technical parameter ZLJ-200 ZLJ-250 ZLJ-350 ZLJ-400 ZLJ-700 Rated output torque of vertical shaft (N ˙ m) 200 250 350 400 700 Use the drill rod (mm) φ42 42 42 φ42 φ42 drilling depth （ m） 50 75 150 200 250 borehole diameter trompil (mm) φ89 φ89 φ89
