... type screw jack can be directly connected with electric motor,or gear reducer. electric screw lifts Detailed Informations:For easy installation, Every ... mounts come with necessary hardware and coupling keys. All standard electric motors are 3 phase, 380VAC, 50 Hz, 1440 rpm. Special ... ratioT :travel stroke per revolutionExample, 4 poles(1500 rpm) electric motor,jacks model RN-0.5T-1/5(1 turn 1 mm ...