Jacton Electromechanical Co.,Ltd produces screw jack lift systems for heavy loads of up to hundreds of tons. Their screw jack systems feature precision positioning, synchronous lifting, easy control and maintenance-free operation. Screw jack lift systems use components like bevel gearboxes, screw jacks, flexible couplings and shafts. Systems with two jacks in an I or T layout have 95% efficiency, while systems with three or four jacks in T, U or H layouts have 90% and 85% efficiency respectively.