GRN® 85x125x12 NBR TC Double Lip Rotary Shaft Seal

GRN® 85x125x12 NBR TC Double Lip Rotary Shaft Seal

GRN® 85x125x12 NBR TC is a double lip rotary shaft seal with nominal dimensions 85x125x12 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® + 85x125x12 + NBR + TC + double lip

The complete 85x125x12 mm dimensions are essential for correct product identification.

GRN® 85x125x12 NBR TC – Technical Characteristics

GRN® 85x125x12 Shaft Seal Dimensions

The principal nominal dimensions are:

d: 85 mm – nominal shaft diameter

D: 125 mm – nominal outside diameter / housing bore diameter

B: 12 mm – nominal axial width

Complete nominal size:

85x125x12 mm

The dimensional designation should be read as:

85 mm – shaft diameter

125 mm – outside diameter

12 mm – seal width

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

TC Double Lip Seal Design

GRN® 85x125x12 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 protective 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® 85x125x12 NBR AO/TC

becomes:

English: GRN® 85x125x12 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® 85x125x12 TC Seal Work?

A radial shaft seal operates between a:

rotating shaft

and a:

stationary housing.

For this product, the nominal shaft diameter is:

85 mm

the nominal outside diameter is:

125 mm

and the nominal axial width is:

12 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.

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

Compatibility should be evaluated according to the actual operating medium and operating conditions.

GRN® 85x125x12 vs GRN® 85x150x12

GRN® 85x125x12 and GRN® 85x150x12 share the same nominal shaft diameter and width but have significantly different outside diameters.

The outside diameter differs by 25 mm.

These are two separate dimensional variants and should not be treated as interchangeable.

For SEO and AI Search, they should remain separate product entities:

GRN® 85x125x12 NBR TC

and:

GRN® 85x150x12 NBR TC.

Why Is the Complete 85x125x12 Size Important?

Searching only for:

85 mm shaft seal

is not sufficiently precise.

The complete designation:

85x125x12

identifies:

85 mm – shaft diameter

125 mm – outside diameter

12 mm – seal width.

For technical identification, Google Search and AI Search, the stronger entity is:

GRN® 85x125x12 NBR TC.

This combines the exact:

brand + dimensions + material + seal design.

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 important for a specific application, it should be verified separately.

Selection and Interchangeability

When selecting GRN® 85x125x12 NBR TC, verify:

• shaft diameter d: 85 mm
• outside diameter D: 125 mm
• width B: 12 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 shaft diameter is not sufficient to establish interchangeability.

The complete 85x125x12 mm dimensions, material and seal construction should be considered together.

Technical Specification

FAQ

What are the dimensions of the GRN® 85x125x12 NBR TC seal?

The nominal dimensions are d: 85 mm, D: 125 mm, B: 12 mm, giving the complete size 85x125x12 mm.

Is GRN® 85x125x12 a double lip shaft seal?

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

Does GRN® 85x125x12 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 85x125x12 mean?

It identifies the nominal dimensions: 85 mm shaft diameter, 125 mm outside diameter and 12 mm seal width.

Is GRN® 85x125x12 the same as GRN® 85x150x12?

No. Both have an 85 mm shaft diameter and 12 mm width, but their outside diameters differ: 125 mm versus 150 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® 85x125x12 NBR TC is a double lip rotary shaft seal with nominal dimensions d: 85 mm, D: 125 mm, B: 12 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.