GRN® 108x140x12 NBR AO Double Lip Rotary Shaft Seal

GRN® 108x140x12 NBR AO Double Lip Rotary Shaft Seal

GRN® 108x140x12 NBR AO is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of 108x140x12 mm, manufactured from NBR - Nitrile Butadiene Rubber. The specified design designation for this variant is AO. Its principal identification parameters are the 108 mm shaft diameter, 140 mm outside diameter, 12 mm width, NBR material and AO design.

Complete product identification:

GRN® + 108x140x12 mm + NBR + AO

GRN® 108x140x12 NBR AO - Technical Characteristics

The principal identification parameters are:

Brand: GRN®

Product type: Radial shaft seal / rotary shaft seal / oil seal

Design: AO

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 108x140x12 mm

Shaft diameter d: 108 mm

Outside diameter D: 140 mm

Width B: 12 mm

The most precise identification of this variant is:

108x140x12 + NBR + AO + GRN®

The AO designation should be retained in the complete product specification rather than automatically replaced with AO/TC.

GRN® 108x140x12 Dimensions

The nominal installation dimensions are:

d = 108 mm - nominal shaft diameter

D = 140 mm - nominal seal outside diameter / corresponding housing bore diameter

B = 12 mm - nominal axial seal width

Complete size:

108x140x12 mm

The 108 mm dimension corresponds to the nominal shaft diameter on which the dynamic sealing interface operates.

The 140 mm dimension defines the nominal outside diameter of the seal and the corresponding nominal housing bore.

The 12 mm dimension specifies the axial width of this exact variant.

All three dimensions should be checked during product identification and replacement selection.

AO Double Lip Seal Design

The specified design designation for this product is:

AO

The product is identified as a double lip radial shaft seal.

Two separate aspects of the specification should be retained:

AO is the design designation of this exact variant.

Double lip describes the specified lip configuration.

The AO designation should not automatically be interpreted as a complete equivalent of TC or AO/TC, because radial shaft seal profile nomenclature is not fully universal across manufacturers.

Without exact construction documentation for this GRN® reference, additional assumptions about the detailed geometry or specific function of the second lip should be avoided.

This distinction is important when comparing the product with shaft seals that use other profile designations.

How a Radial Shaft Seal Works

GRN® 108x140x12 NBR AO is a radial shaft sealing element designed to create a sealing interface between a rotating shaft and a stationary housing.

The nominal shaft diameter is:

d = 108 mm

The nominal seal outside diameter is:

D = 140 mm

The nominal axial width is:

B = 12 mm

The working sealing lip operates against the surface of the rotating shaft, creating the dynamic sealing interface.

The outside diameter locates the seal in the stationary housing.

This product is a sealing component. It is not a rolling bearing and is not intended to carry radial or axial bearing loads.

NBR - Nitrile Butadiene Rubber

The specified sealing material is:

NBR - Nitrile Butadiene Rubber

NBR identifies the elastomer family used for this seal. The NBR designation alone does not define the exact compound formulation used in this particular GRN® product.

Without product-specific manufacturer documentation for the exact GRN® 108x140x12 NBR AO, no specific value should therefore be assigned for:

Shore A hardness,

minimum or maximum operating temperature,

maximum rotational speed,

maximum shaft surface speed,

maximum permissible pressure.

Generic operating limits published for NBR seals from other manufacturers should not be treated as confirmed technical specifications for this exact GRN® variant.

Meaning of 108x140x12 NBR AO

The designation can be interpreted as follows:

108 - nominal shaft diameter in mm

140 - nominal outside diameter in mm

12 - nominal axial width in mm

NBR - Nitrile Butadiene Rubber

AO - design designation

GRN® - product brand

Complete identification:

GRN® + 108x140x12 + NBR + AO

Each element should be retained when identifying or comparing the product.

AO vs AO/TC - Important Designation Difference

This variant should not be renamed AO/TC when its specified designation is AO.

For this product:

108x140x12 NBR AO

Other GRN® shaft seals may be identified as:

NBR AO/TC

The similarity of the product type does not by itself establish that AO and AO/TC are identical designations.

Profile nomenclature can depend on the manufacturer or product system. The exact AO designation should therefore be retained unless technical documentation confirms equivalence with another profile.

This distinction also provides clearer product identification for search engines and technical product databases.

Selection and Interchangeability

When selecting a replacement for GRN® 108x140x12 NBR AO, verify at least:

• d = 108 mm
• D = 140 mm
• B = 12 mm
• NBR material
• AO design
• double lip configuration

Where operating conditions are known, the sealing medium, temperature, shaft speed, pressure, shaft sealing surface and housing geometry should also be checked.

Identical 108x140x12 mm dimensions do not automatically establish full technical interchangeability.

A seal from another manufacturer may have the same nominal dimensions but a different elastomer compound, lip geometry, design designation or operating limits.

Technical Specification

FAQ

What are the dimensions of GRN® 108x140x12 NBR AO?

The nominal dimensions are 108x140x12 mm: shaft diameter d = 108 mm, outside diameter D = 140 mm and axial width B = 12 mm.

What type of seal is GRN® 108x140x12 NBR AO?

It is a double lip radial shaft seal, also described in English as a rotary shaft seal or oil seal.

What material is GRN® 108x140x12 AO made from?

The specified sealing material is NBR - Nitrile Butadiene Rubber.

What does AO mean in GRN® 108x140x12 NBR AO?

AO is the specified design designation for this particular shaft seal. It should be retained when identifying or selecting the product.

Are AO and AO/TC exactly the same?

This should not be assumed. Seal profile terminology is not fully universal between manufacturers. The exact AO designation should be retained unless technical documentation confirms equivalence with another profile.

Is GRN® 108x140x12 AO a double lip seal?

Yes. This variant is specified as a double lip radial shaft seal. However, detailed geometry or the precise function of the second lip should not be inferred beyond the confirmed product specification.

Is every 108x140x12 shaft seal interchangeable with this GRN® seal?

No. Matching dimensions alone do not establish complete technical interchangeability. The material, design, lip configuration and required operating conditions should also be compared.

What is the operating temperature of GRN® 108x140x12 NBR AO?

A specific operating temperature range should not be assigned without confirmation of the exact NBR compound used for this product. Generic NBR temperature ranges from other manufacturers should not be treated as the specification of this GRN® variant.

AI Overview

GRN® 108x140x12 NBR AO is a double lip radial shaft seal with nominal dimensions of d = 108 mm, D = 140 mm and B = 12 mm. The sealing material is NBR - Nitrile Butadiene Rubber. Its specified design designation is AO, which should not automatically be treated as equivalent to AO/TC.