CORTECO 12011109 15x30x7 NBR BASL Oil Seal - Carraro 025118 Rotary Shaft Seal

CORTECO 12011109 15x30x7 NBR BASL is a radial shaft oil seal designed for a 15 mm shaft, 30 mm housing bore and 7 mm installation width. The BASL design combines a spring-loaded primary sealing lip with an additional dust protection lip. Manufactured from NBR nitrile butadiene rubber, the seal is suitable for many applications involving mineral oils and lubricating greases. CORTECO 12011109 is cross-referenced with Carraro 025118 / 25118, making the OEM number an important identifier when selecting a replacement.

Technical Specifications - CORTECO 12011109

Product Type: Radial shaft seal / oil seal / Simmerring
Brand: CORTECO
Part Number: 12011109
Alternative Reference: 12011109B
Design: BASL
Dimensions: 15x30x7 mm
Material: NBR - Nitrile Butadiene Rubber
Material Specification: 72 NBR 902
Shaft Diameter d: 15 mm
Housing Bore D: 30 mm
Width B: 7 mm
Primary Sealing Lip: Spring-loaded
Auxiliary Dust Lip: Yes
DIN 3760 Design: Type AS
Carraro Reference: 025118 / 25118
EAN: 3358960039545

The product specification identifies 12011109 as a BASL 15x30x7 seal manufactured from 72 NBR 902, with a spring-loaded sealing lip and additional dust lip.

15x30x7 mm Oil Seal Dimensions

The principal installation dimensions are:

d: 15 mm - shaft diameter
D: 30 mm - housing bore
B: 7 mm - seal width

The 15x30x7 mm designation therefore identifies the basic installation geometry of the seal.

When selecting a replacement, dimensions should be checked together with the NBR material, BASL design and auxiliary dust lip.

A different 15x30x7 oil seal should not automatically be considered functionally equivalent.

BASL Double Lip Design

The BASL configuration incorporates a primary sealing lip together with an auxiliary protective lip.

The primary lip operates directly against the rotating shaft and is supported by a garter spring. Its main function is to retain lubricant and reduce leakage along the shaft.

The additional dust lip is positioned toward the external environment and helps reduce the ingress of dust, dirt and other contaminants toward the main sealing interface.

This design corresponds to DIN 3760 Type AS.

NBR 72 Nitrile Rubber

CORTECO 12011109 is manufactured from NBR nitrile butadiene rubber, with the material specification identified as 72 NBR 902.

NBR, also known as Buna-N, is widely used in industrial sealing technology because of its resistance to many:

• mineral oils
• lubricating greases
• technical lubricants
• compatible hydraulic fluids
• oil-based industrial media

Final compatibility should always be verified against the specific fluid, additives, operating temperature and service conditions.

CORTECO 12011109 and Carraro 025118

An important cross reference for this product is:

CORTECO: 12011109
CORTECO: 12011109B
Carraro: 025118
Carraro: 25118

The Carraro reference is useful when identifying the original seal in machinery and mechanical assemblies using Carraro components.

The number may appear as 025118 or without the leading zero as 25118.

When selecting the seal by OEM reference, the dimensions and seal design should also be checked against the original component.

How CORTECO 12011109 Works

During operation, the primary sealing lip remains in contact with the surface of the rotating 15 mm shaft.

The garter spring helps maintain controlled radial contact between the sealing edge and shaft surface.

The secondary dust lip provides an additional barrier on the atmospheric side of the seal.

Effective sealing also depends on:

• shaft surface condition
• shaft surface finish
• shaft alignment
• rotational speed
• operating temperature
• lubricant
• pressure conditions
• correct installation

Even a correctly selected new oil seal can leak if the shaft contact surface is worn or damaged.

Carraro Applications

The Carraro 025118 cross reference identifies CORTECO 12011109 as a replacement oil seal for appropriately specified assemblies using Carraro components.

Carraro components are widely found in drivetrain, axle and transmission systems used in industrial, agricultural and off-highway machinery.

The OEM reference should be verified against the exact machine, axle or transmission configuration before installation.

