Convert SAT to STEP
Convert ACIS SAT geometry to STEP for CAD exchange, PLM import, and manufacturing handoff.
Make STEP files online
We can't read SAT files yet, so this conversion isn't available. If you can export your work to one of these formats - or others - we'll turn it into STEP:
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How to convert sat to step file
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A supplier portal, PLM repository, or manufacturing service may require a STEP file when the available model is an ACIS SAT file. Converting the boundary-representation model preserves solid and surface geometry more effectively than exporting a viewing mesh such as STL.
What the SAT format is
SAT is the native text-based file format associated with Spatial’s ACIS geometric modeling kernel. It stores boundary-representation geometry, including solids, surfaces, faces, edges, curves, topology, and some attributes supported by the exporting application.
CAD systems built around ACIS use .sat files to exchange parts or groups of bodies. Autodesk AutoCAD, Autodesk Inventor, BricsCAD, and other engineering applications can import or export SAT, although supported SAT revisions and preserved attributes vary by release. SAT is mainly a geometry-exchange format; it normally does not contain the source system’s parametric feature history, sketches, constraints, or assembly relationships in a form another CAD system can edit.
What the STEP format is
STEP, commonly saved as .step or .stp, is the ISO 10303 family of CAD exchange formats. It can represent B-rep solids, open and trimmed surfaces, assemblies, colors, names, and selected product or manufacturing data.
STEP is widely accepted for supplier handoffs, PLM import, manufacturing quotations, archival exchange, and transfer between unrelated CAD systems. AP242 is a suitable modern choice when both systems support it; AP214 remains common in mechanical CAD workflows, while AP203 is an older compatibility option. The protocol does not guarantee that every application will preserve the same metadata or assembly structure.
How to convert the file
The most reliable workflow uses a CAD application or translator that can both read ACIS SAT and write STEP.
- Keep a copy of the original
model.satfile and check whether it contains solids, open surfaces, or multiple bodies. - Open the file in a compatible application. If automatic detection fails, choose ACIS SAT explicitly in the file-type filter.
- Review the imported model tree and any translation messages. Confirm that the expected bodies, surfaces, and assembly components are present.
- Use File → Export or File → Save As, select STEP, and choose
.stepor.stpas the output extension. - Choose AP242, AP214, or AP203 only if the export options provide that choice and the receiving system supports the selected protocol.
- Open the exported file in a separate STEP-capable viewer or CAD system. Check units, body count, critical dimensions, holes, fillets, thin walls, gaps, and assembly placement.
Desktop software options
CAD Exchanger Desktop is a dedicated translator for Windows, macOS, and Linux that supports SAT input and STEP output. Open the file with File → Open, inspect the imported bodies, then use the export or save command to select STEP and configure the available protocol and unit options. Its exact menus and supported entities depend on the installed version.
Autodesk Inventor can import SAT and export STEP when the relevant translators are included in the installation. Open the file with File → Open, select ACIS SAT if necessary, review any translation warnings, then use File → Save As → Save Copy As and select STEP. Verify the result in another STEP reader rather than assuming that a successful save means every entity transferred.
Other mechanical CAD systems can perform the same conversion if their import and export translators support both formats. A program that only opens SAT cannot necessarily create STEP; a separate translator or a different CAD application is then required.
Online conversion
CAD Exchanger Cloud can convert SAT to STEP through a web upload when local software is unavailable. Upload the SAT file, select STEP, choose AP242 or AP214 if offered and compatible with the destination, then download and inspect the result.
Do not upload confidential, export-controlled, or proprietary geometry unless the service’s retention, processing, and access terms meet the project requirements. Desktop conversion is preferable when the model cannot leave the organization.
Quality and compatibility limits
The result is usually a non-parametric solid or surface model. Feature trees, sketches, constraints, mates, construction history, and native modeling operations generally do not survive the conversion. A STEP file may remain editable at the face and feature-recognition level, but it is not equivalent to the original native CAD model.
Units require explicit checking. STEP records unit information, but an importing application can override it or interpret a damaged file incorrectly. Measure a known dimension after import and compare it with the SAT source.
SAT revisions are version-sensitive. An older translator may reject a newer file, and unsupported custom entities, invalid topology, mixed open and closed bodies, or source-model errors can produce missing geometry. If the translator reports errors, open and repair the model in the source CAD system, then resave it as an older compatible SAT revision before repeating the export.
Conversion can expose small gaps or tolerance problems that were hidden in the source application. Inspect trimmed surfaces, coincident faces, holes, fillets, thin walls, and assembly relationships in the exported file. Keep the original .sat file with the STEP output for traceability.
SAT vs STEP: format comparison
How the SAT and STEP formats compare on the properties that matter most for this conversion.
| Property | .SAT ACIS SAT (Standard ACIS Text) | .STEP Standard for the Exchange of Product model data |
|---|---|---|
| Open standard | Partly open | Yes |
| Compression | Uncompressed | Uncompressed |
| Typical file size | Medium | Medium |
| Opens in a web browser | No | No |
| Further editing | Limited | Limited |
| Metadata support | Basic | Extensive |
| Plain-text readable | Yes | Yes |
| Best used for | Data exchange | Data exchange |
| Introduced | 1989 | 1994 |
| Developer | Spatial Corporation (originally Intergraph/Spatial Technology) | ISO |
| MIME type | — | application/step |
Information about file extensions and file types is provided by File-Extensions.org
Suggested software and links: sat to step converters
Frequently asked questions
Will converting SAT to STEP keep my solid geometry intact?
Usually, the solid boundary geometry and basic model structure are transferred, but the result depends on whether the STEP exporter supports the ACIS entities in the SAT file. Small gaps, invalid faces, or unsupported geometry can cause missing or altered parts.
Will my SAT feature history and parametric dimensions be preserved in STEP?
No, SAT to STEP normally transfers the modeled shape rather than the original feature tree, sketches, constraints, or parametric history. The STEP model may still be editable as CAD geometry, but it will not generally behave like the original native design.
Why does my SAT to STEP conversion lose colors, layers, or assembly information?
Colors, layers, names, attributes, and assembly structure are preserved only when both the source data and selected STEP application protocol support them. A basic STEP export may transfer the shapes while dropping some of this organizational or display information.
Why is my STEP file empty or missing parts after converting from SAT?
This usually happens when the SAT contains invalid or unsupported ACIS entities, separate bodies that are not handled by the chosen export settings, or geometry that fails validation. Checking the source solids and choosing a STEP option suited to assemblies and product data can help.