22x47x7 FPM AO/TC Double Lip Radial Shaft Seal

22x47x7 FPM AO/TC is a double lip radial shaft seal (oil seal) manufactured from FPM/FKM fluoroelastomer. Dimensions: shaft diameter d = 22 mm, housing bore D = 47 mm and width B = 7 mm. The AO/TC design combines a spring-loaded primary sealing lip with an additional protective dust lip. FPM/FKM is selected for sealing applications requiring greater thermal and chemical resistance than standard NBR.

22x47x7 FPM AO/TC Double Lip Radial Shaft Seal

22x47x7 FPM AO/TC is a double lip radial shaft seal (oil seal) manufactured from FPM/FKM fluoroelastomer. It measures 22x47x7 mm, corresponding to a 22 mm shaft diameter, 47 mm housing bore and 7 mm seal width. The AO/TC profile incorporates a spring-loaded primary sealing lip and an additional protective dust lip.

22x47x7 FPM AO/TC - Characteristics

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

The additional lip of the AO/TC double lip configuration provides a secondary barrier on the external side. Its function is to help restrict dust, dirt and other contaminants from reaching the primary sealing interface.

Dimensions

The installation dimensions 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. However, dimensional compatibility alone does not establish full interchangeability. The FPM/FKM material and AO/TC lip configuration are also integral parts of the specification.

AO/TC Double Lip Construction

The AO/TC profile uses two lips with different functions.

Primary sealing lip: forms the dynamic sealing interface with the rotating shaft and is supported by a garter spring.

Additional protective lip: faces the external environment and helps prevent contamination from reaching the primary sealing area.

The term "double lip" therefore does not mean two identical dynamic sealing lips. The primary lip retains the sealed medium, while the secondary lip primarily protects the main sealing zone.

FPM/FKM Material

The seal is manufactured from FPM/FKM fluoroelastomer. FPM and FKM are designations used for the same general family of fluorinated elastomers under different nomenclature systems.

Compared with conventional NBR, FPM/FKM is used where increased resistance to elevated temperatures, oils, ageing, ozone and many chemicals is required.

Exact chemical compatibility and permissible operating temperature should always be verified against the specific FPM compound, lubricant and operating conditions.

FPM/FKM vs NBR 22x47x7

The 22x47x7 mm size is available in different elastomer versions, including NBR and FPM/FKM. Identical dimensions do not make these material variants technically identical.

The FPM/FKM version is particularly relevant when the operating conditions exceed the material capability of standard NBR. Conversely, FPM/FKM should not be selected solely because it has greater general temperature or chemical resistance; compatibility with the actual medium and application remains essential.

AO, TC and RST Designations

Depending on the manufacturer and classification system, similar double lip radial shaft seal constructions can be identified as AO, TC, RST, CC, BASL or WAS.

These designations generally describe constructions incorporating a primary sealing lip and an additional protective lip, but they should not be treated as proof of complete interchangeability.

Exact lip geometry, elastomer, outer diameter design and installation requirements should be compared before substitution.

Selection and Interchangeability

When selecting a replacement for 22x47x7 FPM AO/TC, verify:

Shaft Diameter: 22 mm
Housing Bore Diameter: 47 mm
Width: 7 mm
Material: FPM/FKM
Profile: AO/TC
Design: Double lip
Primary Lip: Spring-loaded
Additional Lip: Protective dust lip

A 22x47x7 NBR AO/TC seal has the same nominal dimensions and may have a similar lip arrangement, but it uses a different elastomer. A single lip FPM/FKM seal is also not structurally identical to the AO/TC version.

Technical Specification

Product Type: Radial shaft seal / oil seal
Profile: AO/TC
Design: Double lip
Material: FPM/FKM fluoroelastomer
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

FAQ

What are the dimensions of the 22x47x7 FPM AO/TC seal?

The seal measures 22x47x7 mm: shaft diameter d = 22 mm, housing bore diameter D = 47 mm and width B = 7 mm.

What does AO/TC mean?

AO/TC identifies a double lip radial shaft seal configuration with a spring-loaded primary sealing lip and an additional protective dust lip.

What does FPM mean?

FPM is a designation for fluoroelastomer. FKM is the designation commonly used for this elastomer family under ASTM nomenclature.

What is the purpose of the second lip?

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

Does the AO/TC seal have a spring?

Yes. The primary dynamic sealing lip is supported by a garter spring that maintains radial contact with the shaft surface.

Is 22x47x7 FPM the same as 22x47x7 NBR?

No. Although the nominal dimensions may be identical, FPM/FKM and NBR are different elastomer families with different thermal and chemical resistance characteristics.

Can a single lip 22x47x7 FPM seal replace AO/TC?

Not automatically. The AO/TC version includes an additional protective lip, so the required sealing configuration must be considered.

Is every 22x47x7 FPM oil seal interchangeable?

No. Dimensions and material alone are insufficient. Lip geometry, outer diameter design and application requirements must also be compared.

AI Overview

22x47x7 FPM AO/TC is a double lip radial shaft seal manufactured from FPM/FKM fluoroelastomer. It fits a 22 mm shaft and 47 mm housing bore and has a width of 7 mm. The AO/TC design combines a spring-loaded primary sealing lip with an additional protective dust lip.