CORTECO 12011023 NBR BA 75x105x12 Radial Shaft Seal

Technical specifications

OE cross-reference numbers

Replacement-parts catalogues associate the following original equipment references with CORTECO 12011023B.

The 38539249 reference is associated with all three vehicle brands in replacement-parts catalogues.

However, this does not establish compatibility with every vehicle manufactured by ALFA ROMEO, FIAT or LANCIA.

The original equipment reference must be checked against the specific vehicle and mechanical assembly.

CORTECO 12011023 – catalogue identification

The CORTECO dimensional catalogue identifies 12011023 – NBR BA – 75x105x12 mm.

Replacement-parts catalogues also list the designation 12011023B, while 82011023 appears as an additional commercial reference.

Available catalogue information includes:

The complete manufacturer reference, dimensions, material and sealing profile should be verified before ordering.

What does CORTECO 12011023 NBR BA 75x105x12 mean?

The product designation identifies the manufacturer, catalogue reference, dimensions, elastomer material and sealing profile.

• CORTECO – manufacturer brand.

• 12011023 – product catalogue reference.

• 75 mm – nominal shaft diameter.

• 105 mm – nominal housing bore diameter.

• 12 mm – nominal axial width.

• NBR – nitrile butadiene rubber.

• BA – radial shaft seal profile with a rubber-covered outer diameter and spring-loaded primary sealing lip.

The dimensions 75x105x12 mm describe the nominal installation geometry. They do not specify permissible shaft tolerances, housing bore tolerances or operating limits.

BA sealing profile – construction and operating principle

The BA profile is a conventional radial shaft sealing design used in rotating shaft assemblies.

Its primary function is to retain lubricant while the shaft rotates.

1. Rubber-covered outer diameter

The elastomeric outer surface provides static sealing between the seal and the housing bore.

A correctly selected interference fit helps maintain the component in position and limits leakage around its outer circumference.

The rubber covering can accommodate minor housing surface irregularities within the manufacturer's permissible tolerances.

2. Internal metal reinforcement

The metal reinforcing insert provides dimensional stability and helps maintain the shape of the seal during installation and operation.

It also supports the correct positioning of the sealing lip relative to the shaft.

3. Spring-loaded primary sealing lip

The primary sealing lip maintains contact with the rotating shaft surface.

A garter spring helps maintain the required radial contact force, supporting lubricant retention during operation.

The standard BA profile does not incorporate an additional dust lip.

Where additional protection against external contamination is required, a different sealing profile may be necessary.

NBR material properties

NBR is a synthetic elastomer produced from acrylonitrile and butadiene.

It is widely used in radial shaft seals because of its compatibility with many mineral oil-based lubricants.

Typical characteristics of appropriately selected NBR compounds include:

• Good resistance to many mineral oils.

• Compatibility with numerous industrial lubricating greases.

• Mechanical properties suitable for rotating shaft sealing.

• Application in mechanical transmissions and drive assemblies.

• Availability of different compounds for specific operating conditions.

NBR is not universally resistant to all fuels, solvents or industrial chemicals.

Its resistance to ozone and certain atmospheric influences is limited.

The exact operating temperature range, chemical compatibility and service life depend on the specific elastomer compound.

BA versus BASL – sealing profile comparison

Seals with identical nominal dimensions but different profiles should not automatically be considered interchangeable.

The correct selection depends on the housing design, operating medium, contamination exposure and installation requirements.

Selection and interchangeability

Before selecting CORTECO 12011023, verify:

1. Nominal shaft diameter – 75 mm.

2. Nominal housing bore diameter – 105 mm.

3. Installation width – 12 mm.

4. Required BA sealing profile.

5. Compatibility of NBR with the operating medium.

6. Operating temperature and shaft rotational speed.

7. Pressure within the sealed chamber.

8. Shaft surface condition and housing bore tolerances.

9. Original equipment reference 38539249.

10. Documentation for the specific mechanical assembly.

Matching dimensions alone does not guarantee interchangeability.

