NBR 70A Nitrile O-Ring Seals – Black Rubber Gasket Washers

NBR 70A Nitrile O-Ring Rubber Seals – Multiple Sizes

Keep leaks at bay with these premium NBR 70A Nitrile O-Rings. Engineered from high-quality nitrile rubber (Buna-N), these black O-ring gasket washers deliver reliable waterproof sealing performance across a wide range of applications — from plumbing and hydraulic fittings to automotive components and industrial machinery.

Available in cross-section (CS) diameters of 1mm, 1.5mm, 1.9mm, 2.4mm, and 3.1mm and outer diameters (OD) ranging from 10mm to 200mm, there's a size to suit virtually every standard sealing requirement.

Made in Mainland China.

Key Features

• Premium NBR 70A Material: Nitrile Butadiene Rubber with 70 Shore A hardness offers excellent resistance to oils, fuels, and common fluids.
• Waterproof Sealing: Dependable compression seal that prevents water, fluid, and air ingress in static and dynamic applications.
• Wide Size Range: CS 1/1.5/1.9/2.4/3.1mm × OD 10–200mm covers most standard and metric fitting requirements.
• Temperature Resistant: Performs reliably across a broad operating temperature range, suitable for both indoor and outdoor use.
• Chemical Resistance: Resistant to petroleum-based oils, hydraulic fluids, water, and many common solvents.
• Versatile Application: Ideal for plumbing, automotive, HVAC, pneumatics, hydraulics, and general mechanical assembly.
• Standard Sizing: Manufactured to standard dimensions for easy cross-referencing and drop-in replacement.
• Durable Black Finish: UV-stabilized black nitrile rubber maintains integrity over extended use cycles.

Specifications

Common Applications

• Plumbing fittings and pipe connections
• Automotive engine seals and fuel systems
• Hydraulic and pneumatic systems
• HVAC and refrigeration equipment
• General industrial machinery and equipment
• DIY home repair and maintenance

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Frequently Asked Questions

Q: What sizes of NBR O-rings are available in this set?

A: These nitrile O-rings are available in cross-section (CS) diameters of 1mm, 1.5mm, 1.9mm, 2.4mm, and 3.1mm, with outer diameters (OD) ranging from 10mm to 200mm — covering a wide spectrum of standard metric sealing applications.

Q: What is NBR 70A and why does it matter for O-ring seals?

A: NBR (Nitrile Butadiene Rubber) 70A refers to the rubber compound and its Shore A hardness rating of 70. This specific hardness provides an excellent balance of flexibility and compression strength, making these O-ring gaskets highly effective for waterproof sealing in oil, fuel, and water environments.

Q: Are these O-rings suitable for automotive and plumbing use?

A: Yes. NBR 70A nitrile rubber is widely used in automotive fuel systems, engine seals, hydraulic fittings, and plumbing connections thanks to its strong resistance to petroleum-based fluids, water, and a range of common chemicals.

Q: How do I choose the right O-ring size for my application?

A: Measure the groove or fitting where the O-ring will sit. You need the inner diameter (ID), outer diameter (OD), and cross-section (CS/width) of the groove. Match these measurements to the available sizes listed. When in doubt, refer to standard metric O-ring size charts for guidance.

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.