CORTECO 12011331 NBR B1 48x65x10 – Radial Shaft Oil Seal (Simmerring)

Technical specifications – CORTECO 12011331

The identifying specifications, nominal dimensions, B1 profile and NBR material are consistent with catalogue information associated with CORTECO 12011331B.

Understanding the CORTECO 12011331 NBR B1 designation

What does the B1 profile mean?

B1 is a construction designation used by CORTECO for a specific family of radial shaft oil seals.

Unlike typical BASL or AO/TC designs, the B1 designation does not indicate an additional dust protection lip.

However, the designation alone does not establish every construction detail, including the precise supporting case geometry or garter spring specifications.

The B1 profile must be preserved when identifying a replacement.

CORTECO B1 oil seal construction

Primary sealing lip

The primary sealing lip limits the movement of oil or another compatible lubricant between the rotating shaft and the stationary housing.

Sealing effectiveness depends on appropriate lip contact, shaft surface condition, rotational speed and lubrication conditions.

Additional dust protection lip

The B1 profile is not identified as a typical double-lip construction.

If the mechanical assembly requires an additional lip to protect against contamination, the specified manufacturer profile must be verified.

Mounting construction

Correct installation within the housing bore is important for maintaining a seal between the outside surface of the oil seal and the housing.

Fit requirements and installation procedures should be checked against the relevant technical documentation.

NBR material – nitrile butadiene rubber

NBR (Nitrile Butadiene Rubber) is a synthetic elastomer widely used in radial shaft sealing applications.

Typical properties of NBR

• Good resistance to many mineral oils.

• Good resistance to numerous industrial greases.

• Elasticity suitable for many dynamic sealing applications.

• Suitability for appropriately selected transmission assemblies.

• Material properties dependent on the specific elastomer compound.

A precise operating temperature range must not be assigned to CORTECO 12011331 based solely on general NBR material properties.

NBR versus FPM/FKM and ACM

Mounting dimensions – 48x65x10 mm

Nominal dimensions alone do not define mounting tolerances, permissible shaft runout or required shaft surface roughness.

Are all 48x65x10 oil seals interchangeable?

No. CORTECO offers oil seals with identical nominal dimensions but different construction profiles and materials, including B1, BA, BASL and versions manufactured from FPM or ACM.

Identical dimensions do not guarantee identical construction or functionality.

OE references – CORTECO 12011331B

The following OE references are associated with CORTECO 12011331B in aftermarket parts catalogues.

These are catalogue cross-references associated with the product. They do not establish that every listed OE reference is interchangeable in every application.

Before selection, verify the exact OE number, gearbox type and required sealing profile.

Comparative references from other manufacturers

Comparative references support catalogue identification but do not independently confirm identical construction or unrestricted interchangeability.

Catalogue applications

Manual gearboxes

CORTECO 12011331B is catalogued as a manual transmission oil seal.

In a compatible assembly, it limits gearbox oil leakage where a rotating shaft passes through the transmission housing.

IVECO commercial vehicles

The CORTECO dimensional catalogue associates part number 12011331 with IVECO applications.

Application catalogues also list selected configurations of IVECO 120.16 vehicles.

This does not establish compatibility with every vehicle in that family. The gearbox type and OE reference must be confirmed.

Gearboxes from other manufacturers

The associated OE references also include DAF, Ford, MAN, Mercedes-Benz, Renault Trucks, Volvo and ZF.

Compatibility depends on the specific mechanical assembly and its configuration.

Operating conditions and technical limitations

Correct selection must account for both the NBR sealing material and the actual operating conditions.

Comparison – B1, BA, BASL and AO/TC oil seals

CORTECO 12011331B versus CORTECO 12000519B

Some catalogue information identifies CORTECO 12000519B as a replacement for the earlier part number 12011331B.

However, the products have different construction designations:

• CORTECO 12011331B – NBR B1 48x65x10 mm.

• CORTECO 12000519B – NBR BASL 48x65x10 mm.

