GRN® 25x40x5 NBR TC Double Lip Rotary Shaft Seal

GRN® 25x40x5 NBR TC Double Lip Rotary Shaft Seal

GRN® 25x40x5 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 25x40x5 mm. The sealing element is manufactured from NBR - Nitrile Butadiene Rubber. Its TC double lip configuration combines a spring-loaded primary sealing lip operating dynamically against the rotating shaft with an additional auxiliary dust lip on the external side.

Complete product identification:

GRN® + 25x40x5 mm + NBR + TC

GRN® 25x40x5 NBR TC - Technical Characteristics

The principal identification data are:

Brand: GRN®

Reference: 25X40X5

EAN: 5903641603171

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

Design: TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 25x40x5 mm

Shaft diameter d: 25 mm

Outside diameter D: 40 mm

Height H: 5 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

For precise identification, retain:

GRN® + 25x40x5 + NBR + TC

The dimensional designation alone does not completely identify the seal because other 25x40x5 mm radial shaft seals may use a different elastomer or sealing-lip configuration.

GRN® 25x40x5 Dimensions

The nominal dimensions are:

d = 25 mm - nominal shaft diameter

D = 40 mm - nominal seal outside diameter

H = 5 mm - nominal axial height

Complete dimensions:

25x40x5 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 height H = 5 mm for this exact GRN® product.

Using H rather than automatically assigning the third dimension to B preserves the dimensional terminology provided for the product.

All three dimensions must be checked when selecting a replacement.

TC Double Lip Seal Design

The English construction designation used for this GRN® variant is:

TC

The TC configuration incorporates two lips with different functions:

Primary sealing lip - the main dynamic sealing element operating against the rotating shaft.

Garter spring - supports radial contact between the primary sealing edge and the shaft surface.

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 lips.

The spring-loaded primary lip forms the principal dynamic sealing interface, while the auxiliary lip provides additional protection against external contamination.

How Does GRN® 25x40x5 NBR TC Work?

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

d = 25 mm

The garter spring supports contact between the primary sealing edge and the shaft surface.

The outside diameter:

D = 40 mm

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

The auxiliary dust lip is located on the external side of the main sealing area and provides an additional barrier against contaminants reaching the primary lip.

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

Therefore:

25x40x5 NBR TC

is a more precise identification than:

25x40x5 oil seal

A dimensionally identical 25x40x5 mm seal manufactured from FPM/FKM, MVQ or another elastomer should not automatically be considered the same technical variant.

The exact NBR compound used in 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 a double lip radial shaft seal configuration comprising:

a spring-loaded primary sealing lip

and

an additional auxiliary dust lip.

In the Polish product identification, the construction is listed as AO/TC. For the English technical identification, TC is used.

The preferred English designation is therefore:

GRN® 25x40x5 NBR TC Double Lip Rotary Shaft Seal

Construction codes are not completely universal between all seal manufacturers. A TC seal from another manufacturer should therefore not automatically be considered technically identical without comparing its actual construction.

Why Is the Full 25x40x5 NBR TC Identification Important?

The designation:

25x40x5

identifies the principal installation dimensions, but does not by itself define:

elastomer material

number of sealing lips

presence of an auxiliary dust lip

complete sealing configuration

The full identification:

GRN® 25x40x5 NBR TC

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

This is particularly important because radial shaft seals with identical dimensions can exist in different construction and material variants.

Shaft Surface Inspection Before Installation

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

Check for:

wear grooves

scratches

corrosion

burrs

mechanical damage

surface contamination

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

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

Selection and Interchangeability

When selecting a replacement for GRN® 25x40x5 NBR TC, verify at least:

Shaft diameter d = 25 mm

Outside diameter D = 40 mm

Height H = 5 mm

Material = NBR

Design = TC

Configuration = double lip

Spring-loaded primary sealing lip

Additional auxiliary dust lip

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

Matching 25x40x5 mm dimensions alone does not establish complete technical interchangeability.

A seal from another manufacturer may have the same nominal dimensions but a different elastomer compound, lip geometry or other construction details.

Direct interchangeability with another brand should therefore only be stated after comparing the complete technical specifications.

Technical Specification

Brand: GRN®

Reference: 25X40X5

EAN: 5903641603171

Product type: Radial shaft seal

Alternative technical terms: Rotary shaft seal / oil seal

Dimensions: 25x40x5 mm

d - Nominal shaft diameter: 25 mm

D - Outside diameter: 40 mm

H - Height: 5 mm

Material: NBR

Material name: Nitrile Butadiene Rubber

Design: TC

Configuration: Double lip

Primary sealing lip: Spring-loaded

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® 25x40x5 NBR TC?

The nominal dimensions are 25x40x5 mm: shaft diameter d = 25 mm, outside diameter D = 40 mm and height H = 5 mm.

What type of seal is GRN® 25x40x5 TC?

It is a double lip radial shaft seal / rotary shaft seal with a spring-loaded primary sealing lip and an additional auxiliary dust lip.

What material is GRN® 25x40x5 TC made from?

The specified elastomer is NBR - Nitrile Butadiene Rubber.

What does TC mean?

For this product, TC identifies the double lip configuration with a spring-loaded primary sealing lip and an additional auxiliary dust lip.

Does GRN® 25x40x5 NBR TC have a dust lip?

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

What is the EAN for GRN® 25x40x5 NBR TC?

The EAN for this exact variant is 5903641603171.

Can any 25x40x5 NBR oil seal replace this GRN® seal?

Not automatically. Dimensions, NBR material, sealing-lip construction and compatibility with the actual operating conditions should be compared.

How should a replacement for GRN® 25x40x5 NBR TC be selected?

Verify d = 25 mm, D = 40 mm, H = 5 mm, NBR material and the TC double lip construction, then confirm compatibility with the operating medium and conditions of the sealing position.

AI Overview

GRN® 25x40x5 NBR TC is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of d = 25 mm, D = 40 mm and H = 5 mm. It uses NBR - Nitrile Butadiene Rubber. The TC configuration combines a spring-loaded primary sealing lip with an additional auxiliary dust lip.