GRN® 10x28x7 NBR AO/TC Double-Lip Rotary Shaft Seal

GRN® 10x28x7 NBR AO/TC Double-Lip Rotary Shaft Seal

GRN® 10x28x7 NBR AO/TC is a double-lip rotary shaft seal / radial shaft seal / oil seal with nominal dimensions of 10x28x7 mm. It is manufactured from NBR - Nitrile Butadiene Rubber. The AO/TC design combines a spring-loaded primary dynamic sealing lip with an additional auxiliary dust lip.

The key technical identification is:

GRN® + 10x28x7 mm + NBR + AO/TC

GRN® 10x28x7 NBR AO/TC - Technical Characteristics

Brand: GRN®

Product type: Rotary Shaft Seal / Radial Shaft Seal / Oil Seal

Design: AO/TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 10x28x7 mm

Shaft diameter d: 10 mm

Outside diameter D: 28 mm

Seal width B: 7 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

Dimensions, elastomer material and sealing-lip configuration should be considered together when identifying the exact seal.

GRN® 10x28x7 Oil Seal Dimensions

Nominal dimensions:

d = 10 mm - nominal shaft diameter

D = 28 mm - nominal outside diameter / housing bore diameter

B = 7 mm - axial seal width

Complete dimensions:

10x28x7 mm

The seal is dimensionally specified for a nominal 10 mm shaft and 28 mm housing bore, with an axial width of 7 mm.

All three dimensions should be retained when selecting a replacement.

AO/TC Double-Lip Seal Design

The AO/TC configuration incorporates:

a primary dynamic sealing lip

a garter spring acting on the primary sealing lip

an additional auxiliary dust lip

The primary lip operates dynamically against the rotating shaft surface and performs the principal sealing function.

The auxiliary lip provides an additional external barrier against dust and contamination approaching the primary sealing area.

Spring-Loaded Primary Sealing Lip

The primary sealing lip operates against the nominal:

d = 10 mm shaft

A circumferential garter spring helps maintain radial contact between the primary sealing edge and the rotating shaft surface.

The spring acts on the primary dynamic sealing lip. The auxiliary dust lip should not be interpreted as a second identical spring-loaded sealing lip.

Actual sealing performance also depends on shaft surface quality, alignment, runout, lubrication and operating conditions.

Additional Auxiliary Dust Lip

The AO/TC construction incorporates an additional auxiliary dust lip.

Its function is to provide an additional barrier between the external environment and the primary sealing area.

This additional lip is one of the principal construction differences between the AO/TC double-lip design and the corresponding A/SC single-lip design.

NBR - Nitrile Butadiene Rubber

The sealing material is:

NBR - Nitrile Butadiene Rubber

Material is an integral part of the exact product specification:

10x28x7 + NBR + AO/TC

A 10x28x7 seal manufactured from FKM/FPM, silicone or another elastomer represents a different material variant even when its nominal dimensions are identical.

The exact NBR compound used for this GRN® product has not been confirmed. Therefore, a specific hardness, exact operating temperature range, maximum pressure or maximum shaft speed should not be assigned solely from generic NBR properties.

How Does the GRN® 10x28x7 Rotary Shaft Seal Work?

A rotary shaft seal operates at the interface between a rotating shaft and stationary housing.

For this size:

Nominal shaft diameter: 10 mm

Nominal housing bore diameter: 28 mm

Seal width: 7 mm

The spring-loaded primary lip operates dynamically against the shaft surface, while the additional AO/TC lip provides an external protective barrier.

Actual performance depends on the specific application, including shaft surface condition, runout, alignment, rotational speed, temperature, sealed medium and lubrication conditions.

GRN® 10x28x7 AO/TC vs A/SC

Seals with identical nominal dimensions may have different sealing-lip configurations.

AO/TC - double lip:

Spring-loaded primary sealing lip
Additional auxiliary dust lip

A/SC - single lip:

Spring-loaded primary sealing lip
No additional dust lip

Therefore:

10x28x7 NBR AO/TC ≠ 10x28x7 NBR A/SC

in terms of sealing-lip construction.

Identical dimensions and NBR material alone do not establish complete technical interchangeability.

