フォーマットガイド
The universal engineering exchange format — exact geometry, assembly structure, and metadata in one file.
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| Extension | .stp, .step |
|---|---|
| Full name | Standard for the Exchange of Product Data |
| Standard | ISO 10303 |
| Geometry type | Solid / NURBS (exact boundary representation) |
| Variants | AP203, AP214, AP242 |
| Open standard | Yes |
| Supports color | AP214, AP242 only |
| Supports assemblies | Yes |
STEP (Standard for the Exchange of Product Data) is an ISO 10303 standard for 3D model data exchange. It stores exact boundary-representation geometry rather than a mesh approximation. STEP is the most widely used neutral format for transferring 3D models between different CAD systems. Three AP variants are common: AP203 (geometry only), AP214 (adds color and layers) and AP242 (modern successor with PMI annotations).
Transfer 3D models between SolidWorks, CATIA, Siemens NX, Creo and other CAD platforms without losing solid geometry.
Send parts to suppliers, manufacturers, and CNC shops. STEP is the lingua franca of mechanical engineering.
As an open ISO standard, STEP files are ideal for archiving product data for decades.
SolidWorks, CATIA, Siemens NX, PTC Creo, Autodesk Fusion 360, AutoCAD, FreeCAD, Rhino and virtually all professional CAD systems.
Commonly converted to STL or 3MF for 3D printing, to OBJ for rendering, to glTF/GLB for web and AR, or to IGES for legacy CAD compatibility.