Jt 0.5 t travelling nut screw jack shaft, 0.5 ton jack screw length,500 kg synchronized screw jack,5kn screw jack roller bearings,1000lb screw jack housing casting static lifting force 500 kg, dynamic lifting force 300 kg. lifting screw (spindle) Tr20x5. high speed gear ratio 1/5, medium speed gear ratio 1/10, low speed gear ratio 1/20. 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, 100 mm stroke without guidances, 200 mm stroke with guidances. when tension load, 700 mm stroke. single screw jack or multiple screw jacks system arrangements.