CORTECO 12012408 ACM B1BASLRSX7 70x85x8 mm - Rotary Shaft Oil Seal Simmerring

Technical Specifications - CORTECO 12012408

Important technical information: CORTECO 12012408 is a directional rotary shaft seal. Its hydrodynamic sealing geometry must be compatible with the direction of shaft rotation. Matching the nominal dimensions alone does not establish interchangeability.

What Does CORTECO 12012408 ACM B1BASLRSX7 Mean?

CORTECO - Manufacturer of Rotary Shaft Seals

CORTECO is a brand associated with the Freudenberg Group, a manufacturer of sealing technologies and technical components.

The CORTECO product range includes crankshaft oil seals, camshaft seals, transmission shaft seals and other rotary sealing components.

The Simmerring designation is widely associated with radial shaft sealing technology developed within the Freudenberg group.

12012408 - Product Identification Number

The reference 12012408 identifies a specific CORTECO rotary shaft seal.

The designation 12012408B is also used in automotive aftermarket distribution catalogues.

When ordering, both the product reference and the complete construction designation B1BASLRSX7 should be verified.

ACM - Polyacrylate Rubber

ACM stands for polyacrylate rubber, an elastomer used in sealing applications involving compatible lubricating oils and elevated operating temperatures.

Its relevant characteristics include:

• Resistance to many mineral-based lubricating oils.

• Suitability for certain elevated-temperature oil sealing applications.

• Resistance to thermal ageing within the limits of the specific rubber compound.

• Elastic properties required for dynamic shaft sealing.

• Compatibility with selected automotive lubricants.

ACM is not universally resistant to all fluids.

Exposure to water, steam, fuels or aggressive chemicals requires separate compatibility assessment.

The exact operating temperature range of CORTECO 12012408 must be determined from the specifications of the particular seal compound and operating conditions. General ACM temperature ratings should not be treated as guaranteed limits for this finished product.

B1BASLRSX7 - Seal Construction Profile

B1BASLRSX7 identifies the specific CORTECO sealing construction.

The product is associated with the following design characteristics:

• Primary dynamic sealing lip.

• Additional dust exclusion lip.

• Grooved metal-elastomer outer surface.

• Left-hand directional sealing action.

The complete B1BASLRSX7 designation must be preserved.

Without the manufacturer's detailed profile documentation, individual letters should not be assigned universal meanings or interpreted using another seal manufacturer's nomenclature.

70x85x8 mm - Seal Dimensions

The nominal dimensions identify:

• 70 mm - shaft diameter.

• 85 mm - housing bore diameter.

• 8 mm - axial seal width.

These dimensions are essential for product identification but are insufficient on their own to confirm interchangeability with another rotary shaft seal.

Alternative Designations and Reference Numbers

The product may be identified under the following references:

• CORTECO 12012408

• CORTECO 12012408B

• 12012408 CORTECO

• 12012408B CORTECO

• CORTECO 82012408

• B1BASLRSX7

• CORTECO B1BASLRSX7

• CORTECO 12012408 ACM

• CORTECO Simmerring 70x85x8

• CORTECO crankshaft oil seal 70x85x8

These references should be checked against the exact seal specification before ordering.

OE Reference Numbers

The following OE references are associated with CORTECO 12012408B in automotive parts catalogues:

These references relate to particular vehicle applications. They do not establish compatibility with every engine or transmission configuration produced by the listed manufacturers.

Aftermarket Cross-References

The following references are also associated with this seal in aftermarket catalogues:

Cross-reference information should be used as an identification aid.

Before replacing the original seal, verify its material, lip geometry, directional design and compatibility with the intended application.

Construction of CORTECO B1BASLRSX7

Primary Sealing Lip

The primary sealing lip is the main functional element of the rotary shaft seal.

It maintains contact with the rotating shaft surface and helps prevent lubricating oil from escaping from the sealed housing.

Correct operation depends on the sealing lip geometry, shaft surface condition, lubrication and permissible shaft runout.

The dynamic sealing interface must maintain a controlled lubricating film during operation.

Additional Dust Lip

CORTECO 12012408 incorporates an additional dust exclusion lip.

This feature helps reduce the entry of external contaminants into the primary sealing area.

