Reference number
ISO 9177-2:2022
ISO 9177-2:2022
© ISO 2025
International Standard
ISO 9177-2:2022
Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions
Edition 2
2022-06
2022-06
Abstract
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”).
Life cycle
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Previously
WithdrawnISO 9177-2:1989
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Now