O-Ring 495x20 NBR 70 ShA

O-Ring 495x20 NBR 70 ShA - Professional Technical Sealing

The O-Ring 495x20 NBR 70 ShA is a large diameter industrial rubber seal designed for demanding sealing applications where durability and reliability are critical. The 495x20 dimension refers to an inner diameter of 495 mm and a 20 mm cross section, making this O-Ring suitable for large housings, covers, tanks and heavy industrial assemblies.

Manufactured from Nitrile Butadiene Rubber NBR with a hardness of 70 ShA, this sealing ring provides high resistance to oils, greases and fuels commonly used in hydraulic and industrial systems. The material combines elasticity with mechanical strength, ensuring consistent sealing performance and long service life even under continuous load.

Applications in Hydraulic and Industrial Systems

The O-Ring 495x20 NBR 70 ShA is primarily used as a static seal in large scale industrial applications. Typical uses include:

• rubber gasket for covers and flanges

• sealing ring in industrial tanks

• component in hydraulic systems

• maintenance part for heavy machinery

Thanks to its high oil resistance and dimensional stability, this O-Ring minimizes leakage risk and supports pressure retention in industrial and hydraulic installations.

Material Properties and Performance

NBR 70 ShA is one of the most widely specified elastomers for industrial sealing. The O-Ring 495x20 offers:

• high resistance to mineral oils, greases and fuels

• good abrasion resistance

• stability under compression

• reliable static sealing performance

The 70 ShA hardness ensures an optimal balance between flexibility and mechanical durability, which is essential for large cross section sealing rings.

FAQ - Frequently Asked Questions

1. What is the O-Ring 495x20 NBR 70 ShA used for?
   It is used as a static sealing ring in large industrial housings, tanks and hydraulic systems.

2. Is NBR 70 ShA resistant to oils and fuels?
   Yes, NBR provides high resistance to mineral oils, greases and petroleum based fluids.

3. What is the operating temperature range?
   Standard NBR 70 ShA O-Rings typically operate between approximately -30 C and +120 C depending on working conditions.

4. Can this O-Ring be used in hydraulic applications?
   Yes, it is commonly used in hydraulic and industrial sealing systems.

5. How should a large O-Ring be selected?
   Verify the inner diameter, cross section, pressure requirements, temperature and media compatibility before installation.