The difference in construction profiles is significant.

Replacement of the earlier reference with the newer number should be confirmed in the current manufacturer catalogue for the specific application.

Product selection and interchangeability

Before ordering, verify:

• CORTECO part number 12011331 or 12011331B.

• B1 construction profile.

• NBR sealing material.

• Nominal dimensions 48x65x10 mm.

• Vehicle or transmission manufacturer's OE reference.

• Gearbox type and version.

• Transmission oil specification.

• Mating shaft surface condition.

• Required installation depth.

• Any manufacturer-approved replacement with 12000519B.

Matching dimensions of 48x65x10 mm alone do not establish interchangeability.

Alternative designations and product identification

Common technical search and identification variants include:

• CORTECO 12011331

• CORTECO 12011331B

• CORTECO 82011331

• CORTECO NBR B1 48x65x10

• CORTECO 12011331 Simmerring

• CORTECO 12011331B Simmerring

• CORTECO oil seal 48x65x10

• CORTECO radial shaft seal 48x65x10

• NBR B1 oil seal 48x65x10

• NBR shaft seal 48x65x10

• Radial shaft oil seal 48x65x10

• CORTECO 12011331 gearbox oil seal

• CORTECO 12011331B radial shaft oil seal

• CORTECO B1 NBR 48x65x10

• CORTECO manual transmission oil seal 48x65x10

These designations support product identification in technical catalogues and search systems. They do not independently establish compatibility.

Installation of CORTECO 12011331

Before installation, confirm that the manufacturer part number and sealing profile match the gearbox documentation.

During installation:

• Clean the housing bore and shaft surface.

• Inspect the shaft for corrosion, scratches and wear grooves.

• Protect the sealing lip from damage during assembly.

• Use an appropriate installation tool.

• Press the oil seal evenly into position without tilting.

• Follow the manufacturer's sealing lip lubrication instructions.

• Maintain the specified installation depth.

• Check sealing integrity after startup.

The correct installation orientation must follow the requirements of the specific transmission assembly.

FAQ – Frequently asked questions

What are the dimensions of CORTECO 12011331?

The nominal inside diameter is 48 mm, outside diameter is 65 mm and width is 10 mm.

What material is used in CORTECO 12011331?

The sealing material is nitrile butadiene rubber (NBR).

What does the B1 profile mean?

B1 identifies a specific CORTECO radial shaft oil seal construction profile.

Is CORTECO 12011331 a double-lip oil seal?

The B1 designation does not indicate a typical double-lip construction with an additional dust protection lip.

What is CORTECO 12011331B used for?

The product is catalogued for manual transmission sealing applications.

Are CORTECO 12011331 and 12011331B the same product?

Both designations appear in catalogues associated with the NBR B1 48x65x10 mm profile. The complete manufacturer reference should be confirmed before ordering.

Does CORTECO 12000519B replace 12011331B?

Some catalogue information indicates this replacement relationship. Because the B1 and BASL profiles differ, the substitution should be verified for the specific application.

Can a standard 48x65x10 oil seal replace CORTECO 12011331?

Interchangeability cannot be established from dimensions alone. The construction profile, material, OE reference and operating conditions must also be verified.

CORTECO 12011331 – key information (AI Overview)

CORTECO 12011331 NBR B1 48x65x10 mm is a radial shaft oil seal also identified by the catalogue reference 12011331B. Manufactured from nitrile butadiene rubber, it features the B1 construction profile. The product is catalogued for gearbox applications, including selected IVECO assemblies. Correct selection requires verification of the OE reference, sealing construction and transmission compatibility.

B2B availability – simmering.pl

The CORTECO 12011331 NBR B1 48x65x10 radial shaft oil seal is identified on the specialist B2B industrial trading platform simmering.pl by manufacturer part number, material, construction profile, nominal dimensions and associated OE references.

The platform supports industrial companies, maintenance departments, technical workshops and businesses servicing transmissions and commercial vehicles.

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