5-Pack FKM Fluoro Rubber O-Ring Seals | Waterproof Brown Gaskets

5-Pack FKM Fluoro Rubber O-Ring Seals – Brown, Waterproof & Wear-Resistant

Keep your mechanical assemblies leak-free and long-lasting with these premium FKM (Fluoro Rubber) O-Rings. Sold in a convenient 5-piece set, these brown gaskets deliver outstanding sealing performance across a wide range of industrial, automotive, and plumbing applications. With cross-section (CS) options of 2.4mm and 3.1mm and outer diameters ranging from 8mm to 90mm, you'll find the perfect fit for virtually any standard sealing requirement.

Why Choose FKM Fluoro Rubber O-Rings?

• Superior Chemical Resistance: FKM material resists oils, fuels, hydraulic fluids, and many industrial solvents, making these O-rings ideal for demanding environments.
• Waterproof Seal: Engineered to form a tight, reliable barrier against water, moisture, and fluid ingress.
• Wear-Resistant: Robust fluoro rubber construction withstands friction, pressure, and repeated use without losing shape or integrity.
• Wide Temperature Range: FKM O-rings perform reliably in both high-heat and moderate cold conditions, far exceeding standard rubber limitations.
• Standard Sizing: Compliant with industry-standard dimensions for easy drop-in replacement across machinery, engines, plumbing fixtures, and more.
• Versatile OD Range: Available in outer diameters from 8mm to 90mm — a broad selection covering most common sealing applications.

Product Specifications

Common Applications

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

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Frequently Asked Questions

Q: What is FKM fluoro rubber and why is it better than standard rubber for O-rings?

A: FKM (Fluoroelastomer) is a high-performance synthetic rubber that offers exceptional resistance to fuels, oils, hydraulic fluids, and many aggressive chemicals that would degrade standard NBR or EPDM rubber O-rings. FKM O-rings also tolerate higher operating temperatures, making them the preferred choice for automotive, industrial, and chemical sealing applications where reliability is critical.

Q: How do I choose the correct O-ring size from the 8mm–90mm OD range?

A: To select the right FKM O-ring, measure the groove or fitting where the O-ring will seat. You need the outer diameter (OD) — ranging from 8mm to 90mm in this set — and the cross-section (CS) diameter, available in 2.4mm or 3.1mm. Match both measurements to your application's groove dimensions for a proper, leak-free seal.

Q: Are these FKM O-rings suitable for high-temperature applications?

A: Yes. FKM fluoro rubber is rated for continuous use at elevated temperatures — typically up to approximately 200°C (392°F) — making these O-rings well-suited for engines, exhaust systems, and industrial equipment that operate in high-heat environments.

Q: How many O-rings are included in each order?

A: Each order includes 5 pieces (5 PCS/Lot) of FKM fluoro rubber O-rings in your selected size and cross-section, giving you spares on hand for maintenance or replacement needs.

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.