IGS File

IGES CAD Exchange (.igs / .iges)

What is a IGS file?

An IGS file (IGES) is a neutral CAD exchange format used to move 2D/3D geometry between different CAD systems. It often stores surfaces, curves, and solids, but typically loses feature history from the original model.

Common uses

Sharing CAD geometry between different software vendors
Manufacturing handoff (machining, quoting, inspection)
Importing legacy CAD data
Archiving models in a neutral standard
Moving surface models between tools

How to open a IGS file

CAD: Many CAD apps import IGES (SolidWorks, Fusion 360, FreeCAD, etc.)
View: IGES viewers exist for quick previews
Tip: If you have a choice, STEP (STP) often transfers solids more cleanly

Common problems

Surfaces import with gaps or bad trims
Feature history is not preserved
Units/tolerances differ after import
Large models open slowly
Different CAD apps interpret edges differently

History

IGES was one of the early widely adopted CAD exchange standards, helping teams share geometry long before modern cloud collaboration. It’s still used, especially for legacy workflows, though STEP is often preferred for many modern exchanges.