Trimech-Main-Site-Group-Navigation Trimech-Main-Site-Group-Navigation Trimech-Main-Site-Group-Navigation Solid-Solutions-Group-Navigation Javelin-Group-Navigation Solid-Print-Group-Navigation 3DPRINTUK-Group-Navigation Trimech-Enterprise-Solutions-Group-Navigation Trimech-Enterprise-Solutions-Group-Navigation Trimech-Advanced-Manufacturing-Group-Navigation Trimech-Staffing-Solutions-Group-Navigation
With over 35 years of experience, the TriMech Group offers a comprehensive range of design, engineering, staffing and manufacturing solutions backed by experience and expertise that is unrivalled in the industry. The TriMech Group's solutions are delivered by the divisions and brands shown here, use the links above to visit the group's websites and learn more.

How to Fix <MOD-DIAM> in SOLIDWORKS Dimensions

Monday February 20, 2023 at 9:00am

Sometimes after performing an upgrade of SOLIDWORKS, diameter symbols no longer display properly and give a <MOD-DIAM> message instead.

You may also notice this issue after Windows has installed updates.

Either way, you’re seeing <MOD-DIAM> in place of diameter symbols in drawings, parts or assemblies. Here’s a simple, step-by-step guide to fix <MOD-DIAM> errors.


  1. Within SOLIDWORKS, go to the Options cog and open the System Options.
  2. Select File Locations and in the drop-down menu choose Symbol Library File.
  3. Select the currently visible directory and delete it. Don’t worry, we’ll replace it in the next step.
  4. Click Add and navigate to the location of your Symbol Library file. By default this is:

    C:\ProgramData\SOLIDWORKS\SOLIDWORKS 20XX\lang\english

    NB: ProgramData is a hidden folder. If you do not see it in your list of folders on your C: drive, head to Windows Explorer > View and select the Hidden Items checkbox.

  5. Select OK and accept any Windows Firewall messages.

SOLIDWORKS dimensions should now display the diameter symbol.


That's a tricky question! As SOLIDWORKS settings are completely customisable, you have the freedom to set yours up however you feel is comfortable.

For new users, however, we recommend watching this video to find out what the best SOLIDWORKS settings are for getting started.

Take the Next Steps...

Enhance your CAD skills and book on to one of our CPD-accredited training courses!

Whether you’re a beginner or are intimately familiar with CAD, our friendly and expert trainers are ready to help you get the most out of SOLIDWORKS, either online or in a classroom local to you.

Related Blog Posts

How to Find Your SOLIDWORKS Serial Number
SOLIDWORKS serial numbers can be found within the Help section of your SOLIDWORKS session and within your Windows Registry.
Top 3 Benefits of SOLIDWORKS Composer
Discover the three key benefits SOLIDWORKS Composer and how they apply to businesses in any industry.
What are the Best File Formats to Export from SOLI
Discover the best neutral file formats to use when exporting files from SOLIDWORKS.

 Solid Solutions | Trimech Group