... Helical speed reducer, gearbox, gear reducer, gear unit Reduction ratio: 1:3.21~1:289.74 Output torque: 50~18000N.m MD series helical gearbox, speed reducer, gear reducer, gear ... unitReduction ratio: 1:3.21~1:289.74 Output torque: 50~18000N.m Motor power range: 0.12~160KwMD series ... of related transmission equipment. Helical speed reducer