GPLL22 – Economy planetary gearboxes Description Technical data Gearboxes in various lengths and reductions for ST2018 and ST2818 stepper motors. Reduction Ratio 4.66 - 89.72 Rated Output Torque 0.2 Nm - 0.4 Nm Efficiency 60 % - 80 % Max. Backlash 150 ´(arc minutes)