15x30x7 NBR AO Oil Seal - Double Lip Rotary Shaft Seal

5x30x7 NBR AO Oil Seal - Double Lip Rotary Shaft Seal

15x30x7 NBR AO Oil Seal is a double lip radial shaft seal designed for a 15 mm shaft, 30 mm housing bore and 7 mm installation width. The AO construction combines a spring-loaded primary sealing lip with an auxiliary dust lip that helps protect the main sealing interface against external contamination. Manufactured from NBR nitrile butadiene rubber, the seal is suitable for many applications involving mineral oils, lubricating greases and compatible industrial fluids.

Technical Specifications - 15x30x7 NBR AO

Product Type: Radial shaft seal / oil seal / Simmerring
Design: AO
Lip Design: Double lip
Dimensions: 15x30x7 mm
Material: NBR, nitrile butadiene rubber
Shaft Diameter d: 15 mm
Housing Bore D: 30 mm
Width B: 7 mm
Primary Sealing Lip: Yes
Auxiliary Dust Lip: Yes
Garter Spring: Yes
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 Double Lip Seal Design

The AO configuration uses two lips with separate sealing and protective functions.

The primary sealing lip operates directly against the rotating shaft. It is supported by a garter spring that maintains controlled radial contact pressure between the elastomer and shaft surface.

The auxiliary dust lip is positioned toward the external environment and helps reduce the ingress of dust, dirt and other contaminants toward the primary sealing zone.

This configuration combines lubricant retention with additional protection of the working sealing interface.

Dimensions of the 15x30x7 Oil Seal

The principal installation dimensions are:

d: 15 mm
D: 30 mm
B: 7 mm

This means the seal is intended for a nominal 15 mm shaft diameter, 30 mm housing bore and 7 mm installation width.

All three dimensions should be verified when selecting a replacement. A 15x30 mm seal with a different width or lip configuration should not automatically be considered interchangeable.

NBR Nitrile Butadiene Rubber

NBR, nitrile butadiene rubber, is one of the most commonly used elastomers for general-purpose radial shaft seals.

It provides good resistance to many:

• mineral oils
• lubricating greases
• compatible hydraulic oils
• technical lubricants
• oil-based industrial fluids

These properties make NBR suitable for numerous mechanical and industrial sealing applications.

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

How the 15x30x7 Shaft Seal Works

During operation, the 15 mm shaft rotates relative to the stationary housing.

The spring-loaded primary lip remains in controlled contact with the shaft surface, creating a dynamic sealing interface that helps retain lubricant inside the assembly.

The seal therefore performs several important functions:

• retains oil or grease
• reduces lubricant leakage along the shaft
• separates the lubricated assembly from its surroundings
• helps protect the sealing interface
• supports controlled lubrication conditions

Seal performance also depends on shaft finish, alignment, rotational speed, temperature and correct installation.

Auxiliary Dust Lip Protection

The second lip provides an additional barrier between the external environment and the primary sealing lip.

It helps reduce the ingress of:

• dust
• fine particles
• dirt
• general external contamination

This is particularly useful in machinery where the exposed shaft area may be subject to environmental contamination.

The auxiliary lip should not, however, be considered a substitute for specialized sealing systems required for extremely contaminated environments.

Applications of 15x30x7 NBR AO

The 15x30x7 NBR AO double lip oil seal can be used in appropriately designed:

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

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

AO vs Single Lip Oil Seal

The main difference between an AO seal and a typical single lip design is the additional dust lip.

A conventional single lip seal primarily provides lubricant retention.

The AO configuration adds a second protective barrier on the atmospheric side of the seal, helping reduce contamination of the primary lip contact area.

Where the original application specifies a double lip seal, a single lip version should not automatically be used as a replacement.

Selecting a 15x30x7 NBR AO Seal

Before selecting a replacement, verify:

Shaft Diameter: 15 mm
Housing Bore: 30 mm
Width: 7 mm
Material: NBR
Design: AO
Lip Configuration: Double lip
Dust Lip: Yes
Primary Lip: Spring-loaded
Operating Medium: Compatible with NBR
Temperature: Suitable for the specific compound
Shaft Speed: Appropriate for the seal design

Matching the 15x30x7 mm dimensions alone does not guarantee complete interchangeability.

Material and sealing lip configuration must also correspond to the requirements of the application.

Operational Advantages

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

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

Spring-loaded primary lip: supports consistent contact with the rotating shaft.

Auxiliary dust lip: helps protect the primary sealing zone from external contaminants.

15x30x7 mm dimensions: clearly defined installation geometry for replacement identification.

Versatile application: suitable for numerous industrial and mechanical rotating shaft arrangements.

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FAQ - 15x30x7 NBR AO Oil Seal

What are the dimensions of the 15x30x7 NBR AO oil seal?
The seal has a 15 mm inside diameter, 30 mm outside diameter and 7 mm width.

Is the 15x30x7 AO oil seal double lip?
Yes. It has a primary sealing lip and an additional dust protection lip.

Does the primary sealing lip have a spring?
Yes. The primary lip is supported by a garter spring that helps maintain contact with the rotating shaft.

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

Is this oil seal designed for a 15 mm shaft?
Yes. The first dimension in 15x30x7 indicates a nominal shaft diameter of 15 mm.

What is the purpose of the auxiliary lip?
It helps reduce the ingress of dust, dirt and other external contaminants toward the primary sealing interface.

Can a single lip 15x30x7 seal replace the AO version?
Not automatically. A single lip design does not provide the same auxiliary dust protection as the double lip AO configuration.

Are all 15x30x7 oil seals identical?
No. Seals with identical dimensions can differ in material, lip geometry, construction and intended operating conditions.