290x330x18 FKM/FPM TC - Double Lip Rotary Shaft Oil Seal

Technical Specifications - 290x330x18 FKM/FPM TC

What Does 290x330x18 FKM/FPM TC Mean?

290x330x18 mm - Mounting Dimensions

The dimensional designation specifies:

• 290 mm - nominal shaft diameter.

• 330 mm - nominal housing bore diameter.

• 18 mm - nominal axial seal width.

The large diameter of this oil seal requires particular attention during installation, especially regarding shaft alignment, surface condition and uniform seating within the housing.

The dimensions alone do not establish the permissible operating temperature, shaft speed or pressure.

FKM/FPM - Fluoroelastomer

FKM and FPM are designations for the same general family of fluorocarbon elastomers, used under different material naming systems.

Fluoroelastomers are widely used in technical sealing applications because of their resistance to many mineral oils, greases and elevated temperatures.

Compared with conventional NBR compounds, FKM/FPM materials generally provide higher thermal resistance.

However, actual chemical and temperature resistance depends on the specific elastomer formulation.

A universal temperature range should not be assumed for all FKM/FPM rotary shaft oil seals.

Are FKM, FPM and Viton the Same Material?

FKM and FPM are general designations for fluoroelastomers.

Viton is a registered trademark for specific fluoroelastomer materials.

In commercial terminology, FKM/FPM oil seals are sometimes described as Viton-type oil seals.

However, this does not automatically confirm that a particular product is manufactured from genuine Viton-branded elastomer.

The material designation for this product is FKM/FPM.

TC - Double Lip Oil Seal Profile

The TC profile incorporates two lips:

• A primary sealing lip designed to restrict the escape of oil or another compatible lubricant.

• An additional dust lip that helps reduce contamination of the primary sealing area.

The TC profile is commonly used for double lip radial rotary shaft oil seals.

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

Construction and Operating Principle

Primary Sealing Lip

The primary sealing lip operates in direct contact with the rotating shaft surface, which has a nominal diameter of 290 mm.

Its main function is to restrict lubricant leakage from the sealed mechanical assembly.

Effective sealing depends on correct lip contact, shaft surface condition, lubrication and operating parameters.

Additional Dust Lip

The secondary lip provides an additional barrier against dust and fine external contaminants.

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

However, the dust lip does not guarantee complete sealing against immersion or pressurised water.

FKM/FPM Sealing Elastomer

The fluoroelastomer forms the flexible sealing element that operates against the rotating shaft.

Its material characteristics can be beneficial in applications involving compatible lubricants and elevated temperatures.

Correct material selection requires verification of the operating medium and actual working conditions.

Outer Seating Surface

The outer surface of the oil seal is designed to fit into a housing bore with a nominal diameter of 330 mm.

For large-diameter seals, uniform seating is especially important to avoid tilting or deformation during installation.

290x330x18 FKM/FPM TC vs NBR TC Oil Seals

Oil seals with identical dimensions may be manufactured from different elastomer materials.

FKM/FPM may be advantageous in applications requiring increased thermal resistance.

However, it is not automatically suitable for every fluid or operating environment.

Material interchangeability requires technical verification.

When Should FKM/FPM Be Considered?

FKM/FPM may be appropriate where operating conditions require higher thermal resistance or chemical compatibility characteristics different from those of conventional NBR.

Can NBR Replace FKM/FPM?

Not automatically.

The replacement material must meet the temperature, lubricant compatibility and other operating requirements of the assembly.

Double Lip TC vs Single Lip Oil Seals

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

A TC double lip oil seal provides an additional barrier against external contamination.

However, the secondary lip may also influence friction and lubrication requirements.

For large-diameter rotating shafts, lubrication and frictional heat generation are particularly important considerations.

Single lip and double lip oil seals with matching dimensions are not necessarily interchangeable.

Applications of 290x330x18 FKM/FPM TC

Large-diameter rotary shaft oil seals may be used in appropriately designed mechanical assemblies.

Typical application categories for this type of sealing component include:

• Large industrial gearboxes.

• Machinery drive mechanisms.

• Rotating shaft assemblies.

• Bearing housings.

• Heavy industrial equipment.

• Manufacturing and processing machinery.

These are general application categories, not a confirmed list of specific equipment models compatible with this product.

Correct selection must be based on the machine's technical documentation and actual operating requirements.

Large Industrial Gearboxes

Rotary shaft oil seals help restrict lubricant leakage where rotating shafts pass through gearbox housings.

Correct seal selection depends on shaft dimensions, sealing profile, lubricant and operating conditions.

Bearing Housings

In suitable bearing arrangements, large-diameter oil seals may help retain lubricant and reduce contamination.

The sealing system must be compatible with the housing geometry and shaft operating conditions.

Heavy Industrial Machinery

Large-diameter rotary shaft seals may be required in industrial assemblies containing substantial rotating components.

Operating speed, shaft alignment, lubrication and temperature must be considered during selection.

