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
50.52 X 1.78 B-70	N/A 117721	N/A Metric Standard O-Ring	N/A Buna	N/A 33	N/A 1.78 mm	N/A 70	N/A 50.52 mm
50.52 X 1.78 B-90	N/A 117722	N/A Metric Standard O-Ring	N/A Buna	N/A 33	N/A 1.78 mm	N/A 90	N/A 50.52 mm
53.7 X 1.78 B-70	N/A 117723	N/A Metric Standard O-Ring	N/A Buna	N/A 34	N/A 1.78 mm	N/A 70	N/A 53.70 mm
53.7 X 1.78 B-90	N/A 117724	N/A Metric Standard O-Ring	N/A Buna	N/A 34	N/A 1.78 mm	N/A 90	N/A 53.70 mm
56.87 X 1.78 B-70	N/A 117725	N/A Metric Standard O-Ring	N/A Buna	N/A 35	N/A 1.78 mm	N/A 70	N/A 56.87 mm
56.87 X 1.78 B-90	N/A 117726	N/A Metric Standard O-Ring	N/A Buna	N/A 35	N/A 1.78 mm	N/A 90	N/A 56.87 mm
60.05 X 1.78 B-70	N/A 117727	N/A Metric Standard O-Ring	N/A Buna	N/A 36	N/A 1.78 mm	N/A 70	N/A 60.05 mm
60.05 X 1.78 B-90	N/A 117728	N/A Metric Standard O-Ring	N/A Buna	N/A 36	N/A 1.78 mm	N/A 90	N/A 60.05 mm
63.22 X 1.78 B-70	N/A 117729	N/A Metric Standard O-Ring	N/A Buna	N/A 37	N/A 1.78 mm	N/A 70	N/A 63.22 mm
63.22 X 1.78 B-90	N/A 117730	N/A Metric Standard O-Ring	N/A Buna	N/A 37	N/A 1.78 mm	N/A 90	N/A 63.22 mm
66.4 X 1.78 B-70	N/A 117731	N/A Metric Standard O-Ring	N/A Buna	N/A 38	N/A 1.78 mm	N/A 70	N/A 66.40 mm
66.4 X 1.78 B-90	N/A 117732	N/A Metric Standard O-Ring	N/A Buna	N/A 38	N/A 1.78 mm	N/A 90	N/A 66.40 mm
69.57 X 1.78 B-70	N/A 117733	N/A Metric Standard O-Ring	N/A Buna	N/A 39	N/A 1.78 mm	N/A 70	N/A 69.57 mm
69.57 X 1.78 B-90	N/A 117734	N/A Metric Standard O-Ring	N/A Buna	N/A 39	N/A 1.78 mm	N/A 90	N/A 69.57 mm
72.75 X 1.78 B-70	N/A 117735	N/A Metric Standard O-Ring	N/A Buna	N/A 40	N/A 1.78 mm	N/A 70	N/A 72.75 mm
72.75 X 1.78 B-90	N/A 117736	N/A Metric Standard O-Ring	N/A Buna	N/A 40	N/A 1.78 mm	N/A 90	N/A 72.75 mm
75.92 X 1.78 B-70	N/A 117737	N/A Metric Standard O-Ring	N/A Buna	N/A 41	N/A 1.78 mm	N/A 70	N/A 75.92 mm
75.92 X 1.78 B-90	N/A 117738	N/A Metric Standard O-Ring	N/A Buna	N/A 41	N/A 1.78 mm	N/A 90	N/A 75.92 mm
79 X 1.78 B-70	N/A 117739	N/A Metric Standard O-Ring	N/A Buna	N/A BS532	N/A 1.78 mm	N/A 70	N/A 79.00 mm
79 X 1.78 B-90	N/A 117740	N/A Metric Standard O-Ring	N/A Buna	N/A BS532	N/A 1.78 mm	N/A 90	N/A 79.00 mm
82.27 X 1.78 B-70	N/A 117741	N/A Metric Standard O-Ring	N/A Buna	N/A 42	N/A 1.78 mm	N/A 70	N/A 82.27 mm
82.27 X 1.78 B-90	N/A 117742	N/A Metric Standard O-Ring	N/A Buna	N/A 42	N/A 1.78 mm	N/A 90	N/A 82.27 mm
85.34 X 1.78 B-70	N/A 117743	N/A Metric Standard O-Ring	N/A Buna	N/A BS534	N/A 1.78 mm	N/A 70	N/A 85.34 mm
85.34 X 1.78 B-90	N/A 117744	N/A Metric Standard O-Ring	N/A Buna	N/A BS534	N/A 1.78 mm	N/A 90	N/A 85.34 mm
88.62 X 1.78 B-70	N/A 117745	N/A Metric Standard O-Ring	N/A Buna	N/A 43	N/A 1.78 mm	N/A 70	N/A 88.62 mm

