Screw hole length measuring go and nogo gauge

The utility model discloses a screw hole length measuring go and no go gauge, which is disposed thereon with a screw go gauge and a screw no go gauge and comprises a reading sleeve, reading characters, a sleeve, an adjusting round nut and a spring. The utility model can detect the go and no go characteristics of the screw hole and at the same time, the utility model can measure the depth of the screw hole with the advantages of simple structure, convenient operation and high work efficiency. In addition, the utility model is characterized in that: the go gauge, the no go gauge, the reading sleeve, an optical axis and a screw round nut are arranged at the same axes line; the reading sleeve having the outer diameter provided with reading figures is nested in the inner hole of the sleeve and moves along the axial direction therein; the depth the no go gauge screwed into the screw hole is the reading figures on the reading sleeve indicated by the sleeve port.