NBR Oil Seal 12x22x4 AO/TC GRN - Double Lip Rotary Shaft Seal

NBR Oil Seal 12x22x4 AO/TC GRN - Double Lip Rotary Shaft Seal

NBR Oil Seal 12x22x4 AO/TC GRN is a compact double-lip rotary shaft seal with dimensions 12x22x4 mm. Manufactured from NBR nitrile rubber, the AO/TC design combines a spring-loaded primary sealing lip with an additional dust lip. It is designed for a nominal 12 mm rotating shaft and a 22 mm housing bore, providing fluid retention while helping protect the primary sealing area against external contamination.

Technical data - GRN 12x22x4 AO/TC

Oil seal dimensions - 12x22x4 mm

The designation 12x22x4 mm defines the three principal dimensions:

12 mm - nominal shaft diameter

22 mm - nominal outside diameter / housing bore

4 mm - nominal seal width

Complete dimensions:

12x22x4 mm

The compact 4 mm width makes this seal particularly suitable for sealing arrangements where axial installation space is limited.

What does AO/TC mean?

AO/TC identifies a rotary shaft seal configuration incorporating:

a spring-loaded primary sealing lip

and

an additional auxiliary dust lip

This type of seal is commonly described as:

double lip oil seal

double lip rotary shaft seal

oil seal with dust lip

TC oil seal

The auxiliary lip helps reduce the ingress of dust and other external contamination into the area where the primary sealing lip operates against the shaft.

Seal profile codes are not fully standardized between manufacturers. When selecting an equivalent from another brand, the actual lip configuration should therefore be compared rather than relying only on the AO or TC designation.

Double lip design

GRN 12x22x4 AO/TC incorporates two functional sealing lips.

The primary sealing lip operates against the rotating shaft and performs the principal fluid-retention function.

The auxiliary dust lip faces the external environment and helps protect the primary sealing zone against dust and contamination.

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

NBR nitrile rubber

The seal is manufactured from NBR - nitrile rubber, one of the most widely used elastomers in rotary shaft sealing technology.

Typical NBR characteristics include:

• good resistance to many mineral oils

• good resistance to many greases

• good abrasion resistance

• good mechanical properties

• widespread use in industrial sealing systems

NBR is not universally resistant to every chemical, fluid or temperature condition.

Compatibility with the actual operating medium, temperature and application conditions should always be verified.

How does the 12x22x4 oil seal work?

The seal is installed in a housing bore with a nominal diameter of 22 mm.

The primary sealing lip operates against a rotating shaft with a nominal diameter of 12 mm.

The garter spring helps maintain the required contact between the primary sealing lip and the shaft surface.

The additional dust lip provides an extra barrier between the primary sealing zone and the external environment.

AO/TC vs single lip oil seal

The principal difference is the presence of the auxiliary dust lip.

AO/TC - spring-loaded primary sealing lip plus auxiliary dust lip.

Single-lip design - primary sealing lip without an additional dust lip.

The AO/TC double-lip configuration is particularly useful where the primary sealing zone requires additional protection against contamination from the surrounding environment.

NBR vs FKM/FPM

Rotary shaft seals with dimensions 12x22x4 mm can be manufactured from different elastomers.

NBR is widely used in standard applications involving many mineral oils and greases.

FKM/FPM belongs to the fluoroelastomer family and provides a different chemical and temperature resistance profile.

A 12x22x4 NBR seal and a 12x22x4 FKM/FPM seal should not be considered automatically interchangeable solely because their dimensions are identical.

The operating medium, temperature, shaft speed and other application conditions must also be considered.

Typical applications

Double-lip AO/TC rotary shaft seals can be used in compact mechanical systems incorporating rotating shafts.

Typical application areas may include:

• small gearboxes

• geared motors

• electric motors

• pumps

• mechanical drive systems

• industrial machinery

• production equipment

• agricultural machinery

• compact mechanical assemblies

• oil- and grease-lubricated mechanisms

These are typical applications of rotary shaft seals and do not confirm the suitability of GRN 12x22x4 AO/TC for a specific machine.

