14x26x7 NBR TC - Double Lip Rotary Shaft Oil Seal

Technical Specifications - 14x26x7 NBR TC

The TC designation identifies the double lip construction. Correct product selection also requires verification of dimensions, material compatibility and operating conditions.

What Does 14x26x7 NBR TC Mean?

14x26x7 mm - Oil Seal Dimensions

The dimensional designation specifies:

• 14 mm - nominal shaft diameter.

• 26 mm - nominal housing bore diameter.

• 7 mm - nominal axial seal width.

These dimensions must correspond to the requirements of the mechanical assembly.

Matching dimensions alone do not guarantee interchangeability between oil seals with different materials or constructions.

NBR - Nitrile Butadiene Rubber

NBR is an elastomer widely used in industrial sealing applications.

It generally provides good resistance to many mineral oils, greases and conventional lubricants.

NBR is commonly used in dynamic sealing applications where the elastomer operates in contact with a rotating shaft.

Its actual chemical and thermal resistance depends on the specific rubber compound and operating conditions.

NBR should not be assumed to be compatible with every industrial fluid.

TC - Double Lip Oil Seal Profile

The TC profile incorporates two sealing lips:

• A primary sealing lip designed to restrict lubricant leakage.

• An additional dust lip that helps protect the primary sealing area against external contamination.

This construction combines dynamic radial shaft sealing with additional protection against dust and fine particles.

TC is a commonly used international designation for this type of double lip rotary shaft oil seal.

However, the TC designation does not guarantee identical construction details across all manufacturers.

Construction and Operating Principle

Primary Sealing Lip

The primary sealing lip operates in contact with the rotating shaft surface, which has a nominal diameter of 14 mm.

Its main function is to restrict the escape of oil or another compatible lubricant from the sealed assembly.

Effective sealing depends on:

• Correct contact between the lip and shaft.

• Shaft surface condition.

• Suitable lubrication.

• Operating temperature.

• Shaft rotational speed.

• Pressure conditions.

• Correct installation.

Damage to the shaft surface or incorrect installation may cause accelerated sealing lip wear and leakage.

Additional Dust Lip

The secondary lip provides an additional barrier against external contamination.

It helps reduce the entry of dust and fine particles into the primary sealing area.

However, the dust lip does not automatically guarantee complete sealing against immersion or high-pressure water.

NBR Sealing Elastomer

Nitrile butadiene rubber forms the flexible sealing element that operates against the rotating shaft.

Its properties make it suitable for many conventional applications involving mineral oil-based lubricants.

Compatibility with the actual operating medium must be verified before installation.

Outer Seating Surface

The outer surface of the oil seal is designed to fit into a housing bore with a nominal diameter of 26 mm.

Correct fit and housing surface condition are important for maintaining the position and effectiveness of the seal.

14x26x7 NBR TC vs FPM/FKM TC Oil Seals

Oil seals with identical dimensions and double lip construction may differ in elastomer material.

FPM/FKM is not automatically the better material for every application.

Material selection must be based on the operating fluid, temperature, rotational speed and equipment requirements.

When Is NBR an Appropriate Choice?

NBR is commonly selected for mechanical assemblies operating with compatible mineral oils and greases.

It is widely used where the required operating conditions fall within the capabilities of the specific nitrile rubber compound.

When Should FPM/FKM Be Considered?

FPM/FKM may be considered where higher thermal resistance or different chemical compatibility characteristics are required.

However, replacing NBR with FPM/FKM requires verification of the actual operating conditions.

Double Lip TC vs Single Lip Oil Seals

The main construction difference is the presence of an additional dust lip.

The additional lip may influence friction and lubrication requirements.

A single lip 14x26x7 mm oil seal should not automatically be considered interchangeable with the TC version.

Applications of 14x26x7 NBR TC

Radial rotary shaft oil seals of this type are used in appropriately designed mechanical assemblies containing rotating shafts.

Typical application categories include:

• Small mechanical gearboxes.

• Machinery drive assemblies.

• Rotating mechanisms.

• Bearing housings.

• Workshop equipment.

• Industrial machinery.

These are general application categories for this type of rotary shaft oil seal, not a confirmed list of specific equipment models.

Final selection requires verification of the technical requirements of the mechanical assembly.

Small Mechanical Gearboxes

Rotary shaft oil seals are commonly used to restrict lubricant leakage where rotating shafts pass through gearbox housings.

The selected seal must be compatible with the lubricant, shaft dimensions and operating conditions.

Bearing Housings

In suitable bearing arrangements, rotary shaft oil seals can help retain lubricant and limit contamination.

