Vernier caliper for measuring position dimension of fuse hole of hexagon nut

The utility model belongs to the technical field of measuring tools, and discloses a vernier caliper for measuring the position dimension of a fuse hole of a hexagon nut. The needle-type measuring head extends into the fuse hole and is in gapless fit with the inner wall of the fuse hole, so that the direction of the measuring head of the vernier caliper is parallel to the direction of the fuse hole, and the measuring result is more accurate. The device is simple in structure, convenient and fast to use, high in measurement efficiency, and suitable for detecting the position dimensions of fuse holes with various diameters. 本实用新型属于测量工具技术领域，公开了一种测量六角螺母保险丝孔位置尺寸的游标卡尺。通过采用针式测量头伸入保险丝孔与其内壁无间隙贴合的测量方式，保证游标卡尺测量头方向与保险丝孔方向平行，使得测量结果更加准确。本实用新型结构简单，使用方便快捷，测量效率高，适用多种直径保险丝孔位置尺寸的检测。