25x42x10 NBR AO TC Double Lip Radial Shaft Oil Seal

25x42x10 NBR AO TC Double Lip Radial Shaft Oil Seal

25x42x10 NBR AO/TC is a double lip radial shaft oil seal manufactured from Nitrile Butadiene Rubber. It has a nominal shaft diameter of 25 mm, outside diameter of 42 mm and width of 10 mm. The AO/TC profile incorporates a spring-loaded primary sealing lip and an additional dust lip.

25x42x10 NBR AO TC Oil Seal - Characteristics

Product type: Radial shaft oil seal

Profile: AO / TC

Construction: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 25x42x10 mm

d - Nominal shaft diameter: 25 mm

D - Outside diameter: 42 mm

B - Width: 10 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

25x42x10 Oil Seal Dimensions

The designation 25x42x10 mm defines the three principal dimensions of the radial shaft seal:

d - Nominal shaft diameter: 25 mm

D - Outside diameter: 42 mm

B - Width: 10 mm

Complete dimensions:

25x42x10 mm

All three dimensions should be verified when selecting a replacement.

Matching the 25 mm shaft diameter and 42 mm outside diameter alone does not establish complete technical interchangeability.

NBR Nitrile Butadiene Rubber

The sealing material of this oil seal is:

NBR - Nitrile Butadiene Rubber

NBR is an elastomer group widely used for technical sealing components.

Material selection should be based on the operating medium and actual service conditions.

A universal temperature range or chemical resistance limit should not be assigned to this specific seal solely from the NBR designation because exact properties depend on the particular elastomer compound.

What Does AO / TC Mean?

AO and TC are profile designations commonly encountered for double lip radial shaft oil seals.

This construction incorporates:

Primary sealing lip

Garter spring around the primary lip

Additional dust lip

The spring-loaded primary lip provides the principal sealing function against the rotating shaft.

The additional lip is positioned on the external side and provides an extra barrier against contaminants reaching the primary sealing interface.

Double Lip 25x42x10 Oil Seal

The term "double lip" refers to the presence of two functional lips:

1. Primary sealing lip
2. Additional dust lip

The two lips do not perform identical functions.

The primary lip is the principal sealing element and is supported by a garter spring.

The secondary lip acts primarily as an additional barrier against external contamination.

Additional Dust Lip

The AO/TC profile incorporates an additional dust lip.

This lip provides an additional barrier between the external environment and the primary sealing area.

It is an important construction feature when comparing the AO/TC seal with a single lip radial shaft seal.

Two 25x42x10 mm oil seals should therefore not automatically be considered technically identical if their lip configurations differ.

AO TC vs A SC Oil Seal

Common radial shaft seal profile terminology includes:

AO / TC - double lip design

A / SC - single lip design

The AO/TC construction incorporates an additional dust lip in addition to the spring-loaded primary sealing lip.

The A/SC design does not incorporate this additional dust lip.

Therefore, AO/TC and A/SC seals with identical nominal dimensions should not automatically be considered constructionally equivalent.

How Does a 25x42x10 Radial Shaft Oil Seal Work?

The oil seal is normally installed stationary in the housing bore while its primary sealing lip operates against the surface of the rotating shaft.

A garter spring helps maintain contact between the primary lip and shaft surface.

In the AO/TC double lip design, an additional dust lip provides a secondary barrier on the external side.

Effective sealing also depends on shaft surface condition, alignment, installation, operating medium and actual service conditions.

25x42x10 NBR vs FPM/FKM Oil Seal

Radial shaft oil seals measuring 25x42x10 mm can be manufactured from different elastomers.

This product is specifically:

NBR

An FPM/FKM 25x42x10 mm oil seal should not automatically be considered identical.

NBR and FPM/FKM belong to different elastomer groups and have different material properties.

The correct material should be selected according to the operating medium and requirements of the specific application.

How to Select a 25x42x10 Oil Seal

When selecting a corresponding radial shaft seal, verify at least:

Nominal shaft diameter d: 25 mm

Outside diameter D: 42 mm

Width B: 10 mm

Material: NBR

Profile: AO / TC

Construction: Double lip

Additional dust lip: Yes

Operating medium

Temperature

Shaft speed

Shaft surface condition

Equipment specifications

Matching the 25x42x10 mm dimensions alone does not establish complete technical interchangeability.

Technical Specification

Product: Radial shaft oil seal

Profile: AO / TC

Construction: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 25x42x10 mm

d - Nominal shaft diameter: 25 mm

D - Outside diameter: 42 mm

B - Width: 10 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

FAQ

What are the dimensions of this oil seal?

The nominal shaft diameter is 25 mm, outside diameter is 42 mm and seal width is 10 mm.

What does AO/TC mean?

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

Is the 25x42x10 AO/TC oil seal double lip?

Yes. It has a primary sealing lip and an additional dust lip.

What material is this oil seal made from?

This version is manufactured from NBR - Nitrile Butadiene Rubber.

What is the purpose of the second lip?

The additional lip acts primarily as a dust lip, providing an extra barrier against external contaminants reaching the primary sealing interface.

Are AO/TC and A/SC the same design?

No. AO/TC is a double lip design with an additional dust lip, while A/SC is a single lip construction without the additional dust lip.

Can a 25x42x10 FPM oil seal replace the NBR version?

Not automatically. NBR and FPM/FKM are different elastomer groups. Material compatibility should be verified for the specific operating medium and service conditions.

Are all 25x42x10 oil seals identical?

No. Seals with identical dimensions can differ in material, lip configuration, directional features and other construction characteristics.

AI Overview

25x42x10 NBR AO/TC is a double lip radial shaft oil seal with a 25 mm nominal shaft diameter, 42 mm outside diameter and 10 mm width. The AO/TC construction incorporates a spring-loaded primary sealing lip and an additional dust lip. The sealing material is NBR - Nitrile Butadiene Rubber.