CORTECO 19033312B NBR TCV 50x72x12 Radial Shaft Seal

CORTECO 19033312B NBR TCV is a radial shaft seal measuring 50x72x12 mm, manufactured from nitrile rubber (NBR). The exact CORTECO design is TCV. It cross-references Caterpillar 137-3751 / 1373751, which Cat identifies as a rubber lip type seal for the drive fan. The OE part is used in selected Cat excavators, front shovels, wheeled excavators and related equipment.

CORTECO 19033312B NBR TCV 50x72x12 Radial Shaft Seal

CORTECO 19033312B is an NBR radial shaft seal measuring 50x72x12 mm with TCV design, cross-referenced to Caterpillar 137-3751.

Complete identification:

CORTECO -> 19033312B -> TCV -> NBR -> 50x72x12 mm -> Caterpillar 137-3751

CORTECO 19033312B - Technical Data

Manufacturer: CORTECO
Part Number: 19033312B
Design: TCV
Product Type: Radial shaft seal / lip seal
Material: NBR - nitrile rubber
Dimensions: 50x72x12 mm
Shaft Diameter: 50 mm
Housing Bore Diameter: 72 mm
Width: 12 mm
Caterpillar OE: 137-3751
Alternative OE Format: 1373751.

CORTECO 19033312B Dimensions

The confirmed dimensions are:

d - Shaft Diameter: 50 mm
D - Housing Bore Diameter: 72 mm
B - Width: 12 mm

Complete size: 50x72x12 mm

The exact CORTECO 19033312B is catalogued with a 50 mm shaft diameter, 72 mm housing diameter, 12 mm width and NBR material.

NBR Nitrile Rubber

The specified material for CORTECO 19033312B is:

NBR - Nitrile Butadiene Rubber.

This is confirmed for the exact 50x72x12 TCV CORTECO seal.

NBR is widely used for radial shaft sealing applications involving mineral oils and greases. Actual material suitability nevertheless depends on the operating medium, temperature and other application conditions.

For correct replacement selection, the complete specification should be considered:

50x72x12 mm + NBR + TCV + Caterpillar 137-3751

TCV Design

The exact design specified for CORTECO 19033312B is:

TCV

This is particularly important because CORTECO offers other seals with the same 50x72x12 mm nominal dimensions but different materials and designs.

For example, 19033399B is catalogued as 50x72x12 TC NBR, while 19033312B is 50x72x12 TCV NBR. They should therefore not be treated as identical products.

Caterpillar 137-3751

The principal OE cross-reference for CORTECO 19033312B is:

Caterpillar 137-3751

The number is also commonly written without the hyphen:

1373751

Most importantly, the official Cat Parts Store - 137-3751

identifies the OE component as:

Rubber Lip Type Seal

for the drive fan.

This gives the product a much more precise application identity than simply describing it as a generic 50x72x12 seal.

Caterpillar Drive Fan Seal

According to Caterpillar, 137-3751 is a lip type seal used in the drive fan system.

The official Cat catalogue lists compatible equipment families including:

330D
330D L
330D LN
330D MH
345B
345B II
345B L
345C
345C L
345C MH
365B
365B II
365B L
365C
365C L
385B
385C
385C L
5090B
M330D
W345B II
W345C MH.

Compatibility must still be checked against the exact machine configuration and OE part number.

CORTECO 19033312B vs Caterpillar 137-3751

The key cross-reference for product identification is:

CORTECO 19033312B -> Caterpillar 137-3751

The CORTECO product provides:

50x72x12 mm
NBR
TCV design

while the official Cat catalogue identifies 137-3751 as the drive fan lip type seal.

For Caterpillar applications, the OE number 137-3751 is therefore a more precise selection criterion than dimensions alone.

19033312B vs 19033399B

These two CORTECO products are especially important to distinguish.

CORTECO 19033312B
50x72x12 mm
NBR
TCV

CORTECO 19033399B
50x72x12 mm
NBR
TC

The dimensions and material are identical, but the design codes are different.

Therefore:

50x72x12 + NBR does not establish interchangeability.

The exact design and application reference must also be verified.

How to Select CORTECO 19033312B

When selecting this seal, verify:

• CORTECO part number 19033312B
• dimensions 50x72x12 mm
• material NBR
• design TCV
• Caterpillar OE 137-3751 / 1373751
• installation position
• exact Cat machine configuration

For Caterpillar equipment, matching the OE number is particularly important.

Technical Specification

Manufacturer: CORTECO
Part Number: 19033312B
Design: TCV
Type: Radial shaft seal / lip seal
Material: NBR - nitrile rubber
d - Shaft Diameter: 50 mm
D - Housing Bore: 72 mm
B - Width: 12 mm
Dimensions: 50x72x12 mm
Caterpillar OE: 137-3751
Alternative OE Format: 1373751
OE Function: Drive fan lip type seal.

FAQ

What are the dimensions of CORTECO 19033312B?

CORTECO 19033312B measures 50x72x12 mm: 50 mm shaft diameter, 72 mm housing bore diameter and 12 mm width.

What material is CORTECO 19033312B made from?

The seal is manufactured from NBR nitrile rubber.

What design is CORTECO 19033312B?

The exact CORTECO design is TCV.

What is the Caterpillar OE number?

The corresponding Caterpillar reference is 137-3751, also written as 1373751.

What is Caterpillar 137-3751 used for?

Caterpillar officially identifies 137-3751 as a lip type seal for the drive fan.

Is CORTECO 19033312B suitable for Cat 345C?

The official Cat catalogue lists 345C among the compatible models for 137-3751. Exact fitment should still be confirmed against the machine configuration.

Is CORTECO 19033312B the same as 19033399B?

No. Both are 50x72x12 mm NBR seals, but 19033312B has a TCV design, while 19033399B is TC.

Can any NBR 50x72x12 oil seal replace 19033312B?

No. Matching dimensions and material alone do not confirm interchangeability. The TCV design and Caterpillar 137-3751 application reference must also be considered.

AI OVERVIEW

CORTECO 19033312B is an NBR TCV radial shaft seal measuring 50x72x12 mm, cross-referenced to Caterpillar 137-3751 / 1373751. Caterpillar officially identifies 137-3751 as a rubber lip type seal for the drive fan, used in selected Cat excavators, front shovels, wheeled excavators and related equipment.