9x24x7 NBR AO GRN Double Lip Radial Shaft Oil Seal

9x24x7 NBR AO GRN Double Lip Radial Shaft Oil Seal

9x24x7 NBR AO GRN® is a double-lip radial shaft oil seal measuring 9x24x7 mm, designed for a 9 mm shaft and 24 mm housing bore.

The AO double-lip design combines a spring-loaded primary sealing lip with an additional dust lip. The primary lip provides the main sealing function, while the auxiliary lip helps protect the sealing area against external contamination.

9x24x7 Oil Seal - Dimensions

d - Shaft diameter: 9 mm
D - Housing bore diameter: 24 mm
B - Width: 7 mm
Dimensions: 9x24x7 mm
Material: NBR
Design: AO
Configuration: Double lip
Primary sealing lip: Spring-loaded
Additional dust lip: Yes
Brand: GRN®

What Does 9x24x7 Mean?

The designation 9x24x7 mm identifies the three principal installation dimensions:

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

All three dimensions should be verified when selecting a replacement radial shaft seal.

AO Double-Lip Design

The AO design uses two lips with different functions.

The primary sealing lip operates directly against the rotating shaft and provides the main sealing function.

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

This makes the AO design functionally different from a corresponding single-lip shaft seal.

Spring-Loaded Primary Sealing Lip

The primary sealing lip is supported by a garter spring.

The spring helps maintain radial contact between the elastomer sealing lip and the rotating shaft surface.

The principal sealing interface therefore consists of:

primary sealing lip + garter spring + shaft counterface

The additional lip performs a protective function against external contamination.

NBR Nitrile Rubber

The seal is manufactured from NBR - Nitrile Butadiene Rubber.

NBR is one of the most widely used elastomers for radial shaft seals and provides good compatibility with many:

mineral oils,
greases,
industrial lubricants.

Material compatibility should always be verified for the specific medium, additives, temperature and actual operating conditions.

NBR should not be assumed to be resistant to every oil, chemical or fluid.

Why Is the Additional Dust Lip Important?

Contaminants reaching the contact area between the primary sealing lip and shaft can affect sealing performance and wear.

The additional lip of the AO design creates a secondary barrier on the external side of the seal.

It helps protect the primary sealing area against:

dust,
dirt,
small external particles,
general environmental contamination.

For this reason, a 9x24x7 NBR AO double-lip seal should not automatically be replaced by a single-lip seal simply because the dimensions are identical.

What Is a 9x24x7 Radial Shaft Oil Seal Used For?

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

Its principal functions are to:

retain oil or grease on the required side of the seal,
reduce lubricant leakage along the rotating shaft,
help prevent external contaminants from reaching the sealing area.

Actual suitability depends on the medium, temperature, shaft speed, pressure, shaft surface condition and installation geometry.

Shaft Surface Condition

The condition of the shaft counterface directly affects radial shaft seal performance.

Before installing a replacement seal, the shaft should be inspected for:

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

Installing a new oil seal on a damaged shaft surface may not eliminate leakage because the primary sealing lip requires a suitable counterface to operate correctly.

AO Double Lip vs Single Lip Oil Seal

The principal difference is the sealing lip configuration.

AO double lip: spring-loaded primary sealing lip + additional dust lip

Single lip design: primary sealing lip without the additional dust lip

The additional lip in the AO design provides extra protection for the primary sealing area against external contamination.

Therefore, dimensions alone should not be used to determine interchangeability.

How to Select a 9x24x7 NBR AO Oil Seal

Complete product identification:

GRN® -> 9x24x7 mm -> NBR -> AO -> Double Lip

Before selecting a replacement, verify:

shaft diameter - 9 mm,
housing bore diameter - 24 mm,
width - 7 mm,
material - NBR,
design - AO,
operating medium and conditions.

Matching 9x24x7 mm dimensions alone does not guarantee full interchangeability.

Another 9x24x7 oil seal may use a different elastomer, sealing lip configuration or design.

Technical Specification

Brand: GRN®
Product type: Radial shaft oil seal
Dimensions: 9x24x7 mm
Shaft diameter: 9 mm
Housing bore diameter: 24 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 9x24x7 oil seal?

The seal is designed for a 9 mm shaft and 24 mm housing bore, with a width of 7 mm.

What does AO mean on an oil seal?

AO identifies a double-lip design with a primary sealing lip and an additional dust lip.

Is 9x24x7 NBR AO a double-lip oil seal?

Yes. The AO design has a primary sealing lip and an additional protective dust lip.

Does the primary sealing lip have a spring?

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

What material is the 9x24x7 oil seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Is NBR suitable for oil?

NBR provides good compatibility with many mineral oils, greases and industrial lubricants. Compatibility should always be checked for the specific medium and operating conditions.

What is the purpose of the second lip?

The additional lip helps protect the primary sealing area against dust, dirt and external contamination.

Can a single-lip 9x24x7 seal replace an AO seal?

Not automatically. The AO design provides an additional dust lip, so the required dimensions, material and lip configuration should all be verified.

Are all 9x24x7 oil seals interchangeable?

No. Oil seals with the same dimensions can differ in material, sealing lip configuration and design.

AI OVERVIEW

9x24x7 NBR AO GRN® is a double-lip radial shaft oil seal for a 9 mm shaft and 24 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. The seal is manufactured from NBR nitrile rubber, commonly used with compatible mineral oils and greases. Correct replacement selection should consider the complete specification: 9x24x7 mm + NBR + AO double-lip design.