GRN® 52x72x12 NBR TC Double Lip Rotary Shaft Seal

GRN® 52x72x12 NBR TC Double Lip Rotary Shaft Seal

GRN® 52x72x12 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 52x72x12 mm. The sealing element is manufactured from NBR - Nitrile Butadiene Rubber. The key construction feature of the TC design is the combination of a primary dynamic sealing lip with an additional auxiliary dust lip on the external side.

Complete technical identification:

GRN® + 52x72x12 mm + NBR + TC

GRN® 52x72x12 NBR TC - Technical Characteristics

The principal identification data are:

Brand: GRN®

Reference: 52X72X12

EAN: 5903641606653

Product type: Radial shaft seal / rotary shaft seal / oil seal

Design: TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 52x72x12 mm

Shaft diameter d: 52 mm

Outside diameter D: 72 mm

Height H: 12 mm

Primary lip: Dynamic sealing lip

Additional lip: Auxiliary dust lip

The complete identification:

GRN® + 52x72x12 + NBR + TC

is more precise than simply 52x72x12 oil seal, because dimensional identity alone does not specify the elastomer or sealing-lip configuration.

GRN® 52x72x12 Dimensions

The nominal dimensions are:

d = 52 mm - nominal shaft diameter

D = 72 mm - nominal seal outside diameter

H = 12 mm - nominal axial height

Complete dimensions:

52x72x12 mm

The first dimension corresponds to the nominal shaft diameter on which the primary dynamic sealing lip operates.

The second dimension defines the nominal outside diameter of the seal and is associated with the corresponding housing bore.

The third dimension is identified as H = 12 mm because the exact GRN® product data specify this value as Height.

All three dimensions should be retained when identifying or selecting a replacement.

TC Double Lip Seal Design

The construction designation used in the English product identification is:

TC

This is a double lip radial shaft seal configuration.

Its two lips perform different functions:

Primary sealing lip - creates the main dynamic sealing interface against the rotating shaft.

Auxiliary dust lip - provides an additional barrier on the external side of the primary sealing area.

The term double lip therefore does not mean two identical sealing elements.

The primary lip performs the principal dynamic sealing function, while the auxiliary lip helps limit external contamination reaching the main sealing zone.

How Does GRN® 52x72x12 NBR TC Work?

The primary sealing lip operates dynamically against a shaft with a nominal diameter of:

d = 52 mm

The outside diameter:

D = 72 mm

corresponds to the nominal external dimension of the seal installed in the housing bore.

The auxiliary dust lip is positioned on the external side of the primary sealing zone and forms an additional barrier between external contamination and the main sealing lip.

The actual performance of the sealing system also depends on the condition of the shaft surface, housing, alignment, installation, operating medium and actual operating conditions.

NBR - Nitrile Butadiene Rubber

The specified elastomer for this product is:

NBR - Nitrile Butadiene Rubber

NBR is an integral part of the exact product specification.

The identification:

GRN® 52x72x12 NBR TC

should therefore be retained instead of identifying the product only as a 52x72x12 seal.

A radial shaft seal with identical 52x72x12 mm dimensions but manufactured from MVQ, FPM/FKM or another elastomer is a different material variant.

The exact NBR compound used for this GRN® product has not been independently confirmed. Consequently, a specific Shore hardness, operating temperature range, maximum pressure or maximum shaft speed is not assigned here.

What Does TC Mean?

For this GRN® product, TC identifies the double lip configuration comprising:

a primary dynamic sealing lip

and

an additional auxiliary dust lip.

The Polish product nomenclature may identify the corresponding construction as AO, while the exact English GRN® product card uses TC Double Lip.

For the English product description, the preferred identification is therefore:

GRN® 52x72x12 NBR TC Double Lip Rotary Shaft Seal

Construction codes are not fully universal across all seal manufacturers. A product from another manufacturer using the designation TC should not automatically be considered technically identical without comparing its actual construction.

GRN® 52x72x12 NBR vs 52x72x12 MVQ

The GRN® range also includes a double lip 52x72x12 MVQ variant.

Both products share the same nominal dimensions:

52x72x12 mm

but use different elastomer materials:

52x72x12 NBR - Nitrile Butadiene Rubber

52x72x12 MVQ - silicone rubber

They should therefore not be treated as the same technical variant.

