NBR Single Lip Oil Seal 25x40x5 B1 - Shaft Seal

Industrial Applications of NBR Oil Seals

Advantages of Single Lip B1 Design

Technical Specifications

Main Product Description

The NBR single lip oil seal 25x40x5 B1 is a classic shaft seal designed for effective oil and grease retention in rotating machinery. This type of rotary shaft sealing is widely used in industrial and automotive applications where reliability, dimensional accuracy, and long service life are essential.

Manufactured from high-quality NBR (nitrile rubber), the seal offers excellent resistance to oils and greases, making it suitable for standard operating conditions in gearboxes, engines, pumps, and industrial machines. The material ensures stable performance under continuous operation while maintaining elasticity and sealing efficiency over time.

The single lip B1 design focuses on sealing the working medium from the inside, providing efficient oil sealing with low friction on the shaft surface. This results in reduced wear, smooth shaft rotation, and minimized energy losses. Due to its simple and proven construction, the B1 oil seal is easy to install and well suited for both new assemblies and maintenance operations.

With standardized dimensions 25x40x5, this oil seal can be easily integrated into common housings and shaft systems. It is frequently selected as a machine seal or engine oil seal in applications requiring dependable performance without unnecessary complexity. The product meets the expectations of B2B customers seeking consistent quality, repeatable parameters, and fast availability.

Commonly searched terms such as oil seal 25x40x5, NBR shaft seal, single lip oil seal, and rotary shaft seal reflect its strong position in industrial supply and maintenance markets.

Industrial Applications

• electric and combustion engines

• gearboxes and transmission systems

• pumps and hydraulic units

• industrial and agricultural machinery

• rotating shafts and drive systems

Advantages of the Single Lip Oil Seal

• effective rotary shaft sealing

• high durability in continuous operation

• resistance to oils, greases, and fuels

• low friction and stable shaft contact

• simple and proven B1 construction

• wide range of industrial applications

Technical Specifications

• Product type: Oil seal / shaft seal

• Design: Single lip B1

• Material: NBR (nitrile rubber)

• Inner diameter: 25 mm

• Outer diameter: 40 mm

• Width: 5 mm

• Function: Oil and grease sealing

FAQ - Frequently Asked Questions

What is the difference between single lip and double lip oil seals?
A single lip oil seal seals the working medium from the inside, while a double lip design adds protection against external contamination.

Is NBR suitable for oil sealing applications?
Yes, NBR provides excellent resistance to oils, greases, and fuels commonly used in industrial and automotive systems.

How do I select the correct oil seal size?
Match the inner diameter to the shaft, the outer diameter to the housing, and the width to the seal groove.

Can this oil seal be used in engines?
Yes, it is commonly used as an engine oil seal and gearbox seal.

Is the oil seal suitable for continuous operation?
Yes, it is designed for long-term use in industrial applications.