EPDM NBR VMQ FKM Rubber O-Rings CS 3.1mm OD 9–54mm | Ouling
EPDM NBR VMQ FKM Rubber O-Rings CS 3.1mm OD 9–54mm | Ouling
Details
Premium Multi-Material Rubber O-Rings & Gasket Seals
Achieve a reliable, leak-free seal in any application with these high-quality rubber O-rings from Ouling. Available in a wide range of materials — EPDM, NBR (Nitrile), VMQ (Silicone), and FKM (Fluorine/Viton) — and a generous variety of outer diameters (OD 9–54mm) with a cross-section of 3.1mm, these ring gaskets cover virtually every standard sealing requirement in plumbing, hydraulics, pneumatics, automotive, and industrial settings.
Made in Mainland China.
Key Features
- Multiple Material Options: Choose from EPDM (green), NBR Nitrile (black), VMQ Silicone (red/white), or FKM Fluoroelastomer (green/black) to match your fluid and temperature requirements.
- Wide OD Range: Outer diameters from 9mm to 54mm — compatible with a broad range of standard fittings, valves, pumps, and connectors.
- CS 3.1mm Cross-Section: Consistent 3.1mm cord thickness ensures a snug, uniform seal every time.
- Standard Ring Gasket Shape: Classic O-ring profile fits standard grooves and glands for quick, tool-free installation.
- Chemical & Temperature Resistance: Each material offers distinct resistance properties — NBR excels with oils and fuels, EPDM handles water and steam, VMQ silicone suits high/low temperature extremes, and FKM resists aggressive chemicals and solvents.
- Versatile Colors: Available in black, green, red, and white for easy material identification on the job.
Material Guide
| Material | Best For | Typical Color |
|---|---|---|
| NBR (Nitrile) | Oils, fuels, hydraulic fluids | Black |
| EPDM | Water, steam, outdoor/weathering | Black / Green |
| VMQ (Silicone) | Extreme temperatures, food-grade applications | Red / White |
| FKM (Fluoroelastomer) | Aggressive chemicals, fuels, high temps | Green / Black |
Specifications
- Brand: Ouling
- Cross-Section (CS): 3.1mm
- Outer Diameter (OD): 9mm – 54mm
- Shape: Ring Gasket
- Standard: Standard
- Material: EPDM / NBR / VMQ / FKM Rubber
- Colors Available: Black, Green, Red, White
- Country of Origin: Made in Mainland China
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Frequently Asked Questions
Q: What is the difference between NBR, EPDM, VMQ, and FKM O-rings?
A: Each rubber material has distinct properties. NBR (Nitrile) O-rings are ideal for petroleum-based oils and fuels. EPDM O-rings excel in water, steam, and outdoor weathering environments. VMQ (Silicone) O-rings handle extreme temperature ranges and are often used in food-safe applications. FKM (Fluoroelastomer/Viton) O-rings offer superior resistance to aggressive chemicals, fuels, and high operating temperatures. Selecting the right material ensures a durable, long-lasting seal.
Q: What does CS 3.1mm and OD 9–54mm mean for O-rings?
A: CS stands for Cross-Section, which is the thickness (diameter) of the O-ring's cord — in this case 3.1mm. OD stands for Outer Diameter, which is the total outside measurement of the ring. These O-rings are available in outer diameters ranging from 9mm to 54mm, making them compatible with a wide range of standard grooves, fittings, and valves.
Q: Are these O-rings suitable for plumbing and automotive use?
A: Yes! These standard ring gaskets are widely used in plumbing, hydraulic systems, pneumatic equipment, automotive engines, pumps, and industrial machinery. Choose EPDM for plumbing water lines, NBR for automotive oil and fuel systems, and FKM for high-performance or chemical environments.
Q: How do I choose the correct size O-ring?
A: Measure the groove or fitting you need to seal. You'll need both the Inner Diameter (ID = OD minus 2×CS) and the Cross-Section (CS) of your groove. For these rings, the CS is 3.1mm, and outer diameters range from 9mm to 54mm. Matching both dimensions ensures a proper compression fit and leak-free seal.
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.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.