NBR VMQ FKM O-Rings 3.5mm CS OD 10–50mm Rubber Seals

Ouling NBR / VMQ / FKM O-Rings — 3.5 mm Cross-Section, OD 10–50 mm

Keep your plumbing, hydraulic, pneumatic, and mechanical systems leak-free with these precision-standard O-ring seals from Ouling. Available in three premium rubber compounds — Nitrile (NBR), Silicone (VMQ), and Fluorocarbon (FKM) — these ring gaskets are built to handle demanding temperature ranges and chemical environments. Whether you're sealing a pipe fitting, fuel system, or industrial valve, there's a compound and colour combination to suit your application.

Material Guide

• NBR (Nitrile Rubber) — Black: Excellent resistance to oils, fuels, and hydraulic fluids. Ideal for automotive and general-purpose sealing.
• VMQ (Silicone Rubber) — Red / White: Outstanding performance across a wide temperature range; great for food-grade, medical equipment, and heat-exposed applications.
• FKM (Fluorocarbon Rubber) — Black: Superior chemical and heat resistance; the go-to choice for aggressive chemical environments and high-temperature fuel systems.

Key Features

• Cross-Section (CS): 3.5 mm — standard profile for reliable groove-seat compression
• Outer Diameter (OD): 10 mm to 50 mm range — versatile sizing to cover a wide variety of applications
• Shape: Ring Gasket — circular sealing profile for consistent, even compression
• Material: NBR, VMQ (Silicone), or FKM (Fluorocarbon) Rubber
• Colours Available: Black (NBR/FKM), Red or White (VMQ Silicone)
• Standard Sizing: Manufactured to standard dimensions for easy cross-referencing and replacement
• Durability: Resistant to compression set, abrasion, and wear for long service life
• Versatile Use: Plumbing, automotive, hydraulics, pneumatics, industrial machinery, and appliance sealing

Specifications

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Frequently Asked Questions

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

A: NBR (Nitrile) O-rings offer strong resistance to oils and fuels, making them ideal for automotive and hydraulic use. VMQ (Silicone) O-rings perform well across a wide temperature range and are suitable for food-grade or heat-exposed applications. FKM (Fluorocarbon) O-rings provide the highest level of resistance to chemicals and high temperatures, suited for demanding industrial or fuel system environments.

Q: What sizes are available for these 3.5mm CS O-rings?

A: These O-rings feature a 3.5 mm cross-section (CS) and are available in outer diameters (OD) ranging from 10 mm up to 50 mm, covering a wide range of standard sealing applications.

Q: Can these O-rings be used for plumbing and pipe fittings?

A: Yes. These standard-sized ring gaskets are designed for use in plumbing, pipe fittings, hydraulic systems, pneumatic assemblies, and general industrial machinery sealing, making them a versatile addition to any toolkit or workshop.

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

A: Measure the groove or port you need to seal. Match the outer diameter (OD) to the groove diameter and confirm the cross-section (CS) fits the groove depth. These O-rings have a 3.5 mm CS, so ensure your groove accommodates that thickness for a proper compression 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.