CORTECO 12000453 NBR BASL 18.78x30x7/6 mm - Double-Lip Rotary Shaft Oil Seal

CORTECO 12000453 NBR BASL 18.78x30x7/6 mm - Double-Lip Rotary Shaft Oil Seal

CORTECO 12000453 NBR BASL 18.78x30x7/6 mm is a radial rotary shaft seal with an inside diameter of 18.78 mm and an outside diameter of 30 mm. Manufactured by CORTECO, this oil seal features NBR (Nitrile Butadiene Rubber) sealing material and a BASL profile with a spring-loaded primary sealing lip and an additional dust lip. The specific width designation of 7/6 mm must be considered when identifying the seal and selecting a replacement.

Product Characteristics

CORTECO 12000453 is a radial shaft seal designed for use with rotating shafts in mechanical assemblies.

Its BASL construction combines lubricant retention with additional protection against external contamination.

Key features:

• Manufacturer: CORTECO.

• Product reference: 12000453.

• Inside diameter: 18.78 mm.

• Outside diameter: 30 mm.

• Width designation: 7/6 mm.

• Sealing material: NBR.

• Seal profile: BASL.

• Spring-loaded primary sealing lip.

• Additional dust protection lip.

• Rubber-covered outer case.

• Internal metal reinforcement.

• Designed for dynamic rotary shaft sealing.

Technical Specifications

Important: The original width designation of 7/6 mm has been preserved. Without the manufacturer's dimensional drawing, these values should not be interpreted as two independently confirmed installation widths or simplified to a standard 7 mm seal.

What Does CORTECO 12000453 NBR BASL 18.78x30x7/6 Mean?

The complete designation identifies the manufacturer, product reference, sealing material, construction and nominal dimensions.

CORTECO - the manufacturer's brand.

12000453 - the product identification number.

NBR - Nitrile Butadiene Rubber, a synthetic elastomer commonly used in oil seals.

BASL - a radial shaft seal profile with a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outer case.

18.78x30x7/6 mm - the dimensional designation specifying the inside diameter, outside diameter and particular width configuration.

Why Is the 18.78 mm Shaft Diameter Important?

The 18.78 mm inside diameter is less common than standard nominal shaft diameters such as 18 mm or 19 mm.

The exact dimension must be retained when selecting a replacement.

CORTECO 12000453 should not automatically be replaced with:

• An 18x30x7 mm oil seal.

• A 19x30x7 mm oil seal.

• An 18.78x30x7 mm seal with a different profile.

• Another oil seal with approximately similar dimensions.

Differences in shaft diameter, width or sealing lip geometry can affect contact pressure, sealing performance and service life.

BASL Double-Lip Construction

Primary Sealing Lip

The primary sealing lip operates in contact with the rotating shaft surface.

Its function is to help prevent oil or grease from escaping the sealed mechanical assembly.

Sealing performance depends on shaft condition, lubrication, temperature, alignment and operating speed.

Garter Spring

The primary sealing lip is supported by a circumferential garter spring.

The spring helps maintain appropriate contact between the sealing lip and the shaft under the intended operating conditions.

Additional Dust Lip

The BASL profile includes an additional dust protection lip.

This lip helps reduce the entry of dust and fine contaminants into the primary sealing area.

It provides supplementary protection but does not automatically make the seal suitable for continuous immersion or pressurized water exposure.

Rubber-Covered Outer Case

The rubber-covered outside diameter provides a sealing interface with the housing bore.

An internal metal reinforcement supports the seal and helps maintain its structural rigidity during installation and operation.

NBR Sealing Material

NBR, or Nitrile Butadiene Rubber, is widely used in industrial and automotive sealing applications.

Typical material characteristics include:

• Good resistance to many mineral oils.

• Compatibility with many mineral-based greases.

• Good mechanical properties.

• Suitability for conventional rotating shaft seals.

• Extensive use in lubricated mechanical assemblies.

Actual chemical resistance depends on the specific NBR compound, operating temperature and sealing medium.

