Device for measuring diameter of hexagonal head bolt

The utility model discloses a device for measuring the diameter of a hexagon-headed bolt, and the device comprises a fixed seat, a moving part which is used for measuring the diameter of a bolt, and an auxiliary part. The bolt diameter measuring device comprises a fixed seat, a movable part and a movable part, the movable part comprises a supporting plate arranged above the fixed seat, a fixed rod arranged on the lower portion of the supporting plate, a sliding groove formed in the fixed rod and a supporting block arranged in the fixed rod, and by arranging the fixed seat, the supporting plate, the fixed rod, the sliding groove and the supporting block, the problem that when an existing bolt diameter measuring device is used, the bolt diameter cannot be measured easily is solved. The problems that in the prior art, a customizing party needs bolts of different sizes, the bolts of different sizes cannot be clamped and fixed, the diameters of the bolts cannot be effectively measured, the measurement work of work