标准摘要
[中文适用范围]： 本文件规定了用于技术制图的自动铅笔的黑色铅芯的分类和尺寸。有两种类型的黑色铅芯： — 聚合物铅芯（用字母“P”表示）； — 陶瓷铅芯（用字母“C”表示）。 [外文原描述]： This document specifies a classification and dimensions for black leads used for mechanical pencils for technical drawings. Two types of black leads are available: — polymer leads (designated by the letter “P”); — ceramic leads (designated by the letter “C”).
英文名称Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions