What is the CORTECO 12000504 Oil Seal?
The CORTECO 12000504 BASL is a premium radial shaft oil seal (Simmerring) manufactured from high-quality NBR (Nitrile Butadiene Rubber). It is designed for reliable sealing of rotating shafts in manual transmissions, drivetrain assemblies and industrial power transmission systems.
Featuring the proven BASL design with an integrated dust lip, this oil seal effectively prevents lubricant leakage while protecting the system against dust, dirt and other external contaminants. It is manufactured to OEM quality standards for long service life and dependable sealing performance.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
CORTECO |
| Part Number |
12000504 |
| Seal Design |
BASL |
| Product Type |
Radial Shaft Oil Seal / Simmerring |
| Material |
NBR (Nitrile Butadiene Rubber) |
| Inside Diameter |
40 mm |
| Outside Diameter |
65 mm |
| Width |
10 mm |
| Dust Lip |
Yes |
| Typical Application |
Manual Transmission, Drivetrain |
NBR Material Advantages
NBR is one of the world's most widely used sealing materials for automotive and industrial applications.
Key advantages include:
- Excellent resistance to mineral oils
- High resistance to transmission oils and lubricants
- Good wear resistance
- Excellent elasticity
- Reliable sealing performance
- Good mechanical strength
- Long service life under recommended operating conditions
- Cost-effective sealing solution
Material compatibility should always be verified according to operating temperature, pressure and the working fluid.
BASL Seal Design
The BASL profile incorporates an additional dust protection lip, extending seal life in contaminated operating environments.
Its design provides:
- Excellent lubricant retention
- Protection against dust and dirt
- Stable sealing lip contact
- Reduced leakage risk
- High operational reliability
- Long-term sealing performance
Proper installation and shaft surface quality are essential for maximum service life.
Typical Applications
The CORTECO 12000504 40x65x10 mm oil seal is commonly used in:
- Manual transmissions
- Gearboxes
- Drivetrain assemblies
- Power transmission systems
- Agricultural machinery
- Tractors
- Commercial vehicles
- Industrial machinery
- Reduction gearboxes
- Mechanical drive systems
OEM Cross References
This oil seal corresponds to the following OEM numbers:
Massey Ferguson
- 973454M1
- 392756X1
- 3008780X1
Landini
- 973454M1
- 392756X1
- 3008780X1
Iveco
SAME
Renault Trucks
Always verify the OEM reference number and seal dimensions before ordering.
Why Choose CORTECO?
CORTECO, a member of the Freudenberg Group, is one of the world's leading manufacturers of automotive and industrial sealing technology.
The CORTECO 12000504 BASL offers:
- OEM-quality manufacturing
- Precision-engineered dimensions
- Durable NBR sealing material
- BASL dust lip design
- Excellent resistance to lubricants
- Long operational life
- Reliable sealing performance
FAQ
What are the seal dimensions?
The oil seal measures 40 mm inner diameter, 65 mm outer diameter and 10 mm width.
What material is used?
It is manufactured from NBR (Nitrile Butadiene Rubber).
What does BASL mean?
BASL is a radial shaft seal design featuring a primary sealing lip and an additional dust protection lip.
Where is this oil seal used?
It is primarily designed for manual transmissions, gearboxes and drivetrain systems.
Which vehicle manufacturers use this seal?
Compatible OEM references include Massey Ferguson, Landini, Iveco, SAME and Renault Trucks.
Is this an OEM-quality product?
Yes. CORTECO manufactures sealing products that meet original equipment quality standards.
Frequently Asked Questions from Mechanics and Engineers
Does BASL include a dust lip?
Yes. The BASL profile incorporates an additional dust lip that protects the sealing area from external contamination.
Is this oil seal suitable for manual transmissions?
Yes. It is specifically designed for manual gearbox and drivetrain sealing applications.
Is matching the dimensions sufficient?
No. Always verify the OEM number, seal profile, material, shaft condition and housing dimensions before installation.
Should the sealing lip be lubricated before installation?
Yes. Unless otherwise specified by the equipment manufacturer, applying a suitable assembly lubricant is recommended.
What causes premature oil seal failure?
The most common causes include:
- Incorrect installation
- Damaged shaft surface
- Dirt contamination
- Insufficient lubrication
- Excessive operating temperature
- Shaft misalignment
- Incorrect seal material
- Damage to the sealing lip during installation
