Standard No.:	GB/T 39542.2-2025
English Name:	Mechanical pencils for technical drawings—Part 2:Black leads—Classification and dimensions
Chinese Name:	技术制图活动铅笔 第2部分：黑铅芯 分类和尺寸
Chinese Classification:	Y50    Culture, education and drawing instruments, notebooks and cards
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-05-30
Implemented on:	2025-5-30
Status:	valid
Superseding:	GB/T 39542.2-2020 Mechanical pencils for technical drawings—Part 2:Black leads—Classification and dimensions
Target Language:	English
File Format:	PDF
Word Count:	7000 words
Translation Price(USD):	210.0
Delivery:	via email in 1~3 business day

本文件规定了技术制图活动铅笔黑铅芯的分类和尺寸。
本文件适用于两种类型黑铅芯：
――树脂铅芯（以字母“P”标志)；
――黏土铅芯（以字母“C”标志)。