GRN® 8x18x6 NBR TC Double Lip Rotary Shaft Seal

GRN® 8x18x6 NBR TC Double Lip Rotary Shaft Seal

GRN® 8x18x6 NBR TC is a double lip rotary shaft seal with nominal dimensions 8x18x6 mm. The elastomeric sealing element is manufactured from NBR – Nitrile Butadiene Rubber. The TC design incorporates a spring-loaded primary sealing lip and an auxiliary dust lip.

The key product identification is:

GRN® + 8x18x6 + NBR + TC + double lip

The complete 8x18x6 mm size is essential for correct identification. The 8 mm shaft diameter alone is not sufficient to determine the correct seal.

GRN® 8x18x6 NBR TC – Technical Characteristics

GRN® 8x18x6 Shaft Seal Dimensions

The principal nominal dimensions are:

d: 8 mm – nominal shaft diameter

D: 18 mm – nominal outside diameter / housing bore diameter

B: 6 mm – nominal axial width

Complete nominal size:

8x18x6 mm

The dimensional designation should be read as:

8 mm – shaft diameter

18 mm – outside diameter

6 mm – seal width

All three dimensions should be considered when identifying the correct rotary shaft seal.

TC Double Lip Seal Design

GRN® 8x18x6 NBR TC features a double lip construction.

The sealing system incorporates:

a primary sealing lip

supported by:

a garter spring

and:

an auxiliary dust lip.

The primary sealing lip forms the main dynamic sealing interface with the rotating shaft.

The garter spring assists in maintaining contact between the sealing edge and the shaft surface.

The auxiliary dust lip provides an additional barrier against external contamination approaching the primary sealing area.

What Does TC Mean?

For this GRN® product, TC identifies a double lip rotary shaft seal design incorporating:

a spring-loaded primary sealing lip

and:

an auxiliary dust lip.

In the Polish GRN® product nomenclature, this construction may be identified as:

AO

or:

AO/TC.

For the English product catalogue, the preferred designation is:

TC.

Therefore:

Polish: GRN® 8x18x6 NBR AO/TC

becomes:

English: GRN® 8x18x6 NBR TC

Profile codes from different manufacturers should not automatically be treated as equivalent because seal nomenclature and construction details may differ.

How Does the GRN® 8x18x6 TC Seal Work?

A radial shaft seal operates between a:

rotating shaft

and a:

stationary housing.

For this product, the nominal shaft diameter is:

8 mm

the nominal outside diameter is:

18 mm

and the nominal width is:

6 mm.

The primary sealing lip contacts the rotating shaft and creates the principal dynamic sealing interface.

The garter spring assists in maintaining the required contact between the lip and shaft surface.

The auxiliary dust lip creates an additional protective barrier on the external side of the primary sealing zone.

NBR – Nitrile Butadiene Rubber

The elastomeric sealing element is manufactured from:

NBR – Nitrile Butadiene Rubber.

NBR is a family of technical elastomers widely used in sealing applications.

However, the generic NBR designation does not identify the exact compound formulation used in this specific GRN® seal.

Without exact compound documentation, the product should not be assigned an arbitrary:

• Shore A hardness
• minimum operating temperature
• maximum operating temperature
• maximum shaft surface speed
• maximum pressure
• detailed chemical compatibility range

The operating medium and actual operating conditions should be considered when selecting the seal.

GRN® 8x18x6 vs GRN® 8x22x6

GRN® 8x18x6 and GRN® 8x22x6 share the same nominal shaft diameter and width, but their outside diameters are different.

The outside diameter differs by 4 mm.

These are separate dimensional variants and should have separate product pages for clear technical identification and SEO.

They should not automatically be treated as interchangeable.

Does TC Specify Rotation Direction?

No.

The TC designation alone does not confirm directional hydrodynamic sealing geometry.

The product should therefore not be described as:

left-hand twist

right-hand twist

or:

alternating twist

unless this characteristic has been confirmed for the exact GRN® execution.

If rotation-related sealing geometry is required for a specific application, it should be verified separately.

Selection and Interchangeability

When selecting GRN® 8x18x6 NBR TC, verify:

• shaft diameter d: 8 mm
• outside diameter D: 18 mm
• width B: 6 mm
• elastomer NBR
• TC double lip design
• spring-loaded primary sealing lip
• auxiliary dust lip
• operating medium
• operating temperature
• shaft surface speed
• pressure
• shaft surface condition
• housing bore dimensions and condition

Matching only the 8 mm shaft diameter is not sufficient to establish interchangeability.

The complete 8x18x6 mm dimensions, material and seal construction should be considered together.

Technical Specification

FAQ

What are the dimensions of the GRN® 8x18x6 NBR TC seal?

The nominal dimensions are d: 8 mm, D: 18 mm, B: 6 mm, giving the complete size 8x18x6 mm.

Is GRN® 8x18x6 a double lip shaft seal?

Yes. The TC design incorporates a primary sealing lip and an auxiliary dust lip.

Does GRN® 8x18x6 have a garter spring?

Yes. The primary dynamic sealing lip is supported by a garter spring.

Does the TC design include a dust lip?

Yes. The GRN® TC construction incorporates an auxiliary dust lip in addition to the primary sealing lip.

What does NBR mean?

NBR stands for Nitrile Butadiene Rubber, a family of technical elastomers widely used in sealing applications.

What does 8x18x6 mean?

It identifies the nominal dimensions: 8 mm shaft diameter, 18 mm outside diameter and 6 mm seal width.

Is GRN® 8x18x6 the same as GRN® 8x22x6?

No. Both have an 8 mm shaft diameter and 6 mm width, but their outside diameters differ: 18 mm versus 22 mm.

Does TC specify left-hand or right-hand rotation?

No. The TC designation alone does not confirm left-hand, right-hand or alternating hydrodynamic sealing geometry.

AI Overview

GRN® 8x18x6 NBR TC is a double lip rotary shaft seal with nominal dimensions d: 8 mm, D: 18 mm, B: 6 mm. The TC design incorporates a spring-loaded primary sealing lip and an auxiliary dust lip. The elastomeric sealing element is manufactured from NBR – Nitrile Butadiene Rubber.