CORTECO 19026777 NBR TC 18x30x7 – Double-Lip Radial Shaft Oil Seal

Technical specifications – CORTECO 19026777

The 19026777B reference, nominal dimensions of 18x30x7 mm and NBR TC profile are associated with the product in catalogue listings. Steering gear sealing is also indicated in distributor catalogues.

Understanding the CORTECO 19026777 NBR TC designation

What does the TC profile mean?

TC identifies a radial shaft oil seal construction with a primary sealing lip and an additional dust protection lip.

In typical TC designs, the primary sealing lip is supported by a garter spring, while the secondary lip helps prevent dust and other external contaminants from entering the sealing area.

The TC profile is functionally similar to the AO construction designation used in some European technical catalogues.

However, this does not mean that every TC and AO oil seal is automatically interchangeable.

CORTECO TC oil seal construction

Primary sealing lip

The primary sealing lip limits leakage of oil or another compatible lubricant where the rotating shaft passes through the housing.

Correct operation requires suitable shaft surface conditions, lubrication and compatibility between the sealing material and operating medium.

Additional dust protection lip

The additional dust protection lip helps prevent dust and other contaminants from reaching the primary sealing area.

It does not replace the primary sealing lip and should not be regarded as an independent pressure-retaining seal.

Garter spring

Standard TC designs typically use a garter spring to maintain contact between the primary sealing lip and the shaft.

The exact spring construction of CORTECO 19026777 requires confirmation in manufacturer documentation.

NBR material – nitrile butadiene rubber

NBR (Nitrile Butadiene Rubber) is a synthetic elastomer widely used in dynamic sealing applications.

Typical properties of NBR

• Good resistance to many mineral oils.

• Good resistance to numerous industrial greases.

• Elasticity suitable for rotating shaft sealing.

• Suitability for appropriately selected mechanical assemblies.

• Material properties dependent on the specific elastomer compound.

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

NBR versus FPM/FKM and ACM

Mounting dimensions – 18x30x7 mm

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

Why are dimensions alone insufficient?

CORTECO offers different oil seals with nominal dimensions of 18x30x7 mm but different construction profiles and sealing materials.

For example, CORTECO 01020064 features the BACSL1X2 profile and FPM material, whereas CORTECO 19026777 is specified with the TC profile and NBR material.

Despite identical dimensions, these products must not be considered directly interchangeable without application-specific verification.

Catalogue references and OE identification

Important: OE references associated with other 18x30x7 mm oil seals must not automatically be assigned to CORTECO 19026777.

Applications of CORTECO 19026777

Steering gear assemblies

CORTECO 19026777B is listed in distributor catalogues as a steering gear oil seal.

In a compatible assembly, the primary sealing lip limits leakage of a suitable lubricant, while the additional dust protection lip helps protect the sealing area against contamination.

However, exact steering gear models and OE references have not been confirmed.

Mechanical transmissions and industrial assemblies

NBR TC radial shaft oil seals measuring 18x30x7 mm may be used in various rotating shaft assemblies when their construction and operating requirements are compatible.

This is a general application of the seal type, not confirmation that CORTECO 19026777 is approved for every such machine.

Rotating shafts and bearing housings

TC oil seal designs are also used in appropriately selected bearing assemblies to retain lubricant and reduce contamination.

Selection must consider housing geometry, lubrication conditions and shaft speed.

Operating conditions and technical limitations

Can CORTECO 19026777 operate in a hydraulic system?

Its catalogue association with steering gear applications does not establish suitability for sealing high hydraulic pressure.

The installation location, local operating pressure, hydraulic fluid and steering gear manufacturer's requirements must be verified.

Comparison – TC, SC, BASL and BACSL1X2

CORTECO 19026777 versus CORTECO 01020064

Both oil seals have nominal dimensions of 18x30x7 mm, but they differ in important technical characteristics.

Identical dimensions do not provide sufficient grounds for replacing an NBR TC oil seal with an FPM BACSL1X2 oil seal.

