Return screw thread frock

The utility model discloses a return screw thread frock, including the horizontal plate, locate and be used for the fixed arrangement portion that waits to process the work piece on the horizontal plate, can reciprocate the shift unit of locating on the horizontal plate, be equipped with one on the shift unit and can treat the screw tap that the processing work piece carries out thread processing, settle troops under one's command side to be equipped with a motor, this motor includes the pivot of wearing out arrangement portion, this pivot has the end that can cooperate and drive the screw tap rotation with the screw tap. The utility model has the advantages of it is with low costs, convenient operation, product percent of pass and work efficiency are high.