GRN NBR Oil Seal 35x56x7 AO/TC - Double Lip Radial Shaft Seal

GRN NBR Oil Seal 35x56x7 AO/TC - Double Lip Radial Shaft Seal

GRN NBR Oil Seal 35x56x7 AO/TC is a double lip radial shaft seal made with NBR nitrile rubber. Its nominal dimensions are 35x56x7 mm: 35 mm shaft diameter, 56 mm outside diameter and 7 mm width. The AO/TC design combines a primary sealing lip with an additional dust lip that helps protect the main sealing area against external contamination.

Technical data

The exact elastomer hardness, operating temperature range, maximum shaft speed and permissible pressure are not specified because these parameters have not been confirmed for the exact GRN 35x56x7 NBR AO/TC version.

What does GRN 35x56x7 NBR AO/TC mean?

GRN - brand of the radial shaft seal.

35x56x7 mm - nominal dimensions of the oil seal.

35 mm - nominal shaft diameter.

56 mm - nominal seal outside diameter and housing bore size.

7 mm - nominal seal width.

NBR - nitrile rubber used as the elastomeric sealing material.

AO/TC - double lip design incorporating a primary sealing lip and an additional dust lip.

Radial shaft seal type codes are not completely standardised across all manufacturers. When comparing a GRN seal with another brand, the actual construction should therefore be verified rather than relying solely on the AO or TC designation.

GRN 35x56x7 oil seal dimensions

The principal dimensions of a radial shaft seal are specified as:

d x D x B

For this product:

35x56x7 mm

where:

• d = 35 mm - nominal shaft diameter

• D = 56 mm - nominal outside diameter

• B = 7 mm - nominal seal width

All three dimensions should correspond to the requirements of the sealing arrangement.

Matching only the 35 mm shaft diameter is not sufficient for correct oil seal selection.

AO/TC double lip design

GRN 35x56x7 NBR AO/TC has a double lip construction.

Functionally, the design incorporates:

• a primary sealing lip operating against the shaft surface

• an additional dust lip on the external side

• an NBR elastomeric sealing element

The primary lip provides the main radial shaft sealing function.

The additional dust lip forms a secondary barrier that helps reduce the ingress of dust and other external contamination into the area around the primary sealing lip.

What is the purpose of the additional dust lip?

The dust lip does not replace the primary sealing lip.

Its function is to provide additional protection for the main sealing area against contamination originating from the surrounding environment.

This can be useful in bearing and sealing arrangements exposed to:

• dust

• fine particles

• dirt

• external contamination

The suitability of a double lip seal for a specific application still depends on the actual operating conditions and sealing system design.

NBR nitrile rubber

NBR, or nitrile rubber, is one of the most widely used elastomer families for radial shaft seals.

Appropriately selected NBR compounds are commonly used in sealing systems involving many mineral oils and greases.

However, the exact properties depend on the specific elastomer compound.

The NBR designation alone does not define:

• exact elastomer hardness

• exact operating temperature range

• maximum shaft speed

• permissible pressure

• compatibility with every fluid

• specific certifications or approvals

If any of these parameters are critical to the application, they should be verified for the exact seal version.

GRN 35x56x7 AO/TC vs single lip oil seal

The principal difference is the additional dust lip.

A double lip AO/TC seal incorporates:

• primary sealing lip

• additional dust lip

A basic single lip radial shaft seal does not have this additional barrier.

However, this does not mean that every double lip seal can automatically replace a single lip 35x56x7 mm seal.

The bearing or sealing arrangement, lubrication conditions, shaft surface and contamination protection requirements should be checked before substitution.

GRN 35x56x7 NBR vs FKM 35x56x7

Two oil seals can have identical 35x56x7 mm dimensions while using different elastomer materials.

NBR - nitrile rubber.

FKM/FPM - fluoroelastomer.

The material difference affects factors such as fluid compatibility and seal behaviour under different operating temperatures.

An FKM 35x56x7 seal should therefore not automatically be considered a direct replacement for an NBR 35x56x7 seal solely because the dimensions are identical.