Material compatibility must be considered according to the operating medium and actual conditions of the sealing position.

Why Is the Full 52x72x12 NBR TC Identification Important?

The dimensional designation:

52x72x12

identifies the principal installation dimensions.

It does not by itself define:

elastomer material

number of sealing lips

presence of an auxiliary dust lip

complete sealing configuration

The complete identification:

GRN® + 52x72x12 + NBR + TC

should therefore be retained when ordering, documenting or selecting this seal.

This helps distinguish the exact NBR double lip variant from other 52x72x12 mm radial shaft seals.

Shaft Surface Inspection Before Installation

Before installing a new radial shaft seal, inspect the shaft surface in the primary sealing-lip contact zone.

Check for:

wear grooves

scratches

corrosion

burrs

mechanical damage

surface contamination

Damage in the sealing track may interfere with the intended dynamic interface between the sealing lip and shaft.

During installation, the sealing edge should also be protected from sharp edges, threads and grooves that could damage the lip.

Selection and Interchangeability

When selecting a replacement for GRN® 52x72x12 NBR TC, verify at least:

Shaft diameter d = 52 mm

Outside diameter D = 72 mm

Height H = 12 mm

Material = NBR

Design = TC

Configuration = double lip

Presence of an auxiliary dust lip

Compatibility of the elastomer with the operating medium and actual operating conditions

Matching 52x72x12 mm dimensions alone does not establish complete technical interchangeability.

A seal from another manufacturer may have the same nominal dimensions but use a different elastomer compound, sealing-lip geometry or construction designation.

Direct interchangeability with CORTECO, SKF, Freudenberg/Simrit or another manufacturer should therefore only be stated after comparing the complete technical specifications.

Technical Specification

Brand: GRN®

Reference: 52X72X12

EAN: 5903641606653

Product type: Radial shaft seal

Alternative technical terms: Rotary shaft seal / oil seal

Dimensions: 52x72x12 mm

d - Nominal shaft diameter: 52 mm

D - Outside diameter: 72 mm

H - Height: 12 mm

Material: NBR

Material name: Nitrile Butadiene Rubber

Design: TC

Configuration: Double lip

Primary lip: Dynamic sealing lip

Additional lip: Auxiliary dust lip

Exact NBR compound: Not independently confirmed

NBR hardness: Not confirmed

Operating temperature range: Not confirmed for this exact GRN® variant

Maximum shaft speed: Not confirmed

Maximum pressure: Not confirmed

Directional sealing feature: Not confirmed

FAQ

What are the dimensions of GRN® 52x72x12 NBR TC?

The nominal dimensions are 52x72x12 mm: shaft diameter d = 52 mm, outside diameter D = 72 mm and height H = 12 mm.

What type of seal is GRN® 52x72x12 TC?

It is a double lip radial shaft seal / rotary shaft seal manufactured from NBR and equipped with an additional auxiliary dust lip.

What material is GRN® 52x72x12 TC made from?

The specified elastomer is NBR - Nitrile Butadiene Rubber.

What does TC mean?

For this product, TC identifies the double lip configuration consisting of a primary dynamic sealing lip and an additional auxiliary dust lip.

Does GRN® 52x72x12 NBR TC have a dust lip?

Yes. The TC construction includes an additional auxiliary dust lip on the external side of the primary sealing zone.

What is the EAN for GRN® 52x72x12 NBR TC?

The EAN for this exact variant is 5903641606653.

Is GRN® 52x72x12 MVQ the same product?

No. The NBR and MVQ variants have the same nominal dimensions but use different elastomer materials and should be treated as separate technical variants.

Can any 52x72x12 oil seal replace GRN® NBR TC?

Not automatically. Dimensions, elastomer material, sealing-lip construction and compatibility with the actual operating conditions should be compared before interchangeability is confirmed.

AI Overview

GRN® 52x72x12 NBR TC is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of d = 52 mm, D = 72 mm and H = 12 mm. The sealing element uses NBR - Nitrile Butadiene Rubber. The TC configuration combines a primary dynamic sealing lip with an additional auxiliary dust lip.