It is particularly relevant in mechanical assemblies exposed to dust, abrasive particles and general operating contamination.

The dust lip is not a substitute for the primary oil sealing lip.

Grooved Metal-Elastomer Outer Surface

The B1BASLRSX7 construction is described as having a grooved metal-elastomer outer surface.

This part of the seal provides the interface between the rotary shaft seal and the housing bore.

Correct installation requires an appropriate housing diameter, suitable surface condition and the specified installation depth.

The outer surface construction should be considered when evaluating replacement seals with identical nominal dimensions.

Left-Hand Hydrodynamic Sealing Action

CORTECO 12012408B is catalogued as a left-hand directional rotary shaft seal.

Directional hydrodynamic features are intended to assist the return of the lubricating film towards the sealed side during shaft rotation in the specified direction.

This can help control oil leakage at the dynamic sealing interface.

The direction of rotation must be checked using the viewing convention specified by the manufacturer. The term "left-hand" alone does not establish the correct installation orientation without reference to the shaft rotation and assembly geometry.

Why ACM Material Matters

A crankshaft oil seal operates in contact with lubricating oil and is exposed to changes in temperature during engine operation.

The choice of elastomer affects:

• Sealing lip flexibility.

• Resistance to thermal ageing.

• Compatibility with lubricating oil.

• Contact behaviour against the shaft.

• Resistance to wear and material degradation.

• Long-term sealing performance under the intended operating conditions.

ACM vs NBR

NBR, or nitrile butadiene rubber, is widely used in general-purpose oil sealing applications.

ACM is used in applications where resistance to certain lubricating oils and elevated operating temperatures is important.

However, an ACM seal cannot automatically replace an NBR seal simply because the dimensions are identical.

ACM vs FPM/FKM

FPM, also known as FKM, belongs to a different family of elastomers.

Fluoroelastomer seals are commonly used where particular chemical resistance and elevated-temperature capabilities are required.

Nevertheless, an FPM/FKM seal with dimensions of 70x85x8 mm is not automatically interchangeable with CORTECO 12012408 ACM.

Seal profile, directional geometry, installation conditions and the original equipment specification must also be considered.

CORTECO 12012408 vs Other 70x85x8 Oil Seals

Other CORTECO rotary shaft seals are available with the same nominal dimensions.

Although these products share nominal dimensions of 70x85x8 mm, they differ in material or construction.

They should not be considered direct replacements without checking the specific application requirements.

Why Identical Dimensions Do Not Guarantee Interchangeability

Two rotary shaft seals may have identical shaft diameter, housing diameter and width but differ in:

• Elastomer compound.

• Main sealing lip geometry.

• Dust lip construction.

• Directional hydrodynamic features.

• Outer diameter design.

• Installation requirements.

• Lubricant compatibility.

• Permissible operating conditions.

For CORTECO 12012408, the complete profile B1BASLRSX7 is therefore as important as the nominal dimensions.

Applications of CORTECO 12012408

Crankshaft Oil Seal - Transmission Side

CORTECO 12012408B is identified in automotive catalogues as a crankshaft oil seal for installation on the transmission side of the engine.

In this position, the seal helps prevent engine oil from escaping where the crankshaft passes through the engine housing.

The location is important because oil leakage may affect adjacent transmission or clutch components, depending on the vehicle's drivetrain arrangement.

Automotive Catalogue Applications

The product appears in replacement parts catalogues for selected versions of vehicles including:

• FIAT Panda

• FIAT Uno

• FIAT 127

• FIAT Fiorino

• AUTOBIANCHI Y10

• ALFA ROMEO Alfetta

• MERCEDES-BENZ 190

• FORD Sierra

• VW Transporter

This list is provided for identification purposes only.

Compatibility depends on the exact engine, production year, OE reference and installation arrangement. It must not be interpreted as confirmation that CORTECO 12012408 fits every version of these vehicles.

