... .6~36V No load Speed 2000~25000r.p.m Output:5~75W DC motors models RS-540 ... length 50 mm; shaft 3.175 mm, fixing screw 2-M3.0 mm. Operating voltage: 3.6~60V ... no load Speed 2,000~25,000 r.p.m, Output about 3~75W. fit for power tools, ... haircut apparatus, printer, air pump, vending machine, blender, , drill & screw driver, forest tools, etc.ModelVoltageNo LoadAt Max. EfficiencyStall TorqueOperating Range ...