NBR 120x140x7.5 TC - Double Lip Rotary Shaft Seal

Main Description:

The NBR 120x140x7.5 AO rotary shaft seal is a precision-engineered double lip oil seal designed to protect rotating components from lubricant leakage and external contamination. Manufactured from nitrile rubber (NBR), it provides excellent flexibility, durability, and resistance to oil, grease, and fuel, making it one of the most reliable sealing solutions for modern machinery and power transmission systems.

The AO design features two functional sealing lips: the main lip ensures tight contact with the shaft surface, maintaining proper lubrication and preventing oil escape, while the auxiliary dust lip shields the system against dirt, moisture, and other contaminants. This dual protection enhances sealing efficiency, extends bearing life, and reduces downtime in critical applications.

The NBR 120x140x7.5 AO shaft sealing ring is widely used across industrial machinery, hydraulic systems, automotive engines, gearboxes, compressors, and electric motors. Its metal-cased structure ensures a stable fit in the housing, even under vibration and high-speed conditions. The high-grade NBR compound maintains sealing integrity in temperatures ranging from -40°C to +100°C, offering consistent performance and long service life.

By combining technical precision and high material quality, this rotary oil seal guarantees excellent protection for rotating shafts in demanding industrial and automotive environments.

Applications

This double lip rotary shaft seal is suitable for:

• Gearboxes and industrial transmissions,

• Electric motors, pumps, and compressors,

• Agricultural and construction machinery,

• Hydraulic and automotive systems.

Its robust design ensures long-term reliability and minimizes wear on shafts and bearings, even under dynamic rotary motion and oil exposure.

Key Advantages

• Double lip construction for optimal sealing performance.

• Excellent resistance to oils, greases, and fuels.

• Stable operation under high speed and temperature variation.

• Metal outer casing ensures precise housing fit.

• Extended service life and reduced maintenance frequency.

• Suitable for both industrial and automotive applications.

Technical Data

FAQ - Frequently Asked Questions

1. What is the main difference between a single lip and double lip shaft seal?
A double lip seal includes an extra dust lip that provides additional protection against contaminants, improving system longevity.

2. Can NBR seals be used with hydraulic oil and lubricants?
Yes. NBR offers excellent compatibility with most mineral-based hydraulic oils and greases.

3. How to select the correct size of rotary shaft seal?
Match the inner diameter to the shaft size, the outer diameter to the housing, and check the width to ensure proper fit.

4. Is this seal suitable for both industrial and automotive applications?
Absolutely. The NBR 120x140x7.5 AO seal is ideal for engines, gearboxes, and mechanical drives.

5. Are there alternatives for high-temperature environments?
Yes, FKM (Viton®) or ACM seals are recommended for applications exceeding +100°C or involving aggressive chemicals.