Convert DGN to PRT

Understanding DGN and PRT file formats

DGN is a CAD file format primarily used by Bentley Systems' MicroStation and other engineering design software. It is widely adopted in civil engineering, construction, and infrastructure projects for storing 2D/3D vector graphics and design data.

PRT files are part files used by Siemens NX (formerly Unigraphics), a high-end CAD/CAM/CAE software. These files store 3D models, assemblies, and design data for product development and manufacturing.

Why convert DGN to PRT?

Converting DGN to PRT is essential when transferring civil or architectural designs from MicroStation to Siemens NX for advanced modeling, simulation, or manufacturing processes. This ensures seamless collaboration between different engineering teams and software platforms.

How to convert DGN to PRT

Direct conversion from DGN to PRT is not natively supported by most CAD software. The typical workflow involves an intermediate format, such as STEP (.stp/.step) or IGES (.igs/.iges), which both MicroStation and Siemens NX support.

1. Open your DGN file in Bentley MicroStation.
2. Export the design to a neutral format:
   • File → Export → STEP or File → Export → IGES
3. Launch Siemens NX.
4. Import the exported STEP or IGES file:
   • File → Import → STEP or File → Import → IGES
5. Save the imported model as a PRT file:
   • File → Save As → Part (*.prt)

Best software for DGN to PRT conversion

The most reliable method is using Bentley MicroStation for exporting DGN files and Siemens NX for importing and saving as PRT. For batch conversions or automation, consider using Autodesk Inventor or SolidWorks as intermediaries, as they also support STEP/IGES workflows.

Tips for successful conversion

• Check geometry and data integrity after importing into Siemens NX.
• Use the latest versions of both MicroStation and Siemens NX for best compatibility.
• Clean up and simplify your DGN file before export to avoid conversion errors.