Rubber O-Rings EPDM NBR VMQ FKM Silicone Seals Gasket Washer

Rubber O-Ring Seals – EPDM, NBR, VMQ & FKM Materials

Keep your plumbing, hydraulic, pneumatic, and mechanical systems leak-free with these precision-engineered rubber O-ring seals. Available in a wide range of materials and sizes, these standard-profile ring gaskets deliver a reliable, compression-based seal for virtually any application — from industrial machinery to household plumbing fittings.

Material Options

• EPDM (Green) – Excellent resistance to water, steam, and weathering; ideal for outdoor and plumbing use
• NBR / Nitrile (Black) – Outstanding oil and fuel resistance; great for automotive and hydraulic applications
• VMQ / Silicone (Red/White) – Wide temperature tolerance; suitable for food-grade and high-heat environments
• FKM / Fluorine (Green/Black) – Superior chemical resistance; designed for demanding industrial use

Key Features

• Cross-Section (CS): 1.5 mm — consistent seal profile for standard groove dimensions
• Outer Diameter (OD): 4–20 mm range — fits a variety of port and fitting sizes
• Standard dimensions for easy sourcing and direct replacement
• Ring gasket shape for uniform radial compression and long-lasting sealing
• Versatile color-coded materials for quick identification on the job
• Suitable for static and dynamic sealing applications
• Resistant to deformation under sustained compression

Typical Applications

• Plumbing fittings & pipe connectors
• Hydraulic & pneumatic cylinders
• Automotive fuel & oil systems
• Industrial pumps & valves
• Appliance water inlets & filters

Specifications

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Frequently Asked Questions

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

A: Each rubber compound is optimized for a different environment. NBR (nitrile) O-rings offer excellent resistance to oils and fuels, making them ideal for automotive and hydraulic use. EPDM O-rings handle water, steam, and UV exposure well, perfect for plumbing. VMQ (silicone) O-rings withstand high and low temperatures and are food-safe. FKM (fluorocarbon/fluorine) O-rings provide superior chemical resistance for harsh industrial settings.

Q: What does CS 1.5 mm and OD 4–20 mm mean for O-rings?

A: CS stands for Cross-Section, which is the thickness (diameter) of the rubber ring itself — 1.5 mm in this case. OD stands for Outer Diameter, the total outside measurement of the ring ranging from 4 mm to 20 mm. These dimensions ensure the O-ring fits correctly into its groove and provides a reliable compression seal.

Q: Are these O-rings suitable for food or drinking water applications?

A: VMQ (silicone) O-rings in this set are commonly used in food-grade and potable water applications due to their non-toxic, inert properties and broad temperature range. For specific regulatory compliance requirements, please verify the material grade with your local standards before use.

Q: Can these rubber O-ring seals be used as direct replacements?

A: Yes. These are standard-dimension O-rings, making them suitable for direct replacement in most standard-groove applications across plumbing, pneumatic, hydraulic, and mechanical assemblies. Simply match the CS and OD measurements to your existing seals.

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.