GRN® 17x25x4 NBR TC Double Lip Rotary Shaft Seal

GRN® 17x25x4 NBR TC Double Lip Rotary Shaft Seal

GRN® 17x25x4 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 17x25x4 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: 17 mm

D: 25 mm

B: 4 mm

Complete product identification:

GRN® + 17x25x4 mm + NBR + TC

GRN® 17x25x4 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: 17x25x4 mm

Shaft diameter d: 17 mm

Outside diameter D: 25 mm

Width B: 4 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

For precise identification, retain:

GRN® + 17x25x4 + NBR + TC

GRN® 17x25x4 Dimensions

The nominal installation dimensions are:

d: 17 mm - nominal shaft diameter

D: 25 mm - nominal outside diameter / housing bore diameter

B: 4 mm - nominal axial width

Complete dimensions:

17x25x4 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 corresponding housing bore.

The third dimension specifies the nominal axial width.

The complete 17x25x4 mm dimension should always be retained 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 construction 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® 17x25x4 TC Seal Work?

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

17 mm

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

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

The primary and auxiliary lips perform separate functions: 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 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:

17x25x4 + 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 therefore 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 17x25x4 NBR TC Mean?

The designation can be interpreted as follows:

17 - nominal shaft diameter in mm

25 - nominal outside diameter in mm

4 - nominal axial width in mm

NBR - Nitrile Butadiene Rubber

TC - double lip seal design

GRN® - product brand

Complete identification:

GRN® + 17x25x4 + NBR + TC

Why Is the 17 mm Shaft Diameter Important?

For this product:

d: 17 mm

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

A shaft seal with a 16 mm, 18 mm or another nominal bore should not be treated as dimensionally equivalent even if its outside diameter is similar.

The complete:

17x25x4 mm

dimension is required for accurate identification.

Why Is the 25 mm Outside Diameter Important?

The nominal outside diameter is:

D: 25 mm

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

A radial shaft seal designed for a 17 mm shaft may be available with different outside diameters.

Matching the shaft diameter alone is therefore insufficient.

Both:

d: 17 mm

and

D: 25 mm

must be verified.

Why Is the 4 mm Width Important?

The nominal axial width is:

B: 4 mm

This is particularly important because 4 mm is part of the exact dimensional specification.

The product should therefore be identified as:

17x25x4 mm

and not simply:

17x25 mm

A 17x25 mm shaft seal with a different axial width represents a different dimensional variant.

GRN® 17x25x4 vs Other 17x25 Shaft Seals

Two seals can share:

d: 17 mm

and

D: 25 mm

while differing in:

axial width

material

lip configuration

hydrodynamic features

or

manufacturer-specific construction

For this reason, the full technical identification should be retained:

GRN® + 17x25x4 + NBR + TC

The 4 mm width should not be omitted when searching for a replacement.

Selection and Interchangeability

When selecting a replacement for GRN® 17x25x4 NBR TC, verify at least:

• Shaft diameter d: 17 mm
• Outside diameter D: 25 mm
• Width B: 4 mm
• Material: NBR
• Design: TC
• Configuration: Double lip
• Primary sealing lip: Spring-loaded
• Additional lip: Auxiliary dust lip

Matching the 17x25x4 mm dimensions alone does not automatically establish complete technical interchangeability.

A seal manufactured from another elastomer or using a different lip arrangement should be evaluated separately.

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

Technical Specification

FAQ

What are the dimensions of GRN® 17x25x4 NBR TC?

The nominal dimensions are 17x25x4 mm, with a 17 mm shaft diameter, 25 mm outside diameter and 4 mm axial width.

Is GRN® 17x25x4 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® 17x25x4 TC made from?

The specified material is NBR - Nitrile Butadiene Rubber.

Does GRN® 17x25x4 TC have a dust lip?

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

What does 17x25x4 mean?

It specifies a 17 mm nominal shaft diameter, 25 mm outside diameter and 4 mm axial width.

Why is the 4 mm width important?

The 4 mm axial width is part of the exact dimensional specification. A 17x25 mm seal with another width is a different dimensional variant.

Is GRN® 17x25x4 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® 17x25x4 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® 17x25x4 NBR TC is a double lip rotary shaft seal with a nominal 17 mm shaft diameter, 25 mm outside diameter and 4 mm axial width. Manufactured from NBR, the TC design combines a spring-loaded primary sealing lip with an auxiliary dust lip. The complete 17x25x4 mm dimensions are essential when selecting a replacement.