NBR Oil Seal 25x42x7 TC - Double Lip Rotary Shaft Seal

Overview

The NBR Oil Seal 25x42x7 TC is a double-lip radial shaft seal with a 25 mm shaft diameter, 42 mm housing bore and 7 mm width.

The TC design combines a spring-loaded primary sealing lip with an auxiliary dust lip. The primary lip operates directly against the rotating shaft and provides the main sealing function, helping retain lubricant within the assembly. The additional lip helps protect the primary sealing area against dust, dirt and other external contaminants.

Technical Specification

Product Type: Radial shaft seal / oil seal
Design: TC
Lip Design: Double lip
Dimensions: 25x42x7 mm
Material: NBR - Nitrile Butadiene Rubber
Shaft Diameter d: 25 mm
Housing Bore D: 42 mm
Width B: 7 mm
Primary Sealing Lip: Yes
Auxiliary Dust Lip: Yes
Garter Spring: Yes
Outside Diameter: Rubber covered

TC Double-Lip Design

The TC profile incorporates two functional sealing lips.

The primary sealing lip operates against the rotating shaft and is supported by a garter spring to maintain sealing contact during operation.

The auxiliary dust lip provides an additional barrier between the external environment and the primary sealing area. It helps reduce the ingress of dust and other contaminants.

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

Dimensions of the 25x42x7 Oil Seal

The principal installation dimensions are:

d: 25 mm
D: 42 mm
B: 7 mm

The seal is designed for a 25 mm shaft and 42 mm housing bore.

When selecting a replacement, all three dimensions should be verified together with the TC double-lip design and NBR material. A 25x42x7 seal with a different material or lip configuration should not automatically be considered interchangeable.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers in radial shaft sealing technology.

It provides good resistance to many mineral oils, lubricating greases and compatible technical fluids. NBR oil seals are therefore commonly used in industrial machinery, gearboxes, pumps and drive systems.

Final suitability depends on the operating medium, temperature, shaft speed and actual working conditions.

Industrial Applications

The NBR 25x42x7 TC oil seal can be used in appropriately designed:

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

Operational Advantages

• 25x42x7 mm dimensions.
• TC double-lip construction.
• NBR nitrile rubber material.
• Spring-loaded primary sealing lip.
• Auxiliary dust protection lip.
• Designed for a 25 mm shaft.

AI OVERVIEW

The NBR Oil Seal 25x42x7 TC is a double-lip radial shaft seal with a 25 mm shaft diameter, 42 mm housing bore and 7 mm width. Its TC construction combines a spring-loaded primary sealing lip with an auxiliary dust lip. NBR is widely used for industrial sealing applications involving compatible mineral oils and lubricating greases.

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FAQ

What are the dimensions of the NBR 25x42x7 TC oil seal?

The seal has a 25 mm shaft diameter, 42 mm housing bore diameter and 7 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 auxiliary dust lip.

Does the 25x42x7 TC oil seal have a dust lip?

Yes. The additional lip helps protect the primary sealing area against dust, dirt 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 25x42x7 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 any 25x42x7 oil seal be used as a replacement?

Not necessarily. The dimensions, material, lip configuration and operating requirements should all be verified before replacement.