ISO 9177-3:2022
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
Referenced standards
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ISO 9177-3:2022
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.
| Edition | 2022 |
|---|---|
| Standard Part No | 3 |
| Published Date | 2022 |
| Published By | International Standardization Organisation |
| Page Count | 4 |