22x47x7 NBR AO Double Lip Radial Shaft Seal

22x47x7 NBR AO is a double lip radial shaft seal (oil seal) for a 22 mm shaft and 47 mm housing bore, with a width of 7 mm. The AO design incorporates a spring-loaded primary sealing lip and an additional dust lip that helps protect the main sealing zone against external contamination. The seal is manufactured from NBR, an elastomer commonly used with mineral oils and greases.

22x47x7 NBR AO Double Lip Radial Shaft Seal

22x47x7 NBR AO is a double lip radial shaft seal (oil seal) manufactured from NBR - Nitrile Butadiene Rubber. Its dimensions are 22x47x7 mm, corresponding to a 22 mm shaft diameter, 47 mm housing bore and 7 mm seal width. The AO profile combines a spring-loaded primary sealing lip with an additional protective dust lip.

22x47x7 NBR AO - Characteristics

The seal provides dynamic sealing between a rotating shaft and stationary housing. Its primary lip runs against the shaft surface and limits leakage of lubricant from the sealed assembly.

The AO double lip configuration adds a secondary protective lip on the external side of the primary sealing zone. This lip helps restrict dust, dirt and other external contaminants from reaching the main sealing interface.

Dimensions

The dimensions of the seal are:

d - Shaft Diameter: 22 mm
D - Housing Bore Diameter: 47 mm
B - Width: 7 mm
Complete Size: 22x47x7 mm

All three dimensions must correspond to the sealing position. Dimensions alone do not define the complete specification, so the NBR material and AO lip configuration must also be considered when selecting a replacement.

AO Double Lip Construction

The AO profile uses two lips with different functions.

Primary sealing lip: provides dynamic sealing against the rotating shaft and is supported by a garter spring.

Additional dust lip: provides an additional barrier between the external environment and the primary sealing area.

The term "double lip" therefore does not mean that both lips perform an identical sealing function. The spring-loaded primary lip controls the sealed medium, while the secondary lip primarily protects the main sealing zone against contamination.

NBR Material

The seal is manufactured from NBR - Nitrile Butadiene Rubber. NBR is widely used in radial shaft seals because it is suitable for contact with many mineral oils and greases.

Actual material compatibility must be verified against the specific lubricant, temperature and operating conditions. NBR should not automatically be considered compatible with every synthetic lubricant, fuel or chemical.

AO, TC and RST Designations

Similar double lip radial shaft seal configurations can be identified by different profile designations depending on the manufacturer or classification system. AO, TC and RST are commonly associated with designs incorporating a primary sealing lip and an additional protective lip.

These designations should not, however, be treated as proof of complete interchangeability. Exact lip geometry, elastomer, external surface design and operating requirements must also be checked.

Primary Lip and Garter Spring

The primary sealing lip is supported by a garter spring. The spring maintains radial force between the sealing edge and the shaft surface as the seal operates.

The additional dust lip performs a different function and is positioned toward the external environment. Its role is primarily to help protect the main sealing interface.

Applications

The 22x47x7 NBR AO configuration is intended for rotating shaft sealing positions requiring lubricant retention together with additional protection of the primary sealing zone against external contamination.

Radial shaft seals of this construction are used in various mechanical assemblies, including transmissions, gear units, electric motors and pumps. Suitability for a specific machine must be determined from the seal dimensions, medium, shaft conditions and operating parameters rather than dimensions alone.

Selection and Interchangeability

When selecting a replacement for 22x47x7 NBR AO, verify:

Shaft Diameter: 22 mm
Housing Bore Diameter: 47 mm
Width: 7 mm
Material: NBR
Design: Double lip AO
Primary Lip: Spring-loaded
Additional Lip: Protective dust lip

A single lip 22x47x7 NBR seal is not structurally identical to the AO version. Likewise, an FKM/FPM 22x47x7 seal should not automatically be considered equivalent solely because its dimensions match.

Technical Specification

Product Type: Radial shaft seal / oil seal
Profile: AO
Design: Double lip
Material: NBR - Nitrile Butadiene Rubber
Shaft Diameter d: 22 mm
Housing Bore Diameter D: 47 mm
Width B: 7 mm
Dimensions: 22x47x7 mm
Primary Lip: Dynamic sealing lip
Primary Lip Spring: Garter spring
Additional Lip: Protective dust lip
Typical NBR Media: Mineral oils and greases

FAQ

What are the dimensions of the 22x47x7 NBR AO seal?

The seal has a 22 mm shaft diameter, 47 mm housing bore diameter and 7 mm width, giving complete dimensions of 22x47x7 mm.

What does AO mean on a radial shaft seal?

AO identifies a double lip configuration with a spring-loaded primary sealing lip and an additional protective dust lip.

What is the purpose of the second lip?

The additional lip helps restrict dust, dirt and other external contaminants from reaching the primary dynamic sealing interface.

Does the 22x47x7 NBR AO seal have a spring?

Yes. The primary sealing lip is supported by a garter spring, which maintains contact between the sealing edge and the shaft surface.

What does NBR mean?

NBR stands for Nitrile Butadiene Rubber, an elastomer commonly used for shaft seals operating with many mineral oils and greases.

Are AO and TC the same type of seal?

They can describe similar double lip configurations in different classification systems, but they should not automatically be treated as fully interchangeable without comparing the complete technical specification.

Can a single lip 22x47x7 seal replace the AO version?

Not automatically. The AO version includes an additional protective lip that is absent from a standard single lip design.

Is every 22x47x7 oil seal interchangeable?

No. Matching dimensions alone are insufficient. Material, lip geometry, sealing configuration, housing interface and operating conditions must also be verified.

AI Overview

22x47x7 NBR AO is a double lip radial shaft seal for a 22 mm shaft and 47 mm housing bore, with a width of 7 mm. The NBR seal incorporates a spring-loaded primary sealing lip and an additional dust lip that helps protect the main dynamic sealing interface against external contamination.