<h2>Brown FKM Fluorine Rubber O-Rings – CS 2.5mm Seals &amp; Gaskets</h2> <p>Keep your equipment leak-free and performing at its best with these premium <strong>Brown FKM (Fluorine Rubber) O-Rings</strong>. Engineered with a 2.5mm cross-section (CS2.5mm), these ring gaskets deliver outstanding sealing performance across a wide range of industrial, automotive, and mechanical applications. Whether you need a dependable washer for hydraulic systems, fuel lines, or chemical-handling equipment, these FKM O-rings are built to hold up where standard rubber falls short.</p> <h3>Why Choose FKM Fluorine Rubber O-Rings?</h3> <ul> <li> <strong>High-Temperature Resistance:</strong> FKM material withstands extreme heat, making these O-rings ideal for demanding thermal environments.</li> <li> <strong>Excellent Chemical Resistance:</strong> Highly resistant to oils, fuels, hydraulic fluids, and many solvents — perfect for automotive and industrial use.</li> <li> <strong>Wear-Resistant Construction:</strong> Durable rubber compound ensures long service life even under continuous mechanical stress.</li> <li> <strong>Reliable Sealing:</strong> Standard ring gasket shape provides consistent, leak-proof seals in static and dynamic applications.</li> <li> <strong>Versatile Sizing:</strong> CS2.5mm cross-section fits a broad range of grooves and housing configurations.</li> <li> <strong>Brown Color:</strong> Easy identification in mixed-inventory environments; standard FKM brown finish.</li> </ul> <h3>Product Specifications</h3> <table> <tbody> <tr> <td><strong>Material</strong></td> <td>FKM (Fluorine Rubber)</td> </tr> <tr> <td><strong>Cross-Section (CS)</strong></td> <td>2.5mm</td> </tr> <tr> <td><strong>Color</strong></td> <td>Brown</td> </tr> <tr> <td><strong>Shape</strong></td> <td>Ring Gasket</td> </tr> <tr> <td><strong>Standard</strong></td> <td>Standard</td> </tr> <tr> <td><strong>High-Concern Chemicals</strong></td> <td>None</td> </tr> <tr> <td><strong>Country of Origin</strong></td> <td>Made in Mainland China</td> </tr> </tbody> </table> <h3>Common Applications</h3> <ul> <li>Automotive fuel systems and engines</li> <li>Hydraulic and pneumatic systems</li> <li>Industrial pumps and valves</li> <li>Chemical processing equipment</li> <li>Aerospace and high-temperature machinery</li> <li>Plumbing and fluid handling connections</li> </ul> <h3>Related Products You May Like</h3> <p>If you're working on mechanical or hardware projects, check out these related items from our store:</p> <ul> <li><a href="/products/stainless-steel-self-tapping-screws-m2-2-m4-8-phillips-wood-hinge">10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips</a></li> <li><a href="/products/10pcs-2-pin-quick-splice-spring-wire-connectors-lock-terminals">10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals</a></li> <li><a href="/products/10-20mm-diamond-flat-grinding-wheel-dry-and-wet-use-heavy-duty-concrete-grinder-wheel-blue-vacuum-brazed">10/20mm Diamond Flat Grinding Wheel – Heavy Duty Concrete Grinder</a></li> </ul> <p>Learn more: <a href="https://www.osha.gov/personal-protective-equipment" target="_blank" rel="noopener">OSHA on personal protective equipment</a></p> <h3>Frequently Asked Questions</h3> <h4>Q: What does FKM mean, and why are FKM O-rings better for high-temperature applications?</h4> <p>A: FKM stands for Fluorocarbon Elastomer (commonly known as Fluorine Rubber or Viton®-type rubber). FKM O-rings offer superior resistance to high temperatures, aggressive chemicals, and oils compared to standard NBR or EPDM rubber O-rings, making them a preferred choice for automotive, industrial, and chemical-handling sealing needs.</p> <h4>Q: What does CS2.5mm mean for an O-ring?</h4> <p>A: CS stands for "Cross-Section," which refers to the diameter of the O-ring's circular profile when viewed in cross-section. A CS of 2.5mm means the rubber cord that forms the ring is 2.5mm thick. This me