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
100.5 X 4.5 B-70	N/A 122451	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 100.50 mm	N/A Seal Guides
100.5 X 4.5 B-90	N/A 122452	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 100.50 mm	N/A Seal Guides
101 X 4.5 B-70	N/A 122453	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 101.00 mm	N/A Seal Guides
101 X 4.5 B-90	N/A 122454	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 101.00 mm	N/A Seal Guides
103.5 X 4.5 B-70	N/A 122455	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 103.50 mm	N/A Seal Guides
103.5 X 4.5 B-90	N/A 122456	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 103.50 mm	N/A Seal Guides
105 X 4.5 B-70	N/A 122457	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 105.00 mm	N/A Seal Guides
105 X 4.5 B-90	N/A 122458	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 105.00 mm	N/A Seal Guides
106 X 4.5 B-70	N/A 122459	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 106.00 mm	N/A Seal Guides
106 X 4.5 B-90	N/A 122460	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 106.00 mm	N/A Seal Guides
110 X 4.5 B-70	N/A 122461	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 110.00 mm	N/A Seal Guides
110 X 4.5 B-90	N/A 122462	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 110.00 mm	N/A Seal Guides
115 X 4.5 B-70	N/A 122463	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 115.00 mm	N/A Seal Guides
115 X 4.5 B-90	N/A 122464	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 115.00 mm	N/A Seal Guides
118 X 4.5 B-70	N/A 122465	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 118.00 mm	N/A Seal Guides
118 X 4.5 B-90	N/A 122466	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 118.00 mm	N/A Seal Guides
120 X 4.5 B-70	N/A 122467	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 120.00 mm	N/A Seal Guides
120 X 4.5 B-90	N/A 122468	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 120.00 mm	N/A Seal Guides
122 X 4.5 B-70	N/A 122469	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 122.00 mm	N/A Seal Guides
122 X 4.5 B-90	N/A 122470	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 122.00 mm	N/A Seal Guides
124 X 4.5 B-70	N/A 122471	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 124.00 mm	N/A Seal Guides
124 X 4.5 B-90	N/A 122472	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 124.00 mm	N/A Seal Guides
126 X 4.5 B-70	N/A 122473	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 126.00 mm	N/A Seal Guides
126 X 4.5 B-90	N/A 122474	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 126.00 mm	N/A Seal Guides
128 X 4.5 B-70	N/A 122475	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 128.00 mm	N/A Seal Guides

N/A
122451

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 100.50 mm

N/A Seal Guides

100.5 X 4.5 B-90

N/A
122452

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 100.50 mm

N/A Seal Guides

101 X 4.5 B-70

N/A
122453

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 101.00 mm

N/A Seal Guides

101 X 4.5 B-90

N/A
122454

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 101.00 mm

N/A Seal Guides

103.5 X 4.5 B-70

N/A
122455

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 103.50 mm

N/A Seal Guides

103.5 X 4.5 B-90

N/A
122456

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 103.50 mm

N/A Seal Guides

105 X 4.5 B-70

N/A
122457

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 105.00 mm

N/A Seal Guides

105 X 4.5 B-90

N/A
122458

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 105.00 mm

N/A Seal Guides

106 X 4.5 B-70

N/A
122459

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 106.00 mm

N/A Seal Guides

106 X 4.5 B-90

N/A
122460

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 106.00 mm

N/A Seal Guides

110 X 4.5 B-70

N/A
122461

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 110.00 mm

N/A Seal Guides

110 X 4.5 B-90

N/A
122462

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 110.00 mm

N/A Seal Guides

115 X 4.5 B-70

N/A
122463

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 115.00 mm

N/A Seal Guides

115 X 4.5 B-90

N/A
122464

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 115.00 mm

N/A Seal Guides

118 X 4.5 B-70

N/A
122465

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 118.00 mm

N/A Seal Guides

118 X 4.5 B-90

N/A
122466

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 118.00 mm

N/A Seal Guides

120 X 4.5 B-70

N/A
122467

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 120.00 mm

N/A Seal Guides

120 X 4.5 B-90

N/A
122468

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 120.00 mm

N/A Seal Guides

122 X 4.5 B-70

N/A
122469

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 122.00 mm

N/A Seal Guides

122 X 4.5 B-90

N/A
122470

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 122.00 mm

N/A Seal Guides

124 X 4.5 B-70

N/A
122471

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 124.00 mm

N/A Seal Guides

124 X 4.5 B-90

N/A
122472

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 124.00 mm

N/A Seal Guides

126 X 4.5 B-70

N/A
122473

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 126.00 mm

N/A Seal Guides

126 X 4.5 B-90

N/A
122474

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 126.00 mm

N/A Seal Guides

128 X 4.5 B-70

N/A
122475

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 128.00 mm

N/A Seal Guides