Industrial Applications

The CORTECO 12011109 NBR BASL oil seal can be used in appropriately designed:

• transmissions
• gearboxes
• drive systems
• agricultural machinery
• axle assemblies
• mechanical equipment
• industrial machinery
• Carraro-equipped assemblies
• rotating shaft systems

Application suitability depends on the operating medium, temperature, shaft speed, pressure and environmental conditions.

BASL vs Single Lip Oil Seal

The BASL design provides an additional protective lip compared with a conventional single lip radial shaft seal.

A standard single lip seal primarily performs the lubricant retention function.

The BASL design adds an auxiliary dust lip, providing another barrier between the external environment and primary sealing edge.

Therefore, another 15x30x7 seal with a different lip configuration should not automatically be treated as an equivalent replacement.

Shaft Surface Condition

The condition of the 15 mm shaft surface is important for reliable sealing.

Before installing a new CORTECO 12011109, inspect the sealing area for:

• wear grooves
• scratches
• corrosion
• pitting
• contamination
• mechanical damage

A pronounced wear groove can prevent the new sealing lip from maintaining the required contact with the shaft.

Care should also be taken when installing the seal over splines, threads, keyways or sharp edges.

How to Select a CORTECO 12011109 Replacement

Before ordering, verify:

CORTECO Number: 12011109 / 12011109B
Carraro Number: 025118 / 25118
Dimensions: 15x30x7 mm
Material: NBR
Design: BASL
Shaft Diameter: 15 mm
Housing Bore: 30 mm
Width: 7 mm
Primary Lip: Spring-loaded
Auxiliary Dust Lip: Yes

Using the part number, OEM cross reference, dimensions and construction together provides more reliable identification than selecting the seal by dimensions alone.

Operational Advantages

BASL construction: combines a spring-loaded primary sealing lip with an additional dust protection lip.

15x30x7 mm dimensions: provide clearly defined installation geometry for replacement identification.

NBR material: provides good resistance to many mineral oils and lubricating greases.

Auxiliary dust lip: helps protect the primary sealing interface against external contamination.

CORTECO 12011109 identification: enables precise product selection for maintenance, MRO and technical purchasing.

Carraro 025118 cross reference: supports identification when searching by the original Carraro part number.

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FAQ - CORTECO 12011109

What are the dimensions of CORTECO 12011109?
The seal measures 15x30x7 mm, with a 15 mm shaft diameter, 30 mm housing bore and 7 mm width.

What material is CORTECO 12011109 made from?
It is manufactured from NBR nitrile rubber. The specified material grade is 72 NBR 902.

What does BASL mean for this oil seal?
BASL identifies a radial shaft seal design with a spring-loaded primary sealing lip and an additional dust protection lip.

Does CORTECO 12011109 have a dust lip?
Yes. The BASL configuration includes an auxiliary dust protection lip.

Does the main sealing lip have a garter spring?
Yes. The primary sealing lip is spring-loaded.

What Carraro part number corresponds to CORTECO 12011109?
The relevant cross reference is Carraro 025118, which may also be written as 25118 without the leading zero.

Is CORTECO 12011109 suitable for a 15 mm shaft?
Yes. The first dimension in 15x30x7 indicates a nominal shaft diameter of 15 mm.

Frequently Asked Questions by Engineers

Is 15x30x7 mm sufficient to identify the correct replacement?
No. Material, lip design and OEM reference should also be verified. For this product, the important identifiers include NBR, BASL and Carraro 025118.

What is the difference between BASL and a standard single lip seal?
BASL includes an additional dust protection lip in addition to the spring-loaded primary sealing lip.

Are Carraro 025118 and 25118 the same reference?
The reference can appear with or without the leading zero. Both forms are used to identify this Carraro cross reference.

Can another 15x30x7 oil seal replace CORTECO 12011109?
Not automatically. Another seal may have the same dimensions but a different elastomer, lip geometry or operating characteristics.

What should be checked before installing the new seal?
Inspect the shaft for wear grooves, scratches and corrosion, verify the housing condition and ensure the sealing lip is protected from sharp edges during installation.

Is NBR compatible with every lubricant?
No. NBR is compatible with many mineral oils and greases, but compatibility should be verified for the specific fluid, additives and operating temperature.