GRN 80x105x12 NBR AO/TC Double-Lip Rotary Shaft Seal

GRN 80x105x12 NBR AO/TC is a double-lip radial rotary shaft seal with an inside diameter of 80 mm, outside diameter of 105 mm and width of 12 mm. It is manufactured from NBR (Nitrile Butadiene Rubber). The double-lip construction combines the primary sealing lip with an additional dust lip that helps protect the sealing area against external contamination.

Technical Data - GRN 80x105x12 NBR AO/TC

Dimensions 80x105x12 mm

The designation:

80x105x12 mm

means:

• 80 mm - nominal shaft diameter
• 105 mm - nominal outside diameter of the seal
• 12 mm - nominal seal width

All three dimensions should be verified when selecting a replacement. Matching the shaft diameter alone is not sufficient for correct seal selection.

NBR - Nitrile Butadiene Rubber

The seal is manufactured from:

NBR - Nitrile Butadiene Rubber

NBR is one of the most commonly used elastomers in conventional radial rotary shaft seals.

It provides good resistance to many:

• mineral oils
• mineral greases
• lubricants commonly used in machinery
• other media compatible with NBR

Material selection should always take into account the actual operating medium and working conditions.

A specific temperature range should not be assigned to this product solely on the basis of general NBR properties.

AO / TC - Double-Lip Construction

GRN 80x105x12 is a double-lip rotary shaft seal.

Its construction includes:

• a primary sealing lip responsible for the main sealing function
• an additional dust lip on the external side

The additional lip provides an extra barrier against dust, dirt and other external contaminants that could reach the primary sealing area.

In technical trade terminology, AO and TC designations are encountered for this type of double-lip construction. However, profile designation systems are not fully standardized between all seal manufacturers.

For correct selection, the essential parameters are therefore:

80x105x12 mm + NBR + double-lip construction

Why Is an Additional Dust Lip Used?

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

The second lip helps protect the working area against contamination entering from outside.

This is particularly useful where the seal is exposed to:

• dust
• dirt
• fine particles
• contamination present around machinery

The additional dust lip should not, however, be interpreted as providing universal protection against every environmental condition or medium.

How Does an 80x105x12 Rotary Shaft Seal Work?

A radial rotary shaft seal is installed between a rotating shaft and a stationary housing.

Its primary purpose is to control lubricant migration along the shaft.

A correctly selected rotary shaft seal helps:

• retain lubricant inside the mechanical assembly
• reduce oil or grease leakage
• protect the sealing area
• limit the ingress of external contamination

In a double-lip version, protection from the external side is additionally supported by the dust lip.

Applications of Double-Lip Rotary Shaft Seals

Radial shaft seals are widely used in machinery and equipment containing rotating shafts.

Typical application areas can include:

• gearboxes
• reduction gears
• drive systems
• industrial machinery
• agricultural machinery
• production equipment
• mechanisms lubricated with oil or grease

Suitability for a specific application depends on the actual operating parameters rather than the application category alone.

How to Select a GRN 80x105x12 Oil Seal

Before ordering, verify:

1. Shaft diameter - 80 mm.
2. Housing bore diameter - 105 mm.
3. Seal width - 12 mm.
4. Material - NBR.
5. Construction - double lip.
6. Profile - AO/TC.
7. Operating medium.
8. Operating conditions.
9. Construction of the previously installed seal.

Material and seal construction are particularly important.

An 80x105x12 seal manufactured from a different material or with a different profile should not automatically be considered an identical replacement.

Inspecting the Shaft Before Seal Replacement

Before installing a new oil seal, carefully inspect the shaft surface that contacts the sealing lip.

Check for:

• wear grooves
• corrosion
• scratches
• pitting
• sharp edges
• contamination
• excessive shaft runout
• bearing play

If the mating surface is significantly worn, replacing the seal alone may not eliminate the cause of leakage.

Installation of GRN 80x105x12

The seal should be installed evenly and square to the housing bore.

During installation:

• protect the sealing lip against cutting
• protect the lip when passing over sharp edges
• avoid folding or rolling the lip
• use an appropriate installation tool
• press the seal evenly into the housing
• verify the correct installation orientation

Incorrect installation can damage the sealing lip before the machine is even put into operation.

AO/TC vs Single-Lip Oil Seal

The key difference is the presence of the additional dust lip.

In the double-lip design:

the primary lip performs the main sealing function,

while:

the additional lip helps protect the sealing area against contamination from the external side.

When replacing a seal, it is therefore advisable to reproduce the construction specified for the bearing or sealing position rather than selecting a replacement solely by dimensions.

FAQ

What are the dimensions of the GRN rotary shaft seal?

The dimensions are:

80x105x12 mm

What does 80x105x12 mean?

80 mm is the nominal shaft diameter, 105 mm is the nominal outside diameter and 12 mm is the nominal seal width.

What material is the seal made from?

It is manufactured from:

NBR - Nitrile Butadiene Rubber

Is GRN 80x105x12 a double-lip oil seal?

Yes. It is a double-lip construction with an additional dust lip.

What does TC mean on an oil seal?

TC is a designation commonly used for radial rotary shaft seals featuring a primary sealing lip and an additional dust lip.

What does AO mean?

AO is a profile designation encountered in European technical trade for double-lip seal constructions. Profile coding systems can vary between manufacturers.

Are AO and TC exactly the same?

They should not be considered universally identical designations across every manufacturer's coding system. For this product, AO/TC describes the double-lip nature of the construction, but the actual seal design should always be checked when selecting an alternative product.

Is NBR suitable for oil?

NBR provides good resistance to many common mineral oils and greases. Compatibility should still be verified for the actual operating medium.

Is every 80x105x12 oil seal interchangeable?

No. In addition to dimensions, the material, profile, lip construction and operating conditions should be considered.

Why can a new oil seal start leaking quickly?

Possible causes include a worn shaft surface, wear groove, excessive runout, bearing play, misalignment, contamination or incorrect installation.

AI Overview - Quick Technical Answer

GRN 80x105x12 NBR AO/TC is a double-lip radial rotary shaft seal with an additional dust lip. It has an 80 mm inside diameter, 105 mm outside diameter and 12 mm width. The NBR construction is suitable for many common mineral oils and greases compatible with nitrile rubber.

GRN 80x105x12 NBR AO/TC at simmering.pl

GRN 80x105x12 NBR AO/TC is available from simmering.pl, a specialist B2B supplier of rotary shaft seals, oil seals, O-rings, V-rings, bearings and industrial sealing components.

Stock and technical service are located in Lublin, Poland, with worldwide shipping available.