<h2>50-Pack Black NBR Nitrile Rubber O-Ring Seals — Reliable Sealing for Machinery &amp; Plumbing</h2> <p>Keep leaks at bay with this value-packed set of <strong>50 black NBR (Nitrile Butadiene Rubber) O-rings</strong>. With a cross-section of <strong>CS 1.8mm</strong> and inner diameters ranging from <strong>ID 1.8mm to 4mm</strong>, these precision ring gaskets deliver a dependable, long-lasting seal across a wide variety of machinery, plumbing, and industrial applications. Made in Mainland China.</p> <h3>Key Features</h3> <ul> <li> <strong>Wide Temperature Range:</strong> Rated for continuous use from <strong>-40°C to 120°C</strong> (-40°F to 248°F), making them suitable for both cold and high-heat environments.</li> <li> <strong>Oil Resistant:</strong> NBR material provides excellent resistance to petroleum-based oils, fuels, and hydraulic fluids — ideal for preventing oil leakage in engines and hydraulic systems.</li> <li> <strong>Superior Wear Resistance:</strong> Durable nitrile rubber construction holds up against friction and repeated compression cycles without cracking or deforming.</li> <li> <strong>Standard Dimensions:</strong> CS 1.8mm cross-section with ID 1.8mm–4mm — fits a wide range of standard ports, fittings, and connectors.</li> <li> <strong>Versatile Applications:</strong> Perfect for automotive, plumbing, hydraulics, pneumatics, pumps, compressors, valves, and general industrial machinery.</li> <li> <strong>Bulk Value Pack:</strong> 50 pieces per lot — always have a spare on hand for maintenance and repairs.</li> </ul> <h3>Specifications</h3> <table> <tbody> <tr> <td><strong>Material</strong></td> <td>Nitrile Butadiene Rubber (NBR)</td> </tr> <tr> <td><strong>Color</strong></td> <td>Black</td> </tr> <tr> <td><strong>Cross-Section (CS)</strong></td> <td>1.8mm</td> </tr> <tr> <td><strong>Inner Diameter (ID)</strong></td> <td>1.8mm – 4mm</td> </tr> <tr> <td><strong>Quantity</strong></td> <td>50 Pieces</td> </tr> <tr> <td><strong>Operating Temperature</strong></td> <td>-40°C to 120°C</td> </tr> <tr> <td><strong>Shape</strong></td> <td>Ring / Washer Gasket</td> </tr> <tr> <td><strong>Standard</strong></td> <td>Standard</td> </tr> <tr> <td><strong>Country of Origin</strong></td> <td>Made in Mainland China</td> </tr> </tbody> </table> <h3>Ideal For</h3> <ul> <li>Automotive engines, gearboxes, and fuel systems</li> <li>Hydraulic and pneumatic equipment</li> <li>Plumbing fittings, valves, and pipe connectors</li> <li>Industrial pumps and compressors</li> <li>General-purpose sealing in machinery and hardware</li> </ul> <h3>Shopping Tip</h3> <p>Need multiple sizes? Add all required sizes to your cart first and place a single order — combined shipping discounts apply automatically at checkout.</p> <p><strong>Note:</strong> Due to variations in display settings and lighting, the actual color may differ slightly from product images.</p> <h3>You May Also 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/12pcs-16mm-momentary-push-button-switch-1no-metal-2-pin-self-reset">12pcs 16mm Momentary Push Button Switch 1NO Metal 2-Pin Self-Reset</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 material are these O-rings made from, and why does it matter?</h4> <p>A: These O-rings are made from NBR (Nitrile Butadiene Rubber), a synthetic rubber specifically formulated for outstanding resistance to petroleum oils, fuels, and hydraulic fluids. NBR is a go-to choice for sealing applications in