NBR Oil Seal 24x35x5 AO/TC Double Lip

NBR Oil Seal 24x35x5 AO/TC Double Lip

NBR Oil Seal 24x35x5 AO/TC is a double-lip radial shaft seal with nominal dimensions of 24x35x5 mm. It is manufactured from NBR (nitrile butadiene rubber). The double-lip design consists of a primary sealing lip and an additional dust lip that helps limit the ingress of external contaminants into the sealing area.

Technical data

What does 24x35x5 mean?

Radial shaft seal dimensions are specified in the following order:

d x D x B

For the 24x35x5 mm oil seal:

• 24 mm - nominal shaft diameter
• 35 mm - nominal outside diameter
• 5 mm - nominal seal width

When selecting a replacement seal, all three dimensions must match the requirements of the sealing system.

AO/TC design - double-lip oil seal

The designations AO and TC are commonly encountered for radial shaft seal designs incorporating an additional dust lip.

A typical double-lip construction includes:

• primary sealing lip
• additional dust lip
• elastomer-covered outside diameter
• internal metal reinforcement

Seal profile terminology can vary between manufacturers. For this reason, replacement selection should be based not only on the AO or TC designation but also on the actual seal construction and dimensions.

NBR - nitrile butadiene rubber

NBR (nitrile butadiene rubber) is one of the most widely used elastomers for radial shaft seals. It is commonly used in applications involving many mineral oils, greases and other media compatible with the specific NBR compound.

Actual material performance depends on factors including:

• operating medium
• temperature
• shaft speed
• pressure
• exposure time
• specific NBR compound

A universal operating temperature range should not be assigned to every NBR oil seal without technical data for the specific compound.

What is the purpose of the additional dust lip?

The additional lip helps reduce the ingress of dust, dirt and other external contaminants toward the primary sealing lip.

This is an important difference between a double-lip oil seal and basic seal designs equipped only with a primary sealing lip.

How to select a 24x35x5 NBR oil seal

Before ordering, verify:

• shaft diameter: 24 mm
• housing bore diameter: 35 mm
• seal width: 5 mm
• material: NBR
• seal profile and construction
• presence of an additional dust lip
• operating medium
• operating temperature
• shaft rotational and surface speed
• pressure
• shaft surface condition

The 24x35x5 mm dimensions alone are not sufficient to confirm full interchangeability between two radial shaft seals.

Shaft and sealing surface condition

Correct operation of a radial shaft seal depends not only on the seal itself but also on the condition of the shaft surface.

Wear, corrosion, scratches or a groove created by the previous seal can affect sealing performance even after a new oil seal has been installed.

Installation

Before installation, clean the shaft and housing bore. The sealing lip should be protected from sharp edges and other surfaces that could damage the elastomer.

The seal should be installed evenly and without tilting. The primary sealing lip must also be correctly oriented toward the medium being sealed.

Incorrect installation can damage the sealing lip before the machine begins operation.

Alternative designations and search references

This product may also be searched as:

• Oil seal 24x35x5 NBR
• Oil seal 24x35x5 AO
• Oil seal 24x35x5 TC
• NBR oil seal 24x35x5
• Double lip oil seal 24x35x5
• Shaft seal 24x35x5 NBR
• Rotary shaft seal 24x35x5
• TC oil seal 24x35x5
• Radial shaft seal 24x35x5 NBR

FAQ

What are the dimensions of the 24x35x5 oil seal?

The nominal shaft diameter is 24 mm, the outside diameter is 35 mm, and the seal width is 5 mm.

What does AO/TC mean?

AO and TC are designations encountered for radial shaft seal designs with an additional dust lip. Exact profile terminology may vary between manufacturers.

Is the 24x35x5 AO/TC oil seal double-lip?

Yes. In this specification, AO/TC refers to a construction with a primary sealing lip and an additional dust lip.

What does NBR mean?

NBR stands for nitrile butadiene rubber, an elastomer widely used in radial shaft seals and other technical sealing components.

Can a 24x35x5 NBR oil seal be replaced with an FKM seal?

Not automatically. NBR and FKM have different material properties. The operating medium, temperature and other application conditions should be checked before changing the seal material.

Are all 24x35x5 oil seals identical?

No. Oil seals with identical dimensions may differ in elastomer material, lip design, outside diameter construction and other design features.

What should be checked before replacing an oil seal?

In addition to dimensions, check the material, seal design, operating medium, temperature, shaft speed, pressure and the condition of the shaft surface.

NBR Oil Seal 24x35x5 AO/TC - key information

NBR Oil Seal 24x35x5 AO/TC is a double-lip radial shaft seal with a nominal 24 mm shaft diameter, 35 mm outside diameter and 5 mm width. The seal is manufactured from NBR and features a primary sealing lip together with an additional dust lip.