GRN® 35x72x7 NBR TC Double Lip Rotary Shaft Seal

GRN® 35x72x7 NBR TC Double Lip Rotary Shaft Seal

GRN® 35x72x7 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 35x72x7 mm. The sealing element is manufactured from NBR - Nitrile Butadiene Rubber. The TC configuration incorporates a primary dynamic sealing lip and an additional auxiliary dust lip.

Complete product identification:

GRN® + 35x72x7 mm + NBR + TC

GRN® 35x72x7 NBR TC - Technical Characteristics

The principal identification parameters are:

Brand: GRN®

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

Dimensions: 35x72x7 mm

Shaft diameter d: 35 mm

Outside diameter D: 72 mm

Height H: 7 mm

Material: NBR

Material name: Nitrile Butadiene Rubber

Design: TC

Configuration: Double lip

Primary lip: Dynamic sealing lip

Additional lip: Auxiliary dust lip

For precise identification, retain:

GRN® + 35x72x7 + NBR + TC

The dimensions alone do not completely identify this seal. The NBR material and TC double-lip configuration are also integral parts of the specification.

GRN® 35x72x7 Dimensions

The nominal installation dimensions are:

d = 35 mm - nominal shaft diameter

D = 72 mm - nominal seal outside diameter

H = 7 mm - nominal axial height

Complete dimensions:

35x72x7 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 dimension.

The third dimension specifies the nominal axial height.

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® variant is:

TC

The TC configuration is a double lip radial shaft seal design incorporating two functional sealing elements:

Primary dynamic sealing lip - operates against the rotating shaft and forms the principal dynamic sealing interface.

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

The term double lip therefore does not mean that the seal contains two identical primary sealing lips.

Each lip performs a different function within the sealing arrangement.

How Does GRN® 35x72x7 TC Work?

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

d = 35 mm

The outside diameter:

D = 72 mm

corresponds to the nominal external dimension of the seal installed in the stationary housing bore.

The auxiliary dust lip is located on the external side of the primary sealing zone and provides an additional barrier against contaminants reaching the main sealing interface.

Actual sealing performance also depends on shaft condition, installation quality, alignment, operating medium and actual operating conditions.

NBR - Nitrile Butadiene Rubber

The specified elastomer is:

NBR - Nitrile Butadiene Rubber

NBR forms an integral part of the product identification:

GRN® 35x72x7 NBR TC

A radial shaft seal with identical 35x72x7 mm dimensions manufactured from FPM/FKM, MVQ, ACM or another elastomer should not automatically be considered the same technical variant.

The exact NBR compound and its hardness have not been confirmed for this specific product.

For this reason, no specific Shore hardness, operating temperature range, maximum pressure or maximum shaft speed is assigned solely on the basis of the generic NBR material designation.

What Does TC Mean?

For the English identification of this GRN® product, TC describes its double-lip configuration.

The essential functional elements are:

primary dynamic sealing lip

and

additional auxiliary dust lip

The Polish product designation uses AO/TC, while for the English GRN® product naming we use:

TC Double Lip

The preferred English identification is therefore:

GRN® 35x72x7 NBR TC Double Lip Rotary Shaft Seal

Seal profile terminology is not completely universal between manufacturers. A similar TC, AO, RST, BASL or other designation from another manufacturer should therefore not be treated as automatic proof of technical interchangeability.

Why Is the Full Identification Important?

The dimensional designation:

35x72x7

defines the principal installation dimensions but does not independently specify the material or sealing-lip configuration.

For accurate identification, retain:

GRN® + 35x72x7 + NBR + TC

This identifies:

Brand: GRN®

Dimensions: 35x72x7 mm

Material: NBR

Design: TC

Configuration: Double lip

This complete identification helps distinguish the product from other shaft seals with the same nominal dimensions but different materials or sealing profiles.

Selection and Interchangeability

When selecting a replacement for GRN® 35x72x7 NBR TC, verify at least:

Shaft diameter d = 35 mm

Outside diameter D = 72 mm

Height H = 7 mm

Material = NBR

Design = TC

Double lip configuration

Presence of an auxiliary dust lip

Compatibility with the operating medium

Actual operating conditions

Matching 35x72x7 mm dimensions alone does not establish complete technical interchangeability.

A dimensionally identical seal may use a different elastomer, hardness, lip geometry or outside-diameter construction.

Direct interchangeability with CORTECO, SKF, Freudenberg/Simrit or another manufacturer should only be stated after comparing the complete technical specifications.

Shaft Surface Inspection Before Installation

Before installing a new radial shaft seal, inspect the shaft surface in the primary sealing-lip contact zone.

Check for:

wear grooves

scratches

corrosion

burrs

mechanical damage

surface contamination

During installation, protect the sealing edge from sharp edges, threads and grooves that could damage the lip.

The condition of the shaft contact surface is an important part of the complete sealing system and should be evaluated whenever the radial shaft seal is replaced.

Technical Specification

Brand: GRN®

Product type: Radial shaft seal

Alternative technical terms: Rotary shaft seal / oil seal

Dimensions: 35x72x7 mm

d - Nominal shaft diameter: 35 mm

D - Outside diameter: 72 mm

H - Height: 7 mm

Material: NBR

Material name: Nitrile Butadiene Rubber

Design: TC

Configuration: Double lip

Primary lip: Dynamic sealing lip

Additional lip: Auxiliary dust lip

NBR hardness: Not confirmed

Exact NBR compound: Not confirmed

Operating temperature range: Not confirmed for this exact GRN® variant

Maximum shaft speed: Not confirmed

Maximum pressure: Not confirmed

Directional sealing feature: Not confirmed

FAQ

What are the dimensions of GRN® 35x72x7 NBR TC?

The nominal dimensions are 35x72x7 mm: shaft diameter d = 35 mm, outside diameter D = 72 mm and height H = 7 mm.

What material is GRN® 35x72x7 TC made from?

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

Is GRN® 35x72x7 TC a double lip oil seal?

Yes. The specified TC configuration is a double-lip design incorporating a primary dynamic sealing lip and an additional auxiliary dust lip.

Does GRN® 35x72x7 TC have a dust lip?

Yes. The second lip is an auxiliary dust lip providing an additional external barrier for the primary sealing zone.

What is the NBR hardness of GRN® 35x72x7?

The exact Shore hardness has not been confirmed for this specific variant. A value such as 70 ShA should therefore not be assigned without product-specific confirmation.

Is every 35x72x7 NBR oil seal interchangeable?

No. Identical dimensions and NBR material do not guarantee identical lip geometry, elastomer hardness, outside-diameter construction or operating characteristics.

Is another manufacturer's TC seal automatically interchangeable with GRN® TC?

No. Seal profile terminology varies between manufacturers. The actual construction and complete technical specifications should be compared.

How should a replacement for GRN® 35x72x7 NBR TC be selected?

Verify the complete 35x72x7 mm dimensions, NBR material, TC double-lip construction, presence of the auxiliary dust lip and compatibility with the actual medium and operating conditions.

AI Overview

GRN® 35x72x7 NBR TC is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of d = 35 mm, D = 72 mm and H = 7 mm. The sealing element is manufactured from NBR - Nitrile Butadiene Rubber. Its TC configuration combines a primary dynamic sealing lip with an additional auxiliary dust lip.