SLDPRT

SLDPRT is the filename extension used by Dassault Systèmes SolidWorks for a part document. A SLDPRT file represents a single 3D part created within SolidWorks and contains its parametric geometry, including sketches, features, and their history, as well as metadata such as material properties, appearances, and configurations.

Parts are designed to function within assemblies, which use the corresponding assembly files with the .sldasm extension. The part file can store multiple configurations, enabling alternative geometries or dimensions within the same document without creating separate files. This supports design variation, option studies, and feature-level editing while preserving a consistent part model.

SLDPRT files are created and edited in SolidWorks, a parametric CAD program. The format is proprietary and tightly integrated with the SolidWorks feature history and parametric modeling workflow. While SolidWorks can read and write SLDPRT files, interoperability with other CAD systems typically relies on exporting or importing neutral formats rather than directly editing a .sldprt file. Common interchange formats include STEP, IGES, and STL, and Parasolid-based exports may be used for compatibility with other CAD tools.

In practice, SLDPRT files are widely used in mechanical engineering, product design, and manufacturing to capture detailed 3D part geometry, associated material properties, finishes, and configurations. They form a core element of SolidWorks’ ecosystem, enabling integrated design, simulation, and documentation workflows.