Each motor briefly described below is a quality product with hardened drive shaft, sintered bearings and quality commutator brushes etc. They are ideal for any application where a compact high torque and reliable motor is required. NO LOAD Speed (RPM): 13500 Current (AMP): 0.55 AT STALL Torque (G.CM): 191 Current (AMP): 5.6 AT MAX EFFICIENCY Efficiency(%): 49.6 Power (W): 5.96 Speed (RPM): 9679 Torque (G.CM):60 Current (AMP): 2 AT MAX POWER Output (W): 6.44 Speed (RPM): 7845 Torque (G.CM): 80 Current (AMP): 2.6 DIMENSIONS Diameter: 27.6mm Total Length: 51mm Shaft Length: 12.5mm Shaft dia: 2.3mm Mounting thread dia: 2.6mm