GRN® 120x140x12 NBR AO/TC Double Lip Rotary Shaft Seal

GRN® 120x140x12 NBR AO/TC Double Lip Rotary Shaft Seal

GRN® 120x140x12 NBR AO/TC is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of 120x140x12 mm. It is manufactured from NBR - Nitrile Butadiene Rubber and uses the AO/TC double lip configuration. The primary dynamic sealing lip is spring-loaded, while the additional auxiliary lip provides a protective barrier on the external side of the primary sealing zone.

A key identification feature of this exact variant is its B = 12 mm axial width. This distinguishes it from the closely related 120x140x13 seal, which has the same nominal shaft and outside diameters but a 13 mm width.

Complete product identification:

GRN® + 120x140x12 mm + NBR + AO/TC

GRN® 120x140x12 NBR AO/TC - Technical Characteristics

The principal identification parameters are:

Brand: GRN®

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

Design: AO/TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 120x140x12 mm

Shaft diameter d: 120 mm

Outside diameter D: 140 mm

Width B: 12 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

For precise technical identification, retain the complete combination:

120x140x12 mm + NBR + AO/TC + GRN®

GRN® 120x140x12 Dimensions

The nominal installation dimensions are:

d = 120 mm - nominal shaft diameter

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

B = 12 mm - nominal axial seal width

Complete size:

120x140x12 mm

The 120 mm dimension corresponds to the nominal shaft diameter on which the primary dynamic sealing lip 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 nominal axial width of this exact variant.

All three dimensions should be retained during identification and replacement selection. The designation should not be shortened to 120x140, because seals with the same shaft and outside diameters may have different widths.

AO/TC Double Lip Seal Design

The AO/TC designation identifies a double lip sealing configuration.

The construction comprises:

Primary sealing lip - operates dynamically against the rotating shaft.

Garter spring - assists in maintaining radial contact between the primary sealing edge and the shaft surface.

Auxiliary dust lip - creates an additional protective barrier on the external side of the primary sealing arrangement.

The spring-loaded primary lip performs the principal dynamic sealing function.

The auxiliary lip has a separate protective role and helps limit external contamination from reaching the primary sealing zone.

The AO/TC profile should not automatically be considered technically identical to every other double lip shaft seal profile used by other manufacturers.

How GRN® 120x140x12 AO/TC Works

GRN® 120x140x12 NBR AO/TC is a radial shaft sealing element designed to create a dynamic sealing interface between a rotating shaft and a stationary housing.

The nominal shaft diameter is:

d = 120 mm

The nominal seal outside diameter is:

D = 140 mm

The nominal axial width is:

B = 12 mm

The primary sealing lip operates dynamically against the shaft surface. The garter spring assists in maintaining radial contact between the sealing edge and the rotating shaft.

The additional auxiliary dust lip provides an extra barrier on the external side of the primary sealing arrangement.

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 shaft 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® 120x140x12 NBR AO/TC, 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 shaft seals from other manufacturers should not be treated as confirmed technical specifications for this exact GRN® variant.

Meaning of 120x140x12 NBR AO/TC

The designation can be interpreted as follows:

120 - nominal shaft diameter in mm

140 - nominal outside diameter in mm

12 - nominal axial width in mm

NBR - Nitrile Butadiene Rubber

AO/TC - double lip sealing configuration

GRN® - product brand

Complete identification:

GRN® + 120x140x12 + NBR + AO/TC

For this product, the third dimension is particularly important:

B = 12 mm

It distinguishes this exact variant from the 120x140x13 shaft seal.

GRN® 120x140x12 vs 120x140x13

The 120x140x12 and 120x140x13 variants have identical nominal diameters:

d = 120 mm

D = 140 mm

Their axial widths differ:

GRN® 120x140x12 - B = 12 mm

GRN® 120x140x13 - B = 13 mm

The dimensional difference is:

1 mm in axial width

They are therefore two separate dimensional variants.

A 120x140x13 seal should not automatically be used as a replacement for a 120x140x12 seal, or vice versa. The required axial width and actual installation geometry should be checked before substitution.

Keeping separate product pages for these variants also provides more precise search intent matching: a search for 120x140x12 should lead to the exact 12 mm variant rather than the 13 mm product.

GRN® 120x140x12 vs 120x150x12

These two variants share:

d = 120 mm

B = 12 mm

However, their outside diameters differ:

120x140x12 - D = 140 mm

120x150x12 - D = 150 mm

The difference is:

10 mm in nominal outside diameter

They are therefore different dimensional shaft seals and should not be treated as direct substitutes.

This distinction is important because matching the shaft diameter and width alone is not sufficient for correct product identification.

Selection and Interchangeability

When selecting a replacement for GRN® 120x140x12 NBR AO/TC, verify at least:

• d = 120 mm
• D = 140 mm
• B = 12 mm
• NBR material
• AO/TC double lip configuration
• spring-loaded primary sealing lip
• additional auxiliary dust lip

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

Identical 120x140x12 mm dimensions do not automatically establish full technical interchangeability.

A shaft 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® 120x140x12 NBR AO/TC?

The nominal dimensions are 120x140x12 mm: shaft diameter d = 120 mm, outside diameter D = 140 mm and axial width B = 12 mm.

What type of seal is GRN® 120x140x12 AO/TC?

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

What does AO/TC mean?

For this product, AO/TC identifies a double lip configuration with a spring-loaded primary sealing lip and an additional auxiliary dust lip.

What material is GRN® 120x140x12 made from?

The specified sealing material is NBR - Nitrile Butadiene Rubber. The exact compound formulation and hardness should not be assumed without product-specific manufacturer documentation.

Does GRN® 120x140x12 AO/TC have a spring?

Yes. The primary dynamic sealing lip is spring-loaded. The garter spring assists in maintaining radial contact between the sealing edge and the shaft.

What is the difference between 120x140x12 and 120x140x13?

Both variants have d = 120 mm and D = 140 mm, but their axial widths differ. The 120x140x12 variant has B = 12 mm, while the 120x140x13 variant has B = 13 mm.

Can a 120x140x13 seal replace a 120x140x12 seal?

Direct interchangeability should not be assumed. The axial width differs by 1 mm, so the installation geometry and complete technical specification should be checked before substitution.

Is another 120x140x12 oil seal automatically interchangeable with GRN® AO/TC?

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

AI Overview

GRN® 120x140x12 NBR AO/TC is a double lip radial shaft seal with nominal dimensions of d = 120 mm, D = 140 mm and B = 12 mm. It is manufactured from NBR - Nitrile Butadiene Rubber. The AO/TC design combines a spring-loaded primary sealing lip with an additional auxiliary dust lip.