Diameter symbol appearing as MOD-DIAM

header solidworks issue

Tech Help / April 7, 2025

Diameter Symbol appearing as MOD-DIAM instead of showing properly in SOLIDWORKS Drawing

You may see diameter callout syntax labeled <MOD-DIAM> on a SOLIDWORKS Drawing instead of the correct diameter symbol. This is a common issue, and we'll provide a solution in this article.

mod-diam solidworks diameter icon

This can sometimes happen after a SOLIDWORKS major version, or just service pack upgrade. If the folder path changes during the upgrade, sometimes SOLIDWORKS CAD cannot find the symbol library file called "gtol.sym".

How to fix this Diameter Symbol Appearing as <MOD-DIAM>

To resolve this issue...

  1. Look for the gtol.sym file on your workstation. The default location for the file is located here: C:\Program Files\SolidWorks\lang\English or C:\ProgramData\SOLIDWORKS <version>\lang\English
  2. In SOLIDWORKS CAD, open the system options by navigating to Tools -> then Options -> System Options -> File Locations
  3. Select "Symbol Library File" in the dropdown.
  4. If the folder selection is not pointing to the location where gtol.sym resides, then delete and replace the folder location with the correct location.

File Location MOD-DIAM diameter icon solidworks

 

MOD-DIAM diameter icon solidworks gone

The diameter symbol should now show properly and the issue should be resolved. Please feel free to reach out to Converge Support if this doesn't solve your issue, or if you have any other specific SOLIDWORKS issues.

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Article by Phillip Lewis, CSWE

 

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