The replacement must also provide the required sealing profile, elastomer compatibility and operating characteristics.

Applications – ALFA ROMEO, FIAT and LANCIA

Replacement-parts catalogues associate CORTECO 12011023B with OE reference 38539249 for ALFA ROMEO, FIAT and LANCIA.

This reference supports component identification in original equipment documentation.

However, the available information does not confirm the exact installation position or compatibility with every model from these manufacturers.

Radial shaft seals with a BA profile may be used in appropriately designed:

• Mechanical transmission assemblies.

• Industrial drive systems.

• Rotating shaft mechanisms.

• Gearbox assemblies.

• Other mechanical systems requiring lubricant retention.

These are general application areas for this sealing construction rather than a confirmed vehicle fitment list for CORTECO 12011023.

Alternative designations and search references

Common English technical designations include:

• CORTECO 12011023

• CORTECO 12011023B

• CORTECO 82011023

• CORTECO 12011023 NBR BA

• CORTECO 75x105x12 NBR BA

• CORTECO 75x105x12 Oil Seal

• CORTECO 12011023 Radial Shaft Seal

• Radial Shaft Seal 75x105x12 NBR BA

• Rotary Oil Seal 75x105x12 NBR

• CORTECO Oil Seal OE 38539249

These references assist product identification but do not independently establish interchangeability.

Installation and operating recommendations

Before installation, clean the housing bore and inspect the shaft surface for corrosion, scratches, burrs and excessive wear.

The seal should be installed evenly using suitable mounting tools.

Installation force should be applied to the appropriate structural area of the seal.

Avoid applying direct pressure to the sealing lip or damaging the garter spring.

In conventional applications, the spring-loaded primary sealing lip faces the medium being retained unless the equipment documentation specifies otherwise.

Before operation, ensure appropriate lubrication at the contact area between the sealing lip and shaft.

Dry running, excessive shaft runout, unsuitable surface roughness and incorrect installation may result in premature wear and lubricant leakage.

FAQ – Frequently asked questions

1. What are the dimensions of CORTECO 12011023?

The nominal dimensions are 75x105x12 mm, corresponding to a 75 mm shaft diameter, 105 mm housing bore diameter and 12 mm axial width.

2. What does the BA sealing profile mean?

BA identifies a radial shaft seal with a rubber-covered outer diameter and spring-loaded primary sealing lip.

3. Does CORTECO 12011023 have an additional dust lip?

No. The standard BA profile does not incorporate an additional dust lip.

4. What material is used in CORTECO 12011023?

The seal uses NBR, or nitrile butadiene rubber, commonly employed in oil sealing applications.

5. Are CORTECO 12011023 and 12011023B related catalogue references?

Yes. The dimensional catalogue identifies 12011023, while replacement-parts catalogues list 12011023B for the NBR BA 75x105x12 mm seal.

6. What OE reference corresponds to CORTECO 12011023B?

The listed OE reference is 38539249, associated with ALFA ROMEO, FIAT and LANCIA.

7. Does CORTECO 12011023 fit every FIAT vehicle?

No. Compatibility must be verified using the original equipment reference and documentation for the specific vehicle.

8. Can a BASL seal replace the BA profile?

Not automatically. BASL incorporates an additional dust lip, so the replacement must meet the original application's installation and operating requirements.

CORTECO 12011023 – key information

CORTECO 12011023 / 12011023B is an NBR radial shaft seal with nominal dimensions of 75x105x12 mm and a BA sealing profile. Its construction features a rubber-covered outer diameter and spring-loaded primary sealing lip. Replacement-parts catalogues associate OE reference 38539249 with ALFA ROMEO, FIAT and LANCIA. Correct selection requires verification of the specific mechanical assembly.

The product is offered through the specialist B2B industrial trading platform simmering.pl, serving industrial companies, technical purchasing departments and maintenance operations, with worldwide shipping from stock in Poland.