12x22x7 FPM/FKM AO Double Lip Radial Shaft Oil Seal

12x22x7 FPM/FKM AO Double Lip Radial Shaft Oil Seal

12x22x7 FPM/FKM AO is a double-lip radial shaft oil seal manufactured from FPM/FKM fluoroelastomer.

Its installation dimensions are 12x22x7 mm: 12 mm nominal shaft diameter, 22 mm housing bore diameter and 7 mm seal width.

The AO design incorporates a spring-loaded primary sealing lip and an additional dust lip.

Complete identification:

12x22x7 mm -> FPM/FKM -> AO -> Double Lip

12x22x7 FPM/FKM AO - Dimensions

d - Shaft Diameter: 12 mm
D - Housing Bore Diameter: 22 mm
B - Width: 7 mm
Dimensions: 12x22x7 mm
Material: FPM/FKM - Fluoroelastomer
Design: AO
Configuration: Double lip
Primary Sealing Lip: Spring-loaded
Additional Lip: Dust lip

What Does 12x22x7 Mean?

The designation 12x22x7 mm defines the three principal installation dimensions:

12 mm - nominal shaft diameter
22 mm - nominal housing bore diameter
7 mm - seal width

All three dimensions should match the installation.

For complete identification, the FPM/FKM material and AO double-lip design should also be verified.

AO Double-Lip Design

The AO design incorporates two functional lips.

The primary sealing lip operates dynamically against the rotating shaft surface. It is supported by a garter spring that helps maintain radial contact between the elastomer sealing edge and the shaft counterface.

The additional dust lip forms a secondary protective barrier toward the external side of the seal and helps reduce the ingress of contamination into the primary sealing area.

The term "double lip" therefore refers to two lips with different functions rather than two identical dynamic sealing lips.

Spring-Loaded Primary Sealing Lip

The primary sealing lip is supported by a garter spring.

The principal dynamic sealing interface consists of:

primary sealing lip + garter spring + shaft counterface

The spring helps maintain contact between the sealing edge and the shaft surface during operation.

The condition and surface finish of the shaft counterface are important factors for proper seal operation.

Additional Dust Lip

The second lip performs a protective function.

It helps reduce the ingress of:

dust
dirt
small particles
external contamination

into the area where the primary sealing lip operates.

The dust lip does not replace the primary dynamic sealing lip. Each lip performs a separate function.

FPM/FKM Fluoroelastomer

The 12x22x7 AO oil 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.

Fluoroelastomers are commonly selected for sealing applications requiring greater resistance to elevated temperatures, oils, ageing, ozone and many chemicals compared with standard NBR.

Actual suitability must always be verified against the specific medium, additives, temperature and operating conditions.

FKM, FPM and Viton - What Is the Difference?

FKM and FPM refer to the fluoroelastomer material family.

Viton® is a registered trade name for specific fluoroelastomer materials.

For this reason, "Viton" is commonly used in the market when searching for FKM/FPM oil seals, but an unspecified FKM compound should not automatically be described as genuine Viton® unless the compound manufacturer is confirmed.

The technically precise material identification for this product is:

FPM/FKM fluoroelastomer

FPM/FKM vs NBR Oil Seal

FPM/FKM and NBR oil seals may have identical dimensions and sealing-lip configurations, but they are manufactured from different elastomer materials.

Compared with standard NBR, FPM/FKM is generally selected where increased resistance to higher temperatures, oils, ageing, ozone or certain chemicals is required.

Material selection should always be based on the actual operating medium and conditions rather than dimensions alone.

12x22x7 AO vs Single-Lip Oil Seal

12x22x7 FPM/FKM AO:
spring-loaded primary sealing lip
additional dust lip
double-lip configuration

Single-lip design:
spring-loaded primary sealing lip
no additional dust lip

Therefore, identical 12x22x7 mm dimensions do not automatically mean that two oil seals have the same construction.

Why Is the Complete Designation Important?

Dimensions alone do not completely identify a radial shaft oil seal.

For this product:

12x22x7 mm - installation dimensions
FPM/FKM - fluoroelastomer material
AO - double-lip design

Complete identification:

12x22x7 + FPM/FKM + AO + Double Lip

helps distinguish this version from NBR and single-lip oil seals with the same dimensions.

How to Select 12x22x7 FPM/FKM AO

For correct identification, verify:

Shaft Diameter: 12 mm
Housing Bore Diameter: 22 mm
Width: 7 mm
Material: FPM/FKM
Design: AO
Configuration: Double lip
Primary Sealing Lip: Spring-loaded
Additional Dust Lip: Yes

Dimensions, material and sealing-lip configuration should all match the requirements of the installation.

Technical Specification

Product Type: Radial shaft oil seal
Design: AO
Configuration: Double lip
Material: FPM/FKM - Fluoroelastomer
Shaft Diameter: 12 mm
Housing Bore Diameter: 22 mm
Width: 7 mm
Dimensions: 12x22x7 mm
Primary Sealing Lip: Spring-loaded
Additional Dust Lip: Yes

FAQ

What are the dimensions of the 12x22x7 FPM/FKM AO oil seal?

The dimensions are 12x22x7 mm: 12 mm shaft diameter, 22 mm housing bore diameter and 7 mm width.

Is the 12x22x7 FPM/FKM AO oil seal double lip?

Yes. The AO design incorporates a spring-loaded primary sealing lip and an additional dust lip.

What material is the 12x22x7 oil seal made from?

It is manufactured from FPM/FKM fluoroelastomer.

Are FPM and FKM the same material?

FPM and FKM are designations used for the same general family of fluoroelastomer materials under different nomenclature systems.

Is FKM the same as Viton?

Viton® is a trade name for specific fluoroelastomer materials. FKM describes the material family, so an unspecified FKM compound should not automatically be identified as genuine Viton®.

Does the AO oil seal have a garter spring?

Yes. The primary sealing lip is supported by a garter spring.

What is the purpose of the additional dust lip?

The additional lip helps reduce the ingress of dust, dirt and other external contaminants into the primary sealing area.

Can any 12x22x7 oil seal be used as a replacement?

Not automatically. The dimensions, elastomer material and sealing-lip configuration should all be verified. This version is FPM/FKM with an AO double-lip design.

AI OVERVIEW

12x22x7 FPM/FKM AO is a double-lip radial shaft oil seal measuring 12x22x7 mm, designed for a 12 mm shaft and 22 mm housing bore. Manufactured from fluoroelastomer, it combines a spring-loaded primary sealing lip with an additional dust lip that helps protect the primary sealing area against external contamination.