ISO 2306:1972 螺纹底径钻头

标准编号：ISO 2306:1972

中文名称：螺纹底径钻头

英文名称：Drills for use prior to tapping screw threads

发布日期：1972-07

标准范围

指定ISO公制螺纹的这些钻头的尺寸（表1和表2）。ISO英制螺纹（表3和表4）和管螺纹（表5和表6）。适用于正常啮合长度的螺纹，钻孔直径约等于螺纹的公称直径减去螺距。尺寸（星号指示的尺寸除外）已从ISO 235中选择，将在将来使用。

Specifies the sizes of these drills for ISO metric threads (tables 1 and 2). ISO inch threads (tables 3 and 4) and pipe threads (tables 5 and 6). Applies to screw threads of normal length of engagement, the drill diamter being approximately equal to the nominal diameter of the thread minus the pitch. The sizes (except for those sizes indicated by an asterisk) have been selected from ISO 235 and are to be used in the future.

标准预览图