10-Pack NBR O-Rings CS 3.55mm ID 75–87.5mm Sealing Gaskets

10-Pack NBR Rubber O-Rings — Industrial Sealing Gaskets

Keep your plumbing, hydraulic, pneumatic, and mechanical assemblies leak-free with these heavy-duty NBR (Nitrile Butadiene Rubber) O-Rings. Each pack contains 10 identical sealing rings with a cross-section (CS) of 3.55 mm and your choice of inner diameter (ID) from 75 mm up to 87.5 mm — giving you the exact fit you need for a wide range of industrial and DIY applications.

Made in Mainland China.

Why Choose These O-Rings?

• NBR Material: Nitrile rubber delivers excellent resistance to oils, fuels, hydraulic fluids, and many solvents — ideal for demanding environments.
• Precise Dimensions: Standard cross-section of 3.55 mm with ID options of 75 / 77.5 / 80 / 82.5 / 85 / 87.5 mm for accurate, reliable sealing.
• Versatile Use: Suitable for hydraulic systems, pneumatic equipment, plumbing fittings, pumps, compressors, valves, and general industrial machinery.
• Pack of 10: Cost-effective bulk quantity — perfect for maintenance, repair, and overhaul (MRO) stockpiling.
• Standard Sizing: Conforms to standard O-ring dimensions for easy cross-referencing and replacement.
• Durable & Flexible: Maintains elasticity and sealing integrity across a broad temperature and pressure range.

Product Specifications

Applications

• Hydraulic cylinders and pumps
• Pneumatic valves and actuators
• Plumbing fittings and pipe joints
• Automotive and marine engines
• Compressors and pressure vessels
• General industrial sealing needs

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Frequently Asked Questions

Q: What does NBR mean and why is it important for O-ring seals?

A: NBR stands for Nitrile Butadiene Rubber — a synthetic rubber known for its exceptional resistance to oils, fuels, hydraulic fluids, and many chemicals. This makes NBR O-rings ideal for sealing applications in hydraulic systems, automotive engines, plumbing, and industrial machinery where exposure to oils or petroleum-based fluids is common.

Q: Which inner diameter sizes are available in this 10-pack?

A: This listing is available in inner diameters of 75 mm, 77.5 mm, 80 mm, 82.5 mm, 85 mm, and 87.5 mm — all with a cross-section of 3.55 mm. Select your required ID from the variant options before adding to cart to ensure you receive the correct size for your application.

Q: Are these O-rings suitable for both high-pressure and low-pressure systems?

A: Yes. These standard NBR O-ring gaskets are designed for use across a range of hydraulic and pneumatic pressure conditions. NBR rubber maintains its sealing integrity under both low-pressure plumbing fittings and moderate-to-high-pressure hydraulic circuits, making these versatile for many industrial and DIY uses.

Q: How many O-rings are included in each pack?

A: Each pack contains 10 pieces of the same size O-ring, giving you a convenient supply for maintenance, repair, or overhaul tasks without needing to reorder frequently.

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.