What Is Induction Shrink Fitting?

Induction shrink fitting is a process in which a precise electromagnetic field is used to heat and thermally expand an electrically conductive material prior to assembly, resulting in an interference fit joint upon return to ambient temperature.

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What Is Induction Shrink Fitting?

Induction shrink fitting is a process in which a precise electromagnetic field is used to heat and thermally expand an electrically conductive material prior to assembly, resulting in an interference fit joint upon return to ambient temperature.

shrink fitting with induction image

What Benefits Does Induction shrink-fitting Offer? 

  • Meets tight production tolerances with precise localized heat to small areas creating pinpoint accuracy

  • Increases production rates with faster heating cycles

  • Reduces defect rates with repeatable, reliable heat

  • Eliminates variability from operator-to-operator, shift-to-shift

  • Maintains metallurgical characteristics of the individual metals

Popular Induction shrink-fitting Application Notes

Select from our most requested shrink-fitting notes to learn how induction can improve the efficiency, effectiveness and safety of your heating process.


Shrink Fitting a Steel Part into the CasingShrink Fitting a Steel Part into the Casing

A specially designed multiple turn internal helical coil was used to provide the heat to the various steel parts.

Shrink Fitting Magnetic Steel PistonsShrink Fitting Magnetic Steel Pistons

Using induction for shrink-fitting magnetic steel pistons onto a chrome shaft; the client was using an unreliable handheld induction system and wanted a higher quality induction shrink-fitting solution.

Heating Hammer Bits for Shrink FittingHeating Hammer Bits for Shrink Fitting

Shrink-fitting hammer bits with induction for the insertion of carbide buttons; the end product is a drilling tool for the oil and gas industry.

Shrink Fitting a Magnetic Steel GearShrink Fitting a Magnetic Steel Gear

Induction shrink-fitting with EASYHEAT takes 45 minutes to heat the sample to the required temperature. The current oven process takes over two hours.

Shrink Fitting of BearingsShrink Fitting of Bearings

A multi-turn helical coil delivers uniform heat to the entire range of the bearing sizes in the transverse mode.


Shrink Fitting an Aluminum Tube (optical system)Shrink Fitting an Aluminum Tube (optical system)

With an EASYHEAT 2 kW induction shrink-fitting system, the aluminum tube heated to the required temperature within 30 seconds. Shrink fitting then took place

Shrink fitting an automotive aluminum motor housingShrink fitting an automotive aluminum motor housing

Induction shrink-fitting is fast, presents significant energy savings over an electric oven, requires a more modest footprint than an oven and can be easily integrated into an automated process

Inserting a Steel Bushing to an Aluminum HubInserting a Steel Bushing to an Aluminum Hub

The client currently uses an electric oven and the heating time is two hours, so at 60 seconds, the time savings with induction shrink-fitting is very significant

Shrink Fitting A Gear to a Shaft (Automotive)Shrink Fitting A Gear to a Shaft (Automotive)

The customer was using a torch, which can lead to inconsistent part quality. Induction's precise heating means the client can count on consistent results in their process

Shrink Fitting an Aluminum Motor HousingShrink Fitting an Aluminum Motor Housing

The customer was using a cold press, but it was creating part defects. This was resolved with induction heating: the process took just two minutes compared to 40 minutes and they were able to achieve their targeted production rate.

More shrink-fitting Application Notes


Frequently Asked shrink-fitting Questions


popular shrink fitting note

Popular Shrink Fitting Video


Induction shrink-fitting Resources:

Select from our libraries of materials to help you better understand the benefits shrink-fitting with induction heating can bring to your process.

About Induction Heating

Induction heating is a fast, efficient, precise and repeatable non-contact method for heating metals or other electrically-conductive materials. The material may be a metal such as brass, aluminum, copper or steel or it can be a semiconductor such as silicon carbide, carbon or graphite. To heat non-conductive materials such as plastics or glass, induction is used to heat an electrically-conductive susceptor, typically graphite, which then transfers the heat to the non-conducting material.

Read our 4-page brochure; learn more about how the science of induction technology can solve your precision heating problems.

Read 'About Induction Heating'

Brochure: About Induction Heating

Induction Heating Work Coils

The work coil is the component in the induction heating system that defines how effective and how efficiently your work piece is heated.

Read our informative brochure explaining the fundamentals of induction coils and their design.

Read 'Induction Heating Work Coils'

Induction Heating Work Coils

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