GPLEF64 – Flange gearboxes Description Technical data Flange gearboxes for NEMA 23 (56 mm) and NEMA 24 (60 mm) motors. Available in various lengths and reductions. Reduction Ratio 5 - 25 Rated Output Torque 15 Nm - 40 Nm Efficiency 95 % - 97 % Max. Backlash 10 ´(arc minutes) - 12 ´(arc minutes)