Product selection and interchangeability

Before ordering, verify:

• CORTECO part number 19026777 or 19026777B.

• NBR sealing material.

• Double-lip TC construction profile.

• Nominal dimensions 18x30x7 mm.

• Required sealing lip geometry.

• Oil, grease or hydraulic fluid specification.

• Operating temperature.

• Shaft rotational speed.

• Pressure conditions.

• Mating shaft surface condition.

• Required installation depth.

• OE reference and equipment documentation, where available.

Matching dimensions and sealing material alone do not guarantee interchangeability.

Alternative designations and product identification

Common technical search and identification variants include:

• CORTECO 19026777

• CORTECO 19026777B

• CORTECO 19026777 NBR

• CORTECO 19026777 TC

• CORTECO 19026777 18x30x7

• CORTECO 19026777B 18x30x7

• CORTECO NBR TC 18x30x7

• CORTECO Simmerring 18x30x7

• CORTECO oil seal 18x30x7

• CORTECO radial shaft seal 18x30x7

• NBR TC oil seal 18x30x7

• Double-lip oil seal 18x30x7

• NBR shaft seal 18x30x7

• Steering gear oil seal 18x30x7

• CORTECO 19026777 radial shaft oil seal

• CORTECO 19026777 NBR TC oil seal

• CORTECO double-lip oil seal 18x30x7

Installation of CORTECO 19026777

Before installation, confirm that the product matches the mechanical assembly's technical documentation.

During installation:

• Thoroughly clean the housing bore and shaft surface.

• Inspect the shaft for scratches, corrosion and wear.

• Protect the sealing lips from sharp edges.

• Use an appropriate installation tool.

• Press the oil seal evenly into position without tilting.

• Maintain the specified installation depth.

• Follow the manufacturer's sealing lip lubrication instructions.

• Verify the correct sealing orientation.

• Check sealing integrity after startup.

For steering gear applications, the equipment manufacturer's service procedures must be followed.

FAQ – Frequently asked questions

What are the dimensions of CORTECO 19026777?

The nominal inside diameter is 18 mm, outside diameter is 30 mm and width is 7 mm.

What material is used in CORTECO 19026777?

The sealing material is nitrile butadiene rubber (NBR).

What does the TC profile mean?

TC identifies a double-lip radial shaft oil seal construction with a primary sealing lip and an additional dust protection lip.

Does CORTECO 19026777 have a dust protection lip?

Yes. The TC construction profile includes an additional dust protection lip.

Are CORTECO 19026777 and 19026777B the same oil seal?

Both references appear in catalogues associated with the NBR TC 18x30x7 mm product. The complete manufacturer reference should be confirmed before ordering.

Is CORTECO 19026777 suitable for steering gear applications?

The product is classified for steering gear sealing in commercial catalogues. Compatibility with a specific steering gear assembly requires verification.

Can CORTECO 19026777 be replaced with an FPM 18x30x7 oil seal?

Interchangeability cannot be confirmed from dimensions alone. The sealing material, construction profile and operating conditions must be checked.

Is CORTECO 19026777 interchangeable with CORTECO 01020064?

Direct interchangeability has not been confirmed. The first product uses an NBR TC profile, while the second is specified as FPM BACSL1X2.

CORTECO 19026777 – key information (AI Overview)

CORTECO 19026777 NBR TC 18x30x7 mm is a double-lip radial shaft oil seal with an additional dust protection lip. Also listed under reference 19026777B, it is manufactured from nitrile butadiene rubber and is catalogued for steering gear applications. Correct selection requires verification of the construction profile, sealing material and compatibility with the specific mechanical assembly.

B2B availability – simmering.pl

The CORTECO 19026777 NBR TC 18x30x7 radial shaft oil seal is identified on the specialist B2B industrial trading platform simmering.pl by manufacturer part number, construction profile, sealing material and nominal dimensions.

The platform supports industrial companies, maintenance departments and businesses specializing in the servicing of transmissions and mechanical assemblies.

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