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
428 X 4 B-90	N/A 122124	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 428.00 mm	N/A Seal Guides
429 X 4 B-70	N/A 122125	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 429.00 mm	N/A Seal Guides
429 X 4 B-90	N/A 122126	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 429.00 mm	N/A Seal Guides
430x4.00B70	N/A 122127	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 430.00 mm	N/A Seal Guides
430 X 4 B-90	N/A 122128	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 430.00 mm	N/A Seal Guides
431 X 4 B-70	N/A 122129	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 431.00 mm	N/A Seal Guides
431 X 4 B-90	N/A 122130	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 431.00 mm	N/A Seal Guides
432 X 4 B-70	N/A 122131	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 432.00 mm	N/A Seal Guides
432 X 4 B-90	N/A 122132	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 432.00 mm	N/A Seal Guides
433 X 4 B-70	N/A 122133	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 433.00 mm	N/A Seal Guides
433 X 4 B-90	N/A 122134	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 433.00 mm	N/A Seal Guides
434 X 4 B-70	N/A 122135	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 434.00 mm	N/A Seal Guides
434 X 4 B-90	N/A 122136	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 434.00 mm	N/A Seal Guides
435 X 4 B-70	N/A 122137	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 435.00 mm	N/A Seal Guides
435 X 4 B-90	N/A 122138	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 435.00 mm	N/A Seal Guides
436 X 4 B-70	N/A 122139	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 436.00 mm	N/A Seal Guides
436 X 4 B-90	N/A 122140	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 436.00 mm	N/A Seal Guides
437 X 4 B-70	N/A 122141	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 437.00 mm	N/A Seal Guides
437 X 4 B-90	N/A 122142	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 437.00 mm	N/A Seal Guides
438x4.00B70	N/A 122143	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 438.00 mm	N/A Seal Guides
438 X 4 B-90	N/A 122144	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 438.00 mm	N/A Seal Guides
439 X 4 B-70	N/A 122145	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 439.00 mm	N/A Seal Guides
439 X 4 B-90	N/A 122146	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 439.00 mm	N/A Seal Guides
440x4.00B70	N/A 122147	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 440.00 mm	N/A Seal Guides
440 X 4 B-90	N/A 122148	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 440.00 mm	N/A Seal Guides

N/A
122124

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 428.00 mm

N/A Seal Guides

429 X 4 B-70

N/A
122125

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 429.00 mm

N/A Seal Guides

429 X 4 B-90

N/A
122126

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 429.00 mm

N/A Seal Guides

430x4.00B70

N/A
122127

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 430.00 mm

N/A Seal Guides

430 X 4 B-90

N/A
122128

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 430.00 mm

N/A Seal Guides

431 X 4 B-70

N/A
122129

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 431.00 mm

N/A Seal Guides

431 X 4 B-90

N/A
122130

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 431.00 mm

N/A Seal Guides

432 X 4 B-70

N/A
122131

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 432.00 mm

N/A Seal Guides

432 X 4 B-90

N/A
122132

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 432.00 mm

N/A Seal Guides

433 X 4 B-70

N/A
122133

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 433.00 mm

N/A Seal Guides

433 X 4 B-90

N/A
122134

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 433.00 mm

N/A Seal Guides

434 X 4 B-70

N/A
122135

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 434.00 mm

N/A Seal Guides

434 X 4 B-90

N/A
122136

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 434.00 mm

N/A Seal Guides

435 X 4 B-70

N/A
122137

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 435.00 mm

N/A Seal Guides

435 X 4 B-90

N/A
122138

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 435.00 mm

N/A Seal Guides

436 X 4 B-70

N/A
122139

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 436.00 mm

N/A Seal Guides

436 X 4 B-90

N/A
122140

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 436.00 mm

N/A Seal Guides

437 X 4 B-70

N/A
122141

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 437.00 mm

N/A Seal Guides

437 X 4 B-90

N/A
122142

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 437.00 mm

N/A Seal Guides

438x4.00B70

N/A
122143

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 438.00 mm

N/A Seal Guides

438 X 4 B-90

N/A
122144

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 438.00 mm

N/A Seal Guides

439 X 4 B-70

N/A
122145

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 439.00 mm

N/A Seal Guides

439 X 4 B-90

N/A
122146

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 439.00 mm

N/A Seal Guides

440x4.00B70

N/A
122147

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 70

N/A 440.00 mm

N/A Seal Guides

440 X 4 B-90

N/A
122148

N/A Metric Standard O-Ring

N/A Buna

N/A

N/A 4.00 mm

N/A 90

N/A 440.00 mm

N/A Seal Guides