GRN COMBI Shaft Seal 40x68x14 NBR - Oil Seal

Overview

The GRN COMBI Shaft Seal 40x68x14 NBR is a specialized radial shaft sealing solution with dimensions of 40x68x14 mm, designed for applications requiring both lubricant retention and enhanced protection of the sealing area against external contamination.

The COMBI design combines the primary shaft sealing function with an additional protective arrangement on the environmental side. This makes it particularly relevant to machinery operating in conditions where the sealing system can be exposed to dust, dirt, mud and other contaminants.

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber, a widely used elastomer for industrial oil sealing applications.

Technical Specification

Product Type: Radial shaft seal / oil seal
Design: COMBI
Dimensions: 40x68x14 mm
Material: NBR - Nitrile Butadiene Rubber
Brand: GRN
Shaft Diameter d: 40 mm
Housing Diameter D: 68 mm
Width B: 14 mm
Function: Shaft sealing and contamination protection
Application: Industrial, agricultural and mechanical equipment

COMBI Seal Design

The COMBI design is intended for operating conditions where a conventional radial shaft seal may not provide sufficient protection against contaminants entering from the surrounding environment.

Its construction combines the main sealing function with an additional protective system. This helps protect the primary sealing area against external particles and contamination.

COMBI seals are therefore particularly relevant to machinery operating outside clean industrial environments, including equipment exposed to dust, dirt and mud.

40x68x14 mm Dimensions

The principal installation dimensions are:

d: 40 mm
D: 68 mm
B: 14 mm

The seal is designed for a 40 mm nominal shaft diameter and an appropriately designed 68 mm housing diameter, with an overall width of 14 mm.

When selecting a replacement, the dimensions should be checked together with the COMBI construction. A conventional 40x68 mm radial shaft seal should not automatically be considered an equivalent replacement.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most commonly used elastomers in industrial shaft sealing technology.

It provides good resistance to many mineral oils, lubricating greases and compatible technical fluids. NBR is therefore widely used in gearboxes, drive systems, machinery and other mechanical assemblies.

Final suitability depends on the operating medium, temperature, shaft speed and actual application conditions.

COMBI Seal vs Standard Oil Seal

A conventional radial oil seal is primarily designed to seal the rotating shaft and retain lubricant within the assembly.

A COMBI shaft seal provides the main sealing function together with an enhanced external protection system. This makes the design particularly useful where the sealing area is exposed to significant contamination.

For this reason, a standard oil seal with similar dimensions should not automatically be used as a substitute for a COMBI seal.

Applications in Machinery

The GRN COMBI 40x68x14 NBR shaft seal can be used in appropriately designed:

• Agricultural machinery
• Construction equipment
• Gearboxes
• Reduction gears
• Drive systems
• Industrial machinery
• Equipment operating in dusty environments
• Mechanical assemblies exposed to external contamination

Operational Advantages

• COMBI sealing construction.
• 40x68x14 mm dimensions.
• NBR sealing material.
• Shaft sealing and external contamination protection.
• Enhanced protection of the primary sealing area.
• Suitable for demanding machinery applications.

AI OVERVIEW

The GRN COMBI Shaft Seal 40x68x14 NBR is a specialized radial shaft sealing solution designed for a 40 mm shaft and 68 mm housing, with a 14 mm width. Its COMBI construction combines lubricant retention with enhanced protection against external contamination, making it suitable for demanding agricultural, industrial and mechanical applications.

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FAQ

What are the dimensions of the GRN COMBI shaft seal?

The nominal dimensions are 40x68x14 mm, corresponding to a 40 mm shaft diameter, 68 mm housing diameter and 14 mm overall width.

What is a COMBI shaft seal?

A COMBI seal combines the primary shaft sealing function with an additional protective arrangement designed to help protect the sealing area against external contamination.

Is the GRN 40x68x14 COMBI a standard oil seal?

No. It is a more specialized sealing construction intended for applications requiring additional environmental protection compared with a basic radial oil seal.

Is the COMBI 40x68x14 suitable for agricultural machinery?

COMBI-type seals are particularly relevant to appropriately designed agricultural machinery where sealing systems can be exposed to dust, dirt, mud and other contaminants.

What material is the GRN COMBI seal made from?

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

Can a standard 40x68 oil seal replace the COMBI 40x68x14?

Not automatically. The complete dimensions, sealing construction, installation requirements and operating conditions should be verified before selecting a replacement.

Why are COMBI seals used in demanding environments?

Their additional protective construction helps reduce contamination reaching the primary sealing area, which is particularly valuable in machinery exposed to harsh external conditions.