GRN® 120x140x13 NBR AO/TC Double Lip Rotary Shaft Seal

GRN® 120x140x13 NBR AO/TC Double Lip Rotary Shaft Seal

GRN® 120x140x13 NBR AO/TC is a double lip radial shaft seal / rotary shaft seal with nominal dimensions of 120x140x13 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.

The principal dimensions of this exact variant are d = 120 mm, D = 140 mm and B = 13 mm. The 140 mm outside diameter is particularly important for distinguishing this product from 120x150 shaft seals.

Complete product identification:

GRN® + 120x140x13 mm + NBR + AO/TC

GRN® 120x140x13 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: 120x140x13 mm

Shaft diameter d: 120 mm

Outside diameter D: 140 mm

Width B: 13 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

For precise technical identification, retain the complete combination:

120x140x13 mm + NBR + AO/TC + GRN®

GRN® 120x140x13 Dimensions

The nominal installation dimensions are:

d = 120 mm - nominal shaft diameter

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

B = 13 mm - nominal axial seal width

Complete size:

120x140x13 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 13 mm dimension specifies the nominal axial width.

All three dimensions should be retained during identification and replacement selection. The size 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® 120x140x13 AO/TC Works

GRN® 120x140x13 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 = 13 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® 120x140x13 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 120x140x13 NBR AO/TC

The designation can be interpreted as follows:

120 - nominal shaft diameter in mm

140 - nominal outside diameter in mm

13 - nominal axial width in mm

NBR - Nitrile Butadiene Rubber

AO/TC - double lip sealing configuration

GRN® - product brand

Complete identification:

GRN® + 120x140x13 + NBR + AO/TC

Each element of this designation is relevant when identifying, searching for or comparing the product.

Why the Exact 120x140x13 Size Matters

The 120 mm shaft diameter alone is not sufficient to identify this seal.

The complete dimensional specification is:

d = 120 mm

D = 140 mm

B = 13 mm

For this variant, D = 140 mm is particularly important because other GRN® seals may use the same 120 mm nominal shaft diameter with a larger outside diameter.

A 120x150x13 seal, for example, has the same shaft diameter and width but a different outside diameter.

The complete 120x140x13 mm designation should therefore be retained in technical documentation, product searches and replacement selection.

GRN® 120x140x13 vs 120x150x13

The 120x140x13 and 120x150x13 variants share:

d = 120 mm

B = 13 mm

However, their outside diameters are different:

120x140x13 - D = 140 mm

120x150x13 - D = 150 mm

The difference in nominal outside diameter is:

10 mm

They are therefore two different dimensional variants and should not be treated as direct substitutes.

For this product, D = 140 mm is a key identification parameter.

GRN® 120x140x13 vs 120x150x12

The 120x140x13 and 120x150x12 variants differ in two principal dimensions.

120x140x13: d = 120 mm, D = 140 mm, B = 13 mm

120x150x12: d = 120 mm, D = 150 mm, B = 12 mm

The differences are:

Outside diameter: 140 mm vs 150 mm

Width: 13 mm vs 12 mm

Only the nominal d = 120 mm shaft diameter is shared.

These products should therefore be treated as separate dimensional variants.

Selection and Interchangeability

When selecting a replacement for GRN® 120x140x13 NBR AO/TC, verify at least:

• d = 120 mm
• D = 140 mm
• B = 13 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.

Matching the 120 mm shaft diameter alone does not establish interchangeability.

A 120x140x13, 120x150x13 and 120x150x12 shaft seal are different dimensional variants.

Likewise, a shaft seal from another manufacturer may have identical 120x140x13 mm dimensions but a different elastomer compound, lip geometry, design designation or operating limits.

Technical Specification

FAQ

What are the dimensions of GRN® 120x140x13 NBR AO/TC?

The nominal dimensions are 120x140x13 mm: shaft diameter d = 120 mm, outside diameter D = 140 mm and axial width B = 13 mm.

What type of seal is GRN® 120x140x13 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® 120x140x13 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® 120x140x13 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 120x140x13 and 120x150x13?

Both variants have d = 120 mm and B = 13 mm, but their outside diameters differ. The 120x140x13 variant has D = 140 mm, while the 120x150x13 variant has D = 150 mm.

Can a 120x150x13 seal replace a 120x140x13 seal?

Direct interchangeability should not be assumed. Their nominal outside diameters differ by 10 mm, so they are different dimensional variants.

Is another 120x140x13 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® 120x140x13 NBR AO/TC is a double lip radial shaft seal with nominal dimensions of d = 120 mm, D = 140 mm and B = 13 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.