Process units of turning external screw thread

The utility model provides a process units of turning external screw thread, its characteristics are formed including preceding top, dabber, taper sleeve, key, nut, tail top, and preceding apical front end be the cylinder, is equipped with the apical pore at the both ends of dabber, and seven taper sleeves through the key -type connection are established at the spindle in the other top of the point part on preceding top and tail top in the apical pore at dabber both ends, and two parts will being processed through the nut on every taper sleeve are with the stressed joint. The utility model discloses can implement the processing of accurate uniformity to a plurality of hole height and the less part of excircle height simultaneously, have easy operation, processing part size uniformity height and the high advantage of production efficiency.