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
35 X 2 B-90	N/A 118050	N/A Metric Standard O-Ring	N/A Buna	N/A S35.5	N/A 2.00 mm	N/A 90	N/A 35.00 mm
36.5x2.00B70	N/A 118051	N/A Metric Standard O-Ring	N/A Buna	N/A S36	N/A 2.00 mm	N/A 70	N/A 36.50 mm
36.5 X 2 B-90	N/A 118052	N/A Metric Standard O-Ring	N/A Buna	N/A S36	N/A 2.00 mm	N/A 90	N/A 36.50 mm
36x2.00B70	N/A 118053	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 36.00 mm
36 X 2 B-90	N/A 118054	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 36.00 mm
37x2.00B70	N/A 118057	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 37.00 mm
37 X 2 B-90	N/A 118058	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 37.00 mm
37.5x2.00B70	N/A 118059	N/A Metric Standard O-Ring	N/A Buna	N/A S38	N/A 2.00 mm	N/A 70	N/A 37.50 mm
37.5 X 2 B-90	N/A 118060	N/A Metric Standard O-Ring	N/A Buna	N/A S38	N/A 2.00 mm	N/A 90	N/A 37.50 mm
38x2.00B70	N/A 118061	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 38.00 mm
38 X 2 B-90	N/A 118062	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 38.00 mm
38.5x2.00B70	N/A 118063	N/A Metric Standard O-Ring	N/A Buna	N/A S39	N/A 2.00 mm	N/A 70	N/A 38.50 mm
38.5 X 2 B-90	N/A 118064	N/A Metric Standard O-Ring	N/A Buna	N/A S39	N/A 2.00 mm	N/A 90	N/A 38.50 mm
39x2.00B70	N/A 118065	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 39.00 mm
39 X 2 B-90	N/A 118066	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 39.00 mm
39.5x2.00B70	N/A 118067	N/A Metric Standard O-Ring	N/A Buna	N/A S40	N/A 2.00 mm	N/A 70	N/A 39.50 mm
39.5 X 2 B-90	N/A 118068	N/A Metric Standard O-Ring	N/A Buna	N/A S40	N/A 2.00 mm	N/A 90	N/A 39.50 mm
40x2.00B70	N/A 118069	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 40.00 mm
40 X 2 B-90	N/A 118070	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 40.00 mm
41x2.00B70	N/A 118071	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 41.00 mm
41 X 2 B-90	N/A 118072	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 41.00 mm
41.5x3.00B70	N/A 118073	N/A Metric Standard O-Ring	N/A Buna	N/A S42	N/A 2.00 mm	N/A 70	N/A 41.50 mm
41.5 X 2 B-90	N/A 118074	N/A Metric Standard O-Ring	N/A Buna	N/A S42	N/A 2.00 mm	N/A 90	N/A 41.50 mm
42x2.00B70	N/A 118075	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 70	N/A 42.00 mm
42 X 2 B-90	N/A 118076	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 2.00 mm	N/A 90	N/A 42.00 mm

N/A
118050

N/A Metric Standard O-Ring

N/A Buna

N/A S35.5

N/A 2.00 mm

N/A 90

N/A 35.00 mm

36.5x2.00B70

N/A
118051

N/A Metric Standard O-Ring

N/A Buna

N/A S36

N/A 2.00 mm

N/A 70

N/A 36.50 mm

36.5 X 2 B-90

N/A
118052

N/A Metric Standard O-Ring

N/A Buna

N/A S36

N/A 2.00 mm

N/A 90

N/A 36.50 mm

36x2.00B70

N/A
118053

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 36.00 mm

36 X 2 B-90

N/A
118054

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 36.00 mm

37x2.00B70

N/A
118057

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 37.00 mm

37 X 2 B-90

N/A
118058

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 37.00 mm

37.5x2.00B70

N/A
118059

N/A Metric Standard O-Ring

N/A Buna

N/A S38

N/A 2.00 mm

N/A 70

N/A 37.50 mm

37.5 X 2 B-90

N/A
118060

N/A Metric Standard O-Ring

N/A Buna

N/A S38

N/A 2.00 mm

N/A 90

N/A 37.50 mm

38x2.00B70

N/A
118061

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 38.00 mm

38 X 2 B-90

N/A
118062

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 38.00 mm

38.5x2.00B70

N/A
118063

N/A Metric Standard O-Ring

N/A Buna

N/A S39

N/A 2.00 mm

N/A 70

N/A 38.50 mm

38.5 X 2 B-90

N/A
118064

N/A Metric Standard O-Ring

N/A Buna

N/A S39

N/A 2.00 mm

N/A 90

N/A 38.50 mm

39x2.00B70

N/A
118065

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 39.00 mm

39 X 2 B-90

N/A
118066

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 39.00 mm

39.5x2.00B70

N/A
118067

N/A Metric Standard O-Ring

N/A Buna

N/A S40

N/A 2.00 mm

N/A 70

N/A 39.50 mm

39.5 X 2 B-90

N/A
118068

N/A Metric Standard O-Ring

N/A Buna

N/A S40

N/A 2.00 mm

N/A 90

N/A 39.50 mm

40x2.00B70

N/A
118069

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 40.00 mm

40 X 2 B-90

N/A
118070

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 40.00 mm

41x2.00B70

N/A
118071

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 41.00 mm

41 X 2 B-90

N/A
118072

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 41.00 mm

41.5x3.00B70

N/A
118073

N/A Metric Standard O-Ring

N/A Buna

N/A S42

N/A 2.00 mm

N/A 70

N/A 41.50 mm

41.5 X 2 B-90

N/A
118074

N/A Metric Standard O-Ring

N/A Buna

N/A S42

N/A 2.00 mm

N/A 90

N/A 41.50 mm

42x2.00B70

N/A
118075

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 70

N/A 42.00 mm

42 X 2 B-90

N/A
118076

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 2.00 mm

N/A 90

N/A 42.00 mm