ISO 9177-2:2022
International Standard
Current Edition
·
Approved on
01 June 2022
Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions
ISO 9177-2:2022 Files
English
4 Pages
Current Edition
OMR
21.83
ISO 9177-2:2022 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”).
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