How to convert CATPART to STEP
- Add your .CATPART file - drop it in the box above or click to browse.
- Convert it to .STEP in a few seconds.
- Download your new .STEP file.
What to expect
- The CATIA feature tree - sketches, pad depths, pocket dimensions, and fillet parameters - does not transfer; STEP carries exact B-rep solid geometry only.
- STEP AP214 (the common default) transfers solid geometry and basic color; choose AP242 when the downstream tool needs embedded PMI tolerances and surface-finish callouts.
- If a tool fails to import a newer
.CATPart, ask the original author to export STEP directly from CATIA - this bypasses version-compatibility issues entirely.
Frequently asked questions
Can I convert CATPart to STEP without CATIA?
Yes. CAD Assistant (Open Cascade) is free, reads
.CATPart on Windows, macOS, and Linux, and exports STEP. Fusion 360 also handles this at no cost for personal use.Will the STEP file open in SolidWorks, Inventor, or FreeCAD?
Yes - STEP is universally supported in those tools. Open it with File > Open and select STEP; the part loads as a solid body without the CATIA history.
What is lost when converting CATPart to STEP?
The parametric feature tree (sketches, constraints, material assignments) is lost; the exact 3D surfaces and edges are fully preserved.
Should I export AP214 or AP242?
AP214 covers solid geometry and color and opens in virtually every CAD system; choose AP242 only when the recipient needs embedded PMI annotations such as tolerances and surface-finish callouts.
Programs that convert CATPART: CATIA · Autodesk Inventor · CrossManager · 3ds Max (3D Studio Max) · Alibre Design Professional · TransMagic · EnSuite · 3D-Tool
