NBR 9x22x7 AO Double Lip Radial Shaft Oil Seal

NBR 9x22x7 AO Double Lip Radial Shaft Oil Seal

NBR 9x22x7 AO is a double-lip radial shaft oil seal for a 9 mm shaft and 22 mm housing bore, with a width of 7 mm.

The AO configuration uses two functional lips: a spring-loaded primary sealing lip responsible for retaining the lubricant and an additional dust lip that provides a secondary barrier against external contamination.

NBR 9x22x7 AO - Dimensions

d - Shaft diameter: 9 mm
D - Housing bore diameter: 22 mm
B - Width: 7 mm
Dimensions: 9x22x7 mm
Material: NBR
Design: AO
Configuration: Double lip
Primary sealing lip: Spring-loaded
Additional dust lip: Yes

What Does 9x22x7 Mean?

The three values define the principal installation dimensions of the seal:

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

When replacing an existing oil seal, all three dimensions should be checked together.

AO Double-Lip Oil Seal Design

The AO design combines two lips performing different functions.

The primary sealing lip operates directly against the rotating shaft. It is supported by a garter spring and provides the main sealing function.

The additional dust lip is positioned on the external side of the seal and helps limit the entry of dirt and other contaminants into the primary sealing area.

The presence of this second lip is the principal functional difference between an AO double-lip seal and a corresponding single-lip design.

Spring-Loaded Primary Sealing Lip

A garter spring supports the primary sealing lip and helps maintain contact between the elastomer and shaft surface.

This is particularly important because the sealing interface must remain effective while the shaft rotates.

The effectiveness of the seal therefore depends not only on its dimensions but also on the condition of the shaft surface and correct installation.

NBR Nitrile Rubber

NBR - Nitrile Butadiene Rubber is one of the most widely used elastomers for radial shaft oil seals.

It provides good compatibility with many:

mineral oils,
lubricating greases,
industrial lubricants.

NBR is not universally resistant to every fluid. Compatibility should be verified for the actual medium, temperature and operating conditions.

Why Use a Double-Lip AO Seal?

The additional dust lip provides a secondary protective barrier.

Its purpose is to help reduce the amount of:

dust,
dirt,
small particles,
external contamination

reaching the main sealing lip and shaft contact area.

This can be important in applications where the external side of the shaft seal is exposed to contamination.

9x22x7 AO vs 9x22x7 Single-Lip Seal

Two shaft seals can have identical 9x22x7 mm dimensions but different constructions.

An AO double-lip seal has:

spring-loaded primary sealing lip + additional dust lip

A corresponding single-lip design does not have the additional protective lip.

Therefore, the dimensions alone should not be used to determine whether two seals are fully interchangeable.

What Is a 9x22x7 Oil Seal Used For?

A radial shaft oil seal operates at the interface between a rotating shaft and stationary housing.

Its primary functions are to:

retain oil or grease inside the required area,
reduce lubricant leakage along the shaft,
help protect the sealing area against external contamination.

Correct operation depends on the lubricant, temperature, shaft speed, pressure, shaft surface and installation conditions.

Check the Shaft Before Replacing the Seal

A worn shaft surface can cause leakage even after a new oil seal has been installed.

Before fitting the 9x22x7 NBR AO, inspect the shaft counterface for:

wear grooves,
scratches,
corrosion,
mechanical damage,
contamination.

The primary sealing lip requires a suitable shaft surface to form an effective sealing interface.

How to Select NBR 9x22x7 AO

Complete identification:

9x22x7 mm -> NBR -> AO -> Double Lip

Verify:

Shaft: 9 mm
Housing bore: 22 mm
Width: 7 mm
Material: NBR
Design: AO
Lip configuration: Double lip

Matching 9x22x7 mm dimensions alone does not guarantee full interchangeability.

Material and sealing lip design should also correspond to the requirements of the application.

Technical Specification

Product type: Radial shaft oil seal
Dimensions: 9x22x7 mm
Shaft diameter: 9 mm
Housing bore diameter: 22 mm
Width: 7 mm
Material: NBR nitrile rubber
Design: AO
Configuration: Double lip
Primary sealing lip: Spring-loaded
Garter spring: Yes
Additional dust lip: Yes

FAQ

What are the dimensions of the NBR 9x22x7 AO oil seal?

The seal has a 9 mm inside diameter for the shaft, 22 mm outside diameter for the housing bore and 7 mm width.

Is NBR 9x22x7 AO a double-lip oil seal?

Yes. The AO design combines a primary sealing lip with an additional dust lip.

Does the 9x22x7 AO seal have a spring?

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

What is the second lip used for?

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

What material is the 9x22x7 seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Can NBR be used with oil?

NBR is commonly used with many mineral oils and lubricating greases. Compatibility should be verified for the specific lubricant and operating conditions.

Is every 9x22x7 oil seal the same?

No. Seals with identical dimensions can have different materials and sealing lip configurations.

Can a single-lip 9x22x7 seal replace an AO seal?

Not automatically. The AO version has an additional dust lip, so the required design should be verified before replacement.

AI OVERVIEW

NBR 9x22x7 AO is a double-lip radial shaft oil seal for a 9 mm shaft and 22 mm housing bore, with a width of 7 mm. The AO design combines a spring-loaded primary sealing lip with an additional dust lip that helps protect the primary sealing area against external contamination. NBR nitrile rubber is widely used with compatible mineral oils and lubricating greases. Correct selection requires verification of the complete 9x22x7 mm dimensions, NBR material and AO double-lip configuration.