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	Product Guides
117x4.00B70	N/A 121497	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 117.00 mm	N/A Seal Guides
117 X 4 B-90	N/A 121498	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 117.00 mm	N/A Seal Guides
118x4.00B70	N/A 121499	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 118.00 mm	N/A Seal Guides
118 X 4 B-90	N/A 121500	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 118.00 mm	N/A Seal Guides
119x4.00B70	N/A 121501	N/A Metric Standard O-Ring	N/A Buna	N/A V120	N/A 4.00 mm	N/A 70	N/A 119.00 mm	N/A Seal Guides
119 X 4 B-90	N/A 121502	N/A Metric Standard O-Ring	N/A Buna	N/A V120	N/A 4.00 mm	N/A 90	N/A 119.00 mm	N/A Seal Guides
120x4.00B70	N/A 121503	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 120.00 mm	N/A Seal Guides
120 X 4 B-90	N/A 121504	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 120.00 mm	N/A Seal Guides
121x4.00B70	N/A 121505	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 121.00 mm	N/A Seal Guides
121 X 4 B-90	N/A 121506	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 121.00 mm	N/A Seal Guides
122x4.00B70	N/A 121507	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 122.00 mm	N/A Seal Guides
122 X 4 B-90	N/A 121508	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 122.00 mm	N/A Seal Guides
123x4.00B70	N/A 121509	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 123.00 mm	N/A Seal Guides
123 X 4 B-90	N/A 121510	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 123.00 mm	N/A Seal Guides
124x4.00B70	N/A 121511	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 124.00 mm	N/A Seal Guides
124 X 4 B-90	N/A 121512	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 124.00 mm	N/A Seal Guides
125x4.00B70	N/A 121513	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 125.00 mm	N/A Seal Guides
125 X 4 B-90	N/A 121514	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 125.00 mm	N/A Seal Guides
126x4.00B70	N/A 121515	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 126.00 mm	N/A Seal Guides
126 X 4 B-90	N/A 121516	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 126.00 mm	N/A Seal Guides
127x4.00B70	N/A 121517	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 127.00 mm	N/A Seal Guides
127 X 4 B-90	N/A 121518	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 127.00 mm	N/A Seal Guides
128x4.00B70	N/A 121519	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 128.00 mm	N/A Seal Guides
128 X 4 B-90	N/A 121520	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 128.00 mm	N/A Seal Guides
129x4.00B70	N/A 121521	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 129.00 mm	N/A Seal Guides

N/A
121497

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 117.00 mm

N/A Seal Guides

117 X 4 B-90

N/A
121498

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 117.00 mm

N/A Seal Guides

118x4.00B70

N/A
121499

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 118.00 mm

N/A Seal Guides

118 X 4 B-90

N/A
121500

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 118.00 mm

N/A Seal Guides

119x4.00B70

N/A
121501

N/A Metric Standard O-Ring

N/A Buna

N/A V120

N/A 4.00 mm

N/A 70

N/A 119.00 mm

N/A Seal Guides

119 X 4 B-90

N/A
121502

N/A Metric Standard O-Ring

N/A Buna

N/A V120

N/A 4.00 mm

N/A 90

N/A 119.00 mm

N/A Seal Guides

120x4.00B70

N/A
121503

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 120.00 mm

N/A Seal Guides

120 X 4 B-90

N/A
121504

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 120.00 mm

N/A Seal Guides

121x4.00B70

N/A
121505

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 121.00 mm

N/A Seal Guides

121 X 4 B-90

N/A
121506

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 121.00 mm

N/A Seal Guides

122x4.00B70

N/A
121507

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 122.00 mm

N/A Seal Guides

122 X 4 B-90

N/A
121508

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 122.00 mm

N/A Seal Guides

123x4.00B70

N/A
121509

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 123.00 mm

N/A Seal Guides

123 X 4 B-90

N/A
121510

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 123.00 mm

N/A Seal Guides

124x4.00B70

N/A
121511

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 124.00 mm

N/A Seal Guides

124 X 4 B-90

N/A
121512

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 124.00 mm

N/A Seal Guides

125x4.00B70

N/A
121513

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 125.00 mm

N/A Seal Guides

125 X 4 B-90

N/A
121514

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 125.00 mm

N/A Seal Guides

126x4.00B70

N/A
121515

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 126.00 mm

N/A Seal Guides

126 X 4 B-90

N/A
121516

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 126.00 mm

N/A Seal Guides

127x4.00B70

N/A
121517

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 127.00 mm

N/A Seal Guides

127 X 4 B-90

N/A
121518

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 127.00 mm

N/A Seal Guides

128x4.00B70

N/A
121519

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 128.00 mm

N/A Seal Guides

128 X 4 B-90

N/A
121520

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 128.00 mm

N/A Seal Guides

129x4.00B70

N/A
121521

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 129.00 mm

N/A Seal Guides