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
129.4 X 1.78 B-70	N/A 117771	N/A Metric Standard O-Ring	N/A Buna	N/A BS548	N/A 1.78 mm	N/A 70	N/A 129.40 mm
129.4 X 1.78 B-90	N/A 117772	N/A Metric Standard O-Ring	N/A Buna	N/A BS548	N/A 1.78 mm	N/A 90	N/A 129.40 mm
133.07 X 1.78 B-70	N/A 117773	N/A Metric Standard O-Ring	N/A Buna	N/A 50	N/A 1.78 mm	N/A 70	N/A 133.07 mm
133.07 X 1.78 B-90	N/A 117774	N/A Metric Standard O-Ring	N/A Buna	N/A 50	N/A 1.78 mm	N/A 90	N/A 133.07 mm
135.76 X 1.78 B-70	N/A 117775	N/A Metric Standard O-Ring	N/A Buna	N/A BS550	N/A 1.78 mm	N/A 70	N/A 135.76 mm
135.76 X 1.78 B-90	N/A 117776	N/A Metric Standard O-Ring	N/A Buna	N/A BS550	N/A 1.78 mm	N/A 90	N/A 135.76 mm
138.94 X 1.78 B-70	N/A 117777	N/A Metric Standard O-Ring	N/A Buna	N/A BS551	N/A 1.78 mm	N/A 70	N/A 138.94 mm
138.94 X 1.78 B-90	N/A 117778	N/A Metric Standard O-Ring	N/A Buna	N/A BS551	N/A 1.78 mm	N/A 90	N/A 138.94 mm
142.11 X 1.78 B-70	N/A 117779	N/A Metric Standard O-Ring	N/A Buna	N/A BS552	N/A 1.78 mm	N/A 70	N/A 142.11 mm
142.11 X 1.78 B-90	N/A 117780	N/A Metric Standard O-Ring	N/A Buna	N/A BS552	N/A 1.78 mm	N/A 90	N/A 142.11 mm
145.29 X 1.78 B-70	N/A 117781	N/A Metric Standard O-Ring	N/A Buna	N/A BS553	N/A 1.78 mm	N/A 70	N/A 145.29 mm
145.29 X 1.78 B-90	N/A 117782	N/A Metric Standard O-Ring	N/A Buna	N/A BS553	N/A 1.78 mm	N/A 90	N/A 145.29 mm
148.46 X 1.78 B-70	N/A 117783	N/A Metric Standard O-Ring	N/A Buna	N/A BS554	N/A 1.78 mm	N/A 70	N/A 148.46 mm
148.46 X 1.78 B-90	N/A 117784	N/A Metric Standard O-Ring	N/A Buna	N/A BS554	N/A 1.78 mm	N/A 90	N/A 148.46 mm
151.64 X 1.78 B-70	N/A 117785	N/A Metric Standard O-Ring	N/A Buna	N/A BS555	N/A 1.78 mm	N/A 70	N/A 151.64 mm
151.64 X 1.78 B-90	N/A 117786	N/A Metric Standard O-Ring	N/A Buna	N/A BS555	N/A 1.78 mm	N/A 90	N/A 151.64 mm
154.81 X 1.78 B-70	N/A 117787	N/A Metric Standard O-Ring	N/A Buna	N/A BS556	N/A 1.78 mm	N/A 70	N/A 154.81 mm
154.81 X 1.78 B-90	N/A 117788	N/A Metric Standard O-Ring	N/A Buna	N/A BS556	N/A 1.78 mm	N/A 90	N/A 154.81 mm
158 X 1.78 B-70	N/A 117789	N/A Metric Standard O-Ring	N/A Buna	N/A BS557	N/A 1.78 mm	N/A 70	N/A 158.00 mm
158 X 1.78 B-90	N/A 117790	N/A Metric Standard O-Ring	N/A Buna	N/A BS557	N/A 1.78 mm	N/A 90	N/A 158.00 mm
161.16 X 1.78 B-70	N/A 117791	N/A Metric Standard O-Ring	N/A Buna	N/A BS558	N/A 1.78 mm	N/A 70	N/A 161.16 mm
161.16 X 1.78 B-90	N/A 117792	N/A Metric Standard O-Ring	N/A Buna	N/A BS558	N/A 1.78 mm	N/A 90	N/A 161.16 mm
164.34 X 1.78 B-70	N/A 117793	N/A Metric Standard O-Ring	N/A Buna	N/A BS559	N/A 1.78 mm	N/A 70	N/A 164.34 mm
164.34 X 1.78 B-90	N/A 117794	N/A Metric Standard O-Ring	N/A Buna	N/A BS559	N/A 1.78 mm	N/A 90	N/A 164.34 mm
167.51 X 1.78 B-70	N/A 117795	N/A Metric Standard O-Ring	N/A Buna	N/A BS560	N/A 1.78 mm	N/A 70	N/A 167.51 mm

