<h2>NBR Nitrile Rubber O-Ring Seal Gaskets – Oil-Resistant, Durable &amp; Precise</h2> <p>Whether you're tackling plumbing repairs, hydraulic systems, automotive maintenance, or industrial machinery, these <strong>Nitrile Butadiene Rubber (NBR) O-Ring Seal Gaskets</strong> deliver a reliable, leak-free seal every time. Available in packs of 10 or 50, these black round-profile washers cover a wide range of sizes to suit virtually any application.</p> <p><em>Made in Mainland China.</em></p> <h3>Key Specifications</h3> <ul> <li> <strong>Material:</strong> Nitrile Butadiene Rubber (NBR)</li> <li> <strong>Color:</strong> Black</li> <li> <strong>Wire Diameter (CS):</strong> 3mm or 5mm</li> <li> <strong>Outer Diameter (OD):</strong> 15mm to 105mm</li> <li> <strong>Temperature Range:</strong> -25°C to +100°C (-13°F to +212°F)</li> <li> <strong>Shore Hardness:</strong> 70°</li> <li> <strong>Pack Size:</strong> 10 or 50 pieces</li> </ul> <h3>How to Measure Your Size</h3> <p>Our sizing is listed as <strong>Outer Diameter (OD) × Wire Diameter (CS)</strong>. To find the inner diameter (ID), use this formula:<br> <strong>ID = OD − (2 × CS)</strong><br> <em>Example:</em> OD 20mm × CS 5mm → ID = 20 − (2 × 5) = <strong>10mm</strong></p> <h3>Why Choose These O-Rings?</h3> <ul> <li> <strong>Superior Sealing:</strong> Round cross-section design provides excellent contact between cylindrical overlapping surfaces, ensuring an airtight, leak-proof seal.</li> <li> <strong>Oil &amp; Chemical Resistance:</strong> High-quality NBR compound resists oil, fuel, heat, aging, abrasion, ozone, and a wide range of chemicals.</li> <li> <strong>Smooth, Burr-Free Finish:</strong> Fine polished surface prevents damage to mating components and ensures consistent performance.</li> <li> <strong>Precise Dimensions:</strong> Tight manufacturing tolerances keep sizing accurate, maintaining a long-lasting, color-stable seal.</li> <li> <strong>Eco-Friendly Materials:</strong> Formaldehyde-free, no unpleasant odor, safe and environmentally responsible.</li> </ul> <h3>Common Applications</h3> <ul> <li>Plumbing &amp; hydraulic systems</li> <li>Pneumatic equipment &amp; air compressors</li> <li>Automotive engines, valves &amp; fuel systems</li> <li>Industrial pumps, flanges &amp; mechanical seals</li> <li>Instrumentation &amp; constant-pressure valves</li> <li>General machinery maintenance &amp; repair</li> </ul> <h3>Important Notes</h3> <ul> <li>Please confirm the required size and material before purchasing and install the ring in the correct position.</li> <li>Slight manual measurement variations may occur — actual product dimensions are the standard reference.</li> <li>Product color may vary slightly from screen images due to monitor calibration.</li> </ul> <h3>You May Also Like</h3> <p>Looking for other workshop and hardware essentials? Check out these related products:</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-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> <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> </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 sizes are available for these NBR O-ring gaskets?</h4> <p>A: These NBR O-ring seal gaskets come with a wire diameter (CS) of either 3mm or 5mm, and outer diameters (OD) ranging from 15mm to 105mm. The inner diameter can be calculated as OD minus 2× the wire diameter. Please select the correct size before ordering.</p> <h4