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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 43550.2-2023 |
Mechanical pencils and lead for general use - Classification, dimensions, quality and test methods - Part 2: Black lead {译} 一般用途活动铅笔和铅芯 分类、尺寸、质量和试验方法 第2部分：黑铅芯 |
China National Standards Mechanical pencils lead |
 English PDF |
| GB/T 43550.1-2023 |
Mechanical pencils and lead for general use - Classification, dimensions, quality and test methods - Part 1: Mechanical pencils {译} 一般用途活动铅笔和铅芯 分类、尺寸、质量和试验方法 第1部分：活动铅笔 |
China National Standards Mechanical pencils lead |
English PDF |
| GB/T 39542.2-2020 |
Mechanical 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 |
China National Standards Mechanical pencils lead |
English PDF |
| GB/T 39542.3-2020 |
Mechanical pencils for technical drawings—Part 3: Black leads—Bending strengths of HB leads 技术制图活动铅笔 第3部分：黑铅芯 HB铅芯弯曲强度 |
China National Standards Mechanical pencils lead |
English PDF |
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