Large Shaft Diameter and Operating Conditions

Shaft Surface Speed

For large-diameter rotary shaft seals, shaft surface speed is a particularly important operating parameter.

At the same rotational speed, a larger shaft diameter produces a higher linear speed at the sealing lip contact surface.

Shaft surface speed can be calculated using:

v = π x d x n / 60000

Where:

• v - shaft surface speed in m/s.

• d - shaft diameter in mm.

• n - rotational speed in rpm.

For a shaft diameter of 290 mm, the calculated surface speeds are approximately:

These values are geometric calculations based on shaft diameter.

They are not the manufacturer's approved operating speed limits for this oil seal.

Permissible operating conditions must be verified using the technical specifications of the actual product.

Friction and Heat Generation

Contact between the sealing lip and rotating shaft generates friction.

For large-diameter shafts, surface speed, lubrication and heat dissipation require particular attention.

Excessive temperature in the sealing contact area may accelerate elastomer degradation and wear.

Shaft Alignment and Runout

Incorrect alignment or excessive shaft runout can adversely affect oil seal performance.

Permissible shaft runout and eccentricity must be established using the technical requirements of the seal and mechanical assembly.

Pressure Conditions

Standard radial rotary shaft oil seals are not automatically suitable for pressurised applications.

The permissible pressure depends on the seal construction, shaft speed, temperature and other operating conditions.

Pressure capability must be verified before using the seal in an application involving significant internal pressure.

Selection and Interchangeability

Before purchasing a 290x330x18 FKM/FPM TC oil seal, verify:

1. Nominal shaft diameter of 290 mm.

2. Nominal housing bore diameter of 330 mm.

3. Axial seal width of 18 mm.

4. Required TC double lip profile.

5. FKM/FPM elastomer material.

6. Type of operating fluid.

7. Operating temperature.

8. Shaft rotational speed and surface speed.

9. Pressure conditions.

10. Shaft alignment and runout.

11. Shaft sealing surface condition.

12. Lubrication requirements.

Dimensional compatibility alone is not sufficient to establish complete interchangeability.

Can Another 290x330x18 mm Oil Seal Be Used?

Only if the replacement meets the required dimensions, material specifications, sealing lip construction and operating conditions.

Matching dimensions do not guarantee technical equivalence.

Can a Single Lip Oil Seal Replace a TC Version?

Not automatically.

The additional dust lip may be required for contamination protection in the original assembly.

Is FKM/FPM Always Better Than NBR?

No.

The most appropriate material depends on the operating fluid, temperature and application requirements.

FKM/FPM generally provides higher thermal resistance, but this does not make it universally superior.

Installation of a Large-Diameter 290x330x18 Oil Seal

Shaft Preparation

The shaft surface should be clean and free from burrs, corrosion and damage.

Inspect the area where the primary sealing lip will contact the shaft.

Housing Preparation

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

Uniform Installation

Because of the large dimensions, particular care should be taken to install the seal evenly into the housing.

Uneven installation force may cause the seal to tilt or deform.

Use suitable installation tools that distribute force appropriately.

Protecting the Sealing Lips

Protect the sealing lips from sharp edges, grooves and threads during installation.

Use an appropriate installation sleeve where necessary.

Correct 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 during storage.

Frequently Asked Questions - 290x330x18 FKM/FPM TC

What Are the Dimensions of a 290x330x18 Oil Seal?

The nominal inside diameter is 290 mm, the outside diameter is 330 mm and the axial width is 18 mm.

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.

Are FKM and FPM the Same Material?

Yes. Both designations refer to the general fluoroelastomer material family.

Is This a Viton Oil Seal?

The seal is manufactured from FKM/FPM fluoroelastomer, sometimes described commercially as Viton-type material.

However, this does not confirm the use of genuine Viton-branded elastomer.

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

Such a replacement may be considered after verifying chemical compatibility, operating temperature and equipment requirements.

Is This Oil Seal Suitable for Large Industrial Gearboxes?

It may be suitable for appropriately designed assemblies if the required dimensions, profile, material and operating conditions match the seal's specifications.

Does Large Shaft Diameter Affect Oil Seal Performance?

Yes. At the same rotational speed, a larger shaft diameter produces a higher surface speed, which can influence friction and heat generation.

Is the TC Profile Suitable for Dusty Environments?

The additional dust lip provides an extra barrier against external contamination.

However, suitability depends on the type and severity of contamination and the overall sealing arrangement.

290x330x18 FKM/FPM TC - Quick Technical Overview

The 290x330x18 FKM/FPM TC is a large-diameter double lip radial rotary shaft oil seal. It has a nominal inside diameter of 290 mm, an outside diameter of 330 mm and a width of 18 mm. Its TC profile incorporates a primary sealing lip and an additional dust lip. FKM/FPM fluoroelastomer offers resistance to many oils and elevated temperatures.

Large-Diameter Rotary Shaft Oil Seals at simmering.pl

Large-diameter 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, maintenance departments, mechanical workshops 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 rotary shaft oil seals by dimensions, elastomer materials and construction profiles.