ISO 9177-3:2022

International Standard   Current Edition · Approved on 26 January 2022

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

ISO 9177-3:2022 Files

English 4 Pages
Current Edition
BHD 20.42

ISO 9177-3:2022 Scope

This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.

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