Extract text from FEA data files (NAS)
To convert NAS data files to another format, you need MSC Nastran or other Data software.
To convert other file formats to the "Scientific Data & FEA Input" file type, you need software like MSC Nastran or a similar tool.
A .NAS file primarily serves one of two distinct technical purposes: it is either a plain text NASA-Ames format file used for exchanging atmospheric monitoring data, or a Finite Element Analysis (FEA) input model used by the MSC Nastran solver. The NASA-Ames format relies on a strict, standardized ASCII structure to record air quality metrics and environmental readings. Conversely, Nastran .NAS files contain 'bulk data decks' - massive text arrays defining 3D nodes, elements (like CQUAD and CTRIA), and material properties for structural engineering simulations. Rarely, .NAS extensions are also used for CAD/BIM assistant files by Nemetschek Allplan or as renamed PNG files by NACHA RemitRight.
The main disadvantage of .NAS files is their severe lack of accessibility. NASA-Ames data files feature rigid, multi-line headers; a single missing space or incorrect line count will completely break most automated parsers. Nastran .NAS files, while technically human-readable text, are incomprehensible without $10,000+ enterprise software like MSC Nastran or Femap to render the actual 3D geometry. Sharing either format with non-specialists is practically impossible without prior conversion.
To make this data usable, conversion is mandatory. For atmospheric data analysis, convert NASA-Ames .NAS to CSV or XLSX so it can be ingested by standard spreadsheet software or Python data pipelines. For engineering teams needing to share Nastran meshes, convert the text data into standard 3D formats like STEP, IGES, or 3D PDF reports. Drop your file here to analyze and convert it - free, online, and without installing software.
Convert.Guru analyzes your NAS file, detects the exact format, and lets you read the text inside.
Users also converted XML, TOC, PDT, PTC, DAS and SSD files.
If you want to convert NAS file to DAS, SSD, CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF or DAT, you can use MSC Nastran or similar software from the "Atmospheric Data & FEA Models" category. In the File menu, look for Save As… or Export….
To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to NAS, try MSC Nastran or another comparable tool in the "Atmospheric Data & FEA Models" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our NAS converter.