N/A
117721

N/A Metric Standard O-Ring

N/A Buna

N/A 33

N/A 1.78 mm

N/A 70

N/A 50.52 mm

50.52 X 1.78 B-90

N/A
117722

N/A Metric Standard O-Ring

N/A Buna

N/A 33

N/A 1.78 mm

N/A 90

N/A 50.52 mm

53.7 X 1.78 B-70

N/A
117723

N/A Metric Standard O-Ring

N/A Buna

N/A 34

N/A 1.78 mm

N/A 70

N/A 53.70 mm

53.7 X 1.78 B-90

N/A
117724

N/A Metric Standard O-Ring

N/A Buna

N/A 34

N/A 1.78 mm

N/A 90

N/A 53.70 mm

56.87 X 1.78 B-70

N/A
117725

N/A Metric Standard O-Ring

N/A Buna

N/A 35

N/A 1.78 mm

N/A 70

N/A 56.87 mm

56.87 X 1.78 B-90

N/A
117726

N/A Metric Standard O-Ring

N/A Buna

N/A 35

N/A 1.78 mm

N/A 90

N/A 56.87 mm

60.05 X 1.78 B-70

N/A
117727

N/A Metric Standard O-Ring

N/A Buna

N/A 36

N/A 1.78 mm

N/A 70

N/A 60.05 mm

60.05 X 1.78 B-90

N/A
117728

N/A Metric Standard O-Ring

N/A Buna

N/A 36

N/A 1.78 mm

N/A 90

N/A 60.05 mm

63.22 X 1.78 B-70

N/A
117729

N/A Metric Standard O-Ring

N/A Buna

N/A 37

N/A 1.78 mm

N/A 70

N/A 63.22 mm

63.22 X 1.78 B-90

N/A
117730

N/A Metric Standard O-Ring

N/A Buna

N/A 37

N/A 1.78 mm

N/A 90

N/A 63.22 mm

66.4 X 1.78 B-70

N/A
117731

N/A Metric Standard O-Ring

N/A Buna

N/A 38

N/A 1.78 mm

N/A 70

N/A 66.40 mm

66.4 X 1.78 B-90

N/A
117732

N/A Metric Standard O-Ring

N/A Buna

N/A 38

N/A 1.78 mm

N/A 90

N/A 66.40 mm

69.57 X 1.78 B-70

N/A
117733

N/A Metric Standard O-Ring

N/A Buna

N/A 39

N/A 1.78 mm

N/A 70

N/A 69.57 mm

69.57 X 1.78 B-90

N/A
117734

N/A Metric Standard O-Ring

N/A Buna

N/A 39

N/A 1.78 mm

N/A 90

N/A 69.57 mm

72.75 X 1.78 B-70

N/A
117735

N/A Metric Standard O-Ring

N/A Buna

N/A 40

N/A 1.78 mm

N/A 70

N/A 72.75 mm

72.75 X 1.78 B-90

N/A
117736

N/A Metric Standard O-Ring

N/A Buna

N/A 40

N/A 1.78 mm

N/A 90

N/A 72.75 mm

75.92 X 1.78 B-70

N/A
117737

N/A Metric Standard O-Ring

N/A Buna

N/A 41

N/A 1.78 mm

N/A 70

N/A 75.92 mm

75.92 X 1.78 B-90

N/A
117738

N/A Metric Standard O-Ring

N/A Buna

N/A 41

N/A 1.78 mm

N/A 90

N/A 75.92 mm

79 X 1.78 B-70

N/A
117739

N/A Metric Standard O-Ring

N/A Buna

N/A BS532

N/A 1.78 mm

N/A 70

N/A 79.00 mm

79 X 1.78 B-90

N/A
117740

N/A Metric Standard O-Ring

N/A Buna

N/A BS532

N/A 1.78 mm

N/A 90

N/A 79.00 mm

82.27 X 1.78 B-70

N/A
117741

N/A Metric Standard O-Ring

N/A Buna

N/A 42

N/A 1.78 mm

N/A 70

N/A 82.27 mm

82.27 X 1.78 B-90

N/A
117742

N/A Metric Standard O-Ring

N/A Buna

N/A 42

N/A 1.78 mm

N/A 90

N/A 82.27 mm

85.34 X 1.78 B-70

N/A
117743

N/A Metric Standard O-Ring

N/A Buna

N/A BS534

N/A 1.78 mm

N/A 70

N/A 85.34 mm

85.34 X 1.78 B-90

N/A
117744

N/A Metric Standard O-Ring

N/A Buna

N/A BS534

N/A 1.78 mm

N/A 90

N/A 85.34 mm

88.62 X 1.78 B-70

N/A
117745

N/A Metric Standard O-Ring

N/A Buna

N/A 43

N/A 1.78 mm

N/A 70

N/A 88.62 mm