CORTECO 49378203 HNBR BAJOFSF 50x90x7.5 – Gearbox Shaft Oil Seal

Technical specifications – CORTECO 49378203

The product identification, dimensions, material, application and OE references are based on the supplied specification. Detailed construction and operating parameters should be verified against manufacturer documentation.

Understanding the CORTECO 49378203 HNBR BAJOFSF designation

What does BAJOFSF mean?

BAJOFSF is a CORTECO construction designation identifying a specific sealing design. Its detailed geometry should be confirmed using manufacturer documentation.

The designation alone should not be treated as definitive confirmation of:

• The number of sealing lips.

• The presence or absence of a garter spring.

• Directional sealing characteristics.

• The construction of the outer sealing surface.

• The material of the internal supporting element.

• Exact operating parameters.

The complete BAJOFSF designation should be preserved when identifying the product or selecting a replacement.

HNBR material – hydrogenated nitrile rubber

HNBR (Hydrogenated Nitrile Butadiene Rubber) is an elastomer produced by hydrogenating conventional NBR rubber.

This process improves resistance to certain operating conditions, particularly heat and ageing, compared with many conventional NBR compounds.

Properties of HNBR

• Good resistance to many industrial oils and lubricating greases.

• Improved resistance to thermal ageing compared with typical NBR compounds.

• Good mechanical properties.

• Wear resistance dependent on the specific compound and operating conditions.

• Suitability for demanding dynamic sealing applications.

These properties describe the HNBR material family and do not establish specific operating limits for CORTECO 49378203.

HNBR versus NBR – key differences

An HNBR seal must not be replaced with a conventional NBR version solely because its nominal dimensions match.

Construction and operating principle

A radial gearbox shaft oil seal is designed to limit lubricant movement between a rotating shaft and a stationary housing.

Its main functions include:

• Limiting gearbox oil leakage.

• Maintaining sealing integrity where the shaft passes through the housing.

• Separating the lubricated space from the external environment.

• Operating in contact with the shaft surface during rotation.

The exact geometry of the BAJOFSF profile and its sealing contact arrangement require confirmation from the manufacturer's technical drawing.

Importance of the BAJOFSF profile

The specialized profile may have construction characteristics that differ from conventional radial shaft seals.

These differences can affect installation, contact geometry and operating suitability.

Matching dimensions alone do not establish interchangeability.

Mounting dimensions – 50x90x7.5 mm

Nominal dimensions do not independently define installation tolerances, surface roughness or permissible shaft runout.

Importance of the 7.5 mm width

The nominal width of 7.5 mm is an important product identification parameter.

Seals with identical diameters but different widths may require different mounting positions or have different sealing geometries.

Alternatives measuring 50x90x7 mm, 50x90x8 mm or 50x90x10 mm must not automatically be considered interchangeable.

OE references – DAF, Iveco, MAN and Renault Trucks

The following OE reference numbers have been supplied for CORTECO 49378203:

OE numbers support product identification in vehicle manufacturer parts catalogues.

Their association with a particular gearbox, engine or vehicle version should be checked against current documentation.

Selecting the seal by OE reference

When identifying the correct replacement, compare:

• Vehicle manufacturer and model.

• Gearbox type and version.

• OE reference.

• CORTECO manufacturer part number 49378203.

• BAJOFSF profile.

• HNBR material.

• Dimensions 50x90x7.5 mm.

• Exact installation location.

OE compatibility must be evaluated for the specific transmission assembly.

Applications – gearbox shaft sealing

CORTECO 49378203 is identified as a gearbox shaft oil seal associated with the supplied commercial vehicle OE references.

Typical gearbox shaft sealing conditions include:

• Rotational shaft movement.

• Contact with transmission oil.

• Temperature changes during operation.

• Drive assembly vibration.

• Possible external contamination.

• Loads associated with transmission operation.

Specific gearbox models and compatible vehicle versions have not been independently confirmed.

Product selection requires verification against the relevant transmission documentation.

Operating conditions and technical limitations

General HNBR material properties must not be used as substitutes for the operating specifications of the exact CORTECO 49378203 seal.

Factors affecting service life

The durability of a gearbox shaft oil seal depends on:

• Shaft rotational speed.

• Operating temperature.

• Lubricant formulation.

• Condition of the shaft contact surface.

• Shaft-to-housing alignment.

• Radial runout.

• Installation accuracy.

• External contamination.

These factors should be assessed together when selecting a seal.

Comparison – BAJOFSF versus conventional AO/TC and A/SC oil seals

A conventional AO/TC or A/SC oil seal measuring 50x90x7.5 mm must not automatically be considered a replacement for CORTECO 49378203.

