<h2>Black FKM Fluorine Rubber O-Rings – CS 1.8mm Seals &amp; Gaskets</h2> <p>Keep your systems leak-free with these premium <strong>black FKM (fluorine rubber) O-rings</strong>. Featuring a cross-section thickness of <strong>CS 1.8mm</strong>, these ring gaskets are engineered for demanding industrial and mechanical applications where heat, chemicals, and wear are everyday challenges. Whether you're sealing hydraulic lines, pneumatic fittings, fuel systems, or plumbing connections, these O-rings deliver consistent, reliable performance.</p> <h3>Why Choose FKM Fluorine Rubber O-Rings?</h3> <ul> <li> <strong>Superior Temperature Resistance:</strong> FKM rubber withstands extreme high and low temperatures, maintaining a tight seal even under harsh thermal cycling conditions.</li> <li> <strong>Excellent Chemical Resistance:</strong> Highly resistant to oils, fuels, hydraulic fluids, lubricants, and a wide range of industrial chemicals — making them ideal for automotive, manufacturing, and plumbing use.</li> <li> <strong>Exceptional Wear Resistance:</strong> The durable fluoroelastomer compound resists compression set, abrasion, and aging, ensuring a long service life.</li> <li> <strong>Standard Ring Gasket Shape:</strong> Precision-molded to standard dimensions for easy, universal fitting in most metric and imperial grooves.</li> <li> <strong>Versatile Application:</strong> Suitable for use in engines, compressors, pumps, valves, faucets, and more — anywhere a dependable static or dynamic seal is required.</li> </ul> <h3>Product Specifications</h3> <table> <tr> <td><strong>Material</strong></td> <td>FKM Fluorine Rubber</td> </tr> <tr> <td><strong>Cross-Section Thickness (CS)</strong></td> <td>1.8 mm</td> </tr> <tr> <td><strong>Color</strong></td> <td>Black</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>Country of Origin</strong></td> <td>Made in China</td> </tr> </table> <h3>Perfect For</h3> <ul> <li>Automotive engine and fuel system sealing</li> <li>Hydraulic and pneumatic systems</li> <li>Industrial pumps, valves, and compressors</li> <li>Plumbing and pipe fittings</li> <li>DIY mechanical repairs and maintenance</li> </ul> <h3>Related Products You May Like</h3> <ul> <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/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-durable-gold-blade-nut-metal-universal-trimmer-accessories-anti-loosening-line-left-hand-thread-replacement-parts-1">10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories</a></li> </ul> <p>Learn more: <a href="https://www.osha.gov/eye-face-protection" target="_blank" rel="noopener">OSHA on eye and face protection</a></p> <h3>Frequently Asked Questions</h3> <h4>Q: What is FKM fluorine rubber and why is it used for O-ring seals?</h4> <p>A: FKM (fluoroelastomer) is a high-performance synthetic rubber known for its outstanding resistance to heat, chemicals, oils, and fuels. FKM O-ring seals are preferred in demanding environments — such as automotive engines, hydraulic systems, and industrial machinery — because they maintain their shape and sealing integrity far longer than standard rubber under extreme conditions.</p> <h4>Q: What does CS 1.8mm mean for an O-ring?</h4> <p>A: "CS" stands for Cross-Section, referring to the diameter of the O-ring's circular cross-section when cut. A CS of 1.8mm means the rubber cord that forms the ring is 1.8mm thick. This measurement is critical when selecting the correct O-ring for a specific groove or fitting to ensure a proper, leak-free seal.</p> <h4>Q: Are these O-rings suitable for high-temperature applications?</h4> <p>A: Yes.