Jtc200 worm gear screw lifter,20000kg rotating screw jack,20ton travelling nut screw jack,20 t 4 ft worm gear lift jack,200 kn worm screw lift assembly,20 tonnes cubical gearbox screw jack static load capacity 200 kn, high speed torque 146 n.m, low speed torque 48 n.m. lead screw (spindle) Tr70x10. high speed gear ratio 1/10, low speed gear ratio 1/40. upright or inverted translating screw, rotating screw and keyed screw configurations. precision positioning, self locking lead screw which support the loads and hold position without brake mechamism. hand wheel or hand crank manual operation, or single phase or three phases electric motor driven, gear motor driven or dc 24v gear reduction motor drives. thread end, clevis end, plain end, forked head and top plate (flange type) for lead screw (spindle) end types. customized various length stroke, under tension load, maximum 3000 mm stroke. single screw jack or multiple screw jacks system arrangements.