O-Ring 138x4 NBR 90 ShA

NBR 90 O-ring for demanding technical sealing

High oil resistance and extrusion stability

Industrial, hydraulic and pneumatic applications

O-Ring 138x4 NBR 90 ShA is a professional rubber sealing ring designed for reliable technical sealing in applications exposed to high pressure and intensive operating conditions. It is intended for B2B customers who require durability, dimensional stability and consistent performance in industrial systems.

The O-ring is manufactured from NBR rubber with a hardness of 90 ShA, providing high resistance to mineral oils, greases, fuels and common hydraulic media. The increased hardness significantly reduces the risk of extrusion in sealing gaps, making this sealing ring suitable for higher-pressure hydraulic and pneumatic applications. NBR material also offers good abrasion resistance and resistance to aging, supporting long service life.

With dimensions 138x4 mm, this sealing ring is well suited for large sealing grooves in flanges, covers, housings, cylinders and industrial machinery components. It can be used for static and semi-dynamic sealing, ensuring effective leak prevention and stable system operation. The predictable material behavior makes it a reliable choice for industrial applications where tightness and operational safety are critical.

The simple geometry allows easy installation and minimizes the risk of damage during assembly, which is essential for maintenance efficiency and continuous operation. This O-ring is a proven solution for hydraulic and pneumatic sealing systems operating under demanding conditions.

FAQ - frequently asked questions

Which material is the O-Ring 138x4 made of?
It is made of NBR rubber with a hardness of 90 ShA, resistant to oils and greases.

Where is this O-ring typically used?
In hydraulic, pneumatic and industrial sealing applications under higher pressure.

What is the advantage of NBR 90 ShA?
Higher hardness provides improved resistance to pressure and extrusion.

Can this O-ring be used in semi-dynamic applications?
Yes, when correctly installed and matched to operating conditions.

How do I select the correct NBR O-ring?
Consider diameter, cross-section, hardness, operating temperature and the sealing medium.