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| Chinese National Standard Category: Culture, education and drawing instruments, notebooks and cards |
| English Title: | Mechanical pencils for technical drawings—Part 3:Black leads—Bending strengths of HB leads |
| Chinese Title: | 技术制图活动铅笔 第3部分：黑铅芯 HB铅芯弯曲强度 |
| Standard No.: | GB/T 39542.3-2025 |
| Category No.: | Y50 |
| Issued by: | SAMR; SAC |
| Issued on: | 2025-05-30 |
| Implemented on: | 2025-5-30 |
| Status: | valid |
| Superseded by: | |
| Superseded on: | |
| Abolished on: | |
| Superseding: | GB/T 39542.3-2020 Mechanical pencils for technical drawings—Part 3:Black leads—Bending strengths of HB leads |
| Word Count: | 7000 words |
| Similar Standards: |
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