<h2>30-Piece Black NBR Nitrile O-Ring Gasket Assortment — CS5mm, OD 18–50mm</h2> <p>Keep your machinery, plumbing, and hydraulic systems sealed tight with this professional-grade set of 30 black Nitrile Butadiene Rubber (NBR) O-rings. With a uniform cross-section of 5mm and outer diameters ranging from 18mm to 50mm, this assortment covers a wide range of sealing applications in a single, convenient pack.</p> <h3>Why Choose NBR O-Rings?</h3> <p>NBR (Nitrile Butadiene Rubber) is a top-choice material for industrial and mechanical sealing because of its outstanding resistance to oils, fuels, hydraulic fluids, and a broad range of chemicals. These O-rings maintain their shape and sealing integrity under demanding conditions, making them a go-to solution for engineers, plumbers, and DIY enthusiasts alike.</p> <h3>Key Features</h3> <ul> <li> <strong>Material:</strong> Premium NBR (Nitrile Butadiene Rubber) — excellent oil and fuel resistance</li> <li> <strong>Cross-Section (CS):</strong> 5mm uniform throughout the set</li> <li> <strong>Outer Diameter (OD):</strong> 18mm to 50mm — versatile range for multiple applications</li> <li> <strong>Color:</strong> Standard black for easy identification</li> <li> <strong>Quantity:</strong> 30 pieces per lot</li> <li> <strong>Shape:</strong> Standard ring gasket profile</li> <li> <strong>Standards:</strong> Manufactured to standard dimensions for easy compatibility</li> <li> <strong>Applications:</strong> Machinery, plumbing, hydraulic systems, pneumatic equipment, automotive, and industrial use</li> </ul> <h3>Wide Application Range</h3> <p>These O-rings are ideal for sealing joints, pipes, fittings, valves, and hydraulic cylinders. Whether you're maintaining industrial equipment or handling a home plumbing project, this set provides the right size for the job. Their durable NBR construction resists degradation from petroleum-based fluids, making them especially useful in oil-carrying systems.</p> <h3>What's in the Box?</h3> <ul> <li>30 × Black NBR O-Rings (CS5mm, OD18–50mm assortment)</li> </ul> <p>Made in Mainland China.</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/10-20mm-diamond-flat-grinding-wheel-dry-and-wet-use-heavy-duty-concrete-grinder-wheel-blue-vacuum-brazed">10/20mm Diamond Flat Grinding Wheel – Heavy Duty Concrete Grinder Wheel</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 compound known for its exceptional resistance to oils, fuels, and hydraulic fluids. NBR is the industry-standard choice for O-rings used in machinery, plumbing, and hydraulic sealing applications because it maintains a reliable seal even in demanding environments.</p> <h4>Q: What sizes are included in the 30-piece NBR O-ring set?</h4> <p>A: The set includes 30 black NBR O-rings all with a cross-section (CS) of 5mm. The outer diameters (OD) range from 18mm to 50mm, providing a versatile assortment suitable for a variety of pipe fittings, valves, and hydraulic components.</p> <h4>Q: Are these O-rings compatible with hydraulic and plumbing systems?</h4> <p>A: Yes. These standard-dimension NBR O-rings are well-suited for use in hydraulic cylinders, pneumatic equipment, plumbing fittings, and general industrial machinery. Their oil-resistant nitrile rubber construction ensures a durable and reliable seal across common fluid-handling