GB/T 39542.2-2020
Mechanical pencils for technical drawings—Part 2:Black leads—Classification and dimensions

Standard No.

GB/T 39542.2-2020

Language

Chinese

Release Date

2020

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Lastest

GB/T 39542.2-2020

Scope

This part of GB/T 39542 specifies the classification and size of mechanical pencil black lead. This section applies to two types of black lead cores: ---resin lead core (marked by the letter "P"); - graphite lead core (marked by the letter "C").

GB/T 39542.2-2020 Referenced Document

• ISO 128 Technical drawings; General principles of presentation
• ISO 9177-1 Mechanical pencils for technical drawings - Part 1: Classification, dimensions, performance requirements and testing

GB/T 39542.2-2020 history

• 2020 GB/T 39542.2-2020 Mechanical pencils for technical drawings—Part 2:Black leads—Classification and dimensions

GB/T 39542.2-2020 -All Parts