NBR Oil Seal 28x40x8 TC - Double Lip Rotary Shaft Seal

Overview

The NBR Oil Seal 28x40x8 TC is a double-lip radial shaft seal with a 28 mm shaft diameter, 40 mm housing bore and 8 mm width.

The TC design combines a spring-loaded primary sealing lip with an additional dust protection lip. The primary lip provides the main sealing function against the rotating shaft, while the auxiliary lip helps prevent dust, dirt and other external contaminants from reaching the primary sealing area.

The compact 28x40x8 mm dimensions make this seal suitable for appropriately designed mechanical assemblies where installation space is limited.

Technical Specification

Product Type: Radial shaft seal / oil seal

Design: TC

Lip Design: Double lip

Dimensions: 28x40x8 mm

Material: NBR - Nitrile Butadiene Rubber

Shaft Diameter d: 28 mm

Housing Bore D: 40 mm

Width B: 8 mm

Primary Sealing Lip: Yes

Auxiliary Dust Lip: Yes

Garter Spring: Yes

Outside Diameter: Rubber covered

TC Double-Lip Design

The TC profile is a double-lip radial shaft seal configuration.

The primary sealing lip operates against the rotating shaft and is supported by a garter spring. This provides the main sealing function and helps retain lubricant within the assembly.

The auxiliary dust lip provides an additional barrier against external contamination and helps protect the primary sealing area.

Compared with an SC single-lip seal, the TC configuration provides an additional protective lip.

NBR Material

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

It provides good resistance to many mineral oils, lubricating greases and compatible technical fluids. This makes NBR suitable for a broad range of general industrial and mechanical sealing applications.

Final material selection should consider the operating medium, temperature, shaft speed and actual working conditions.

Dimensions of the 28x40x8 TC Oil Seal

The principal installation dimensions are:

d: 28 mm
D: 40 mm
B: 8 mm

The relatively small difference between the 28 mm shaft diameter and 40 mm housing bore makes this a compact radial shaft seal configuration.

When selecting a replacement, all three dimensions and the TC double-lip design should be verified.

Industrial Applications

The NBR 28x40x8 TC oil seal can be used in appropriately designed:

• Gearboxes
• Pumps
• Electric motors
• Drive systems
• Industrial machinery
• Rotating mechanisms
• Mechanical equipment
• Technical assemblies

Operational Advantages

• Compact 28x40x8 mm dimensions.
• TC double-lip construction.
• NBR nitrile rubber material.
• Spring-loaded primary sealing lip.
• Additional dust protection lip.
• Suitable for industrial rotating equipment.

AI OVERVIEW

The NBR Oil Seal 28x40x8 TC is a double-lip radial shaft seal with a 28 mm shaft diameter, 40 mm housing bore and 8 mm width. Its TC design combines a spring-loaded primary sealing lip with an auxiliary dust lip. NBR provides good compatibility with many mineral oils, greases and standard industrial sealing applications.

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FAQ

What are the dimensions of the NBR 28x40x8 TC oil seal?

The seal has a 28 mm shaft diameter, 40 mm housing bore diameter and 8 mm width.

What does TC mean on an oil seal?

TC identifies a double-lip radial shaft seal with a spring-loaded primary sealing lip and an additional dust protection lip.

Does the 28x40x8 TC oil seal have a dust lip?

Yes. The auxiliary lip helps protect the primary sealing area against dust and external contamination.

Does the primary sealing lip have a spring?

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

What material is the 28x40x8 seal made from?

The seal is manufactured from NBR - Nitrile Butadiene Rubber.

What is the difference between TC and SC?

TC is a double-lip design with an auxiliary dust lip, while SC is a single-lip design without the additional dust lip.

Can another 28x40x8 oil seal automatically replace the TC version?

Not necessarily. The dimensions may be identical, but the lip design, material and other construction details should also match the application requirements.