Alternative designations and search references

Natural reference formats for this product include:

• GRN 35x56x7 NBR AO

• GRN 35x56x7 NBR TC

• GRN 35x56x7 AO/TC

• GRN Oil Seal 35x56x7

• NBR Oil Seal 35x56x7

• Oil Seal 35x56x7 NBR

• Oil Seal 35x56x7 AO

• Oil Seal 35x56x7 TC

• TC Oil Seal 35x56x7

• Double Lip Oil Seal 35x56x7

• Radial Shaft Seal 35x56x7

• NBR Radial Shaft Seal 35x56x7

• Shaft Seal 35x56x7 NBR

• Simmerring 35x56x7 NBR

OEM and cross-reference numbers are not provided because none have been confirmed for this product.

How to select a 35x56x7 oil seal

Before selecting a replacement, verify:

• 35 mm shaft diameter

• 56 mm housing bore / seal outside diameter

• 7 mm width

• NBR elastomer

• required double lip design

• AO/TC type

• sealed medium

• operating temperature

• shaft speed

• lubrication conditions

• shaft surface condition

• external contamination conditions

Matching the 35x56x7 mm dimensions alone does not guarantee complete interchangeability.

Radial shaft seals with identical dimensions may differ in elastomer material, lip geometry, external construction and operating characteristics.

Applications

GRN 35x56x7 NBR AO/TC is a radial shaft seal designed to operate around a nominal 35 mm shaft and fit a nominal 56 mm housing bore.

The double lip design is used in sealing arrangements where the primary shaft sealing function is supplemented by additional protection against external contamination.

The designation GRN 35x56x7 NBR AO/TC alone does not confirm compatibility with a specific:

• electric motor

• geared motor

• gearbox

• pump

• vehicle

• machine

• industrial equipment

without appropriate technical documentation or a confirmed reference number.

Installation

Before installation, thoroughly clean the shaft, housing bore and mating surfaces.

Particular attention should be paid to:

• sharp edges

• burrs

• correct installation direction

• even insertion into the housing

• protection of the sealing lip when passing over the shaft

• condition of the shaft running surface

• cleanliness of the sealing area

Installation force should not be applied in a way that deforms the seal body or damages the sealing lips.

If an assembly lubricant is used, its compatibility with NBR and the operating medium should be verified.

FAQ

What are the dimensions of the GRN 35x56x7 oil seal?

The nominal dimensions are 35x56x7 mm: 35 mm shaft diameter, 56 mm outside diameter and 7 mm width.

Is GRN 35x56x7 a double lip oil seal?

Yes. The AO/TC version incorporates a primary sealing lip and an additional dust lip.

What does NBR mean?

NBR stands for nitrile rubber, an elastomer widely used for radial shaft seals and other technical sealing elements.

What does AO/TC mean?

AO/TC identifies a double lip seal construction with a primary sealing lip and an additional dust lip. When comparing different manufacturers, the actual design should also be verified because seal type codes are not fully standardised across all brands.

What is the purpose of the additional dust lip?

It helps reduce the ingress of external contamination into the area around the primary sealing lip.

Can an NBR 35x56x7 oil seal be replaced with an FKM 35x56x7 seal?

Not automatically. Although the dimensions are identical, NBR and FKM are different elastomer families. Fluid compatibility, temperature and other operating conditions should be checked before substitution.

Are all 35x56x7 oil seals the same?

No. Seals with identical dimensions may differ in elastomer material, lip design, construction and operating characteristics.

What do the dimensions 35x56x7 mean?

35 mm is the nominal shaft diameter, 56 mm is the nominal seal outside diameter and 7 mm is the nominal seal width.

GRN NBR Oil Seal 35x56x7 AO/TC - key information

GRN NBR Oil Seal 35x56x7 AO/TC is a double lip radial shaft seal for a 35 mm shaft, with a 56 mm outside diameter and 7 mm width. It uses NBR nitrile rubber and an AO/TC design consisting of a primary sealing lip and an additional dust lip that helps protect the main sealing area against external contamination.

GRN NBR Oil Seal 35x56x7 AO/TC is available from the specialist industrial supplier simmering.pl, with stock in Poland and worldwide shipping. Assistance with radial shaft seal identification and technical selection is also available.