ISO 2203:1973 Preview
Technical drawings -- Conventional representation of gears
This standard was last reviewed and confirmed* in 2014.
*Therefore this version remains current
Establishes how to draw the toothed portion of gears including worm gearing and chain wheels. Applicable to detail drawings (individual gears) and assembly drawings (gear pairs). As a fundamental principle a gear is represented (except in axial section) as a solid part without teeth, but with the addition of the pitch surface in a thin long dash-and-dot line. For uniformity all figures are in first angle projection.