N/A
117771

N/A Metric Standard O-Ring

N/A Buna

N/A BS548

N/A 1.78 mm

N/A 70

N/A 129.40 mm

129.4 X 1.78 B-90

N/A
117772

N/A Metric Standard O-Ring

N/A Buna

N/A BS548

N/A 1.78 mm

N/A 90

N/A 129.40 mm

133.07 X 1.78 B-70

N/A
117773

N/A Metric Standard O-Ring

N/A Buna

N/A 50

N/A 1.78 mm

N/A 70

N/A 133.07 mm

133.07 X 1.78 B-90

N/A
117774

N/A Metric Standard O-Ring

N/A Buna

N/A 50

N/A 1.78 mm

N/A 90

N/A 133.07 mm

135.76 X 1.78 B-70

N/A
117775

N/A Metric Standard O-Ring

N/A Buna

N/A BS550

N/A 1.78 mm

N/A 70

N/A 135.76 mm

135.76 X 1.78 B-90

N/A
117776

N/A Metric Standard O-Ring

N/A Buna

N/A BS550

N/A 1.78 mm

N/A 90

N/A 135.76 mm

138.94 X 1.78 B-70

N/A
117777

N/A Metric Standard O-Ring

N/A Buna

N/A BS551

N/A 1.78 mm

N/A 70

N/A 138.94 mm

138.94 X 1.78 B-90

N/A
117778

N/A Metric Standard O-Ring

N/A Buna

N/A BS551

N/A 1.78 mm

N/A 90

N/A 138.94 mm

142.11 X 1.78 B-70

N/A
117779

N/A Metric Standard O-Ring

N/A Buna

N/A BS552

N/A 1.78 mm

N/A 70

N/A 142.11 mm

142.11 X 1.78 B-90

N/A
117780

N/A Metric Standard O-Ring

N/A Buna

N/A BS552

N/A 1.78 mm

N/A 90

N/A 142.11 mm

145.29 X 1.78 B-70

N/A
117781

N/A Metric Standard O-Ring

N/A Buna

N/A BS553

N/A 1.78 mm

N/A 70

N/A 145.29 mm

145.29 X 1.78 B-90

N/A
117782

N/A Metric Standard O-Ring

N/A Buna

N/A BS553

N/A 1.78 mm

N/A 90

N/A 145.29 mm

148.46 X 1.78 B-70

N/A
117783

N/A Metric Standard O-Ring

N/A Buna

N/A BS554

N/A 1.78 mm

N/A 70

N/A 148.46 mm

148.46 X 1.78 B-90

N/A
117784

N/A Metric Standard O-Ring

N/A Buna

N/A BS554

N/A 1.78 mm

N/A 90

N/A 148.46 mm

151.64 X 1.78 B-70

N/A
117785

N/A Metric Standard O-Ring

N/A Buna

N/A BS555

N/A 1.78 mm

N/A 70

N/A 151.64 mm

151.64 X 1.78 B-90

N/A
117786

N/A Metric Standard O-Ring

N/A Buna

N/A BS555

N/A 1.78 mm

N/A 90

N/A 151.64 mm

154.81 X 1.78 B-70

N/A
117787

N/A Metric Standard O-Ring

N/A Buna

N/A BS556

N/A 1.78 mm

N/A 70

N/A 154.81 mm

154.81 X 1.78 B-90

N/A
117788

N/A Metric Standard O-Ring

N/A Buna

N/A BS556

N/A 1.78 mm

N/A 90

N/A 154.81 mm

158 X 1.78 B-70

N/A
117789

N/A Metric Standard O-Ring

N/A Buna

N/A BS557

N/A 1.78 mm

N/A 70

N/A 158.00 mm

158 X 1.78 B-90

N/A
117790

N/A Metric Standard O-Ring

N/A Buna

N/A BS557

N/A 1.78 mm

N/A 90

N/A 158.00 mm

161.16 X 1.78 B-70

N/A
117791

N/A Metric Standard O-Ring

N/A Buna

N/A BS558

N/A 1.78 mm

N/A 70

N/A 161.16 mm

161.16 X 1.78 B-90

N/A
117792

N/A Metric Standard O-Ring

N/A Buna

N/A BS558

N/A 1.78 mm

N/A 90

N/A 161.16 mm

164.34 X 1.78 B-70

N/A
117793

N/A Metric Standard O-Ring

N/A Buna

N/A BS559

N/A 1.78 mm

N/A 70

N/A 164.34 mm

164.34 X 1.78 B-90

N/A
117794

N/A Metric Standard O-Ring

N/A Buna

N/A BS559

N/A 1.78 mm

N/A 90

N/A 164.34 mm

167.51 X 1.78 B-70

N/A
117795

N/A Metric Standard O-Ring

N/A Buna

N/A BS560

N/A 1.78 mm

N/A 70

N/A 167.51 mm