Simmering 35x50x7 NBR AO/TC Double Lip Radial Shaft Oil Seal

What Is the Simmering 35x50x7 NBR AO/TC?

The Simmering 35x50x7 NBR AO/TC is a double lip radial shaft oil seal designed to provide reliable sealing between a rotating shaft and a stationary housing. Manufactured from NBR (Nitrile Butadiene Rubber, Buna-N), it features a primary sealing lip with a garter spring and a secondary dust lip that protects the sealing area from dirt, dust and moisture. The AO/TC design is one of the most widely used sealing profiles for industrial machinery, pumps, gearboxes, electric motors and hydraulic equipment operating with mineral oils and lubricating greases.

AO/TC Seal Design

The AO/TC profile is designed for applications where additional protection against external contamination is required.

Main design features:

• Primary sealing lip
• Garter spring for constant radial sealing force
• Secondary dust lip
• Reinforced metal insert
• NBR elastomer resistant to oils and greases

The additional dust lip significantly improves protection against abrasive particles and helps extend the service life of bearings and rotating components.

Technical Specification

Product Type: Radial Shaft Oil Seal

Design: AO/TC Double Lip

Seal Type: Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber, Buna-N)

Inside Diameter: 35 mm

Outside Diameter: 50 mm

Width: 7 mm

Primary Lip: Spring-loaded

Secondary Lip: Dust lip

Mounting Standard: ISO 6194 / DIN 3760

Colour: Black

Why Choose NBR?

NBR is the most commonly used elastomer for rotary shaft seals operating with oil-based lubricants.

Material advantages include:

• Excellent resistance to mineral oils
• Good grease compatibility
• Good resistance to hydraulic fluids
• High abrasion resistance
• Good mechanical strength
• Reliable long-term sealing performance
• Suitable for continuous industrial operation

These properties make NBR the standard material for general industrial sealing applications.

Typical Applications

The Simmering 35x50x7 NBR AO/TC is widely used in:

• Gearboxes
• Hydraulic pumps
• Electric motors
• Industrial pumps
• Speed reducers
• Hydraulic equipment
• Agricultural machinery
• Construction equipment
• Industrial machinery
• Power transmission systems
• General machine maintenance

Its double lip construction is particularly suitable for environments where dirt or dust may reach the sealing area.

How Does a Radial Shaft Oil Seal Work?

A radial shaft seal creates a dynamic seal between a rotating shaft and the housing.

Its main functions are to:

• Retain lubricating oil inside the system
• Prevent lubricant leakage
• Exclude dust, dirt and moisture
• Protect bearings and transmission components
• Increase equipment reliability
• Extend machine service life

The spring-loaded sealing lip maintains consistent contact pressure on the shaft throughout operation.

How to Select the Correct Oil Seal

Before installation, verify:

• Shaft diameter
• Housing bore diameter
• Seal width
• Seal design (AO/TC)
• Seal material
• Operating temperature
• Lubricant type
• Shaft surface condition

Correct seal selection is essential for reliable performance and maximum service life.

Why Engineers Choose AO/TC Oil Seals

• Double lip construction
• Excellent protection against contaminants
• Spring-loaded sealing lip
• Reliable oil retention
• High wear resistance
• Standard ISO 6194 / DIN 3760 dimensions
• Suitable for industrial and automotive applications

Frequently Asked Questions (FAQ)

What do the dimensions 35x50x7 mean?

They indicate a 35 mm shaft diameter, 50 mm housing bore diameter, and 7 mm seal width.

What does AO/TC mean?

AO/TC is a double lip radial shaft oil seal featuring a spring-loaded primary sealing lip and a secondary dust lip for additional contamination protection.

Is NBR resistant to mineral oils?

Yes. NBR provides excellent resistance to mineral oils, lubricating greases and many hydraulic fluids.

Where is the 35x50x7 oil seal commonly used?

It is commonly installed in pumps, gearboxes, electric motors, hydraulic equipment, agricultural machinery and industrial power transmission systems.

Is a double lip seal better than a single lip seal?

In dusty or contaminated environments, yes. The secondary dust lip helps prevent external contaminants from reaching the primary sealing lip.

Is this oil seal manufactured to international standards?

Yes. Its dimensions are compatible with ISO 6194 and DIN 3760 standards.