5-Pack Black NBR O-Rings CS5.7mm OD52-100mm Nitrile Gasket

5-Pack Black NBR O-Rings – Oil-Resistant Nitrile Rubber Sealing Washers

Keep your machinery, plumbing, and hydraulic systems leak-free with these premium Black NBR (Nitrile Butadiene Rubber) O-Rings. Each pack includes 5 pieces with a cross-section diameter of CS 5.7 mm and outer diameters ranging from OD 52 mm to OD 100 mm. Engineered to standard tolerances, these ring gaskets deliver a reliable, durable seal across a wide range of industrial and DIY applications.

Why Choose These NBR O-Rings?

• Oil-Resistant Material: Made from high-quality Nitrile Butadiene Rubber (NBR), these O-rings offer excellent resistance to petroleum-based oils, fuels, and hydraulic fluids.
• Wide Temperature Range: Maintains sealing integrity across a broad range of operating temperatures, making them suitable for both indoor and outdoor equipment.
• Standard Dimensions: CS 5.7 mm cross-section with OD options from 52 mm to 100 mm — compatible with a wide variety of standard fittings and ports.
• Durable & Long-Lasting: Resistant to aging, compression set, and wear, ensuring a long service life even under demanding conditions.
• Versatile Applications: Ideal for machinery, plumbing, hydraulic systems, pneumatic equipment, automotive components, and general industrial sealing tasks.
• Value Pack: 5 pieces per lot — stock up and have spares ready for maintenance and repairs.

Specifications

• Brand: Ouling
• Material: NBR (Nitrile Butadiene Rubber)
• Color: Black
• Cross-Section (CS): 5.7 mm
• Outer Diameter (OD): 52 mm – 100 mm (multiple sizes available)
• Shape: Ring Gasket
• Standard: Standard Dimensions
• Quantity: 5 Pieces per Lot
• Country of Origin: Made in China

Common Applications

• Hydraulic cylinders and pumps
• Plumbing pipe fittings and valves
• Pneumatic tools and equipment
• Automotive engines and gearboxes
• Industrial machinery and compressors
• General maintenance and repair sealing tasks

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Frequently Asked Questions

Q: What does NBR stand for, and why is it used for O-rings?

A: NBR stands for Nitrile Butadiene Rubber. It is a synthetic rubber widely used for O-rings and sealing gaskets because of its outstanding resistance to petroleum-based oils, fuels, and hydraulic fluids. Its excellent mechanical properties and durability make it the go-to material for industrial sealing applications.

Q: What outer diameter (OD) sizes are available in this listing?

A: This listing covers Black NBR O-rings with a cross-section of CS 5.7 mm and outer diameters (OD) ranging from 52 mm to 100 mm. Please select your required OD size from the available options when placing your order.

Q: Are these O-rings suitable for hydraulic and plumbing systems?

A: Yes. These standard-dimension NBR O-rings are specifically designed for use in hydraulic, plumbing, pneumatic, and general machinery sealing applications. Their oil-resistant properties make them well-suited for environments exposed to hydraulic fluids, water, and petroleum-based media.

Q: How many O-rings are included per order?

A: Each order includes 5 pieces (5 PCS/Lot) of the selected O-ring size, so you always have spares on hand for maintenance and repair tasks.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.