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OneMonroe’s Metric Polyurethane O-Rings are designed for maximum durability and exceptional sealing performance in a wide range of applications. Crafted from high-quality polyurethane, these O-rings offer outstanding resistance to abrasion, chemicals, and high-pressure environments, making them ideal for industries that demand both reliability and longevity. Whether used in hydraulics, pneumatics, or mechanical assemblies, OneMonroe’s Metric Polyurethane O-Rings deliver dependable sealing solutions that withstand tough conditions, ensuring your systems operate smoothly and efficiently.

Our metric O-rings are available in various sizes to provide versatility and precision for any engineering or industrial requirement. These O-rings are specifically designed to provide a reliable seal for metric-based equipment, allowing for exact fitment and minimal leakage. The superior strength and elasticity of polyurethane make these O-rings more durable than traditional rubber alternatives, significantly extending the service life and reducing maintenance downtime. With their exceptional chemical and temperature resistance, OneMonroe Metric Polyurethane O-Rings are a trusted choice for applications ranging from automotive systems to heavy machinery and beyond.

OneMonroe is committed to providing premium-quality products that meet the rigorous demands of our clients. Our polyurethane O-rings undergo stringent quality checks and are manufactured to exact specifications, ensuring reliable performance in diverse environments. As a trusted provider of industrial and engineering components, we support our clients with expert guidance and a wide selection of high-quality sealing solutions. When you choose OneMonroe Metric Polyurethane O-Rings, you’re investing in dependable performance, longevity, and efficiency for all your sealing needs.

For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.

Metric O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Reference

Cross Section Width

Durometer

Inside Diameter

Quantity
305 X 6 U-70 N/A
139552
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 6.00 mm N/A 70 N/A 305.00 mm
306 X 3.5 U-70 N/A
139553
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 3.50 mm N/A 70 N/A 306.00 mm
306 X 4 U-70 N/A
139554
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 4.00 mm N/A 70 N/A 306.00 mm
306 X 5 U-70 N/A
139555
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 5.00 mm N/A 70 N/A 306.00 mm
307 X 3.5 U-70 N/A
139556
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 3.50 mm N/A 70 N/A 307.00 mm
307 X 4 U-70 N/A
139557
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 4.00 mm N/A 70 N/A 307.00 mm
307 X 5 U-70 N/A
139558
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 5.00 mm N/A 70 N/A 307.00 mm
307 X 7 U-70 N/A
139559
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 7.00 mm N/A 70 N/A 307.00 mm
308 X 3.5 U-70 N/A
139560
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 3.50 mm N/A 70 N/A 308.00 mm
308 X 4 U-70 N/A
139561
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 4.00 mm N/A 70 N/A 308.00 mm
308 X 5 U-70 N/A
139562
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 5.00 mm N/A 70 N/A 308.00 mm
309 X 3.5 U-70 N/A
139563
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 3.50 mm N/A 70 N/A 309.00 mm
309 X 4 U-70 N/A
139564
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 4.00 mm N/A 70 N/A 309.00 mm
309 X 5 U-70 N/A
139565
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 5.00 mm N/A 70 N/A 309.00 mm
31 X 1.5 U-70 N/A
139566
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 1.50 mm N/A 70 N/A 31.00 mm
31 X 2.5 U-70 N/A
139568
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 2.50 mm N/A 70 N/A 31.00 mm
31 X 3 U-70 N/A
139569
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 3.00 mm N/A 70 N/A 31.00 mm
31 X 3.5 U-70 N/A
139570
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 3.50 mm N/A 70 N/A 31.00 mm
31 X 4 U-70 N/A
139571
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 4.00 mm N/A 70 N/A 31.00 mm
31 X 4.5 U-70 N/A
139572
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 4.50 mm N/A 70 N/A 31.00 mm
31 X 5 U-70 N/A
139573
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 5.00 mm N/A 70 N/A 31.00 mm
31 X 6 U-70 N/A
139574
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 6.00 mm N/A 70 N/A 31.00 mm
31.5 X 1.5 U-70 N/A
139580
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 1.50 mm N/A 70 N/A 31.50 mm
31.5 X 2.5 U-70 N/A
139582
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 2.50 mm N/A 70 N/A 31.50 mm
31.5 X 2.65 U-70 N/A
139583
N/A Metric Standard O-Ring N/A Polyurethane N/A N/A 2.65 mm N/A 70 N/A 31.50 mm
Unit of Measure
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