Key dimensioning and verification in a shaft hub connection

The spreadsheet verifies the key element in a connection of shaft in hub.

Three sections are reported:

  1. It reports a simplified calculation of the key considering the transferring torque moment
  2. The previous verification is repeated considering other parameters such the ductility of the materials and the relevant participation factors. Then it is calculated the contact pressure and it is verified the key, the shaft and the hub to the related stresses
  3. It reports a calculation of the approximated mean stresses in the hub section considering the reduced area given by the key housing

One or more keys can be selected.

The Italian language option is available.

See video.



The spreadsheet you will purchase and receive is an excel file compiled in a “.EXE” application file format identified by our icon image. See the Activation/Support page for more details.

Trial version

You can download a trial version of this spreadsheet for evaluation purpose. Click below to download the zipped file.

The trial version has a limited number of runs from its first activation on your computer, after that it stops to work and a new activation key is needed or the full version should be purchased.

To activate it, unzip the downloaded file, run the application and insert the Activation Key you will find in the .TXT file.

After key validation, the runs count starts on your machine and a window is displayed at each launch reminding you the remained launches. 

To purchase the full version go back to this webpage or use the “Purchase Online” button on the window.


The trial spreadsheet is fully working with the following limitations:

  • Expiration runs
  • It is not possible to open/save external spreadsheets when it runs
  • Excel toolbar is not visible
  • Print function is disable
  • Copy and paste functions are disable
  • Save function is disable

 What you will find in the full version

  • No expiration 
  • It is possible to open/save external spreadsheets when it runs
  • Excel toolbar is visible
  • Print function is available
  • Save function is available
  • Copy and paste functions are available

For support and questions contact us.



Shaft Key Dimensioning v 1.1 - Trial version
Shaft Key Dimensioning v 1.1 - Trial ver
Compressed Archive in ZIP Format 15.3 MB


Spreadsheet versions list:


Version 1.1: New .EXE file format for the spreadsheet. When launching the .EXE file, Excel is started and the protected workbook is opened as if you had opened it the regular way. See Activation/Support page for more information.


Version 1.0: new introduced file.

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