STEP

File Format
Name	STEP
Ontology	Electronic File Formats 3D and CAD/CAM Models STEP
Extension(s)	.step, .stp, .p21
PRONOM	fmt/698
Wikidata ID	Q3509055
Released	1994

STEP (Standard for the Exchange of Product model data; ISO 10303-21) is a standardized format for 3D objects used in CAD/CAM. It is a text based format.

Identification

Files begin with the ASCII characters ISO-10303-21;.

Specs

• ANSI ISO-10303-21 (paywalled)

Software

• Free viewer
• STEP file viewers

Programming libraries

• STEPcode

Online tools

• Online viewer

Sample files

• A sample is here
• More samples are here (ZIP file)

Links

• Wikipedia article