ISO 9177-3:2022
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads

Standard No.

ISO 9177-3:2022

Release Date

2022

Published By

International Organization for Standardization (ISO)

Latest

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.

ISO 9177-3:2022 history

• 2022 ISO 9177-3:2022 Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
• 1994 ISO 9177-3:1994 Mechanical pencils - Part 3: Black leads - Bending strengths of HB leads