... internal loop and External loop;Internal loop:row 1 with turn 1,like Turn x Row:1x2,1x3,1x4, ... torque is 1/3 of slide screw;2.High precision,Low noise;3.Ensure that accurate in micro;4.No ... will cannot be heated . NOTE: Using the tool in ventilated environmental condition Accuracy C7Prepressing P0 P1 Length 0.5m ... your question.Used machine and our factory 1/2 Inch Right hand ball screw by Rongter