5-Pack NBR Rubber O-Rings CS 5.3mm Industrial Seal Gaskets

5-Pack NBR Rubber O-Ring Sealing Gaskets – CS 5.3mm

Keep your industrial and mechanical assemblies leak-free with these heavy-duty NBR (Nitrile Butadiene Rubber) O-Rings. Sold in a convenient 5-piece set, these precision-standard ring gaskets are designed for a wide range of sealing applications — from hydraulic and pneumatic systems to plumbing fittings, pumps, valves, and general machinery.

With a cross-section (CS) of 5.3mm and available internal diameters (ID) of 63 / 65 / 67 / 69 / 70 / 71 / 73 / 75 / 77.5 / 80mm, these versatile gaskets cover a broad range of standard sizing needs in one listing. Simply select the ID that matches your application.

Key Features

• Material: High-quality NBR (Nitrile Butadiene Rubber) — resistant to oils, fuels, and many industrial fluids
• Cross-Section (CS): 5.3mm for a reliable, consistent seal
• Multiple ID Options: 63mm, 65mm, 67mm, 69mm, 70mm, 71mm, 73mm, 75mm, 77.5mm, 80mm
• Shape: Standard round ring gasket profile
• Standard Compliant: Meets standard O-ring specifications for drop-in replacement use
• Pack of 5: Great value for maintenance kits and professional use
• Versatile Applications: Suitable for hydraulics, pneumatics, plumbing, automotive, and industrial equipment

Specifications

Related Products You May Need

Looking for other hardware and tool accessories? Check out these items from our store:

• 10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips
• 12pcs 16mm Momentary Push Button Switch 1NO Metal 2-Pin Self-Reset
• 10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals

Learn more: OSHA on personal protective equipment

Frequently Asked Questions

Q: What does NBR rubber mean and why is it used for O-rings?

A: NBR stands for Nitrile Butadiene Rubber, a synthetic rubber compound widely used in industrial sealing applications. It offers excellent resistance to oils, fuels, hydraulic fluids, and many common industrial chemicals, making it ideal for O-ring gaskets in mechanical, hydraulic, and pneumatic systems.

Q: How do I choose the correct inner diameter (ID) for my application?

A: Measure the groove or fitting where the O-ring will sit. The inner diameter (ID) should match the diameter of the shaft or bore it seals against. This listing offers IDs from 63mm to 80mm, all with a 5.3mm cross-section (CS). Select the option that matches your equipment's specification.

Q: Can these NBR O-rings be used in outdoor or automotive applications?

A: Yes. NBR rubber O-rings are commonly used in automotive systems, fuel lines, hydraulic equipment, and other demanding environments. They perform well across a range of temperatures and are resistant to petroleum-based fluids, making them suitable for both indoor and outdoor mechanical use.

Q: How many O-rings come in one order?

A: Each order includes 5 pieces of the O-ring in your selected inner diameter size. This makes the set ideal for maintenance kits, replacements, or professional repair jobs.

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.