10 July 2023

The STC CAD models are simplified versions of the NIST FTC models.  The STC
remove some of the more complicated and less commonly used PMI, including all 
datum targets.

This is version 2 of the NIST STC CAD models.  The CATIA and NX models were 
updated, however, the Inventor models were not.  The PDF file contains 3D PDFs
of all of the updated models.

The updated CATIA and NX models were verified with CADIQ and to make them as 
equivalent as possible.  There are still a few differences, but much better 
than the first version of the models.

Use the latest version of the NIST STEP File Analyzer and Viewer to check STEP
AP242 files that you can export from the CAD models.

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24 July 2023

The CATIA CAD models for STC 8 and 9 have been updated.

The single 3D PDF was replaced by files for each STC model.  After opening a
3D PDF file, click Options to Trust the file.  Then click on the model to
activate 3D navigation.  Then you can click on the save views at the bottom.

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29 August 2023

The CATIA CAD model for STC 8 and all of the Inventor models have been updated.

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7 September 2023

The CATIA CAD model for STC 9 was updated.

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9 January 2024

This is version 3 of the NIST STC CAD models.  The CATIA and NX models were 
updated, however, the Inventor models were not.  The PDF files contains 3D PDFs
of all of the updated models.  The CATIA models are now V5-6R2023.

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18 March 2024

This is version 4 of the NIST STC CAD models.  There are now Creo 10 versions of
the STC models.  The other models have not changed.
