Both the 3D object (.obj) and ISO STEP (.stp, .step) engineering formats are quite common and well supported in various 3D modeling / CAD software. So you should have no problem with finding some tools capable of conversion of models from .obj files to .stp files. Some good picks are listed below.
Home > Search converters: obj to stp
Conversion of obj file format to stp file format beta
Search for obj to stp converter or software able to handle these file types.
Convert 3D object graphics to ISO-10303 STEP product data.
We have found 12 software records in our database eligible for .obj to .stp file format conversion.
Microsoft Windows software 
- convert obj to stp on Windows
SolidWorks
A popular is 2D and 3D CAD (computer-aided design) and CAE (computer-aided engineering) construction software for Microsoft Windows developed by SolidWorks Corporation.
SolidWorks is distributed in three distributions: Solidworks Premium, Solidworks Professional and SolidWorks Standard.
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from obj file | No | No | No | No | No | Yes | No | No |
to stp file | No | No | No | No | No | Yes | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned obj to stp. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
3D Object Converter
3D Object Converter is a powerful 3D polygon model translation and interactive viewing shareware tool that allows arbitrary 3D model data to be imported from external sources, exported to various industry standard 3D file formats with great accuracy and quality.
AnyCAD Exchange3D
A free 3D model converter utility, Exchange3D supports to many popular 3D file formats, and you can use it to convert models to other formats, such as iges, step, stl, fbx, dae, 3ds, md2, mdl, obj and more.
3ds Max (3D Studio Max)
A popular 3D animation software, 3ds Max (previously known as 3D Studio Max) is used by professional to create stunning 3D content. It contains modeling capabilities, flexible plug-in architecture, scripting language, etc. It is mostly used by computer game developers. It is also used to create movie visual effects. 3ds Max is only for Microsoft Windows.
Autoconverter
A dedicated CAD converter for Windows, Autoconverter supports transformation of several 3D formats between different formats.
TransMagic
A CAD translation software, TransMagic offers support of all major formats and standards, including CATIA, Pro/Engineer, Autodesk Inventor, AutoCAD, SolidWorks, ACIS, Parasolid and more.
CrossManager
A dedicated CAD converter with a large file format support that allows users to convert (translate) CAD designs or drawings between different formats. CrossManager is a commercial product, you will need to purchase a license. It is available in English, French, German, Italian, Czech, Chinese, Russian and Korean language.
Alibre Design Professional
A set of 3D modeling tools for Microsoft Windows, Alibre Design Professional is used for the fast creation of complex geometry and other 3D modeling purposes.
Multiplatform software 
- convert obj to stp on any platform
Autodesk Fusion 360
A cloud 3D CAD/CAM tool, Fusion 360 is used for mechanical design, collaboration, and machining. Access your designs virtually anytime, anywhere from your Mac, PC, or mobile device.
FreeCAD
FreeCAD is open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler used to design mechanical engineering projects.
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