GB/T 39542.2-2025
ActiveMechanical 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 engineering, architectural, and design industries to ensure consistent lead diameters and hardness grades for precise manual drafting and technical illustration. The standard facilitates compatibility between leads and mechanical pencil mechanisms, supporting accurate line widths in professional and educational drawing contexts.
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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.