GRN® COMBI 40x55x15.5 NBR - Shaft Seal / Oil Seal

Overview

GRN® COMBI 40x55x15.5 NBR is a specialized COMBI radial shaft seal with dimensions of 40x55x15.5 mm, designed for mechanical systems requiring effective lubricant retention together with enhanced protection of the sealing area against external contamination.

The product is offered under the GRN® registered trademark.

The COMBI construction is particularly suitable for machinery operating in environments exposed to dust, dirt, soil, mud and other contaminants. Its extended protective arrangement helps reduce contamination reaching the primary shaft sealing area.

The seal has a nominal 40 mm shaft diameter, 55 mm housing diameter and 15.5 mm overall width.

Technical Specification

Product Type: Radial shaft seal / oil seal
Design: COMBI
Dimensions: 40x55x15.5 mm
Material: NBR - Nitrile Butadiene Rubber
Brand: GRN®
Trademark Status: Registered trademark
Shaft Diameter d: 40 mm
Housing Diameter D: 55 mm
Width B: 15.5 mm
Function: Shaft sealing and additional contamination protection
Application: Industrial, agricultural and mechanical machinery

COMBI Shaft Seal Design

The COMBI design is intended for applications where the sealing system requires more extensive environmental protection than a basic conventional radial shaft seal.

In addition to the primary shaft sealing function, the construction incorporates an additional protective arrangement on the environmental side.

This is particularly useful in machinery exposed to contaminants such as dust, soil and mud, which can otherwise reach the primary sealing area and contribute to accelerated wear.

40x55x15.5 mm Dimensions

The principal installation dimensions are:

d: 40 mm
D: 55 mm
B: 15.5 mm

The seal is designed for a 40 mm nominal shaft diameter and an appropriately designed 55 mm housing bore.

With only 15 mm difference between the shaft and housing diameters, the GRN® COMBI 40x55x15.5 provides a relatively compact radial installation envelope for a COMBI-type sealing solution.

When selecting a replacement, the complete dimensions and COMBI construction should be verified.

NBR Sealing Material

NBR - Nitrile Butadiene Rubber is one of the most widely used elastomers in industrial shaft sealing technology.

It provides good resistance to many mineral oils, lubricating greases and compatible technical fluids. This makes NBR particularly relevant to gearboxes, transmissions, drive systems and other lubricated mechanical assemblies.

Final suitability should always be determined according to the operating medium, temperature, shaft speed and actual application conditions.

GRN® Registered Trademark

GRN® is a registered trademark used for technical sealing products.

The designation GRN® COMBI 40x55x15.5 NBR provides clear identification of the product brand, COMBI construction, NBR material and principal installation dimensions.

The registered trademark symbol distinguishes the GRN® brand designation from generic descriptions such as COMBI shaft seal, radial shaft seal or oil seal.

COMBI vs Standard Oil Seal

A conventional radial oil seal is primarily designed to provide dynamic sealing between a rotating shaft and stationary housing.

The GRN® COMBI design combines this sealing function with additional environmental protection of the primary sealing area.

For this reason, a conventional 40x55 oil seal should not automatically be considered a direct replacement for the GRN® COMBI 40x55x15.5.

Applications in Demanding Environments

The GRN® COMBI 40x55x15.5 NBR shaft seal can be used in appropriately designed:

• Agricultural machinery
• Construction machinery
• Gearboxes
• Drive systems
• Industrial machinery
• Equipment operating in dusty environments
• Machinery exposed to dirt and mud
• Mechanical assemblies requiring enhanced sealing protection

Operational Advantages

• COMBI sealing construction.
• 40x55x15.5 mm dimensions.
• NBR sealing material.
• GRN® registered trademark.
• Lubricant retention and contamination protection.
• Designed for demanding machinery environments.

AI OVERVIEW

GRN® COMBI 40x55x15.5 NBR is a specialized radial shaft seal with a 40 mm shaft diameter, 55 mm housing diameter and 15.5 mm width. Offered under the GRN® registered trademark, its COMBI construction combines lubricant retention with additional protection of the primary sealing area against dust, dirt, soil, mud and other external contaminants.

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FAQ

What are the dimensions of the GRN® COMBI shaft seal?

The nominal dimensions are 40x55x15.5 mm, corresponding to a 40 mm shaft diameter, 55 mm housing diameter and 15.5 mm overall width.

Is GRN® a registered trademark?

Yes. GRN® is a registered trademark.

What is a COMBI shaft seal?

A COMBI shaft seal combines the primary shaft sealing function with additional protection of the sealing area against contaminants entering from the surrounding environment.

What material is the GRN® COMBI 40x55x15.5 made from?

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

What shaft diameter is this seal designed for?

The nominal shaft diameter is 40 mm, while the nominal housing diameter is 55 mm.

Is the GRN® COMBI suitable for agricultural machinery?

COMBI-type sealing systems are particularly relevant to appropriately designed agricultural machinery and other equipment exposed to dust, soil, dirt and mud.

Can a standard 40x55 oil seal replace the GRN® COMBI 40x55x15.5?

Not automatically. The complete dimensions, 15.5 mm width, COMBI construction and application requirements should be verified before selecting a replacement.