CORTECO® 12012051 BASFX7 Oil Seal | Simmerring 23x34.2/38x7.5 mm | NBR | TRW

What is the CORTECO 12012051 Oil Seal?

The CORTECO 12012051 BASFX7 is a premium radial shaft oil seal (Simmerring) manufactured from NBR (Nitrile Butadiene Rubber). It is designed to provide reliable sealing performance in steering systems operating with hydraulic fluids and lubricating oils.

This oil seal is primarily used in TRW steering gears, where precise dimensions and durable sealing performance are essential for maintaining leak-free operation.

Technical Specifications

NBR Material Advantages

NBR is one of the most widely used sealing materials in automotive and industrial applications.

Its main benefits include:

• Excellent resistance to mineral oils and greases
• Good wear resistance
• High elasticity
• Reliable sealing performance
• Good mechanical strength
• Cost-effective solution for hydraulic systems
• Long service life under recommended operating conditions

NBR is generally suitable for petroleum-based lubricants and hydraulic oils but is not recommended for prolonged exposure to ozone or high-temperature environments.

BASFX7 Seal Design

The BASFX7 profile is engineered for demanding rotary shaft sealing applications.

Its construction provides:

• Reliable lubricant retention
• Effective protection against dirt and contaminants
• Stable lip contact with the shaft
• Reduced leakage risk
• Long-term sealing performance
• Secure fit within the housing

Correct installation and proper shaft condition are essential for maximum seal life.

Typical Applications

The CORTECO 12012051 23x34.2/38x7.5 mm NBR oil seal is commonly used in:

• TRW steering gears
• Hydraulic steering systems
• Steering racks
• Automotive repair
• Industrial hydraulic equipment
• Rotary shaft sealing systems
• OEM replacement applications
• Maintenance and overhaul operations

Application in TRW Steering Systems

The CORTECO 12012051 BASFX7 oil seal is designed for compatible TRW steering gear applications.

Before installation, always verify:

• CORTECO part number
• Seal dimensions
• BASFX7 profile
• NBR material
• Shaft diameter
• Housing bore
• Installation direction
• Shaft surface condition

Matching the original specifications helps ensure proper sealing performance and service life.

Why Choose CORTECO?

CORTECO, part of the Freudenberg Group, is one of the world's leading manufacturers of automotive sealing technology.

The CORTECO 12012051 offers:

• OEM-quality manufacturing
• Precision-engineered dimensions
• Proven BASFX7 seal design
• Durable NBR sealing material
• Reliable compatibility with TRW steering systems
• Consistent long-term performance

FAQ

What are the dimensions of the seal?

The seal measures 23 mm inner diameter, 34.2 / 38 mm outer diameter, and 7.5 mm width.

What material is used?

It is manufactured from NBR (Nitrile Butadiene Rubber).

What does BASFX7 mean?

BASFX7 is CORTECO's designation for this specific radial shaft seal profile.

Where is this oil seal typically used?

It is primarily used in compatible TRW steering gear systems.

Is this an OEM-quality product?

Yes. CORTECO products are manufactured to OEM quality standards for automotive sealing applications.

Can seals with identical dimensions differ?

Yes. Lip configuration, spring design, material and operating characteristics may vary even if the dimensions are identical.

What should be checked before installation?

Always verify the shaft condition, housing dimensions, installation direction, lubrication and the original part number.

Frequently Asked Questions from Mechanics and Engineers

Is this seal suitable for steering rack rebuilding?

Yes, provided the original steering gear requires the CORTECO 12012051 BASFX7 specification.

Can an HNBR seal replace this NBR version?

Only if approved by the equipment manufacturer. HNBR and NBR have different temperature and chemical resistance characteristics.

Why does the seal have a stepped outer diameter?

The 34.2 / 38 mm outer diameter is part of the BASFX7 design, allowing the seal to fit specific steering gear housing geometries.

Should the sealing lip be lubricated before installation?

Yes. Initial lubrication is generally recommended to prevent dry running during first shaft rotation.

What causes premature seal failure?

Common causes include:

• Incorrect installation
• Damaged shaft surface
• Contamination
• Insufficient lubrication
• Excessive pressure
• Shaft misalignment
• Incorrect material selection
• Damage to the sealing lip during installation