IGES File

What is a IGES file?

An IGES file is a neutral CAD exchange format used to transfer geometry between CAD systems. It often stores surfaces and curves and is common in legacy engineering workflows (but still supported in many tools).

Common uses

• Sharing CAD geometry between different software
• Legacy CAD data exchange
• Manufacturing handoff for surface models
• Archiving models in a neutral standard
• Importing geometry into CAM tools

How to open a IGES file

• CAD: SolidWorks, Fusion 360, FreeCAD, Creo, Inventor (varies)
• View: IGES viewers for preview
• Tip: STEP (STP) is often preferred for cleaner solid transfers

Common problems

• Surface gaps or trimmed surfaces import poorly
• Feature history is not preserved
• Units/tolerance mismatches
• Large files can be slow to open
• Different apps interpret surfaces differently

History

IGES was an early major CAD exchange standard and helped teams share geometry across vendors. While STEP is often favored today, IGES remains common in legacy pipelines and certain surface modeling handoffs.