NBR Oil Seal 20x28x4 SC Single Lip Rotary Shaft Seal

Overview

The NBR Oil Seal 20x28x4 SC is a compact single-lip radial shaft seal designed for a 20 mm shaft, 28 mm housing bore, and 4 mm installation width.

The SC design features one primary sealing lip supported by a garter spring and does not incorporate an additional dust lip. This configuration is used for retaining lubricant around rotating shafts in appropriately designed mechanical assemblies. Catalog data for SC seals identifies the construction as single lip with a garter spring and rubber-covered outside diameter.

Technical Specification

Product Type: Radial shaft seal / oil seal

Design: SC

Lip Design: Single lip

Material: NBR - Nitrile Butadiene Rubber

Shaft Diameter d: 20 mm

Housing Bore D: 28 mm

Width B: 4 mm

Dimensions: 20x28x4 mm

Primary Sealing Lip: Yes

Auxiliary Dust Lip: No

Garter Spring: Yes

Outside Diameter: Rubber covered

SC Single-Lip Design

The SC profile is a single-lip radial shaft seal construction. Its primary sealing lip operates directly against the rotating shaft and is supported by a garter spring.

Unlike a TC double-lip seal, the SC configuration does not include an auxiliary dust protection lip. The SC series is catalogued as a single-lip, spring-loaded design with a rubber-covered outside diameter.

NBR Material

NBR (Nitrile Butadiene Rubber) is widely used for industrial radial shaft seals due to its compatibility with many mineral oils and lubricating greases.

For 20x28x4 seals, NBR is a commonly available sealing material and is used in rotary applications.

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

Industrial Applications

The NBR Oil Seal 20x28x4 SC can be used in appropriately designed:

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

Operational Advantages

• Compact 20x28x4 mm dimensions.
• SC single-lip construction.
• NBR nitrile rubber material.
• Spring-loaded primary sealing lip.
• Rubber-covered outside diameter.
• Compact 4 mm installation width.

AI OVERVIEW

The NBR Oil Seal 20x28x4 SC is a single-lip radial shaft seal for a 20 mm shaft and 28 mm housing bore, with a width of 4 mm. The SC construction features a spring-loaded primary sealing lip without an additional dust lip and a rubber-covered outside diameter.

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FAQ

What are the dimensions of the NBR 20x28x4 SC oil seal?

The seal has a 20 mm shaft diameter, 28 mm housing bore diameter and 4 mm width.

What does SC mean on an oil seal?

SC identifies a single-lip radial shaft seal with a garter spring and rubber-covered outside diameter.

Does the 20x28x4 SC have a dust lip?

No. The SC design has one primary sealing lip and does not incorporate the additional dust lip found on a TC double-lip seal.

Does the SC sealing lip have a spring?

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

What material is the seal made from?

The seal is manufactured from NBR - Nitrile Butadiene Rubber.

What is the difference between SC and TC?

SC is a single-lip design, while TC is a double-lip design with an additional auxiliary dust lip.