本文件规定了手持式机械铅笔的分类、尺寸、质量和试验方法。手持式机械铅笔可容纳和送出铅条，并用于一般书写。它也适用于配有机械铅笔装置的多功能笔。但是，不包括与绘图仪等机械仪器相连的铅笔。

This document specifies classification, dimensions, quality and test methods for hand-held mechanical pencilss which hold and feed out a lead, and are used for general writing. It is also applicable to multi-function pens equipped with a mechanical pencil unit. However, those pencils attached to machinery instruments such as a plotter are excluded.