Drilling hole, tapping and locking-screw three purpose pneumatic screwdriver

The utility model relates to a drilling hole and tapping and locking-screw three-purpose pneumatic screwdriver. The utility model is a tool which is designed by integrating the functions and the purposes of a drill hole, a tapping tooth and a locking screw into a whole. The utility model is characterized in that the three-purpose pneumatic screwdriver has the transmission mode of utilizing an inner gear group as a passive piece, when the torsion force reaches and positions, a steel ball and a cam which matches with the inner gear group can jump up and down. The function and the effect of the utility model are the same with that of a clutch, the size of the control torque force can be adjusted by additionally matching with a torsion spring and a torsion force adjusting ring, and the function of operating the screwdriver in a pneumatic way is achieved. The structure of a group of clutches can be omitted by the design, the total length of the tool can be shortened, and the weight is lightened. The screwdriver is convenient and practical novel creation.