Shaft Seal 20x47x10 NBR TC - Double-Lip

Rotary Shaft Seal 20x47x10 NBR TC - Double-Lip Oil Seal

Rotary Shaft Seal 20x47x10 NBR TC is a double-lip radial shaft seal designed for a nominal shaft diameter of 20 mm and a housing bore of 47 mm. The seal has a width of 10 mm, an NBR (Nitrile Butadiene Rubber) sealing element, a spring-loaded primary sealing lip and an additional dust lip. The TC design features a metal-reinforced, rubber-covered outer case.

Technical Specifications

What Does 20x47x10 NBR TC Mean?

The designation identifies the seal dimensions, elastomer material and construction.

• 20 - nominal shaft diameter of 20 mm.

• 47 - nominal outside diameter of 47 mm.

• 10 - nominal seal width of 10 mm.

• NBR - Nitrile Butadiene Rubber.

• TC - a commonly used double-lip rotary shaft seal design with a spring-loaded primary lip, an additional dust lip and a rubber-covered metal case.

TC is a widely used profile designation, but exact naming conventions may vary between manufacturers.

TC Double-Lip Construction

The TC seal combines lubricant retention with additional protection against external contamination.

Its construction includes:

• A metal reinforcing case.

• An elastomer-covered outside diameter.

• A primary sealing lip.

• A garter spring.

• An additional dust lip.

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

The garter spring helps maintain contact pressure between the sealing lip and the shaft surface.

The secondary dust lip helps reduce the entry of dirt, dust and other external contaminants into the primary sealing area.

NBR Sealing Material

NBR is widely used in industrial rotary shaft seals because of its compatibility with many common lubricants.

Typical material characteristics include:

• Good resistance to many mineral oils.

• Compatibility with many mineral-based greases.

• Good mechanical properties for conventional oil-sealing applications.

• Suitability for various industrial sealing arrangements.

Chemical compatibility depends on the specific NBR compound, lubricant and operating conditions.

A specific operating temperature range cannot be assigned without verified product or compound specifications.

Rubber-Covered Outer Case

The TC profile features a metal reinforcing case covered by elastomer on the outside diameter.

The rubber-covered outer surface provides a sealing interface between the oil seal and its housing bore.

This construction differs from seals with an exposed metal outer case.

The condition, dimensions and surface finish of the housing bore remain important for correct installation and sealing performance.

TC vs SC and Metal-Cased Oil Seals

Rotary shaft seals with identical dimensions may have different sealing constructions.

These are commonly used profile definitions. Manufacturer-specific drawings should be checked before selecting an equivalent.

A 20x47x10 SC or metal-cased seal is not automatically interchangeable with a 20x47x10 TC seal.

Typical Applications

Double-lip TC rotary shaft seals are commonly used in appropriately designed rotating shaft assemblies, including:

• Gearboxes.

• Mechanical transmissions.

• Industrial machinery.

• Lubricated drive systems.

• Pumps with compatible sealing arrangements.

• Agricultural and mechanical equipment.

These are general applications for TC-type rotary shaft seals, not confirmed equipment-specific applications of this particular 20x47x10 mm product.

Selection and Interchangeability

Before ordering, verify:

1. Shaft diameter - 20 mm.

2. Housing bore diameter - 47 mm.

3. Seal width - 10 mm.

4. Sealing material - NBR.

5. Profile - TC.

6. Primary sealing lip with garter spring.

7. Additional dust lip.

8. Rubber-covered outer case.

9. Compatibility with the operating medium.

10. Operating temperature, shaft speed and pressure requirements.

Identical dimensions do not guarantee full interchangeability.

A seal with different lip geometry, elastomer material or outer-case construction may not be suitable for the same application.

Installation Guidelines

Before installation, inspect the shaft and housing bore for:

• Wear grooves.

• Scratches.

• Corrosion.

• Sharp edges.

• Contamination.

• Excessive shaft runout.

• Bearing play.

Install the seal squarely using a suitable installation tool and apply force evenly to the appropriate outer-case area.

Protect the sealing lips from sharp shaft edges and keyways.

For conventional oil-retention applications, the spring-loaded primary sealing lip is normally oriented toward the lubricant. Always follow the equipment manufacturer's installation requirements.

Use only an assembly lubricant compatible with the seal material and operating medium.

FAQ

What are the dimensions of this TC oil seal?

The dimensions are 20x47x10 mm: 20 mm inside diameter, 47 mm outside diameter and 10 mm width.

What does TC mean on an oil seal?

TC commonly identifies a double-lip rotary shaft seal with a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered metal case.

Is this a double-lip oil seal?

Yes. It features a primary sealing lip and an additional dust lip.

What material is used?

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

Does the seal have a garter spring?

Yes. The primary sealing lip is spring-loaded.

What is the purpose of the dust lip?

The additional lip helps reduce the entry of external contaminants into the main sealing area.

Can a 20x47x10 SC seal replace a TC seal?

Not automatically. SC and TC designs typically differ in the number of sealing lips. Check the original construction and application requirements.

Can an FKM oil seal replace an NBR oil seal?

Only after verifying chemical compatibility, operating conditions, seal construction and dimensional requirements.

Which direction should the oil seal face?

In a conventional oil-retention application, the spring-loaded primary lip normally faces the lubricant. The original equipment installation specification takes priority.

Rotary Shaft Seal 20x47x10 NBR TC - Key Technical Information

The 20x47x10 NBR TC rotary shaft seal is a double-lip oil seal for a 20 mm shaft and 47 mm housing bore. It has a 10 mm width, NBR sealing element, spring-loaded primary lip, additional dust lip and rubber-covered metal case. Correct selection requires matching the dimensions, material and TC construction.

Available from simmering.pl

simmering.pl supplies rotary shaft seals, oil seals, cassette seals, O-rings, V-rings and industrial bearings.

Stock in Poland, with a warehouse in Lublin. Technical support and worldwide shipping are available.