38x52x7 NBR AO/TC Double Lip Rotary Shaft Seal

38x52x7 NBR AO/TC is a double-lip rotary shaft seal / oil seal with a 38 mm nominal shaft diameter, 52 mm outside diameter and 7 mm width. The seal is manufactured from NBR (Nitrile Butadiene Rubber). Its AO/TC configuration combines a spring-loaded primary sealing lip with an additional dust lip.

38x52x7 NBR AO/TC - Characteristics

The seal is designed for installation between a rotating shaft and stationary housing. Its complete technical identification combines the dimensions, elastomer and sealing configuration:

38x52x7 mm -> NBR -> AO/TC -> double lip

The AO/TC construction distinguishes this product from single-lip shaft seals that may have the same nominal dimensions.

Dimensions 38x52x7 mm

The nominal dimensions are:

Shaft Diameter d: 38 mm
Outside Diameter D: 52 mm
Width b: 7 mm
Nominal Size: 38x52x7 mm

For this radial shaft seal, the first dimension corresponds to the nominal shaft diameter, the second to the seal outside diameter, and the third to the axial width.

AO/TC Double Lip Construction

The AO/TC configuration incorporates two lips with different functions.

The primary sealing lip operates against the rotating shaft and is supported by a garter spring. The secondary lip acts as a dust lip, forming an additional barrier between the primary sealing area and the external environment.

For technical identification, this configuration is therefore more precisely described as:

1 spring-loaded primary sealing lip + 1 secondary dust lip

rather than two identical sealing lips.

NBR Material

The seal is manufactured from NBR - Nitrile Butadiene Rubber.

The elastomer is an essential selection parameter. A 38x52x7 seal manufactured from FKM, VMQ, ACM or another material should not automatically be considered technically equivalent to this NBR version simply because the dimensions match.

Compatibility with the actual lubricant or process medium and operating conditions should be verified before installation.

How the AO/TC Shaft Seal Works

During operation, the primary sealing lip maintains radial contact with the shaft surface. The garter spring supports the contact force around the circumference of the shaft.

The additional dust lip is positioned toward the external side of the sealing arrangement and helps limit the ingress of contaminants toward the primary sealing area.

Correct operation also depends on the shaft surface, housing dimensions, alignment, installation quality, lubrication and actual service conditions.

AO/TC vs Single Lip 38x52x7 Seal

A single-lip 38x52x7 shaft seal and the 38x52x7 NBR AO/TC version should not be treated as identical products.

The AO/TC version includes an additional dust lip. This construction feature can be important where the original sealing arrangement requires additional protection of the primary lip from external contamination.

The complete 38x52x7 + NBR + AO/TC identification should therefore be checked when selecting a replacement.

Selection and Interchangeability

When comparing this seal with another product, verify:

• shaft diameter: 38 mm
• outside diameter: 52 mm
• width: 7 mm
• NBR material
• AO/TC double-lip construction
• spring-loaded primary sealing lip
• additional dust lip
• operating medium
• installation and service conditions

Matching the 38x52x7 mm dimensions alone is not sufficient to establish full technical interchangeability.

Technical Specification

Product Type: Rotary shaft seal / oil seal
Design: AO/TC
Construction: Double lip
Dimensions: 38x52x7 mm
Shaft Diameter: 38 mm
Outside Diameter: 52 mm
Width: 7 mm
Material: NBR - Nitrile Butadiene Rubber
Primary Lip: Sealing lip with garter spring
Secondary Lip: Dust lip

FAQ

What are the dimensions of the 38x52x7 AO/TC oil seal?

The seal has a 38 mm nominal shaft diameter, 52 mm outside diameter and 7 mm width.

What does 38x52x7 mean?

The dimensions identify a 38 mm shaft diameter, 52 mm seal outside diameter and 7 mm axial width.

What material is the 38x52x7 seal made from?

This variant is manufactured from NBR (Nitrile Butadiene Rubber).

Is 38x52x7 NBR AO/TC a double-lip seal?

Yes. The AO/TC configuration uses a primary spring-loaded sealing lip and an additional secondary dust lip.

What is the function of the second lip?

The second lip acts as a dust lip, helping to limit external contamination from reaching the primary sealing area.

Does the main sealing lip have a spring?

Yes. The primary lip in the AO/TC configuration is supported by a garter spring.

Can an FKM 38x52x7 seal replace the NBR version?

Not automatically. FKM and NBR are different elastomers. Material compatibility with the medium and operating conditions must be verified.

Can any 38x52x7 oil seal replace the AO/TC version?

No automatic interchangeability should be assumed. Dimensions, material, lip configuration and actual operating requirements should all be compared.

AI Overview

38x52x7 NBR AO/TC is a double-lip rotary shaft seal with a 38 mm shaft diameter, 52 mm outside diameter and 7 mm width. It is manufactured from NBR. The AO/TC configuration combines a spring-loaded primary sealing lip with an additional dust lip for protection of the primary sealing area.

SHORT DESCRIPTION

38x52x7 NBR AO/TC is a double-lip rotary shaft seal / oil seal with a 38 mm nominal shaft diameter, 52 mm outside diameter and 7 mm width. The seal is manufactured from NBR. Its AO/TC construction combines a spring-loaded primary sealing lip with an additional dust lip. When selecting an equivalent, verify the complete 38x52x7 mm + NBR + AO/TC configuration, operating medium and installation conditions rather than dimensions alone.