32x47x7 NBR AO/TC Oil Seal - Double Lip Rotary Shaft Seal

32x47x7 NBR AO/TC Oil Seal is a double lip radial shaft seal designed for a 32 mm shaft, 47 mm housing bore and 7 mm installation width. The AO/TC construction combines a spring-loaded primary sealing lip with an additional dust lip that helps protect the main sealing area against external contamination. Manufactured from NBR nitrile rubber, the seal is suitable for many applications involving mineral oils, lubricating greases and compatible industrial fluids.

Technical Specifications - 32x47x7 NBR AO/TC

Product Type: Radial shaft seal / oil seal / Simmerring
Design: AO / TC
Dimensions: 32x47x7 mm
Material: NBR, nitrile butadiene rubber
Shaft Diameter d: 32 mm
Housing Bore D: 47 mm
Width B: 7 mm
Primary Sealing Lip: Yes
Auxiliary Dust Lip: Yes
Garter Spring: Yes
Lip Configuration: Double lip
Outside Diameter: Rubber covered
Typical Temperature Range: approximately -30 to +100°C, depending on NBR compound, medium and operating conditions
Application: Dynamic sealing of rotating shafts

AO/TC Double Lip Seal Design

The defining feature of the 32x47x7 AO/TC oil seal is its two-lip configuration.

The primary sealing lip operates directly against the rotating shaft. A garter spring maintains radial contact pressure between the lip and shaft surface, supporting the primary sealing function.

The secondary lip is positioned toward the external environment and acts primarily as a dust protection lip.

This construction provides two separate functions:

Primary lip: retains lubricant within the mechanical assembly.

Auxiliary lip: helps reduce the ingress of dust, dirt and external contaminants toward the primary sealing area.

32x47x7 Oil Seal Dimensions

The three principal installation dimensions are:

d: 32 mm
D: 47 mm
B: 7 mm

This means the seal is intended for a nominal 32 mm shaft diameter, 47 mm housing bore and 7 mm installation width.

All three dimensions should be verified when selecting a replacement.

An oil seal with a 32 mm shaft diameter but a different outside diameter or width should not automatically be considered interchangeable.

NBR Nitrile Rubber

NBR, or nitrile butadiene rubber, is one of the most widely used elastomers for industrial radial shaft seals.

It provides good resistance to many:

• mineral oils
• lubricating greases
• hydraulic oils based on compatible mineral fluids
• technical lubricants
• other compatible industrial media

This combination of oil resistance, mechanical properties and practical operating characteristics makes NBR suitable for numerous general-purpose industrial sealing applications.

Actual compatibility depends on the specific fluid, additives, temperature and operating environment.

How a 32x47x7 Rotary Shaft Seal Works

A radial shaft seal creates a dynamic sealing interface between a rotating shaft and stationary housing.

The primary lip remains in controlled contact with the shaft surface. Its function is to retain lubricant inside the assembly while the shaft rotates.

Correct sealing performance depends not only on the oil seal itself but also on:

• shaft surface condition
• shaft hardness and finish
• concentricity
• rotational speed
• operating temperature
• lubrication
• installation accuracy
• pressure conditions

Damage, corrosion or excessive wear in the lip contact area can reduce sealing effectiveness even when a new oil seal is installed.

Auxiliary Dust Lip Protection

The additional lip provides a protective barrier on the atmospheric side of the seal.

Its purpose is to help limit the migration of:

• dust
• dirt
• fine particles
• external contamination

toward the primary sealing lip.

This makes the AO/TC configuration particularly useful where the sealing point requires both lubricant retention and additional protection from the surrounding environment.

Applications of 32x47x7 NBR AO/TC

The 32x47x7 NBR double lip oil seal can be used in appropriately designed:

• gearboxes
• electric motors
• pumps
• reducers
• drive systems
• industrial machinery
• agricultural machinery
• workshop equipment
• bearing arrangements
• rotating mechanical assemblies

The exact application should always be evaluated according to operating speed, temperature, pressure, lubricant and environmental conditions.

AO/TC vs Single Lip Oil Seal

A key difference between AO/TC and a typical single lip design is the additional dust protection lip.

A single lip seal primarily provides lubricant retention.

The AO/TC configuration adds another barrier between the environment and the primary sealing interface.

This can be beneficial in machinery exposed to dust and general external contamination.

However, seal design codes can vary between manufacturers. When selecting an equivalent product, the actual lip configuration and material should therefore be verified rather than relying exclusively on a letter designation.

Selecting a 32x47x7 Oil Seal

Before selecting a replacement, verify:

Shaft Diameter: 32 mm
Housing Bore: 47 mm
Width: 7 mm
Material: NBR
Design: AO / TC double lip
Dust Lip: Yes
Primary Lip: Spring-loaded
Operating Medium: Compatible with NBR
Temperature: Suitable for the specific compound
Shaft Speed: Suitable for the seal design

Matching the 32x47x7 mm dimensions alone does not guarantee complete interchangeability.

Material, lip configuration and operating conditions are also important.

Operational Advantages

Double lip construction: combines lubricant retention with additional contamination protection.

NBR material: suitable for many applications involving mineral oils and lubricating greases.

Spring-loaded primary lip: maintains controlled radial contact with the rotating shaft.

Auxiliary dust lip: helps protect the primary sealing zone against external contamination.

32x47x7 mm dimensions: clearly defined geometry for replacement identification.

Versatile shaft sealing: suitable for many industrial and mechanical rotating assemblies.

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FAQ - 32x47x7 NBR AO/TC Oil Seal

What are the dimensions of the 32x47x7 oil seal?
The seal has a 32 mm inside diameter, 47 mm outside diameter and 7 mm width.

What does the AO/TC double lip design mean?
The seal has a primary sealing lip for lubricant retention and an additional lip that helps protect the main sealing area against external contamination.

Does the 32x47x7 NBR oil seal have a spring?
Yes. The primary sealing lip is supported by a garter spring.

Is NBR suitable for oil sealing applications?
Yes. NBR provides good resistance to many mineral oils and lubricating greases and is widely used for industrial oil seals.

What is the purpose of the second lip?
The auxiliary lip primarily helps prevent dust, dirt and other external contaminants from reaching the main sealing interface.

Is this oil seal designed for a 32 mm shaft?
Yes. The first dimension, 32 mm, identifies the nominal shaft diameter.

Can a single lip 32x47x7 seal replace an AO/TC version?
Not automatically. A single lip design does not provide the same auxiliary dust protection as a double lip AO/TC configuration.

Can any 32x47x7 oil seal be used as a replacement?
Not necessarily. In addition to dimensions, the material, lip design, operating medium, temperature and shaft speed should be verified.