<h2>20-Piece NBR Nitrile Rubber O-Ring Seal Gasket Set – CS 4mm</h2> <p>Keep your plumbing, machinery, and HVAC systems leak-free with this versatile pack of <strong>20 NBR (Nitrile Butadiene Rubber) O-rings</strong>. With a consistent cross-section of <strong>4mm</strong> and a wide range of outer diameters from <strong>22mm to 50mm</strong>, this set covers the most commonly needed sizes for both home repairs and industrial applications.</p> <h3>Key Features</h3> <ul> <li> <strong>Material:</strong> High-quality NBR (Nitrile Butadiene Rubber) – black color</li> <li> <strong>Cross-Section (CS):</strong> 4mm</li> <li> <strong>Outer Diameters Available:</strong> 22 / 24 / 25 / 28 / 30 / 32 / 34 / 35 / 38 / 40 / 42 / 45 / 48 / 50mm</li> <li> <strong>Inner Diameters:</strong> 14 / 16 / 17 / 20 / 22 / 24 / 26 / 27 / 30 / 32 / 34 / 37 / 40 / 42mm</li> <li> <strong>Shape:</strong> Standard ring gasket</li> <li> <strong>Quantity:</strong> 20 pieces per lot</li> </ul> <h3>Performance Properties</h3> <ul> <li>✅ <strong>Oil Resistant</strong> – Maintains integrity when exposed to petroleum-based fluids and lubricants</li> <li>✅ <strong>Wear Resistant</strong> – Durable construction for long-lasting sealing performance</li> <li>✅ <strong>Waterproof</strong> – Creates a reliable barrier against water and moisture ingress</li> <li>✅ <strong>Temperature Resistant</strong> – Stable performance across a wide temperature range, ideal for air conditioning and hydraulic systems</li> </ul> <h3>Where to Use</h3> <p>These standard NBR O-rings are suitable for a broad range of sealing applications:</p> <ul> <li>Plumbing fixtures and pipe fittings</li> <li>Air conditioning and HVAC systems</li> <li>Hydraulic and pneumatic equipment</li> <li>Industrial machinery and factory equipment</li> <li>Automotive fluid systems</li> <li>Home appliances and DIY repairs</li> </ul> <h3>Why Choose NBR O-Rings?</h3> <p>NBR rubber is the industry-standard material for sealing rings thanks to its excellent resistance to oils, fuels, and hydraulic fluids. Its flexibility ensures a tight, reliable seal even under compression, preventing costly leaks in both residential and commercial environments.</p> <p><strong>Made in Mainland China.</strong></p> <h3>You May Also Like</h3> <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/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 known for its outstanding resistance to oils, fuels, hydraulic fluids, and water. NBR is the preferred choice for sealing applications in plumbing, automotive, and industrial machinery where exposure to these substances is common.</p> <h4>Q: What sizes are included in this 20-piece NBR O-ring set?</h4> <p>A: All rings in this set share a 4mm cross-section (CS). The outer diameters range from 22mm to 50mm, covering sizes: 22, 24, 25, 28, 30, 32, 34, 35, 38, 40, 42, 45, 48, and 50mm. Inner diameters range from 14mm to 42mm accordingly.</p> <h4>Q: Are these O-rings suitable for air conditioning and HVAC use?</h4> <p>A: Yes. These NBR rubber O-rings are specifically designed to withstand the temperature variations and fluid types commonly found in air conditioning and H