Jt 3 t jack lifting,3 ton mechanical lifter,30kn mechanical jack,3tonnes mechanical screw jack,3000kg screw jacks with trapezoid,6000lb jack screw lift,12 inch screw jack static lifting force 3000 kg, dynamic lifting force 2000 kg. lifting screw (spindle) Tr32x6. high speed gear ratio 1/6, medium speed gear ratio 1/12, low speed gear ratio 1/24. 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 and top plate (flange type) for lead screw (spindle) end types. customized various length stroke, when maximum compression load, 250 mm stroke without guidances, 500 mm stroke with guidances. when tension load, 1500 mm stroke. single screw jack or multiple screw jacks system arrangements.