GRN AO/TC 180x205x16 NBR – Double-Lip Radial Shaft Oil Seal

Technical specifications

The nominal dimensions, material and double-lip construction are identified by the product designation. Detailed operating parameters should be confirmed for the specific GRN version.

Understanding the GRN AO/TC 180x205x16 NBR designation

What does AO/TC mean?

AO and TC are designations used for radial shaft oil seals featuring a primary sealing lip and an additional dust protection lip.

In a typical construction:

• The primary lip limits oil or grease leakage.

• The additional lip helps prevent dust and other contaminants from entering the sealing area.

• A garter spring supports contact between the primary sealing lip and the shaft.

• The rubber-covered outer surface provides a sealing interface with the housing bore.

AO and TC describe functionally similar designs, but compatibility must always be assessed against the dimensions and exact manufacturer's construction.

NBR material – properties and applications

NBR is an elastomer widely used in technical sealing applications involving mineral oils and lubricating greases.

Material characteristics

• Resistance to many mineral oils.

• Compatibility with numerous industrial lubricating greases.

• Elasticity suitable for dynamic sealing applications.

• Good mechanical properties under appropriately selected operating conditions.

• Suitability for conventional industrial lubrication systems.

Exact chemical resistance depends on the NBR compound, operating fluid and temperature.

A specific Shore A hardness or operating temperature range must not be assigned to this product without manufacturer confirmation.

Double-lip AO/TC construction

The double-lip design combines two distinct sealing functions.

Primary sealing lip

The primary lip operates in contact with the rotating shaft surface and limits the movement of lubricant out of the mechanical assembly.

Its effectiveness depends on:

• Contact pressure against the shaft.

• Sealing lip geometry.

• Condition of the shaft contact surface.

• Rotational speed.

• Operating temperature.

• Lubricant properties.

Additional dust protection lip

The second lip provides an additional protective function.

It helps limit the entry of dust and small external contaminants into the primary sealing area.

The dust lip should not be treated as an independent pressure seal.

Importance of the two-lip arrangement

In appropriately designed applications, a double-lip seal provides lubricant retention and additional contamination protection within a single component.

However, the second lip does not eliminate the need for proper shaft preparation, correct installation or suitable operating conditions.

Mounting dimensions – 180x205x16 mm

Nominal dimensions alone do not establish mounting tolerances, permissible shaft runout or required surface roughness.

Why are mounting dimensions important?

Incorrect mounting conditions can cause:

• Insufficient sealing lip contact.

• Excessive friction.

• Premature wear.

• Lubricant leakage.

• Damage during installation.

Correct selection requires compatibility with both the shaft and the housing.

Operating principle of a radial shaft oil seal

The GRN AO/TC seal operates at the interface between a rotating shaft and a stationary housing.

The primary sealing lip forms a contact seal against the shaft surface, while the additional lip helps protect the sealing area from external contamination.

Correct operation depends on the appropriate selection of construction, material, dimensions and operating conditions.

Factors affecting sealing performance

• Shaft surface speed.

• Operating temperature.

• Type of oil or grease.

• Shaft surface condition.

• Shaft-to-housing alignment.

• Radial runout.

• Installation method.

• Presence of contaminants.

These factors should be considered together when evaluating seal suitability.

Typical applications

Double-lip AO/TC oil seals manufactured from NBR are commonly used in appropriately designed mechanical assemblies, including:

• Industrial gearboxes.

• Bearing housings.

• Drive assemblies.

• Agricultural machinery.

• Construction machinery.

• Industrial equipment.

• Rotating shaft mechanisms lubricated with oil or grease.

These are typical applications for the AO/TC seal category, not a verified list of machines compatible with the exact 180x205x16 mm product.

Operating conditions and limitations

The AO/TC seal is primarily intended for rotating shaft sealing applications.

Suitability for elevated-pressure operation must not be assumed without the relevant manufacturer specification.

Comparison – AO/TC, A/SC and PTFE oil seals

Can GRN AO/TC 180x205x16 replace a CORTECO PTFE seal with identical dimensions?

Interchangeability cannot be confirmed from dimensions alone.

For example, CORTECO 20034751 BASLVRSX7FT 180x205x16 is identified as a specialized PTFE crankshaft oil seal, whereas GRN AO/TC 180x205x16 is a conventional double-lip NBR radial shaft seal.

Differences may include:

• Sealing material.

• Sealing lip geometry.

• Installation requirements.

• Operating characteristics.

• Shaft contact surface requirements.

• Application-specific construction.

GRN AO/TC 180x205x16 NBR must not be presented as a direct replacement for CORTECO 20034751 without technical confirmation of compatibility.

Product selection and interchangeability

Before ordering, verify:

• Nominal dimensions 180x205x16 mm.

