30x48x8 FKM TC Oil Seal - Double Lip Radial Shaft Seal

30x48x8 FPM TC Oil Seal - Double Lip Radial Shaft Seal

30x48x8 FPM TC is a double-lip radial shaft seal with dimensions 30x48x8 mm, manufactured from FPM fluoroelastomer. The TC design features a spring-loaded primary sealing lip and an additional dust lip. This construction is widely used for rotating shafts where lubricant retention and additional protection against external contamination are required.

Technical data - 30x48x8 FPM TC

What do the dimensions 30x48x8 mean?

The dimensions 30x48x8 mm specify:

• 30 mm - nominal shaft diameter

• 48 mm - nominal housing bore diameter

• 8 mm - seal width

All three dimensions must be checked when selecting a replacement radial shaft seal.

What is FPM?

FPM is a fluoroelastomer used in sealing applications requiring increased resistance to temperature, oils, fuels and many chemicals.

Typical advantages of FPM include good resistance to many:

• mineral oils

• lubricating greases

• fuels

• hydrocarbons

• chemicals

Compared with standard NBR, FPM is often selected for applications involving higher operating temperatures or more demanding chemical environments.

Compatibility must always be verified for the specific medium, concentration, temperature and operating conditions.

What does TC mean in an oil seal?

TC is a commonly used designation for a double-lip radial shaft seal.

The construction incorporates:

• spring-loaded primary sealing lip

• additional secondary dust lip

• elastomer-covered outside diameter

The primary lip provides the main sealing function against the rotating shaft.

The secondary lip helps protect the sealing area against dust, dirt and external contaminants.

How does a 30x48x8 FPM TC oil seal work?

The seal is installed in a housing with a nominal bore diameter of 48 mm and operates against a shaft with a nominal diameter of 30 mm.

The garter spring maintains pressure of the primary sealing lip against the shaft surface. During shaft rotation, the lip forms the principal sealing interface and helps retain a compatible lubricant or other medium.

The additional dust lip provides a second barrier on the external side of the sealing system.

TC double lip construction

The TC design combines two separate sealing functions.

Primary lip

The spring-loaded primary lip operates directly against the rotating shaft and provides the main sealing function.

Secondary lip

The additional lip is positioned toward the external side and helps limit the ingress of contamination into the primary sealing area.

This makes the TC configuration particularly useful where the shaft seal is exposed to dust or general environmental contamination.

FPM TC vs NBR TC

FPM and NBR TC seals can have identical dimensions and similar construction, but their material properties differ.

FPM is commonly selected where increased thermal or chemical resistance is required.

NBR is widely used in conventional oil and grease sealing applications under moderate operating conditions.

Material selection should always consider:

• sealed medium

• operating temperature

• shaft speed

• pressure conditions

• environmental exposure

The same 30x48x8 mm dimensions do not make NBR and FPM versions technically identical.

TC vs single-lip oil seal

The main distinction is the additional secondary lip.

A conventional single-lip radial shaft seal primarily provides sealing against the operating medium.

The TC double-lip design adds an auxiliary dust lip that provides additional protection against contamination entering from outside the assembly.

The secondary lip does not replace specialized sealing arrangements required for highly contaminated environments.

Typical applications

30x48x8 FPM TC radial shaft seals may be used in rotating mechanical assemblies such as:

• gearboxes

• reduction gears

• electric motors

• pumps

• drive systems

• industrial machinery

• mechanical equipment

• oil- and grease-lubricated assemblies

Suitability for a specific application depends on the medium, temperature, shaft speed, pressure, shaft surface and operating environment.

How to select a 30x48x8 FPM TC oil seal

Before ordering, verify:

• shaft diameter: 30 mm

• housing bore diameter: 48 mm

• width: 8 mm

• TC double-lip construction

• FPM material

• sealed medium

• operating temperature

• shaft speed

• pressure

• shaft surface condition

• environmental contamination

Dimensions alone are not sufficient to guarantee complete interchangeability between different radial shaft seals.

Alternative designations and search references

This product may also be searched as:

• 30x48x8 FPM TC oil seal

• FPM TC 30x48x8

• TC 30x48x8 FPM

• 30x48x8 FPM oil seal

• 30x48x8 double lip oil seal

• 30x48x8 radial shaft seal

• 30x48x8 shaft seal

• 30x48x8 FPM shaft seal

• 30x48x8 FKM oil seal

• double lip radial shaft seal 30x48x8

• FPM shaft seal 30x48x8

When selecting an alternative seal, dimensions, material and lip configuration should all be verified.

Installation

Before installation, clean the shaft and housing bore thoroughly.

The shaft surface in contact with the sealing lip should be free from:

• burrs

• sharp edges

• corrosion

• scratches

• other surface damage

The seal should be pressed evenly into the housing without tilting.

The sealing lip must be protected from cutting, folding or deformation during assembly.

Do not apply direct impact to the sealing surfaces.

FAQ

What are the dimensions of the 30x48x8 FPM TC oil seal?

The seal measures 30x48x8 mm: 30 mm shaft diameter, 48 mm housing bore diameter and 8 mm width.

What material is the seal made from?

The sealing element is manufactured from FPM fluoroelastomer.

What does TC mean?

TC is a commonly used designation for a double-lip radial shaft seal with a spring-loaded primary sealing lip and an additional dust lip.

Is 30x48x8 FPM TC a double-lip oil seal?

Yes. The TC construction incorporates a primary sealing lip and an additional secondary dust lip.

Does the primary lip have a spring?

Yes. The main sealing lip is supported by a garter spring.

What is the purpose of the second lip?

The secondary lip helps protect the primary sealing area against dust, dirt and other external contaminants.

Is FPM suitable for oil?

FPM provides good resistance to many mineral oils and lubricants. Compatibility should always be confirmed for the specific medium and operating temperature.

Are all 30x48x8 oil seals interchangeable?

No. Dimensions are only part of the selection process. Material, lip configuration, outside diameter design and operating requirements must also be considered.

30x48x8 FPM TC - key information

30x48x8 FPM TC is a double-lip radial shaft seal manufactured from FPM fluoroelastomer. It has a 30 mm shaft diameter, 48 mm housing diameter and 8 mm width. The TC design combines a spring-loaded primary sealing lip with an additional dust lip, providing lubricant retention and supplementary protection against external contamination.

Available from simmering.pl, a specialist supplier of seals, bearings and industrial components. Stock in Poland with worldwide shipping.