NBR VMQ FKM O-Rings 5mm CS OD 16–250mm Rubber Seal Gaskets

NBR, VMQ & FKM O-Rings — 5mm Cross-Section, OD 16–250mm

Upgrade your sealing applications with these precision-engineered O-rings from Ouling. Available in three high-performance rubber compounds — NBR (Nitrile), VMQ (Silicone), and FKM (Fluorine/Viton®-type) — these standard ring gaskets deliver reliable, leak-free seals across a wide range of industrial, mechanical, and plumbing uses. With a 5mm cross-section (CS) and outer diameters spanning 16mm to 250mm, there's a size for virtually every application.

Made in Mainland China.

Why Choose These O-Rings?

• Multiple Material Options: NBR (black nitrile) for oil and fuel resistance; VMQ (red/white silicone) for high-temperature flexibility; FKM (fluorine rubber) for superior chemical resistance.
• Wide Size Range: OD 16mm to 250mm with a consistent 5mm thickness — ideal for both small fittings and large industrial flanges.
• Ring Gasket Shape: Standard torus geometry for a perfect groove fit and a durable, compression-tight seal.
• High Durability: Engineered rubber compounds resist degradation from oils, fuels, solvents, water, steam, and many chemicals depending on material chosen.
• Colour-Coded for Easy ID: Black (NBR), Red or White (VMQ/FKM) — quickly identify the right compound for the job.
• Broad Compatibility: Suits hydraulic systems, pneumatic fittings, water pipes, pumps, automotive parts, and more.

Product Specifications

Ideal For

• Hydraulic and pneumatic systems
• Plumbing and pipe fittings
• Automotive engines and fuel systems
• Industrial machinery and pumps
• Chemical processing equipment
• DIY mechanical repairs and maintenance

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Frequently Asked Questions

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

A: NBR (Nitrile Butadiene Rubber) O-rings are best suited for oil, fuel, and petroleum-based fluids. VMQ (Silicone) O-rings excel in high-temperature environments and are food-safe in many applications. FKM (Fluorocarbon/Fluorine Rubber) O-rings offer outstanding resistance to harsh chemicals, acids, and high temperatures — making them ideal for demanding industrial or chemical environments.

Q: What sizes are available in this 5mm CS O-ring range?

A: These O-rings feature a 5mm cross-section (CS/thickness) and are available in outer diameters (OD) ranging from 16mm up to 250mm, covering a broad spectrum of standard sealing groove sizes for both small fittings and large-diameter industrial applications.

Q: Are these O-rings suitable for use in plumbing and water systems?

A: Yes. NBR and VMQ variants are widely used in plumbing, water pipe fittings, and pump seals. For applications involving hot water or steam, VMQ (silicone) is the recommended choice due to its superior temperature tolerance.

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

A: Measure the inner diameter (ID) of the groove or fitting, as well as the groove depth (which should match the CS of 5mm). Select the OD that corresponds to your groove's outer edge. Refer to standard O-ring sizing charts for precise groove dimension recommendations.

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.