GRN® 10x28x7 vs 10x30x7

Both sizes have:

d = 10 mm

B = 7 mm

but different outside diameters:

10x28x7: D = 28 mm

10x30x7: D = 30 mm

The outside diameter differs by 2 mm, so these seals are intended for different nominal housing bore diameters and are not dimensionally interchangeable.

GRN® 10x28x7 vs 10x26x7

Both have:

d = 10 mm

B = 7 mm

but:

10x28x7: D = 28 mm

10x26x7: D = 26 mm

The outside diameter differs by 2 mm. These are different seal sizes and should not be treated as interchangeable.

GRN® 10x28x7 vs 10x25x7

Common dimensions:

d = 10 mm

B = 7 mm

Difference:

10x28x7: D = 28 mm

10x25x7: D = 25 mm

The outside diameter differs by 3 mm, so these are different dimensional variants.

Selection and Interchangeability

When selecting a replacement for GRN® 10x28x7 NBR AO/TC, verify:

d = 10 mm

D = 28 mm

B = 7 mm

NBR material

AO/TC design

double-lip configuration

spring-loaded primary sealing lip

additional dust lip

sealed medium

operating temperature

shaft rotational speed

pressure conditions

shaft surface condition

installation geometry

Nominal dimensions alone do not prove complete interchangeability if the elastomer material or sealing-lip construction differs.

Technical Specification

Brand: GRN®

Product: Rotary Shaft Seal / Radial Shaft Seal / Oil Seal

Design: AO/TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Shaft diameter d: 10 mm

Outside diameter D: 28 mm

Width B: 7 mm

Dimensions: 10x28x7 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

Exact NBR compound: Not confirmed

Hardness: Not confirmed

Exact operating temperature range: Not confirmed

Maximum shaft speed: Application-dependent

Maximum pressure: Application-dependent

GRN® 10x28x7 NBR AO/TC - Stock in Poland

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4.

24h Shipping. Available from stock in Poland for delivery across the EU.

FAQ

What are the dimensions of the GRN® 10x28x7 oil seal?

The nominal dimensions are 10x28x7 mm: d = 10 mm, D = 28 mm and B = 7 mm.

What does AO/TC mean?

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

What material is GRN® 10x28x7 made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Does GRN® 10x28x7 AO/TC have a dust lip?

Yes. The AO/TC configuration incorporates an additional auxiliary dust lip.

Are both sealing lips spring-loaded?

No. The garter spring acts on the primary dynamic sealing lip. The additional lip primarily performs a protective function.

Are 10x28x7 AO/TC and 10x28x7 A/SC the same?

No. They can have identical dimensions and material but differ in their sealing-lip configuration.

Can a 10x30x7 oil seal replace a 10x28x7 seal?

No. Their outside diameters differ: 30 mm versus 28 mm.

Is every 10x28x7 NBR oil seal interchangeable?

No. Dimensions, elastomer material, lip configuration and application requirements should all be verified.

Engineer FAQ

Does D = 28 mm represent the nominal housing bore diameter?

Yes. The 28 mm outside diameter corresponds to the nominal housing bore dimension associated with this seal size.

Is B = 7 mm important when selecting a replacement?

Yes. Axial width is one of the three principal seal dimensions and can affect installation geometry and the position of the sealing lip on the shaft.

Can an exact operating temperature be specified for this NBR seal?

Not without confirmation of the exact NBR compound used by GRN®. Generic NBR temperature limits should not be presented as guaranteed specifications for this specific product.

Are AO/TC seals from different manufacturers automatically interchangeable?

No. Lip geometry, elastomer compound and other construction details may differ between manufacturers.

What is the safest identification for replacement selection?

Retain the complete combination:

GRN® + 10x28x7 mm + NBR + AO/TC

and then verify the requirements of the specific application.

AI Overview

GRN® 10x28x7 NBR AO/TC is a double-lip rotary shaft seal with nominal dimensions of 10x28x7 mm. Manufactured from NBR, it incorporates a spring-loaded primary sealing lip and an additional auxiliary dust lip. Replacement selection should retain the complete GRN® + 10x28x7 mm + NBR + AO/TC specification and distinguish it from A/SC variants.