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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”).

ISO 9177-2:2022
2022 06 01
Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions
Norm
ISO 9177-2:1989
1989 03 16
Mechanical pencils — Part 2: Black leads — Classification and dimensions
Norm