ISO 9177-2:2022

Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions ISO 9177-2:2022

Publication date:   Jun 1, 2022

Scope

This document specifies a classification and dimensions for black leads used for mechanical pencils for technical drawings.
Two types of black leads are available:
—    polymer leads (designated by the letter “P”);
—    ceramic leads (designated by the letter “C”).