Chinese Standard: GB/T 39011.2-2020

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

IDT  ISO 9177-2:1989

全国制笔标准化技术委员会(SAC/TC 378)

GB/T 39011的本部分规定了活动铅笔黑铅芯的分类和尺寸。
本部分适用于两种类型黑铅芯：
 --树脂铅芯（以字母“P”标志)；
 --石墨铅芯（以字母“C”标志)。

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