GRN® 68x90x10 NBR TC Double Lip Rotary Shaft Seal

GRN® 68x90x10 NBR TC Double Lip Rotary Shaft Seal

GRN® 68x90x10 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 68x90x10 mm. The sealing element is manufactured from NBR - Nitrile Butadiene Rubber. The 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.

The complete technical identification is:

GRN® + 68x90x10 mm + NBR + TC

GRN® 68x90x10 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: 68x90x10 mm

Shaft diameter d: 68 mm

Outside diameter D: 90 mm

Width: 10 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

For precise product identification, retain:

GRN® + 68x90x10 + NBR + TC

The dimensions alone do not completely identify this seal because radial shaft seals with identical nominal dimensions may differ in material and sealing-lip configuration.

GRN® 68x90x10 Dimensions

The nominal installation dimensions are:

d = 68 mm - nominal shaft diameter

D = 90 mm - nominal seal outside diameter / housing bore diameter

Width = 10 mm - nominal axial width

Complete dimensions:

68x90x10 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 axial width of the seal.

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

TC Double Lip Seal Design

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

TC

The TC configuration is a double lip radial shaft seal design incorporating 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 external barrier protecting the primary sealing area against contamination.

The term double lip therefore does not mean that both lips perform identical sealing functions.

The primary lip provides the principal dynamic sealing interface, while the auxiliary lip acts as an additional protective barrier on the external side.

How Does the GRN® 68x90x10 TC Seal Work?

The primary sealing lip operates dynamically against a rotating shaft with a nominal diameter of 68 mm.

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

The seal outside diameter of 90 mm is installed in the corresponding stationary housing bore.

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

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

NBR - Nitrile Butadiene Rubber

The specified elastomer for this GRN® variant is:

NBR - Nitrile Butadiene Rubber

NBR is an elastomer widely used in radial shaft sealing technology.

For this product, NBR is part of the exact product specification. It should therefore be retained when identifying or selecting a replacement.

The complete identification:

68x90x10 NBR TC

is more technically precise than simply:

68x90x10 oil seal

A dimensionally identical seal manufactured from FPM/FKM or another elastomer should not automatically be considered technically equivalent.

The exact NBR compound used for this GRN® variant has not been independently confirmed. For that reason, a specific hardness, temperature range, maximum shaft speed or pressure limit is not assigned here.

What Does TC Mean?

For the English GRN® product identification, TC denotes the double lip configuration used for this seal.

It consists of:

a spring-loaded primary sealing lip

and

an additional auxiliary dust lip

This construction differentiates the product from a basic single-lip radial shaft seal.

The correct English product identification is therefore:

GRN® 68x90x10 NBR TC Double Lip Rotary Shaft Seal

rather than a generic description based only on its dimensions.

GRN® 68x90x10 TC vs Single Lip Seal

A radial shaft seal with the same 68x90x10 mm dimensions may use a different lip configuration.

The defining construction feature of the TC variant is:

spring-loaded primary sealing lip + auxiliary dust lip

A single-lip version does not have the additional auxiliary dust lip characteristic of this double lip configuration.

Consequently, a product identified only as 68x90x10 NBR should not automatically be assumed to have the same construction as GRN® 68x90x10 NBR TC.

Shaft Surface Inspection Before Installation

Before installing a replacement radial shaft seal, the shaft surface in the primary lip contact zone should be inspected.

Check for:

wear grooves

scratches

corrosion

mechanical damage

surface contamination

A new sealing lip operating on a damaged shaft surface may not establish the intended dynamic sealing interface.

The sealing edge should also be protected from sharp edges, threads and grooves during installation to avoid damaging the lip before operation.

Selection and Interchangeability

When selecting a replacement for GRN® 68x90x10 NBR TC, verify at least:

Shaft diameter d = 68 mm

Outside diameter D = 90 mm

Width = 10 mm

Material = NBR

Design = TC

Configuration = double lip

Spring-loaded primary sealing lip

Additional auxiliary dust lip

Compatibility of the sealing material with the operating medium and actual operating conditions

Matching 68x90x10 mm dimensions alone does not establish complete technical interchangeability.

Radial shaft seals with identical dimensions may differ in elastomer, lip configuration and other construction details.

For this reason, a dimensionally identical seal from another manufacturer should not automatically be described as a direct replacement without comparing its complete technical specification.

Technical Specification

Brand: GRN®

Product type: Radial shaft seal

Alternative technical terms: Rotary shaft seal / oil seal

Dimensions: 68x90x10 mm

d - Nominal shaft diameter: 68 mm

D - Outside diameter: 90 mm

Width: 10 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 variant

Maximum shaft speed: Not confirmed

Maximum pressure: Not confirmed

Directional sealing feature: Not confirmed

FAQ

What are the dimensions of GRN® 68x90x10 NBR TC?

The nominal dimensions are 68x90x10 mm: shaft diameter d = 68 mm, outside diameter D = 90 mm and axial width = 10 mm.

What type of seal is GRN® 68x90x10 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® 68x90x10 TC made from?

The specified elastomer is NBR - Nitrile Butadiene Rubber.

What does TC mean in this GRN® shaft seal?

TC identifies the double lip configuration consisting of a spring-loaded primary sealing lip and an additional auxiliary dust lip.

Does GRN® 68x90x10 TC have a dust lip?

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

Is an FPM/FKM 68x90x10 seal the same product?

No. Identical dimensions do not make NBR and FPM/FKM variants technically identical. The sealing material is an integral part of the product specification.

Can any 68x90x10 NBR oil seal replace GRN® TC?

Not automatically. Dimensions, material, primary lip construction, additional dust lip and compatibility with the actual operating conditions should be compared.

How should a replacement for GRN® 68x90x10 NBR TC be selected?

Verify the complete 68x90x10 mm dimensions, NBR material and TC double lip construction, then confirm compatibility with the operating medium and conditions of the sealing position.

AI Overview

GRN® 68x90x10 NBR TC is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of d = 68 mm, D = 90 mm and width = 10 mm. It uses NBR - Nitrile Butadiene Rubber. The TC configuration combines a spring-loaded primary sealing lip with an additional auxiliary dust lip.