worm gear screw jack,worm drive screw jack has 11 models JTC2.5, JTC5, JTC10, JTC25, JTC50, JTC100, JTC150, JTC200, JTC250, JTC350, JTC500. Load capacity 2.5 kN, 5 kN, 10 kN, 25 kN, 50 kN, 100 kN, 150 kN, 200 kN, 250 kN, 350 kN, 500 kN. Lift screw diameter from 16 mm to 120 mm, pitch from 4 mm to 14 mm. Worm gear ratios from 1/5 to 1/56, custom other gear reduction ratio. Upright translating screw, inverted translating screw, upright keyed translating screw, inverted keyed translating screw, upright travelling nut rotating screw, inverted travelling nut rotating screw configurations. Top plate, clevis end, threaded end, plain end end fittings are suitable, also custom the end fittings. Precision positioning, self locking which supports the loads and hold position with no need to employ brake mechanism or other locking systems. Manual operation by hand wheel or hand crank, electric driven by single phase or three phases electric motor, gear motor, sometimes by dc motor. No stock and no fixed price for kinds of jacks, because we produce jacks following customers requirements like different stroke, travel speed, input worm types and accessories. Single unit or multiple units screw jack system arrangements are available.