Rotary Shaft Seal 30x40x7 NBR TC Oil Seal - Double Lip GRN

Applications - Compact Rotary Seal for Industrial Systems

The Rotary Shaft Seal 30x40x7 NBR TC GRN is a precision shaft sealing ring designed for dynamic rotary applications in industrial and automotive systems. With dimensions 30x40x7 mm, this oil seal is widely used as an engine seal, gearbox seal, electric motor seal, and pump sealing element.

As a radial rotary shaft seal, it prevents lubricant leakage along rotating shafts while protecting internal components from contamination. Its compact width of 7 mm makes it suitable for installations with limited axial space, without compromising sealing performance. This makes it an effective technical seal for industrial applications requiring consistent operational reliability.

The product is commonly used in automotive assemblies, small gear transmissions, agricultural equipment, and light hydraulic units where moderate speeds and standard operating conditions apply.

TC Double Lip Design - Enhanced Protection and High Durability

This oil seal features a TC type double lip configuration. The primary sealing lip is spring-loaded to maintain continuous contact with the shaft, ensuring reliable oil retention. The additional dust lip provides extra protection against dirt, moisture, and airborne particles, offering superior performance compared to a single lip oil seal (SC type).

Manufactured from high-quality NBR, the seal provides strong resistance to oils and grease, making it suitable for most hydraulic and automotive seals operating within standard temperature ranges. NBR is valued for its elasticity, wear resistance, and cost-effective performance in rotating systems.

The reinforced metal insert ensures dimensional stability and a secure press-fit into the housing bore, increasing high durability under continuous operation. As a rotary oil seal, it supports stable shaft performance while reducing maintenance frequency.

Technical Data

• Brand: GRN

• Product type: Rotary shaft seal TC

• Design: Double lip oil seal

• Dimensions: 30x40x7 mm

• Material: NBR

• Application: Engine seal, gearbox oil seal, rotary sealing system

• Resistance: Oils, grease, standard industrial lubricants

• Structure: Spring-loaded main lip with auxiliary dust lip

FAQ - Frequently Asked Questions

What is the difference between a double lip and single lip oil seal?
A double lip oil seal includes an additional dust lip for contamination protection, while a single lip oil seal seals only the lubricant.

How do I select the correct shaft seal size?
The first dimension (30 mm) is the shaft diameter, the second (40 mm) is the housing bore, and the third (7 mm) is the seal width.

Is NBR suitable for high temperature environments?
NBR performs well in standard industrial and automotive temperature ranges. For higher temperatures, FKM materials are recommended.

Can this seal be used in hydraulic systems?
It is suitable for low-pressure rotary applications but not for high-pressure hydraulic cylinders.