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

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

30x48x8 NBR TC Oil Seal is a double-lip radial shaft seal with dimensions 30x48x8 mm, manufactured from NBR (Nitrile Butadiene Rubber). The TC design features a spring-loaded primary sealing lip and an additional dust lip. It is designed for rotating shaft applications, particularly where oil or grease retention and additional protection against external contamination are required.

Technical data - 30x48x8 NBR TC

30x48x8 NBR TC dimensions

The designation 30x48x8 mm defines the three principal installation dimensions:

• d - shaft diameter: 30 mm

• D - housing bore diameter: 48 mm

• B - seal width: 8 mm

Complete size:

30x48x8 mm

All three dimensions, together with the material and lip design, should be verified when selecting a replacement oil seal.

What is NBR?

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for radial shaft seals and oil seals.

NBR provides good resistance to many:

• mineral oils

• lubricating greases

• mineral oil-based hydraulic fluids

• fuels

Its combination of oil resistance, mechanical properties and cost effectiveness makes NBR a standard material for many industrial oil sealing applications.

Compatibility should always be checked against the specific medium, temperature and operating conditions.

What does TC mean in an oil seal?

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

The typical TC 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 primary sealing area against dust, dirt and other external contaminants.

How does a 30x48x8 NBR TC oil seal work?

The seal is installed in a housing with a nominal bore diameter of 48 mm, while the primary sealing lip operates against a rotating shaft with a nominal diameter of 30 mm.

A garter spring supports the primary sealing lip and helps maintain contact with the shaft surface.

During operation, the primary lip helps retain oil, grease or another compatible medium inside the assembly.

The additional dust lip provides a supplementary barrier against contamination entering from the external side.

Double lip TC construction

The TC design combines two sealing functions.

Primary sealing lip

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

Secondary dust lip

The additional lip faces the external environment and helps protect the primary sealing area from dust and contamination.

This double-lip configuration is commonly used where both lubricant retention and additional external protection are required.

NBR TC vs FKM TC

NBR and FKM oil seals may have identical dimensions and the same TC configuration, but the elastomer materials have different properties.

NBR is widely used for standard oil and grease sealing applications and offers good resistance to many mineral oils and lubricants.

FKM, commonly searched for in English-speaking markets as Viton or Viton type, is generally selected where greater resistance to elevated temperatures, fuels or demanding chemical environments is required.

Material selection should be based on the actual medium, operating temperature, shaft speed and application conditions.

A 30x48x8 NBR TC and a 30x48x8 FKM TC should therefore not automatically be considered technically identical simply because their dimensions are the same.

TC vs single lip oil seal

The principal difference is the additional dust lip.

A conventional single-lip oil seal primarily provides sealing of the operating medium.

The TC double-lip design adds a secondary lip that helps reduce the ingress of:

• dust

• dirt

• fine particles

• general environmental contamination

The secondary lip provides additional protection but does not replace specialized sealing systems for heavily contaminated operating environments.

Typical applications

30x48x8 NBR TC oil seals can be used in many rotating mechanical assemblies, including:

• gearboxes

• reduction gears

• electric motors

• pumps

• drive systems

• industrial machinery

• mechanical equipment

• oil-lubricated assemblies

• grease-lubricated assemblies

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

How to select a 30x48x8 NBR TC oil seal

Before ordering, verify:

• shaft diameter: 30 mm

• housing bore diameter: 48 mm

• width: 8 mm

• NBR material

• TC double-lip design

• sealed medium

• operating temperature

• shaft speed

• pressure conditions

• shaft surface condition

• environmental contamination

Identical 30x48x8 mm dimensions alone do not guarantee complete interchangeability between different oil seals.

Alternative designations and search references

This product may also be searched as:

• 30x48x8 NBR TC oil seal

• NBR TC 30x48x8

• TC 30x48x8 NBR

• 30x48x8 NBR oil seal

• 30x48x8 double lip oil seal

• 30x48x8 radial shaft seal

• 30x48x8 shaft seal

• 30x48x8 NBR shaft seal

• NBR oil seal 30x48x8

• double lip radial shaft seal 30x48x8

• TC oil seal 30x48x8

• 30 48 8 oil seal

• 30mm oil seal

• 48mm OD oil seal

For correct identification, dimensions, material and lip configuration should all be verified.

Installation

Before installation, thoroughly clean the shaft and housing bore.

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

• burrs

• sharp edges

• corrosion

• deep 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 installation.

Do not apply direct impact to the sealing surfaces.

FAQ

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

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

What material is the 30x48x8 TC oil seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

What does TC mean in an oil seal?

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 NBR TC a double lip oil seal?

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

Does the 30x48x8 NBR TC seal have a spring?

Yes. The primary 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 NBR suitable for oil?

NBR provides good resistance to many mineral oils and lubricating greases and is widely used for oil sealing applications. Compatibility should still be verified for the specific medium and operating temperature.

What is the difference between NBR and FKM oil seals?

NBR is widely used for standard oil and grease applications. FKM, often searched for as Viton or Viton type, is generally used where greater resistance to elevated temperatures or demanding chemical conditions is required.

30x48x8 NBR TC - key information

30x48x8 NBR TC is a double-lip radial shaft seal for a 30 mm shaft and 48 mm housing bore, with an 8 mm width. The NBR construction is suitable for many conventional oil and grease sealing applications. The TC design combines a spring-loaded primary sealing lip with an additional dust lip for supplementary protection against external contamination.

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