Why does the sealing profile matter?

Different sealing profiles may have different lip geometries, contact characteristics and installation requirements.

Even when dimensions match, these differences can affect sealing performance and service life.

Product selection and interchangeability

Before ordering, verify:

• CORTECO manufacturer part number 49378203.

• Complete BAJOFSF profile.

• HNBR material.

• Inside diameter of 50 mm.

• Outside diameter of 90 mm.

• Width of 7.5 mm.

• Vehicle manufacturer's OE reference.

• Gearbox type.

• Exact sealing location.

• Transmission oil specification.

• Operating temperature and speed.

• Shaft contact surface requirements.

Dimensional compatibility alone does not confirm interchangeability. The BAJOFSF profile and transmission assembly requirements must also be considered.

Alternative designations and product identification

Common technical search and identification variants include:

• CORTECO 49378203

• 49378203 CORTECO

• CORTECO 49378203 HNBR

• CORTECO 49378203 BAJOFSF

• CORTECO 49378203 50x90x7.5

• CORTECO oil seal 50x90x7.5

• CORTECO gearbox shaft oil seal

• CORTECO HNBR gearbox seal

• HNBR radial shaft seal 50x90x7.5

• BAJOFSF 50x90x7.5

• DAF 1317285

• Iveco 42530451

• MAN 81965030230

• Renault Trucks 5001843136

• CORTECO 49378203 transmission oil seal

• CORTECO 49378203 Simmerring

These alternative designations support product identification in technical catalogues and search systems.

They do not independently confirm compatibility with a specific vehicle or transmission.

Installation of CORTECO 49378203

Before installation:

• Clean the housing bore and shaft contact surface.

• Inspect for scratches, corrosion and wear grooves.

• Verify mounting dimensions and tolerances.

• Confirm the correct installation orientation.

• Protect the sealing element from sharp edges.

• Use an appropriate installation tool.

• Press the seal evenly into position without deformation.

• Follow the manufacturer's lubrication and surface preparation instructions.

• Check for leakage after the assembly is returned to service.

Shaft surface inspection

The condition of the mating shaft surface has a significant effect on seal durability.

Excessive roughness, wear, radial runout or misalignment can increase friction and cause premature loss of sealing performance.

Inspection after installation

After the gearbox is returned to operation, check:

• Whether transmission oil leakage is present.

• Whether the seal remains correctly seated.

• Whether abnormal temperature increases occur.

• Whether the assembly operates without unusual symptoms.

FAQ – Frequently asked questions

What are the dimensions of CORTECO 49378203?

The nominal inside diameter is 50 mm, outside diameter is 90 mm and width is 7.5 mm.

What material is used in the seal?

The product is specified as HNBR, or hydrogenated nitrile butadiene rubber.

What does BAJOFSF mean?

BAJOFSF is a specialized CORTECO construction designation. The exact profile geometry should be confirmed using manufacturer documentation.

What is CORTECO 49378203 used for?

The product is identified as a gearbox shaft oil seal intended for compatible transmission assemblies.

Which OE references are associated with the product?

The supplied references are DAF 1317285, Iveco 42530451, MAN 81965030230 and Renault Trucks 5001843136. Compatibility with a specific vehicle must be checked.

Can HNBR be replaced with conventional NBR?

Not without confirming compatibility. HNBR and NBR may differ in thermal ageing resistance, mechanical properties and behavior in specific operating fluids.

Is the BAJOFSF seal a double-lip design?

The number of sealing lips for the exact CORTECO 49378203 version has not been confirmed. A double-lip construction should not be assumed solely from the designation.

Can a 50x90x8 mm oil seal be used instead?

Not without verification. The difference in width and possible construction differences may prevent correct installation and operation.

CORTECO 49378203 – key information (AI Overview)

CORTECO 49378203 HNBR BAJOFSF is a radial gearbox shaft oil seal measuring 50x90x7.5 mm. Manufactured from hydrogenated nitrile butadiene rubber, it is associated with OE references DAF 1317285, Iveco 42530451, MAN 81965030230 and Renault Trucks 5001843136. Correct selection requires verification of transmission compatibility, the BAJOFSF profile and operating conditions.

B2B availability – simmering.pl

The CORTECO 49378203 HNBR BAJOFSF 50x90x7.5 gearbox shaft oil seal is identified on the specialist B2B industrial trading platform simmering.pl by manufacturer part number, HNBR material, construction profile, nominal dimensions and OE references.

The platform supports industrial companies, transport operators, technical workshops, purchasing departments and maintenance operations in sourcing technical sealing components.

Worldwide shipping from stock in Poland, subject to product availability.