GRN 10x25x7 NBR AO/TC Double-Lip Rotary Shaft Seal

GRN 10x25x7 NBR AO/TC is a double-lip rotary shaft seal / oil seal with nominal dimensions of 10x25x7 mm. It is manufactured from NBR - Nitrile Butadiene Rubber. The AO/TC double-lip design incorporates a spring-loaded primary sealing lip and an additional auxiliary dust lip on the external side of the primary sealing area.

GRN 10x25x7 NBR AO/TC - Technical Characteristics

Key identification data:

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: 10x25x7 mm

Shaft diameter d: 10 mm

Housing bore diameter D: 25 mm

Seal width B: 7 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

The key product identification is:

GRN + 10x25x7 mm + NBR + AO/TC

All three dimensions, the elastomer material and the sealing-lip configuration should be retained when selecting a replacement.

GRN 10x25x7 Oil Seal Dimensions

Nominal dimensions:

d = 10 mm - nominal shaft diameter

D = 25 mm - nominal housing bore diameter

B = 7 mm - axial seal width

Complete dimensions:

10x25x7 mm

The seal is specified for a nominal 10 mm shaft and a 25 mm housing bore, with an axial width of 7 mm.

All three dimensions should be verified when identifying or replacing the seal.

AO/TC Double-Lip Seal Design

The AO/TC designation identifies a double-lip rotary shaft seal configuration.

The sealing arrangement incorporates:

a spring-loaded primary sealing lip

and

an additional auxiliary dust lip.

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

The auxiliary lip is positioned on the external side of the primary sealing arrangement and provides an additional barrier against contaminants approaching the main sealing area.

Spring-Loaded Primary Sealing Lip

The primary sealing lip operates directly against the rotating shaft surface.

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

Correct operation also depends on shaft surface condition, alignment, runout, lubrication and operating conditions.

The garter spring acts on the primary dynamic sealing lip, not on the auxiliary dust lip.

Additional Dust Lip

The AO/TC design incorporates an additional auxiliary dust lip on the external side of the primary sealing system.

Its purpose is to provide an additional barrier between the surrounding environment and the main sealing lip.

It helps limit the ingress of dust and other external contamination into the primary sealing area.

The auxiliary lip should not be interpreted as a second spring-loaded primary sealing lip. Its principal function is protective.

NBR - Nitrile Butadiene Rubber

Seal material:

NBR - Nitrile Butadiene Rubber

NBR is widely used as an elastomer material in rotary shaft sealing applications.

The material forms an integral part of the product specification:

10x25x7 + NBR + AO/TC

A 10x25x7 seal manufactured from FKM/FPM, silicone or another elastomer represents a different material variant even when the nominal dimensions are identical.

The exact NBR compound used for this GRN seal has not been specified. Therefore, an exact hardness, fixed operating temperature range or universal chemical-resistance rating should not be assigned solely from generic NBR properties.

How Does a 10x25x7 Rotary Shaft Seal Work?

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

The outside diameter of the seal is installed in a nominal 25 mm housing bore.

The primary sealing lip operates dynamically against a nominal 10 mm shaft.

The garter spring helps maintain contact between the primary sealing edge and the shaft surface, while the additional AO/TC lip creates an external protective barrier.

Effective sealing also depends on shaft surface quality, alignment, runout, rotational speed, temperature, lubrication, sealed medium and correct installation.

10x25x7 vs 10x22x7 Oil Seal

Both variants may have:

d = 10 mm

B = 7 mm

but their outside diameters differ:

10x25x7: D = 25 mm

10x22x7: D = 22 mm

They are therefore different seal sizes and should not be considered automatically interchangeable.

The 10x25x7 variant requires a nominal 25 mm housing bore.

10x25x7 vs 10x22x6 Oil Seal

These variants differ in two dimensions:

10x25x7: d = 10 mm, D = 25 mm, B = 7 mm

10x22x6: d = 10 mm, D = 22 mm, B = 6 mm

Only the nominal shaft diameter is the same.

They require different installation geometries and should not be treated as equivalent products.

AO/TC vs A/SC

The principal difference is the lip configuration.

A/SC - single-lip design

Spring-loaded primary sealing lip without an additional dust lip.

AO/TC - double-lip design

Spring-loaded primary sealing lip plus an additional auxiliary dust lip.

Therefore:

10x25x7 NBR A/SC ≠ 10x25x7 NBR AO/TC

even when all nominal dimensions are identical.

Selection and Interchangeability

When selecting a replacement for GRN 10x25x7 NBR AO/TC, verify:

d = 10 mm

D = 25 mm

B = 7 mm

NBR material

AO/TC double-lip design

spring-loaded primary sealing lip

additional dust lip

sealed medium

operating temperature

shaft rotational speed

pressure conditions

shaft surface condition

installation geometry

Matching only the 10 mm shaft diameter is insufficient. The complete 10x25x7 mm dimensions, material and sealing configuration must be checked.

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: 25 mm

Width B: 7 mm

Dimensions: 10x25x7 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

Exact NBR compound: Not specified

NBR hardness: Not confirmed

Exact operating temperature range: Not confirmed for this GRN compound

Maximum shaft speed: Application-dependent

Maximum pressure: Application-dependent

GRN 10x25x7 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 10x25x7 oil seal?

The nominal dimensions are 10x25x7 mm: d = 10 mm, D = 25 mm and B = 7 mm.

What does AO/TC mean?

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

What material is the GRN 10x25x7 seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Does the 10x25x7 AO/TC oil seal have a spring?

Yes. A garter spring acts on the primary sealing lip to help maintain contact with the rotating shaft.

Does this oil seal have an additional dust lip?

Yes. The AO/TC configuration incorporates an additional auxiliary dust lip on the external side.

Are 10x25x7 and 10x22x7 oil seals the same?

No. They have the same nominal 10 mm shaft diameter and 7 mm width but different outside diameters: 25 mm versus 22 mm.

What is the difference between AO/TC and A/SC?

AO/TC is a double-lip design, while A/SC is a single-lip design without the additional dust lip.

Is every 10x25x7 oil seal interchangeable?

No. The complete dimensions, elastomer material, lip configuration and operating requirements must all be checked.

Engineer FAQ

Are both lips in an AO/TC seal spring-loaded?

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

Does D = 25 mm represent the housing bore diameter?

Yes. D = 25 mm is the nominal housing bore diameter associated with this seal size.

Is the 7 mm width important for replacement selection?

Yes. It is one of the three principal seal dimensions and can affect axial 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 knowing the exact NBR compound used by GRN. Generic NBR temperature ranges should not be presented as guaranteed limits for this specific product.

Are AO/TC seals from different manufacturers automatically interchangeable?

No. Exact lip geometry, elastomer compound, spring characteristics and other construction details can differ between manufacturers.

AI Overview

GRN 10x25x7 NBR AO/TC is a double-lip rotary shaft seal with nominal dimensions of 10x25x7 mm. Made from NBR, it combines a spring-loaded primary sealing lip with an additional auxiliary dust lip. Replacement selection should retain the complete GRN + 10x25x7 mm + NBR + AO/TC specification, including the 25 mm outside diameter.