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
63 X 4.5 B-70	N/A 122399	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 63.00 mm	N/A Seal Guides
63 X 4.5 B-90	N/A 122400	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 63.00 mm	N/A Seal Guides
64 X 4.5 B-70	N/A 122401	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 64.00 mm	N/A Seal Guides
64 X 4.5 B-90	N/A 122402	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 64.00 mm	N/A Seal Guides
65 X 4.5 B-70	N/A 122403	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 65.00 mm	N/A Seal Guides
65 X 4.5 B-90	N/A 122404	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 65.00 mm	N/A Seal Guides
66 X 4.5 B-70	N/A 122405	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 66.00 mm	N/A Seal Guides
66 X 4.5 B-90	N/A 122406	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 66.00 mm	N/A Seal Guides
68 X 4.5 B-70	N/A 122407	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 68.00 mm	N/A Seal Guides
68 X 4.5 B-90	N/A 122408	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 68.00 mm	N/A Seal Guides
69 X 4.5 B-70	N/A 122409	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 69.00 mm	N/A Seal Guides
69 X 4.5 B-90	N/A 122410	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 69.00 mm	N/A Seal Guides
70 X 4.5 B-70	N/A 122411	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 70.00 mm	N/A Seal Guides
70 X 4.5 B-90	N/A 122412	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 70.00 mm	N/A Seal Guides
71 X 4.5 B-70	N/A 122413	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 71.00 mm	N/A Seal Guides
71 X 4.5 B-90	N/A 122414	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 71.00 mm	N/A Seal Guides
73 X 4.5 B-70	N/A 122415	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 73.00 mm	N/A Seal Guides
73 X 4.5 B-90	N/A 122416	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 73.00 mm	N/A Seal Guides
74 X 4.5 B-70	N/A 122417	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 74.00 mm	N/A Seal Guides
74 X 4.5 B-90	N/A 122418	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 74.00 mm	N/A Seal Guides
75 X 4.5 B-70	N/A 122419	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 75.00 mm	N/A Seal Guides
75 X 4.5 B-90	N/A 122420	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 75.00 mm	N/A Seal Guides
76 X 4.5 B-70	N/A 122421	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 76.00 mm	N/A Seal Guides
76 X 4.5 B-90	N/A 122422	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 90	N/A 76.00 mm	N/A Seal Guides
80 X 4.5 B-70	N/A 122423	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.50 mm	N/A 70	N/A 80.00 mm	N/A Seal Guides

N/A
122399

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 63.00 mm

N/A Seal Guides

63 X 4.5 B-90

N/A
122400

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 63.00 mm

N/A Seal Guides

64 X 4.5 B-70

N/A
122401

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 64.00 mm

N/A Seal Guides

64 X 4.5 B-90

N/A
122402

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 64.00 mm

N/A Seal Guides

65 X 4.5 B-70

N/A
122403

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 65.00 mm

N/A Seal Guides

65 X 4.5 B-90

N/A
122404

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 65.00 mm

N/A Seal Guides

66 X 4.5 B-70

N/A
122405

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 66.00 mm

N/A Seal Guides

66 X 4.5 B-90

N/A
122406

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 66.00 mm

N/A Seal Guides

68 X 4.5 B-70

N/A
122407

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 68.00 mm

N/A Seal Guides

68 X 4.5 B-90

N/A
122408

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 68.00 mm

N/A Seal Guides

69 X 4.5 B-70

N/A
122409

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 69.00 mm

N/A Seal Guides

69 X 4.5 B-90

N/A
122410

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 69.00 mm

N/A Seal Guides

70 X 4.5 B-70

N/A
122411

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 70.00 mm

N/A Seal Guides

70 X 4.5 B-90

N/A
122412

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 70.00 mm

N/A Seal Guides

71 X 4.5 B-70

N/A
122413

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 71.00 mm

N/A Seal Guides

71 X 4.5 B-90

N/A
122414

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 71.00 mm

N/A Seal Guides

73 X 4.5 B-70

N/A
122415

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 73.00 mm

N/A Seal Guides

73 X 4.5 B-90

N/A
122416

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 73.00 mm

N/A Seal Guides

74 X 4.5 B-70

N/A
122417

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 74.00 mm

N/A Seal Guides

74 X 4.5 B-90

N/A
122418

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 74.00 mm

N/A Seal Guides

75 X 4.5 B-70

N/A
122419

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 75.00 mm

N/A Seal Guides

75 X 4.5 B-90

N/A
122420

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 75.00 mm

N/A Seal Guides

76 X 4.5 B-70

N/A
122421

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 76.00 mm

N/A Seal Guides

76 X 4.5 B-90

N/A
122422

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 90

N/A 76.00 mm

N/A Seal Guides

80 X 4.5 B-70

N/A
122423

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.50 mm

N/A 70

N/A 80.00 mm

N/A Seal Guides