Convert PAR to STEP

A supplier, CAM system, inspection package, or customer CAD application may require STEP because it cannot read a native Solid Edge part. Exporting a .par file creates a neutral 3D model for exchange while leaving the original Solid Edge document unchanged.

PAR format

A PAR file is normally a Siemens Solid Edge native part document. It can contain ordered or synchronous geometry, sketches, feature definitions, dimensions, material data, custom properties, and one or more solid or surface bodies.

Do not assume every file ending in .par is CAD data. .par and .par2 are also used for parity-recovery files, which cannot be converted to CAD. Open the file in Solid Edge or inspect its source before proceeding.

Extensions such as .prt, .part, and .par are not interchangeable CAD formats. Renaming a file extension does not convert it and can prevent the correct application from recognizing the file.

STEP format

STEP, formally ISO 10303, is a neutral CAD exchange format saved as .step or .stp. It commonly transfers boundary-representation solids, surfaces, curves, colors, layers, names, and selected product metadata between CAD, CAM, inspection, and PDM applications.

STEP is widely accepted by Siemens NX, SOLIDWORKS, CATIA, Creo, Autodesk Inventor, Fusion, Mastercam, and metrology software. STEP also provides a more durable exchange and archive format than a vendor-native CAD file.

When the export settings offer STEP application protocols, use the recipient's requested protocol. AP242 can carry modern product data and PMI where both applications support it; AP214 is common for older workflows; AP203 is a legacy geometry-focused fallback. Protocol support and retained data depend on the exporter and importing application.

Export with Solid Edge

Solid Edge is the preferred converter because it reads its native PAR format directly.

1. Open the .par document in Solid Edge. Resolve any missing links or failed geometry, then activate the required model state if the file provides alternatives.
2. Select File → Save As → Save As Translated. In some releases, select a STEP type directly from File → Save As.
3. Choose STEP (*.stp) or STEP (*.step), enter an output name such as housing.step, and open the translation options if available.
4. Select the requested STEP protocol and retain units, colors, names, and PMI only when the recipient requires and supports them.
5. Save the file, then reopen it in Solid Edge or, preferably, the recipient's target application. Check bodies, dimensions, holes, fillets, and orientation.

Other conversion options

CAD Exchanger Lab can import supported Solid Edge PAR versions and export STEP. Open the part, inspect the geometry and model tree, then use Export → STEP. Confirm that the installed version supports the source Solid Edge release before relying on it for production data.

CAD Exchanger Cloud is a practical browser-based option for non-confidential files when its current format list supports the PAR source version. Upload the model, select STEP as the output format, download the result, and validate it locally. Do not upload controlled drawings, customer models, export-controlled data, or other sensitive designs unless the service's security terms and your organization permit it.

Compatibility checks

STEP normally transfers resulting geometry, not the editable Solid Edge feature history. Sketch constraints, ordered features, synchronous relationships, variables, equations, and feature parameters usually import as a dumb solid or surface model.

A STEP file normally carries unit information, but an incorrect import-unit override can scale a millimeter model by 25.4 when interpreted as inches, or the reverse. Verify at least one known dimension after import.

A PAR file is a part document. If the recipient needs an assembly with component names and structure, open the Solid Edge .asm assembly and export from that document; exporting an individual PAR file produces only that part.

PMI, GD&T, sheet-metal bend information, custom properties, face identifiers, and colors may transfer incompletely. Send the authoritative drawing or PDF with the STEP file when manufacturing tolerances, bend notes, finishes, or inspection requirements are required.