CS 3mm OD 55–230mm EPDM NBR VMQ FKM Rubber O-Rings & Gaskets

CS 3mm Multi-Material Rubber O-Rings & Sealing Gaskets

Keep your plumbing, mechanical, and industrial assemblies leak-free with these precision-engineered O-rings and sealing gaskets. Available in a wide range of outer diameters (55–230mm) and multiple premium rubber compounds — EPDM, NBR (Nitrile), VMQ (Silicone), and FKM (Fluorine/Viton) — these standard ring gaskets deliver reliable sealing performance across a broad spectrum of applications and environments.

Made in Mainland China.

Why Choose These O-Rings?

• Multiple Material Options: Choose from EPDM (excellent weather & ozone resistance), NBR/Nitrile (ideal for oils & fuels), VMQ/Silicone (wide temperature range), or FKM/Fluorine (superior chemical resistance).
• Wide Size Range: CS 3mm cross-section with outer diameters from 55mm to 230mm — covering a broad array of standard fitting sizes.
• Color-Coded for Convenience: Available in green (FKM), black (NBR/Nitrile), red, white, and more — making material identification quick and easy on the job.
• Secure, Consistent Seal: Standard ring gasket shape ensures uniform compression and a dependable, long-lasting seal in both static and dynamic applications.
• Versatile Applications: Suitable for hydraulic systems, pneumatic equipment, plumbing, automotive assemblies, pumps, valves, and general industrial machinery.
• Standard Sizing: Manufactured to standard dimensions for straightforward drop-in replacement across common equipment and fittings.

Product Specifications

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Frequently Asked Questions

Q: What is the difference between EPDM, NBR, VMQ, and FKM O-rings?

A: Each rubber compound is suited to different environments. EPDM O-rings offer outstanding resistance to weathering, ozone, and water — ideal for outdoor or water-system use. NBR (Nitrile) O-rings excel in contact with petroleum-based oils and fuels, making them popular in automotive and hydraulic applications. VMQ (Silicone) O-rings perform across a wide temperature range and are commonly used in food-grade and high-temperature settings. FKM (Fluorine/Viton) O-rings provide superior resistance to aggressive chemicals and high temperatures, making them the choice for demanding industrial environments.

Q: What does CS 3mm and OD 55–230mm mean?

A: "CS" stands for Cross-Section — the diameter of the rubber cord that forms the ring, which is 3mm for all O-rings in this listing. "OD" stands for Outer Diameter, which ranges from 55mm to 230mm, giving you a wide selection of sizes to match your specific fitting or assembly requirements.

Q: Are these O-rings suitable for high-pressure applications?

A: These are standard-specification ring gaskets designed for a wide range of static and dynamic sealing applications including hydraulics, pneumatics, plumbing, pumps, and valves. For high-pressure systems, always verify compatibility of the chosen material and size with your application's specific pressure and temperature requirements before installation.

Q: How do I choose the correct O-ring size?

A: To select the correct O-ring, measure the groove or fitting where the seal will sit. You need the outer diameter (OD), inner diameter (ID — OD minus 2× the CS), and the cross-section (CS). All O-rings in this listing have a 3mm cross-section with outer diameters from 55mm to 230mm, covering many common standard fitting sizes.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.