A P25.5

N/A 3.50 mm

N/A 70

N/A 25.20 mm

25.2 X 3.5 B-90

N/A
119972

N/A Metric Standard O-Ring

N/A Buna

N/A P25.5

N/A 3.50 mm

N/A 90

N/A 25.20 mm

25.7x3.50B70

N/A
119973

N/A Metric Standard O-Ring

N/A Buna

N/A P26

N/A 3.50 mm

N/A 70

N/A 25.70 mm

25.7 X 3.5 B-90

N/A
119974

N/A Metric Standard O-Ring

N/A Buna

N/A P26

N/A 3.50 mm

N/A 90

N/A 25.70 mm

26x3.50B70

N/A
119975

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 70

N/A 26.00 mm

26 X 3.5 B-90

N/A
119976

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 90

N/A 26.00 mm

27x3.50B70

N/A
119977

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 70

N/A 27.00 mm

27 X 3.5 B-90

N/A
119978

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 90

N/A 27.00 mm

27.7x3.50B70

N/A
119979

N/A Metric Standard O-Ring

N/A Buna

N/A P28

N/A 3.50 mm

N/A 70

N/A 27.70 mm

27.7 X 3.5 B-90

N/A
119980

N/A Metric Standard O-Ring

N/A Buna

N/A P28

N/A 3.50 mm

N/A 90

N/A 27.70 mm

28x3.50B70

N/A
119981

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 70

N/A 28.00 mm

28 X 3.5 B-90

N/A
119982

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 90

N/A 28.00 mm

28.7x3.50B70

N/A
119983

N/A Metric Standard O-Ring

N/A Buna

N/A P29

N/A 3.50 mm

N/A 70

N/A 28.70 mm

28.7 X 3.5 B-90

N/A
119984

N/A Metric Standard O-Ring

N/A Buna

N/A P29

N/A 3.50 mm

N/A 90

N/A 28.70 mm

29x3.50B70

N/A
119985

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 70

N/A 29.00 mm

29 X 3.5 B-90

N/A
119986

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 90

N/A 29.00 mm

29.2 X 3.5 B-70

N/A
119987

N/A Metric Standard O-Ring

N/A Buna

N/A P29.5

N/A 3.50 mm

N/A 70

N/A 29.20 mm

29.2 X 3.5 B-90

N/A
119988

N/A Metric Standard O-Ring

N/A Buna

N/A P29.5

N/A 3.50 mm

N/A 90

N/A 29.20 mm

29.7x3.50B70

N/A
119989

N/A Metric Standard O-Ring

N/A Buna

N/A P30

N/A 3.50 mm

N/A 70

N/A 29.70 mm

29.7 X 3.5 B-90

N/A
119990

N/A Metric Standard O-Ring

N/A Buna

N/A P30

N/A 3.50 mm

N/A 90

N/A 29.70 mm

30x3.50B70

N/A
119991

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 70

N/A 30.00 mm

30 X 3.5 B-90

N/A
119992

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 3.50 mm

N/A 90

N/A 30.00 mm