<h2>10-Pack NBR Nitrile O-Ring Seals — CS 5mm | OD 55 to 100mm</h2> <p>Keep your systems leak-free with these heavy-duty <strong>Nitrile (NBR) Rubber O-Rings</strong>. Sold in a convenient pack of 10, these precision-standard ring gaskets are built for demanding sealing applications in both industrial and household settings. With a 5mm cross-section and outside diameters ranging from 55mm to 100mm, you'll always have the right size on hand.</p> <p><strong>Made in Mainland China.</strong></p> <h3>Key Features</h3> <ul> <li> <strong>Material:</strong> High-quality NBR (Nitrile Butadiene Rubber) — renowned for its excellent resistance to oils, fuels, and chemicals</li> <li> <strong>Cross-Section (CS):</strong> 5mm</li> <li> <strong>Outside Diameter (OD):</strong> 55 / 60 / 65 / 70 / 75 / 80 / 85 / 90 / 95 / 100mm</li> <li> <strong>Inside Diameter (ID):</strong> 45 / 50 / 55 / 60 / 65 / 70 / 75 / 80 / 85 / 90mm</li> <li> <strong>Color:</strong> Black</li> <li> <strong>Shape:</strong> Standard Ring Gasket</li> <li> <strong>Quantity:</strong> 10 pieces per lot</li> </ul> <h3>Performance Properties</h3> <ul> <li>✅ <strong>Oil Resistant</strong> — maintains integrity when exposed to hydraulic fluids and oils</li> <li>✅ <strong>Wear Resistant</strong> — durable under repeated mechanical pressure and movement</li> <li>✅ <strong>Waterproof</strong> — creates a reliable liquid-tight seal</li> <li>✅ <strong>Temperature Resistant</strong> — performs across a wide operating temperature range</li> <li>✅ <strong>Standard Specification</strong> — compatible with most standard groove designs</li> </ul> <h3>Common Applications</h3> <ul> <li>Hydraulic and pneumatic systems</li> <li>Air conditioning units and HVAC components</li> <li>Plumbing fittings and pipe connections</li> <li>Automotive fluid systems</li> <li>Industrial machinery and factory equipment</li> <li>General household appliance maintenance</li> </ul> <h3>Related Products You May Like</h3> <p>Looking for more sealing or fastening solutions? Check out our <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> or browse our <a href="/products/10pcs-2-pin-quick-splice-spring-wire-connectors-lock-terminals">10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals</a> for more workshop essentials.</p> <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 sizes are included in the 10-piece NBR O-Ring set?</h4> <p>A: The set covers outside diameters of 55, 60, 65, 70, 75, 80, 85, 90, 95, and 100mm, all with a 5mm cross-section. Inside diameters range from 45mm to 90mm accordingly. Each order contains 10 rings total — one per size or multiples of a single size depending on the variant selected.</p> <h4>Q: Are these NBR O-Rings suitable for use with oil and hydraulic fluid?</h4> <p>A: Yes. Nitrile Butadiene Rubber (NBR) is specifically formulated to resist petroleum-based oils, hydraulic fluids, and fuels, making these O-rings an excellent choice for automotive, industrial, and hydraulic sealing applications.</p> <h4>Q: Can these rubber O-rings be used in air conditioning systems?</h4> <p>A: Absolutely. These NBR sealing rings are designed to work as air conditioning rubber washers and gaskets, forming a reliable, airtight seal in HVAC and AC refrigerant line connections.</p> <h4>Q: What is the difference between OD (outside diameter) and CS (cross-section)?</h4> <p>A: The OD (outside diameter) refers to the total outer width of the O-ring, while the CS (cross-section) is the thickness of the rubber cord itself — in this case 5mm. Both measurements are essential when matching an O-ring to the correct groove dimensions in your application.</p> <!-- production-packaging-notice --> <h3>Production &amp; Packag