HSR-2645CR Continuous Rotataion for Servo for Robot & Industrial Use. 72 rpm, 12kg/cm-7.4V 40.6x19.8x37.8mm, 53g

Control System: +Pulse Width Control 1500usec Neutral Required Pulse: 3-5 Volt Peak to Peak Square Wave Operating Voltage Range: 4.8-7.4 Volts Operating Temperature Range: -20 to +60 Degree C (-4F to +140F) Operating Speed (4.8V): 46 RPM at no load Operating Speed (6.0V): 58 RPM at no load Operating Speed (7.4V): 72 RPM at no load Operating Torque (4.8V): 111.09 oz-in (8 kg-cm) Operating Torque (6.0V): 138.87 oz-in (10 kg-cm) Operating Torque (7.4V): 166.64 oz-in (12 kg-cm) Continuous Rotation Modifiable: Completed (Stock) Direction: Clockwise/Pulse Traveling 1500 to 1900usec Motor Type: Carbon Brushed Cored Motor Potentiometer Drive: No Potentiometer Bearing Type: Dual Ball Bearings Gear Type: Metal Gears Dimensions: 1.59" x 0.77"x 1.48" (40.6 x 19.8 x 37.8mm) Weight: 1.87oz (53g)