莫氏锥柄和直柄空心钻

[中文适用范围]： 本标准规定了直柄和莫氏锥柄空心钻的尺寸。本标准针对上述每种类型都提供了两个表格，分别列出：优选直径的尺寸（参见表1和表2）以及根据直径范围定义的相应长度（参见表3和表4）。表格中仅显示公制尺寸，未来此类钻头将仅推荐使用公制尺寸。除非另有说明，否则这些钻头均为右旋切削钻头。 [外文原描述]： ISO 7079:2016 specifies the dimensions of core drills with parallel shanks and with Morse taper shanks. It includes two tables for each of the above specified types, giving respectively - the dimensions for the preferred diameter (see Tables 1 and 2), and - the corresponding lengths defined in terms of diameter ranges (see Tables 3 and 4). The tables show only metric dimensions which are alone recommended in the future for this type of drill. Unless otherwise stated, these drills will be right-hand cutting drills.