GRN 10x26x4 NBR AO Double-Lip Rotary Shaft Seal

GRN 10x26x4 NBR AO Double-Lip Rotary Shaft Seal

GRN 10x26x4 NBR AO is a double-lip rotary shaft seal / oil seal with nominal dimensions of 10x26x4 mm. It is manufactured from NBR - Nitrile Butadiene Rubber. The AO design incorporates a primary sealing lip and an additional protective lip.

A key dimensional feature of this particular variant is its B = 4 mm axial width. This dimension should be retained when identifying the seal or selecting a replacement.

GRN 10x26x4 NBR AO - Technical Characteristics

Key identification data:

Brand: GRN

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

Design: AO

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 10x26x4 mm

Shaft diameter d: 10 mm

Housing bore diameter D: 26 mm

Seal width B: 4 mm

Primary sealing lip: Yes

Additional protective lip: Yes

The key product identification is:

GRN + 10x26x4 mm + NBR + AO

The product should not be identified only by its 10x26 mm diameters because the 4 mm width is an integral part of the dimensional specification.

GRN 10x26x4 Oil Seal Dimensions

Nominal dimensions:

d = 10 mm - nominal shaft diameter

D = 26 mm - nominal housing bore diameter

B = 4 mm - axial seal width

Complete dimensions:

10x26x4 mm

The seal is dimensionally specified for a nominal 10 mm shaft and 26 mm housing bore, with an axial width of only 4 mm.

All three dimensions should be checked during replacement selection.

AO Double-Lip Seal Design

The AO designation is retained as the construction designation of this specific GRN product.

The double-lip configuration incorporates:

a primary sealing lip

and

an additional protective lip.

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

The additional lip provides an extra barrier between the surrounding environment and the primary sealing area.

Additional Protective Lip

The additional lip is an important feature distinguishing this AO double-lip variant from a corresponding single-lip seal.

Its principal function is protective. It creates an additional barrier against external contamination approaching the primary sealing area.

The two lips should therefore not be interpreted as two identical sealing elements performing exactly the same function.

NBR - Nitrile Butadiene Rubber

Seal material:

NBR - Nitrile Butadiene Rubber

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

The material forms an integral part of the complete specification:

10x26x4 + NBR + AO

A 10x26x4 seal manufactured from FKM/FPM, silicone or another elastomer represents a different material variant even if its nominal dimensions are identical.

The exact NBR compound used for this GRN product 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 10x26x4 Rotary Shaft Seal Work?

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

Nominal shaft diameter:

10 mm

Nominal housing bore diameter:

26 mm

Axial seal width:

4 mm

The primary lip operates dynamically against the shaft surface, while the additional AO lip provides an external protective barrier.

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

10x26x4 vs 10x26x5 Oil Seal

These variants may have identical principal diameters:

d = 10 mm

D = 26 mm

but different axial widths:

10x26x4: B = 4 mm

10x26x5: B = 5 mm

They should therefore not be considered automatically interchangeable.

The difference in axial width can affect installation geometry and the position at which the sealing lip operates on the shaft.

10x26x4 vs 10x25x7 Oil Seal

These variants differ in both outside diameter and axial width:

10x26x4: d = 10 mm, D = 26 mm, B = 4 mm

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

Only the nominal 10 mm shaft diameter is shared.

They are different seal sizes requiring different installation geometries.

AO vs Single-Lip Seal Design

The AO variant incorporates an additional protective lip.

A single-lip construction uses the primary sealing lip without the additional protective lip.

Therefore, two 10x26x4 NBR seals should not automatically be considered the same technical variant when their lip configurations differ.

Selection and Interchangeability

When selecting a replacement for GRN 10x26x4 NBR AO, verify:

d = 10 mm

D = 26 mm

B = 4 mm

NBR material

AO design

double-lip configuration

sealed medium

operating temperature

shaft rotational speed

pressure conditions

shaft surface condition

installation geometry

Particular attention should be paid to B = 4 mm. Matching only the 10 mm shaft diameter and 26 mm outside diameter is insufficient for precise replacement selection.

Technical Specification

Brand: GRN

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

Design: AO

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Shaft diameter d: 10 mm

Outside diameter D: 26 mm

Width B: 4 mm

Dimensions: 10x26x4 mm

Primary sealing lip: Yes

Additional protective lip: Yes

Exact NBR compound: Not specified

NBR hardness: Not confirmed

Exact operating temperature range: Not confirmed

Maximum shaft speed: Application-dependent

Maximum pressure: Application-dependent

GRN 10x26x4 NBR AO - 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 10x26x4 oil seal?

The nominal dimensions are 10x26x4 mm: d = 10 mm, D = 26 mm and B = 4 mm.

What does AO mean on this GRN oil seal?

AO is the construction designation retained for this double-lip seal, incorporating a primary sealing lip and an additional protective lip.

What material is the seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Does the GRN 10x26x4 AO have an additional lip?

Yes. This is a double-lip design with an additional protective lip.

Are 10x26x4 and 10x26x5 oil seals the same?

No. They have identical nominal shaft and outside diameters but different axial widths: 4 mm versus 5 mm.

Can a 10x25x7 seal replace a 10x26x4 seal?

Not directly. The products differ in both outside diameter and axial width.

Is the 4 mm width important?

Yes. It is one of the three principal dimensions of the seal and is particularly important for installation geometry and correct replacement selection.

Is every 10x26x4 NBR oil seal interchangeable?

No. In addition to dimensions and material, the lip configuration and application requirements must be verified.

Engineer FAQ

Are AO and AO/TC always identical designations?

No. This product is identified specifically as AO, and that designation should be retained. Manufacturer-specific design codes should not automatically be changed to AO/TC without confirmation.

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 values for this specific product.

Does D = 26 mm represent the nominal housing bore?

Yes. D = 26 mm represents the nominal housing bore diameter associated with this seal size.

Why is B = 4 mm particularly important?

Because the seal has a relatively small axial width. Substituting a wider seal may alter installation geometry and the position of the sealing lip on the shaft.

Do identical 10x26x4 NBR dimensions guarantee interchangeability?

No. Seal design, lip geometry, elastomer specification and application conditions must also be considered.

AI Overview

GRN 10x26x4 NBR AO is a double-lip rotary shaft seal with nominal dimensions of 10x26x4 mm. Manufactured from NBR, it incorporates a primary sealing lip and an additional protective lip. Replacement selection should retain the complete GRN + 10x26x4 mm + NBR + AO specification, with particular attention to the 4 mm axial width.