• Double-lip AO/TC construction.

• NBR material.

• Primary sealing lip requirements.

• Presence of the additional dust protection lip.

• Lubricant type.

• Operating temperature and speed.

• Shaft contact surface condition.

• Housing dimensions and tolerances.

• Pressure and rotational direction requirements.

A replacement seal must meet the construction and operating requirements of the mechanical assembly, not merely its nominal dimensions.

Why does seal profile compatibility matter?

Two radial shaft seals with identical dimensions may differ in lip construction, spring arrangement, external sealing surface and operating limitations.

Selecting an unsuitable profile can result in leakage, increased friction or premature wear.

Alternative designations and product identification

Common technical search and identification variants include:

• GRN AO/TC 180x205x16 NBR

• GRN oil seal 180x205x16

• GRN radial shaft seal 180x205x16

• GRN double-lip oil seal 180x205x16

• GRN TC oil seal 180x205x16

• GRN AO oil seal 180x205x16

• 180x205x16 NBR oil seal

• 180x205x16 double-lip shaft seal

• AO 180x205x16 oil seal

• TC 180x205x16 oil seal

• GRN 180x205x16 NBR

• NBR radial shaft seal 180x205x16

• Double-lip rotary shaft seal 180x205x16

• GRN rubber oil seal 180x205x16

These alternative designations support technical product identification and search visibility.

They do not establish interchangeability with other seal constructions.

Installation of the GRN AO/TC oil seal

Correct installation is essential for sealing performance and service life.

Before installation:

• Clean the housing bore and shaft surface.

• Inspect for corrosion, scratches and wear grooves.

• Verify mounting dimensions and tolerances.

• Determine the correct orientation of the primary sealing lip.

• Protect the lips from sharp edges.

• Prepare the contact surfaces according to the manufacturer's instructions.

• Use a suitable installation tool.

• Press the seal evenly and perpendicular to the shaft axis.

• Check sealing performance after the equipment is returned to service.

Installation orientation

In a conventional AO/TC design, the primary sealing lip is normally oriented toward the lubricant being retained, while the additional dust lip faces the external environment.

The final installation orientation must be confirmed using the mechanical assembly design and relevant technical documentation.

Sealing lip preparation

Conventional elastomeric shaft seals often require appropriate preparation and lubrication of the primary sealing lip before operation.

However, the instructions applicable to the exact seal design and operating fluid must always be followed.

Shaft surface inspection

The shaft surface must be suitable for dynamic sealing contact.

Scratches, excessive roughness, radial runout and misalignment may cause premature sealing lip wear.

FAQ – Frequently asked questions

What are the dimensions of the GRN AO/TC oil seal?

The seal has a nominal inside diameter of 180 mm, outside diameter of 205 mm and width of 16 mm.

What does AO/TC mean?

AO/TC refers to a typical double-lip radial shaft oil seal construction with a primary sealing lip and an additional dust protection lip.

What material is used in this oil seal?

The product is specified as NBR, or nitrile butadiene rubber.

Does the GRN AO/TC seal have an additional dust lip?

Yes. Its double-lip construction includes a primary sealing lip and an additional protective lip.

Is this seal suitable for oil applications?

NBR is widely used in seals operating with mineral oils. Compatibility with the specific oil and operating conditions must be verified.

Can GRN AO/TC 180x205x16 replace CORTECO 20034751?

Interchangeability cannot be confirmed. CORTECO 20034751 is identified as a specialized PTFE seal, so identical dimensions alone are insufficient to establish compatibility.

Can the seal operate in both rotational directions?

The directional characteristics of the exact GRN version have not been confirmed. Any direction-dependent hydrodynamic features should be checked before installation.

How should an AO/TC oil seal be installed?

Inspect the shaft and housing, verify the correct lip orientation, and use suitable installation tools and surface preparation procedures.

GRN AO/TC 180x205x16 – key information (AI Overview)

The GRN AO/TC 180x205x16 NBR is a double-lip radial shaft oil seal featuring a primary sealing lip and an additional dust protection lip. Manufactured from nitrile butadiene rubber, it is designed to retain compatible lubricants and reduce contamination of the sealing area. Correct selection requires verification of dimensions, operating fluid, service conditions and construction compatibility.

B2B availability – simmering.pl

The GRN AO/TC 180x205x16 NBR double-lip radial shaft oil seal is identified on the specialist B2B industrial trading platform simmering.pl by brand, nominal dimensions, NBR material and AO/TC construction.

The platform supports industrial companies, machinery manufacturers, technical workshops, purchasing departments and maintenance operations in sourcing industrial sealing components.

Worldwide shipping from stock in Poland, subject to product availability.