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Mechanical pencils — Part 3: Black leads — Bending strengths of HB leads

Mechanical pencils for technical drawings — Part 1: Classification, dimensions, performance requirements and…

Overview ISO 9177-1:2016 - "Mechanical pencils for technical drawings - Part 1: Classification, dimensions, performance requirements and testing" defines how hand‑held mechanical pencils intended for…

Mechanical pencils — Part 2: Black leads — Classification and dimensions

Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions

Overview ISO 9177-2:2022 - Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions specifies the classification, nominal diameters and standard lengths for bla…

Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads

Overview ISO 9177-3:2022 specifies bending strengths and a test method for black leads of HB hardness used in mechanical pencils for technical drawings. The standard defines minimum bending strength…