Selection and Interchangeability

Before ordering CORTECO 12012408, verify the following:

1. Complete CORTECO product reference 12012408 or 12012408B.

2. Full construction designation B1BASLRSX7.

3. Nominal shaft diameter of 70 mm.

4. Housing bore diameter of 85 mm.

5. Seal width of 8 mm.

6. ACM elastomer material.

7. Presence of an additional dust lip.

8. Left-hand directional sealing action.

9. Compatibility with the sealed lubricant.

10. Condition of the shaft sealing surface.

11. Required installation orientation.

12. Relevant OE number or engine manufacturer's technical documentation.

Matching dimensions of 70x85x8 mm do not guarantee complete interchangeability. Directional pumping geometry, elastomer material, sealing lip construction and outer diameter design can all affect suitability.

Installation and Operating Recommendations

Inspect the Shaft Surface

Before installation, examine the shaft surface that contacts the primary sealing lip.

The contact area should be free from deep scratches, corrosion, burrs and damage that could compromise sealing performance.

Excessive shaft wear or an established wear groove may prevent a new seal from operating correctly.

Prepare the Housing Bore

The housing bore must be clean and free from damage.

Check its dimensions, surface condition and the specified seal installation depth.

Verify Installation Orientation

Install the seal according to the technical documentation for the engine or mechanical assembly.

Correct orientation is particularly important for the directional B1BASLRSX7 profile.

Lubricate the Sealing Lip Correctly

Follow the lubrication procedure specified for the seal and application.

A conventional elastomer sealing lip should not be operated dry unless the manufacturer's installation instructions explicitly permit it.

Use Suitable Installation Tools

Press the seal evenly into the housing using an appropriate installation tool.

Avoid direct impacts on the elastomer sealing lips or damage to the outer surface.

Storage

Keep the seal in its original packaging in a clean, dry environment.

Protect it from contamination, deformation and conditions that may accelerate elastomer ageing.

Frequently Asked Questions - CORTECO 12012408

What are the dimensions of CORTECO 12012408?

The seal has an inner diameter of 70 mm, an outer diameter of 85 mm and a width of 8 mm. Its nominal dimensions are 70x85x8 mm.

What does ACM mean in CORTECO 12012408?

ACM stands for polyacrylate rubber. It is an elastomer used in oil sealing applications requiring compatibility with suitable lubricants and resistance to elevated operating temperatures.

What does B1BASLRSX7 mean?

B1BASLRSX7 identifies the specific CORTECO seal construction. It includes a primary sealing lip, an additional dust lip and left-hand directional sealing characteristics.

Does CORTECO 12012408 have a dust lip?

Yes. The seal includes an additional dust exclusion lip designed to help protect the primary sealing area from external contamination.

Is CORTECO 12012408 a directional oil seal?

Yes. The product is catalogued as a left-hand directional seal. The required shaft rotation and installation orientation must be verified before fitting.

Are CORTECO 12012408 and 12012408B the same product?

The reference 12012408 is used in CORTECO dimensional product identification, while 12012408B is used in automotive aftermarket catalogues for the ACM B1BASLRSX7 70x85x8 mm seal. The complete specification should be confirmed when ordering.

Can CORTECO 12012408 be replaced by another 70x85x8 seal?

Not automatically. The replacement must have suitable material properties, sealing lip geometry, directional characteristics and installation compatibility.

Where is CORTECO 12012408B installed?

In its identified automotive applications, it is used as a crankshaft oil seal on the transmission side of the engine. Compatibility with a particular engine must be verified using the relevant OE reference.

CORTECO 12012408 ACM B1BASLRSX7 - Key Technical Information

CORTECO 12012408 ACM B1BASLRSX7 is a radial rotary shaft oil seal measuring 70x85x8 mm, manufactured from ACM polyacrylate rubber. It features a primary sealing lip, an additional dust lip and left-hand directional sealing action. Also listed as 12012408B, it is used in specified automotive applications as a transmission-side crankshaft oil seal.

CORTECO 12012408 at simmering.pl

CORTECO 12012408 ACM B1BASLRSX7 70x85x8 mm is offered through simmering.pl, a specialist supplier of rotary shaft seals, Simmerring oil seals, rolling bearings and industrial mechanical components.

We support automotive workshops, mechanical repair specialists, maintenance departments, machinery manufacturers and industrial B2B customers.

Our warehouse and order processing operations are located in Lublin, Poland. We supply customers throughout Europe and offer worldwide shipping.