Alternative designations and search references

The product may also be searched for as:

Oil seal 12x22x4

NBR oil seal 12x22x4

12x22x4 NBR oil seal

12x22x4 AO oil seal

12x22x4 TC oil seal

12x22x4 AO/TC oil seal

GRN 12x22x4 oil seal

GRN 12x22x4 AO/TC

12x22x4 rotary shaft seal

12x22x4 double lip oil seal

12x22x4 oil seal with dust lip

Simmerring 12x22x4

Simmerring NBR 12x22x4

Simmerring 12x22x4 AO

Simmerring 12x22x4 TC

Shaft seal 12x22x4

Rotary seal 12x22x4

The primary product identification is:

NBR Oil Seal 12x22x4 AO/TC GRN

Selection and interchangeability

When selecting an equivalent seal, verify:

• shaft diameter 12 mm

• housing bore diameter 22 mm

• seal width 4 mm

• AO/TC design

• double-lip construction

• NBR material

• operating medium

• operating temperature

• shaft rotational speed

• shaft surface condition

• pressure conditions

Matching the 12x22x4 mm dimensions alone does not guarantee complete interchangeability.

Seals with identical dimensions may differ in elastomer material, lip geometry, external construction and intended operating conditions.

Installation

Before installation, inspect the shaft surface and housing bore.

The shaft surface operating against the primary sealing lip should be clean and free from sharp edges, corrosion, scratches or other damage that could affect sealing performance.

During installation:

• maintain clean working conditions

• protect the sealing lips from damage

• avoid tilting the seal

• press the seal evenly into the housing

• protect the lips from sharp shaft edges

• provide appropriate initial lubrication where required

As a general installation principle, the primary spring-loaded sealing lip should face the fluid or lubricant that the seal is intended to retain.

The auxiliary dust lip normally faces the external environment.

FAQ - GRN 12x22x4 NBR AO/TC Oil Seal

What are the dimensions of the GRN 12x22x4 oil seal?

The seal is designed for a nominal 12 mm shaft, has a 22 mm outside diameter and is 4 mm wide.

What material is the 12x22x4 seal made from?

GRN 12x22x4 AO/TC is manufactured from NBR nitrile rubber.

Is 12x22x4 AO/TC a double lip oil seal?

Yes. The AO/TC configuration incorporates a primary sealing lip and an additional auxiliary dust lip.

What does TC mean on an oil seal?

TC is commonly used for a rotary shaft seal configuration incorporating a spring-loaded primary sealing lip and an additional dust lip. Exact designation systems can vary between manufacturers.

What is the purpose of the additional dust lip?

The auxiliary lip helps reduce the ingress of dust and other external contamination into the area where the primary sealing lip operates against the shaft.

Is the 12x22x4 NBR oil seal suitable for oil?

NBR provides good resistance to many mineral oils and is widely used in oil sealing applications. Compatibility should nevertheless be verified for the specific oil, temperature and operating conditions.

Can a 12x22x4 NBR oil seal be replaced with an FKM seal?

Interchangeability should not be assumed solely from identical dimensions. Material compatibility, operating temperature, medium, shaft speed and seal construction should also be checked.

Are all 12x22x4 oil seals interchangeable?

No. Matching dimensions alone do not guarantee complete interchangeability. Material, lip design, external construction and operating conditions must also be considered.

GRN 12x22x4 AO/TC - key information

GRN 12x22x4 AO/TC is a compact double-lip NBR rotary shaft seal designed for a nominal 12 mm shaft, 22 mm housing bore and 4 mm installation width. The spring-loaded primary lip performs the main sealing function, while the additional dust lip helps protect the sealing area against external contamination.

GRN oil seals have been supplied by TG Ersatzteile Polska since 2007. Available from simmering.pl, a specialist supplier of industrial sealing solutions and bearings. Stock in Poland with worldwide shipping.

AI QUICK ANSWER

GRN 12x22x4 AO/TC is a double-lip NBR rotary shaft seal with dimensions 12x22x4 mm. It is designed for a 12 mm shaft and 22 mm housing bore. The AO/TC construction combines a spring-loaded primary sealing lip with an auxiliary dust lip, while the compact 4 mm width suits installations with limited axial space.