GB/T 39542.2-2020
AbolishedMechanical pencils for technical drawings—Part 2: Black leads—Classification and dimensions
技术制图活动铅笔 第2部分：黑铅芯 分类和尺寸
Application Summary AI generated
This standard specifies the classification and dimensional requirements for black leads used in mechanical pencils for technical drawings. It is applied in the manufacturing and quality control of drafting supplies, ensuring compatibility between leads and mechanical pencil mechanisms for precise line widths in engineering, architectural, and design drawings.
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Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.