Convert STEP to X_T

A CAD system may require Parasolid geometry in .x_t format when a STEP model must be edited, simulated, or exchanged in a Parasolid-based workflow. Converting the file also helps deliver a compatible model to software that does not import the original STEP variant reliably.

What the STEP format is

STEP, usually identified by .step or .stp, is the ISO 10303 standard for exchanging precise product-model data between CAD systems. AP203, AP214, and AP242 files can contain solid and surface geometry, assemblies, colors, names, units, and, depending on the application and schema, product-manufacturing information or PMI.

Mechanical CAD systems including SolidWorks, Siemens NX, Solid Edge, CATIA, Creo, Autodesk Inventor, and FreeCAD can import or export STEP. STEP is commonly used when a model must move between vendors without distributing a proprietary native project file.

What the X_T format is

.x_t is the text Parasolid transmission format used by the Parasolid geometric modeling kernel. Parasolid-based applications such as SolidWorks, Siemens NX, and Solid Edge can use it to exchange accurate solid and surface boundary-representation geometry.

X_T can preserve analytic faces, trimmed surfaces, topology, units, and body geometry in a form that Parasolid-based software can process directly. It does not normally preserve the source application’s feature tree, sketches, constraints, mates, or parametric design history. The related binary format is .x_b; it may be smaller or faster to process, but the recipient must explicitly support it.

Desktop conversion methods

Using SolidWorks

1. Open the .step or .stp file with File → Open.
2. Review the imported solid and surface bodies. Resolve failed faces or gaps with the available import-diagnostics and healing tools.
3. Use File → Save As, select Parasolid (*.x_t), and choose the required Parasolid version if the dialog provides that option.
4. For an assembly, confirm whether the export should retain the assembly structure or write separate part files; the available behavior depends on the SolidWorks release and export settings.
5. Reopen the exported file in the destination system and check body count, units, dimensions, holes, fillets, thin walls, and component placement.

Using Solid Edge or Siemens NX

1. Import the STEP file with File → Open or the product’s STEP import command.
2. Check the import report for invalid faces, gaps, failed solids, and unit interpretation. Run geometry healing or stitching where required.
3. Use File → Save As or the relevant export command and select Parasolid text format, .x_t.
4. Choose a Parasolid compatibility version supported by the receiving application, then export the required parts or complete assembly.
5. Open the result in the target CAD system and validate both geometry and assembly placement.

Using CAD Exchanger Desktop

1. Open the STEP file in CAD Exchanger Desktop.
2. Check the assembly tree, units, component visibility, and imported bodies.
3. Use Export, select Parasolid XT or .x_t, and configure the output as a structured assembly or separate part files when those options are available.
4. Load the exported file in the destination CAD application and inspect the translated model.

Online conversion

CAD Exchanger Cloud can convert STEP to Parasolid XT through a browser. Upload the file, choose Parasolid XT or .x_t as the output, download the result, and verify it in the target CAD system. Online services may impose file-size, assembly, version, or export-feature limits, so test a representative file before batch conversion.

Do not upload confidential, export-controlled, or contract-restricted designs unless the service’s storage, processing, and deletion terms meet the project requirements. Desktop software is preferable when the geometry cannot leave the organization.

Quality and compatibility limitations

STEP-to-X_T conversion is a translation between exchange representations, not a conversion into the original native CAD model. Parametric features, sketches, constraints, design history, mates, application-specific attributes, and some PMI commonly become unavailable or non-editable. The resulting bodies usually require direct modeling or feature-recognition tools for further edits.

Parasolid compatibility depends on the receiving application and its Parasolid kernel version. A file exported with a newer version may not open in older software; select an older supported version when the exporter permits it, or ask the recipient which version to use.

Verify units instead of relying on document defaults. Measure several known dimensions after import, then inspect small fillets, thin walls, sewing boundaries, boolean results, and very small features, which are frequent locations for translation errors.

For assemblies, verify component names, external file references, colors, suppressed components, and transforms. Some exporters produce one multi-body Parasolid file, while others produce an assembly file with separate part files. Keep the original STEP file, exported files, converter version, and conversion log for traceability.