BS EN ISO 2203:1997

This standard BS EN ISO 2203:1997 Technical drawing. Conventional representation of gears is classified in these ICS categories:

• 01.100.20 Mechanical engineering drawings
• 21.200 Gears

This International Standard establishes the conventional representation of the toothed portion of gears including worm gearing and chain wheels. It is applicable to detail drawings and assembly drawings.

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 chain line.

NOTE For uniformity all figures in this International Standard are in first angle projection (Method E). It should be understood that the third angle projection (Method A) could equally well have been used without prejudice to the principles established.