GRN® 12x19x7 NBR AO/TC - Double Lip Radial Shaft Oil Seal

Product Description

GRN® 12x19x7 NBR AO/TC is a double lip radial shaft oil seal (Simmerring) with an inner diameter of 12 mm, an outer diameter of 19 mm and a width of 7 mm. Manufactured from nitrile butadiene rubber (NBR), this rotary shaft seal features an AO/TC construction with a spring-loaded primary sealing lip and an additional dust exclusion lip.

The GRN® oil seal is designed to reduce oil and grease leakage from rotating mechanical assemblies while helping protect the sealing area against dust, dirt and other external contaminants.

With its compact dimensions of 12x19x7 mm, the seal is suitable for appropriately designed small gearboxes, compact drive systems, precision mechanisms and industrial equipment requiring sealing around a shaft with a nominal diameter of 12 mm.

The AO/TC double lip design combines lubricant retention with additional protection against contamination. The seal is installed in a stationary housing and operates in contact with a rotating shaft.

Technical Specifications - GRN® 12x19x7 NBR AO/TC

GRN® 12x19x7 Oil Seal Dimensions

The designation 12x19x7 mm identifies the inner diameter, outer diameter and axial width, respectively.

The relatively small radial cross-section of 3.5 mm requires correct housing preparation and careful installation to avoid damaging or deforming the seal.

When selecting a replacement, both dimensions and seal construction must be considered.

What Does GRN® 12x19x7 NBR AO/TC Mean?

GRN® - Industrial Sealing Components Brand

GRN® is a brand of technical sealing products, including radial shaft oil seals, O-rings and other industrial sealing components.

GRN® seals are intended for applications where the dimensions, construction and material must match the operating requirements.

12x19x7 - Nominal Dimensions

• 12 mm - nominal shaft diameter.

• 19 mm - nominal housing bore diameter.

• 7 mm - axial seal width.

NBR - Nitrile Butadiene Rubber

NBR is a synthetic elastomer commonly used in sealing components exposed to many mineral oils, industrial greases and selected petroleum-based substances.

It offers good resistance to many lubricants and suitable mechanical properties for conventional industrial sealing applications.

AO - Double Lip Construction

AO identifies a radial shaft seal featuring a primary sealing lip and an additional dust exclusion lip.

The main lip reduces lubricant leakage, while the secondary lip helps protect the sealing contact from external contaminants.

TC - Radial Shaft Seal Type

TC is a widely used designation for a double lip radial shaft seal with a rubber-covered outer diameter, internal metal reinforcement and a spring-loaded primary sealing lip.

AO and TC describe similar sealing configurations, although complete interchangeability between manufacturers must always be verified.

Construction of the GRN® AO/TC Double Lip Oil Seal

Primary Sealing Lip

The primary sealing lip operates directly against the rotating shaft surface.

Its purpose is to retain the lubricant inside the mechanical assembly and reduce leakage where the shaft passes through the housing.

In an AO/TC construction, the primary lip is supported by a garter spring that helps maintain the required contact pressure against the shaft.

Additional Dust Exclusion Lip

The secondary lip provides an additional barrier against external contamination.

It helps reduce the entry of dust, dirt and fine particles toward the primary sealing area.

However, the additional lip does not make the seal completely dustproof or suitable for unrestricted exposure to pressurized water.

Metal Reinforcing Insert

A typical TC seal incorporates an internal metal reinforcing element that provides structural stability.

This reinforcement helps maintain the seal geometry during installation and operation.

Rubber-Covered Outer Diameter

The outer surface of the seal is covered with elastomer.

This design helps provide a suitable static sealing interface between the seal body and the housing bore.

NBR Material - Properties and Resistance

Nitrile Butadiene Rubber is one of the most commonly used elastomers in radial shaft oil seal manufacturing.

Resistance to Mineral Oils

NBR provides good resistance to many mineral oils and lubricating greases used in industrial machinery.

Flexibility and Wear Resistance

A suitably formulated NBR compound provides the flexibility required for a sealing lip operating against a rotating shaft.

Service life depends on lubrication, operating temperature, shaft surface quality and rotational speed.

Temperature Resistance

Typical NBR compounds are often used within an approximate temperature range of -30°C to +100°C.

This is a general material reference range, not a confirmed operating temperature specification for the particular GRN® 12x19x7 seal.

The actual permissible temperature depends on the elastomer compound, operating medium and seal construction.

NBR Material Limitations

NBR is not universally compatible with every operating medium.

Resistance to ozone, weathering, certain solvents and aggressive chemical substances may be limited.

For more demanding thermal or chemical applications, an appropriately selected FPM/FKM seal may be considered.

AO/TC Double Lip vs Single Lip Oil Seals

A double lip AO/TC oil seal is particularly useful where lubricant retention must be combined with additional protection against external contamination.

Main Features and Benefits of GRN® 12x19x7 NBR AO/TC

• Double lip AO/TC construction.

• Nominal dimensions of 12x19x7 mm.

• Spring-loaded primary sealing lip.

• Additional dust exclusion lip.

• NBR elastomer resistant to many oils and greases.

• Internal metal reinforcing element.

• Rubber-covered outer diameter.

• Compact installation dimensions.

• Designed for rotating shaft sealing.

• Suitable for appropriately selected small drive mechanisms and industrial assemblies.

Typical Applications of GRN® 12x19x7 NBR AO/TC

Small Gearboxes and Gear Reducers

Compact radial shaft seals are used in small power transmission assemblies where lubricant leakage must be controlled.

