NBR Oil Seal 12x19x5 AO/TC GRN - Double Lip Rotary Shaft Seal

NBR Oil Seal 12x19x5 AO/TC GRN - Double Lip Rotary Shaft Seal

NBR Oil Seal 12x19x5 AO/TC GRN is a compact double-lip rotary shaft seal with dimensions 12x19x5 mm. Manufactured from NBR nitrile rubber, it combines a spring-loaded primary sealing lip with an additional dust lip. The seal is designed for a nominal 12 mm rotating shaft and a 19 mm housing bore, providing fluid retention while helping protect the primary sealing area against external contamination.

Technical data - GRN 12x19x5 AO/TC

Oil seal dimensions - 12x19x5 mm

The designation 12x19x5 mm defines the three principal dimensions of the seal:

12 mm - nominal shaft diameter

19 mm - nominal outside diameter / housing bore

5 mm - nominal seal width

Complete dimensions:

12x19x5 mm

The compact difference between the shaft and outside diameters makes this size suitable for small sealing arrangements where radial installation space is limited.

What does AO/TC mean?

AO/TC refers to 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

Seal profile codes are not fully standardized between all manufacturers. When replacing an AO/TC seal with another brand, the actual lip configuration and construction should therefore be compared rather than relying solely on the letter designation.

Double lip design

GRN 12x19x5 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 reduce the ingress of dust and other contamination into the primary sealing zone.

This configuration provides additional protection for the contact area between the primary sealing lip and the shaft.

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 medium, operating temperature and application conditions should always be verified.

How does the 12x19x5 oil seal work?

The outside surface of the seal is installed in a housing bore with a nominal diameter of 19 mm.

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

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

The additional dust lip helps protect the main sealing zone from contamination entering from the external environment.

AO/TC vs single lip oil seal

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

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

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

A double-lip configuration is particularly useful where the primary sealing area requires additional protection against external contamination.

NBR vs FKM/FPM

Rotary shaft seals with identical dimensions 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 temperature and chemical resistance profile.

A 12x19x5 NBR seal and a 12x19x5 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 rotary shaft seals are widely used in compact mechanical systems with rotating shafts.

Typical application areas may include:

• gearboxes

• geared motors

• small electric motors

• pumps

• industrial machinery

• production equipment

• agricultural machinery

• mechanical drive systems

• compact mechanical assemblies

• oil- and grease-lubricated mechanisms

These are typical applications of rotary shaft seals and do not confirm the suitability of GRN 12x19x5 AO/TC for a specific machine.

Alternative designations and search references

The product may also be searched for as:

Oil seal 12x19x5

NBR oil seal 12x19x5

12x19x5 NBR oil seal

12x19x5 AO oil seal

12x19x5 TC oil seal

12x19x5 AO/TC oil seal

GRN 12x19x5 oil seal

12x19x5 rotary shaft seal

12x19x5 double lip oil seal

12x19x5 oil seal with dust lip

Simmerring 12x19x5

Simmerring NBR 12x19x5

Simmerring 12x19x5 TC

Shaft seal 12x19x5

Rotary seal 12x19x5

The primary product identification is:

NBR Oil Seal 12x19x5 AO/TC GRN

Selection and interchangeability

When selecting a replacement seal, verify:

• shaft diameter 12 mm

• housing bore diameter 19 mm

• seal width 5 mm

• double-lip construction

• NBR material

• auxiliary dust lip

• operating medium

• operating temperature

• shaft rotational speed

• shaft surface condition

• pressure conditions

Matching the 12x19x5 mm dimensions alone does not guarantee complete interchangeability.

Seals with identical dimensions can differ in elastomer material, lip geometry, outside surface design and intended operating conditions.

Installation

Before installation, inspect the shaft surface and housing bore.

The shaft surface operating against the 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 12x19x5 NBR Oil Seal

What are the dimensions of the GRN 12x19x5 oil seal?

The seal is designed for a nominal 12 mm shaft, has a 19 mm outside diameter and is 5 mm wide.

What material is the 12x19x5 seal made from?

The seal is manufactured from NBR nitrile rubber.

Is 12x19x5 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 does AO mean on a rotary shaft seal?

AO is used in certain seal nomenclature systems for a design incorporating an additional dust lip. When comparing different brands, the actual seal construction should be checked.

Is the 12x19x5 NBR oil seal suitable for oil?

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

Can a 12x19x5 NBR seal be replaced with an FKM seal?

Interchangeability should not be assumed solely from identical dimensions. The operating medium, temperature, shaft speed, seal design and other operating conditions must also be verified.

Which way should the oil seal be installed?

As a general rule, the primary spring-loaded sealing lip faces the fluid or lubricant that the seal is intended to retain. The auxiliary dust lip normally faces the external environment.

GRN 12x19x5 AO/TC - key information

GRN 12x19x5 AO/TC is a double-lip NBR rotary shaft seal designed for a nominal 12 mm shaft, 19 mm housing bore and 5 mm installation width. The spring-loaded primary lip provides the main sealing function, while the additional dust lip helps protect the sealing zone 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 12x19x5 AO/TC is a double-lip NBR rotary shaft seal with dimensions 12x19x5 mm. It is designed for a 12 mm shaft and 19 mm housing bore. The seal combines a spring-loaded primary sealing lip with an auxiliary dust lip that helps protect the primary sealing area against external contamination.