GRN® 25x72x7 NBR TC Double Lip Rotary Shaft Seal

GRN® 25x72x7 NBR TC Double Lip Rotary Shaft Seal

GRN® 25x72x7 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 25x72x7 mm, manufactured from NBR - Nitrile Butadiene Rubber. The TC configuration combines a spring-loaded primary dynamic sealing lip with an additional auxiliary dust lip.

Principal dimensions:

d: 25 mm

D: 72 mm

B: 7 mm

Complete product identification:

GRN® + 25x72x7 mm + NBR + TC

GRN® 25x72x7 NBR TC - Technical Characteristics

The principal identification parameters are:

Brand: GRN®

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

Design: TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 25x72x7 mm

Shaft diameter d: 25 mm

Outside diameter D: 72 mm

Width B: 7 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

For precise identification, retain:

GRN® + 25x72x7 + NBR + TC

GRN® 25x72x7 Dimensions

The nominal installation dimensions are:

d: 25 mm - nominal shaft diameter

D: 72 mm - nominal outside diameter / housing bore diameter

B: 7 mm - nominal axial width

Complete dimensions:

25x72x7 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 the corresponding housing bore.

The third dimension specifies the nominal axial width.

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

TC Double Lip Seal Design

The English design designation used for this GRN® product is:

TC

The TC configuration incorporates:

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

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

Auxiliary dust lip - provides an additional external barrier protecting the primary sealing zone against contamination.

This configuration is therefore described as a:

TC double lip radial shaft seal

TC double lip rotary shaft seal

or

TC double lip oil seal

How Does the GRN® 25x72x7 TC Seal Work?

The primary sealing lip operates dynamically against a shaft with a nominal diameter of 25 mm.

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

The auxiliary lip provides an additional barrier against contaminants entering the primary sealing zone from the external side.

The spring-loaded primary lip provides the principal dynamic sealing function, while the auxiliary lip provides additional external protection.

No left-hand or right-hand hydrodynamic direction is assigned to this exact GRN® variant because such directionality has not been confirmed.

NBR - Nitrile Butadiene Rubber

The specified sealing material is:

NBR - Nitrile Butadiene Rubber

NBR is a widely used elastomer family in radial shaft sealing technology.

For this product, the material forms part of the exact identification:

25x72x7 + NBR + TC

The NBR designation alone does not identify the exact elastomer compound used in this specific GRN® seal.

Without exact product-specific documentation, fixed values should not be assigned for:

Shore A hardness

Minimum operating temperature

Maximum operating temperature

Maximum operating pressure

Maximum rotational speed

Maximum shaft surface speed

Generic NBR operating limits should not be presented as guaranteed specifications for this exact product.

What Does 25x72x7 NBR TC Mean?

The designation can be interpreted as follows:

25 - nominal shaft diameter in mm

72 - nominal outside diameter in mm

7 - nominal axial width in mm

NBR - Nitrile Butadiene Rubber

TC - double lip seal design

GRN® - product brand

Complete identification:

GRN® + 25x72x7 + NBR + TC

Why Is the 25 mm Shaft Diameter Important?

For this product:

d: 25 mm

The primary dynamic sealing lip is designed to operate against a shaft corresponding to this nominal diameter.

Other radial shaft seals may also be designed for a 25 mm shaft while having a different outside diameter, width, material or sealing configuration.

The complete:

25x72x7 mm

dimension should therefore be used for identification.

Why Is the 72 mm Outside Diameter Important?

The nominal outside diameter is:

D: 72 mm

This dimension corresponds to the nominal housing bore for the seal.

A radial shaft seal designed for a 25 mm shaft may be manufactured with different outside diameters.

Matching the shaft diameter alone therefore does not establish dimensional interchangeability.

Why Is the 7 mm Width Important?

The nominal axial width is:

B: 7 mm

This is the third principal dimensional parameter.

The product should be identified as:

25x72x7 mm

and not simply:

25x72 mm

A 25x72 mm shaft seal with a different width represents a separate dimensional variant.

GRN® 25x72x7 vs Other 25 mm Shaft Seals

A nominal 25 mm shaft diameter alone is not sufficient to identify a radial shaft seal.

Other seals may share:

d: 25 mm

while differing in:

outside diameter

axial width

material

lip configuration

hydrodynamic features

or

manufacturer-specific profile

For this product, retain the complete technical identification:

GRN® + 25x72x7 + NBR + TC

Selection and Interchangeability

When selecting a replacement for GRN® 25x72x7 NBR TC, verify at least:

• Shaft diameter d: 25 mm
• Outside diameter D: 72 mm
• Width B: 7 mm
• Material: NBR
• Design: TC
• Configuration: Double lip
• Primary sealing lip: Spring-loaded
• Additional lip: Auxiliary dust lip

Matching the 25x72x7 mm dimensions alone does not automatically establish complete technical interchangeability.

When comparing this product with CORTECO, SKF, Simrit or another manufacturer's radial shaft seal, the actual material, lip construction, directional features and application requirements should also be verified.

Manufacturer-specific profile designations should not automatically be treated as equivalent to TC.

Technical Specification

FAQ

What are the dimensions of GRN® 25x72x7 NBR TC?

The nominal dimensions are 25x72x7 mm, with a 25 mm shaft diameter, 72 mm outside diameter and 7 mm axial width.

Is GRN® 25x72x7 TC a double lip oil seal?

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

What material is GRN® 25x72x7 TC made from?

The specified material is NBR - Nitrile Butadiene Rubber.

Does the TC design have a dust lip?

Yes. The TC configuration incorporates an additional auxiliary dust lip.

What does 25x72x7 mean?

It specifies a 25 mm nominal shaft diameter, 72 mm outside diameter and 7 mm axial width.

Can another 25x72 seal replace GRN® 25x72x7?

Direct interchangeability should not be assumed unless the 7 mm width, material, lip configuration and other relevant construction features are also compatible.

Is GRN® 25x72x7 TC directional?

No specific left-hand or right-hand hydrodynamic direction has been confirmed for this exact GRN® product.

What is the operating temperature range of GRN® 25x72x7 NBR?

An exact operating temperature range cannot be established from the NBR designation alone. It depends on the specific elastomer compound used in this GRN® product.

AI Overview

GRN® 25x72x7 NBR TC is a double lip rotary shaft seal with a nominal 25 mm shaft diameter, 72 mm outside diameter and 7 mm axial width. Manufactured from NBR, the TC design combines a spring-loaded primary sealing lip with an auxiliary dust lip. The complete 25x72x7 mm dimensions are essential when selecting a replacement.