Correct installation and lubrication conditions are essential.

Industrial Drive Assemblies

Double lip oil seals may be useful in mechanical drives where both lubricant retention and additional protection against dust are required.

Suitability depends on the specific assembly design.

Selection and Interchangeability

Before purchasing a 14x26x7 NBR TC oil seal, verify:

1. Nominal shaft diameter of 14 mm.

2. Nominal housing bore diameter of 26 mm.

3. Axial seal width of 7 mm.

4. Required TC double lip construction.

5. NBR elastomer material.

6. Type of operating fluid.

7. Operating temperature.

8. Shaft rotational speed.

9. Pressure conditions.

10. Shaft surface condition.

11. Lubrication requirements.

12. Required protection against contamination.

Dimensional compatibility is necessary but may not be sufficient to establish complete interchangeability.

Can Another 14x26x7 mm Oil Seal Be Used?

Only if the replacement has suitable dimensions, material, construction and operating characteristics.

A matching dimensional designation does not automatically establish technical equivalence.

Can NBR Be Replaced with FPM/FKM?

Such a replacement may be possible after verifying material compatibility and operating conditions.

The two elastomer families have different thermal and chemical resistance characteristics.

Can a Single Lip Seal Replace a TC Double Lip Seal?

Not automatically.

Differences in sealing lip construction may affect contamination protection, friction and operating requirements.

Installation and Operating Recommendations

Shaft Preparation

Before installation, clean the shaft and inspect the sealing contact surface.

Burrs, corrosion, grooves and other damage may cause accelerated wear or leakage.

Housing Preparation

The housing bore should be clean, undamaged and correctly dimensioned.

Protecting the Sealing Lips

Avoid contact between the sealing lips and sharp edges, threads or shaft grooves during installation.

Use an appropriate installation sleeve where necessary.

Installation Orientation

Install the oil seal according to the equipment manufacturer's instructions.

In typical lubricant-retaining applications, the primary sealing lip faces the sealed medium, while the additional dust lip faces the external environment.

Lubrication

Provide suitable lubrication before starting the equipment.

Avoid unintended dry-running conditions.

Storage

Store the oil seal in a clean, dry environment, away from excessive heat, direct sunlight and substances that may damage the elastomer.

Avoid deformation of the sealing lips during storage.

Frequently Asked Questions - 14x26x7 NBR TC

What Are the Dimensions of a 14x26x7 Oil Seal?

The seal has a nominal inside diameter of 14 mm, an outside diameter of 26 mm and an axial width of 7 mm.

What Does NBR Mean?

NBR stands for nitrile butadiene rubber, an elastomer commonly used in sealing applications involving compatible oils and greases.

What Does TC Mean in an Oil Seal?

TC identifies a common double lip rotary shaft oil seal construction with a primary sealing lip and an additional dust exclusion lip.

Is This a Double Lip Oil Seal?

Yes. It features a primary sealing lip for lubricant retention and a secondary dust lip for additional protection against external contamination.

Is NBR Suitable for Oil?

NBR is commonly used with many mineral oils.

Compatibility with a specific oil must be verified based on its composition and operating conditions.

Can an NBR Oil Seal Be Replaced with FPM/FKM?

Replacement may be considered after checking chemical compatibility, temperature and equipment requirements.

Identical dimensions alone do not guarantee interchangeability.

Does the Additional Dust Lip Protect Against Water?

The dust lip helps limit external contamination but does not guarantee complete protection against immersion or pressurised water.

Is a 14x26x7 TC Oil Seal Interchangeable with a Single Lip Version?

Not automatically.

Seal construction, lubrication conditions and contamination protection requirements must be considered.

14x26x7 NBR TC - Quick Technical Overview

The 14x26x7 NBR TC is a double lip radial rotary shaft oil seal made from nitrile butadiene rubber. It has a 14 mm inside diameter, 26 mm outside diameter and 7 mm width. The TC profile combines a primary lubricant-retaining lip with an additional dust lip. NBR is suitable for many applications involving compatible mineral oils and greases.

Rotary Shaft Oil Seals at simmering.pl

Rotary shaft oil seals are available through simmering.pl, a specialist supplier of industrial sealing components, bearings and mechanical replacement parts.

We serve industrial companies, mechanical workshops, maintenance departments and B2B customers.

Our warehouse and order processing operations are located in Lublin, Poland.

We supply customers throughout Poland and the European Union and offer worldwide shipping.

We also assist customers in identifying oil seals by dimensions, elastomer materials and construction profiles.