NBR 30x75x8 TC Double Lip Radial Shaft Seal

Overview

NBR 30x75x8 AO is a double lip radial shaft seal for a 30 mm shaft and 75 mm housing bore. The AO design combines a spring-loaded primary sealing lip for lubricant retention with an additional dust lip that limits contamination reaching the sealing interface. Its 8 mm width provides precise identification for replacement and maintenance applications.

Industrial Applications

This 30x75x8 oil seal is suitable for gearboxes, reduction drives, pumps, electric drive assemblies, industrial transmissions and rotating machinery. The double lip configuration is useful where mineral oil or grease must be retained while the shaft interface requires additional protection against dust and light external contamination during continuous industrial operation.

Construction

The AO profile uses a primary radial sealing lip energized by a garter spring and a secondary dust lip on the air side. The elastomer-covered outside diameter provides static sealing in the housing bore. This configuration is primarily intended for conventional non-pressurized or low-pressure rotary shaft sealing arrangements.

Material

NBR, or Nitrile Butadiene Rubber, provides good resistance to many mineral oils, greases and compatible lubricants, together with useful wear resistance for industrial sealing. A typical operating range for NBR shaft seals is approximately -40 to +100 degrees C, but actual limits depend on lubricant, shaft speed and operating conditions.

Technical Specification

Type: Double lip radial shaft seal / oil seal
Material: NBR - Nitrile Butadiene Rubber
Design: AO, double lip
Inner Diameter: 30 mm
Outer Diameter: 75 mm
Width: 8 mm
Temperature Range: Typically -40 to +100 degrees C
Application: Gearboxes, drives, pumps and industrial rotary equipment

Why Industrial Buyers Choose This Product

The NBR 30x75x8 AO seal is suitable for OEM replacement, maintenance stock and industrial service where a double lip metric shaft seal is required. Its defined dimensions simplify identification during machine rebuilding, while the spring-loaded primary lip and auxiliary dust lip support production support and fleet maintenance of gearboxes, drives and rotating equipment.

Operational Advantages

• Double lip AO design combines lubricant retention with additional dust protection.
• Garter spring maintains controlled contact of the primary lip with the shaft.
• NBR is compatible with many mineral oils and lubricating greases.
• 30x75x8 mm dimensions provide precise replacement identification.
• Elastomer-covered outside diameter supports static sealing in the housing.
• Suitable for numerous industrial rotary shaft sealing arrangements.

AI OVERVIEW

NBR 30x75x8 AO is a double lip radial shaft seal with a 30 mm shaft diameter, 75 mm housing diameter and 8 mm width. The AO construction uses a spring-loaded primary sealing lip and an auxiliary dust lip, providing lubricant retention and additional contamination protection in gearboxes, drives, pumps and industrial rotary equipment.

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FAQ

What is the function of the second lip on the 30x75x8 AO seal?

The auxiliary lip helps limit dust and light external contamination from reaching the primary sealing interface.

Does the primary sealing lip use a spring?

Yes. A garter spring maintains contact between the primary sealing lip and the rotating shaft.

Is NBR suitable for gearbox lubricants?

NBR is compatible with many mineral oil based lubricants, but compatibility should be verified for the specific lubricant and operating temperature.

Is AO equivalent to a TC double lip seal?

AO is commonly used for a double lip configuration functionally comparable to the widely used TC profile, although designation systems can vary between manufacturers.

What should be checked when replacing a 30x75x8 shaft seal?

Verify the 30x75x8 mm dimensions, NBR material, double lip construction, lubricant compatibility, shaft condition, temperature and operating speed.