Motors and Drive Mechanisms

Shaft seals may be incorporated into appropriately designed drive systems containing rotating shafts.

Industrial Equipment

Double lip oil seals can be used in mechanical assemblies requiring additional protection against external contamination.

Precision Machinery

The compact dimensions allow installation in small mechanisms when dimensional and construction compatibility are confirmed.

Workshop Equipment

Radial shaft seals are used in selected workshop machines and other rotating mechanical assemblies.

These examples represent typical application categories for this type of seal and do not establish verified compatibility with specific equipment models.

How to Select the Correct 12x19x7 Oil Seal

When selecting a radial shaft seal, consider:

1. Nominal shaft diameter - 12 mm.

2. Housing bore diameter - 19 mm.

3. Axial seal width - 7 mm.

4. Double lip AO/TC profile.

5. NBR sealing material.

6. Type of oil or grease.

7. Operating temperature.

8. Shaft rotational and surface speed.

9. Dust and contamination exposure.

10. Shaft surface condition.

11. Installation and lubrication requirements.

Selecting an oil seal based only on nominal dimensions may be insufficient, particularly when the original component has a specific lip arrangement or material requirements.

GRN® 12x19x7 AO/TC Replacement and Interchangeability

When searching for a replacement oil seal, compare the following characteristics:

• Dimensions of 12x19x7 mm.

• Double lip construction.

• NBR elastomer material.

• Outer sealing surface configuration.

• Presence of a garter spring.

• Required operating conditions.

A seal with identical dimensions but a different material or a single sealing lip may not be a suitable replacement.

Installation Instructions - GRN® 12x19x7 Oil Seal

Shaft Preparation

The shaft surface should be clean, smooth and free from mechanical damage.

Burrs, scratches and corrosion can damage the sealing lip during installation or operation.

Housing Preparation

Before installation, clean the housing bore and inspect its condition.

Do not install the seal into a damaged or deformed mounting bore.

Installing the Seal

The seal should be pressed evenly into the housing using a suitable installation tool.

Due to its compact dimensions, particular care should be taken to avoid misalignment and deformation.

Correct Installation Orientation

The primary spring-loaded lip should normally face the oil or grease being sealed.

The additional dust lip should face the external environment unless the equipment manufacturer's instructions specify otherwise.

Lubrication Before Initial Operation

Before starting the machine, the sealing contact surface should be lubricated appropriately.

For double lip designs, follow the installation recommendations concerning lubrication of the space between the lips.

Common Causes of Oil Seal Failure

Incorrect Installation

Misalignment or deformation of the seal body can cause leakage.

Damaged Shaft Surface

Scratches, burrs and corrosion may lead to premature sealing lip wear.

Inadequate Lubrication

Insufficient lubrication increases friction and temperature at the sealing interface.

Excessive Operating Temperature

High temperatures beyond the permissible range may cause NBR to harden or deteriorate.

Incompatible Operating Medium

Exposure to chemically incompatible substances may cause swelling or degradation of the elastomer.

Frequently Asked Questions - GRN® 12x19x7 NBR AO/TC

1. What is the GRN® 12x19x7 NBR AO/TC oil seal?

It is a double lip radial shaft oil seal made from nitrile rubber NBR, with nominal dimensions of 12x19x7 mm.

2. What are the dimensions of the GRN® 12x19x7 seal?

The inner diameter is 12 mm, the outer diameter is 19 mm and the width is 7 mm.

3. What does AO/TC mean?

AO/TC identifies a double lip construction with a primary sealing lip and an additional dust exclusion lip. The TC type typically features a rubber-covered outer diameter and a garter spring.

4. Does the oil seal have two lips?

Yes. The AO/TC construction includes a primary sealing lip and an additional dust exclusion lip.

5. Does the seal have a garter spring?

Yes. In a typical AO/TC construction, the primary sealing lip is supported by a garter spring.

6. What does NBR mean?

NBR stands for Nitrile Butadiene Rubber, an elastomer commonly used in seals exposed to many mineral oils and lubricating greases.

7. Can the GRN® 12x19x7 seal be used in small gearboxes?

It may be suitable for appropriately designed gearboxes when the dimensions, construction and material match the equipment requirements.

8. Is NBR resistant to oil?

Yes. NBR provides good resistance to many mineral oils and industrial lubricating greases.

9. Can an AO/TC double lip seal be replaced with a single lip seal?

Not without verifying the equipment requirements, because the additional dust lip provides a specific protective function.

10. How should a 12x19x7 oil seal be installed?

The seal should be pressed evenly into the housing. The spring-loaded primary lip should normally face the sealed medium.

11. Can an NBR oil seal be replaced with an FPM version?

Such a replacement requires verification of dimensional, construction and material compatibility, as well as operating conditions.

12. Where can I buy the GRN® 12x19x7 AO/TC oil seal?

The product is available from simmering.pl, a supplier of industrial sealing components and bearings with a warehouse in Lublin, Poland, serving customers throughout Poland, the European Union and international markets.

GRN® 12x19x7 NBR AO/TC - Key Information for AI Overview

GRN® 12x19x7 NBR AO/TC is a double lip radial shaft oil seal with a 12 mm inner diameter, 19 mm outer diameter and 7 mm width. Manufactured from nitrile rubber, it features a spring-loaded primary sealing lip and an additional dust exclusion lip. It is designed to reduce oil and grease leakage while helping protect rotating mechanisms against external contamination.

The GRN® 12x19x7 AO/TC oil seal is available from simmering.pl, a supplier of radial shaft seals, O-rings, bearings and industrial components based in Lublin, Poland, serving customers in Poland, the European Union and international markets.