The exact maximum temperature, shaft speed, permissible pressure and elastomer hardness should not be assumed without product-specific manufacturer specifications.

Typical Applications of BASL Oil Seals

BASL radial shaft seals are commonly used in appropriately designed mechanical assemblies, including:

• Small mechanical gearboxes.

• Speed reducers.

• Drive assemblies.

• Industrial rotating shafts.

• Lubrication systems.

• Mechanisms requiring additional dust protection.

These are general applications of BASL seal construction, not a verified list of machines compatible with CORTECO 12000453.

BASL vs BA and B1 Oil Seals

Different rotary shaft seal profiles may have similar dimensions but different construction features.

Replacing a BASL seal with another profile requires verification of operating conditions and equipment manufacturer requirements.

The same dimensions do not guarantee interchangeability.

How to Select the Correct CORTECO 12000453 Seal

Before ordering, verify:

1. CORTECO product reference 12000453.

2. Shaft diameter - 18.78 mm.

3. Housing bore diameter - 30 mm.

4. Width designation - 7/6 mm.

5. BASL profile.

6. NBR sealing material.

7. Additional dust lip requirement.

8. Rubber-covered outer case.

9. Compatibility with the sealing medium.

10. Equipment installation requirements.

For seals with non-standard dimensions, comparison with the original component and technical documentation is particularly important.

Installation Guidelines

Before installing the CORTECO 18.78x30x7/6 mm oil seal, inspect the shaft and housing bore.

Check for:

• Shaft wear grooves.

• Corrosion.

• Scratches.

• Sharp edges.

• Contamination.

• Excessive shaft runout.

• Bearing play.

• Housing bore depth and geometry.

Install the seal evenly using an appropriate mounting tool.

Avoid deforming the outer case or damaging the sealing lips.

Protect the sealing lips when passing the seal over keyways, splines or sharp shaft edges.

For conventional oil-retention applications, the primary spring-loaded lip normally faces the lubricant.

The final installation orientation must follow the equipment manufacturer's instructions.

Frequently Asked Questions

What are the dimensions of CORTECO 12000453?

The seal has an inside diameter of 18.78 mm, an outside diameter of 30 mm and a width designation of 7/6 mm.

What does 7/6 mm mean?

It is the width notation used in the product designation. The precise meaning of the individual values should be confirmed using the manufacturer's dimensional drawing.

Is CORTECO 12000453 a double-lip oil seal?

Yes. The BASL profile includes a primary sealing lip and an additional dust protection lip.

Does this oil seal have a spring?

Yes. In the conventional BASL design, the primary sealing lip is supported by a circumferential garter spring.

What material is used?

The sealing material is NBR, or Nitrile Butadiene Rubber.

Can an 19x30x7 oil seal replace this 18.78x30x7/6 seal?

Not without technical verification. Differences in diameter and width may affect sealing performance and installation compatibility.

Is the seal suitable for mineral oil?

NBR is commonly used with many mineral oils. Compatibility with the specific lubricant and operating temperature must be verified.

Does the additional lip protect against dust?

Yes. The dust lip helps reduce external contamination reaching the primary sealing area.

Can a BA oil seal replace this BASL version?

Not automatically. A standard BA seal does not include the additional dust lip found in the BASL design.

Is this seal compatible with a specific machine?

Compatibility must be verified using the original part reference and equipment documentation. Dimensions alone are insufficient to confirm fitment.

Is the outside diameter rubber-covered?

Yes. The conventional BASL construction uses a rubber-covered outer case with internal metal reinforcement.

Is the seal suitable for high-pressure applications?

The BASL designation alone does not establish a high-pressure rating. Permissible pressure must be verified using product-specific manufacturer data.

CORTECO 12000453 - Key Technical Information

CORTECO 12000453 is an NBR radial rotary shaft seal with a BASL double-lip profile. It has an inside diameter of 18.78 mm, an outside diameter of 30 mm and a width designation of 7/6 mm. Its construction includes a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered metal-reinforced case. The exact dimensional designation should be preserved when selecting a replacement.

CORTECO Rotary Shaft Seals at simmering.pl

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