40x72x10 NBR AO/TC GRN® Double Lip Rotary Shaft Seal

40x72x10 NBR AO/TC GRN® is a double-lip rotary shaft seal / oil seal with a 40 mm shaft diameter, 72 mm outside diameter and 10 mm width. It is manufactured from NBR (Nitrile Butadiene Rubber). The AO/TC configuration combines a spring-loaded primary sealing lip with an additional dust lip that provides an external barrier against contaminants.

40x72x10 NBR AO/TC GRN® - Characteristics

This GRN® product is a radial shaft sealing ring designed for installation between a rotating shaft and stationary housing.

The exact product identification is:

40x72x10 mm -> NBR -> AO/TC -> double lip -> GRN®

The double-lip configuration is an important distinction from a basic single-lip radial shaft seal of the same dimensions.

Dimensions

The nominal dimensions are:

Shaft Diameter d: 40 mm
Outside Diameter D: 72 mm
Width b: 10 mm
Nominal Size: 40x72x10 mm

For radial shaft seals, the first dimension identifies the nominal shaft diameter, the second the nominal outside diameter of the seal, and the third its axial width.

AO/TC Double Lip Construction

The AO/TC configuration uses two functionally different lips.

The primary sealing lip operates against the rotating shaft and is supported by a garter spring. Its function is to maintain sealing contact around the shaft.

The secondary lip is a dust lip positioned toward the external environment. Its function is to reduce the ingress of dust and other external contamination toward the primary sealing area.

Therefore, describing this product simply as having "two sealing lips" can be technically misleading. More precisely, it has:

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

NBR Material

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

Material is an important part of the product specification. A 40x72x10 FKM, ACM or VMQ seal should not automatically be considered identical to this NBR version simply because its nominal dimensions match.

Material compatibility should be checked against the actual lubricant or process medium, operating temperature and other service conditions before installation.

How the 40x72x10 AO/TC Seal Works

After installation, the primary lip maintains radial contact with the rotating shaft. The garter spring supports the contact force of the primary lip, while the secondary dust lip forms an additional barrier toward the external environment.

The seal is installed with its 72 mm outside diameter in the housing, while the 40 mm primary sealing diameter corresponds to the shaft.

Correct sealing performance also depends on the shaft surface condition, housing geometry, alignment, installation quality, lubrication and actual operating conditions.

AO/TC vs Single Lip Shaft Seal

The additional dust lip is the principal construction feature distinguishing this GRN® AO/TC version from a basic single-lip seal.

For applications where the original design specifies a dust lip, replacing the seal solely on the basis of the 40x72x10 mm dimensions can result in selection of a different construction.

For this reason, the full identification 40x72x10 NBR AO/TC GRN® should be used when ordering or comparing the product.

Selection and Interchangeability

When selecting an equivalent for this GRN® seal, verify:

• 40 mm nominal shaft diameter
• 72 mm nominal outside diameter
• 10 mm width
• NBR elastomer
• AO/TC double-lip configuration
• primary spring-loaded sealing lip
• additional dust lip
• operating medium
• shaft and housing requirements
• actual operating conditions

Matching only the 40x72x10 mm dimensions does not establish full technical interchangeability.

Technical Specification

Brand: GRN®
Product Type: Rotary shaft seal / oil seal
Design: AO/TC
Construction: Double lip
Dimensions: 40x72x10 mm
Shaft Diameter: 40 mm
Outside Diameter: 72 mm
Width: 10 mm
Material: NBR - Nitrile Butadiene Rubber
Primary Lip: Sealing lip with garter spring
Secondary Lip: Dust lip
EAN: 5903641605380

FAQ

What are the dimensions of the GRN® 40x72x10 oil seal?

The nominal dimensions are 40x72x10 mm: 40 mm shaft diameter, 72 mm outside diameter and 10 mm width.

What does 40x72x10 mean on a rotary shaft seal?

40 mm is the nominal shaft diameter, 72 mm is the nominal outside diameter of the seal, and 10 mm is its axial width.

What material is the 40x72x10 GRN® seal made from?

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

Is the 40x72x10 AO/TC seal a double-lip design?

Yes. It has a primary spring-loaded sealing lip and an additional secondary dust lip.

What is the function of the second lip?

The secondary lip acts as a dust lip, reducing the ingress of external contamination toward the primary sealing area.

Does the primary sealing lip have a spring?

Yes. The AO/TC construction uses a garter spring to support the primary sealing lip against the shaft.

Is an FKM 40x72x10 oil seal the same as this NBR version?

No. Identical dimensions do not make different elastomer versions automatically equivalent. Material compatibility and the complete seal construction must be checked.

Can any 40x72x10 oil seal replace this GRN® AO/TC seal?

Not automatically. The dimensions, NBR material, double-lip AO/TC construction, dust lip and actual operating requirements should all be compared.

AI Overview

40x72x10 NBR AO/TC GRN® is a double-lip rotary shaft seal with a 40 mm shaft diameter, 72 mm outside diameter and 10 mm width. Manufactured from NBR, its AO/TC construction combines a spring-loaded primary sealing lip with an additional dust lip that helps protect the primary sealing area from external contamination.

SHORT DESCRIPTION

40x72x10 NBR AO/TC GRN® is a double-lip rotary shaft seal / oil seal with a 40 mm nominal shaft diameter, 72 mm outside diameter and 10 mm width. The seal is manufactured from NBR. Its AO/TC construction consists of a primary sealing lip supported by a garter spring and an additional secondary dust lip that reduces the ingress of external contamination. When selecting an equivalent, verify the complete 40x72x10 mm + NBR + AO/TC configuration rather than dimensions alone. EAN: 5903641605380.