FKM Fluoro Rubber Green O-Ring Seals 5-Pack | CS 3.5 & 5.7mm

FKM Fluoro Rubber O-Ring Gasket Seals – 5-Pack | Green, Waterproof & Wear-Resistant

Keep your machinery, plumbing, and equipment sealed tight with these premium FKM (Fluorocarbon) Fluoro Rubber O-Rings. Engineered for demanding environments, this 5-piece set delivers outstanding chemical resistance, excellent temperature stability, and long-lasting wear resistance across a wide range of industrial and mechanical applications.

Key Features

• Material: High-quality FKM (Fluoro Rubber / Fluorocarbon) — superior to standard nitrile rubber for chemical and heat resistance
• Cross-Section Diameter: Available in CS 3.5mm and CS 5.7mm
• Outer Diameter Range: OD 10mm to 220mm — a wide range to suit many applications
• Color: Distinctive green, making identification quick and easy
• Waterproof Seal: Provides a reliable, leak-free barrier against liquids and gases
• Wear-Resistant: Maintains performance under friction and pressure over extended use
• Standard Ring Gasket Shape: Compatible with standard O-ring grooves and seats
• Pack Quantity: 5 pieces per lot — great value for maintenance and repair kits

Specifications

Common Applications

These FKM O-rings are ideal for use in:

• Hydraulic and pneumatic systems
• Automotive engines and fuel systems
• Chemical processing equipment
• Plumbing and pipe fittings
• Pumps, valves, and compressors
• Industrial machinery and maintenance

Why Choose FKM Over Standard Rubber?

FKM (Fluorocarbon rubber) outperforms standard NBR and EPDM rubber in high-temperature environments and when exposed to oils, fuels, and aggressive chemicals. The green color makes these seals easy to distinguish from other O-ring materials in your kit.

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Frequently Asked Questions

Q: What does FKM mean and why is it important for O-ring seals?

A: FKM stands for Fluorocarbon rubber (also known as Viton-type rubber). FKM O-rings offer excellent resistance to high temperatures, oils, fuels, and many chemicals, making them far more durable than standard rubber O-rings in demanding industrial and mechanical applications.

Q: What size O-ring do I need — CS 3.5mm or CS 5.7mm?

A: The cross-section (CS) refers to the thickness of the O-ring's circular profile. CS 3.5mm is a thinner ring suited for tighter grooves, while CS 5.7mm is thicker for larger grooves. Always measure your groove depth and width before selecting. The OD (outer diameter) ranges from 10mm to 220mm to match a wide variety of fittings.

Q: Are these O-rings suitable for use with fuel or hydraulic fluid?

A: Yes. FKM fluoro rubber O-rings are highly compatible with petroleum-based fuels, hydraulic fluids, and many aggressive industrial chemicals. They are a popular choice for automotive fuel systems and hydraulic equipment precisely because of this compatibility.

Q: How many O-rings are included in one lot?

A: Each lot contains 5 pieces of FKM green O-rings in your selected size, offering great value for maintenance kits, repairs, or machine servicing tasks.

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.