标准摘要
[中文适用范围]： 指定七个标称尺寸的尺寸。 第三版取消并取代了第二版（1985 年），第二版进行了技术修订（增加了圆钻钢并扩大了尺寸范围）。 [外文原描述]： Specifies the dimensions for seven nominal sizes. This third edition cancels and replaces the second edition (1985), which has been technically revised (addition of round drill steels and extension of the range of sizes).
英文名称Rock drilling equipment — Hollow drill steels in bar form, hexagonal and round