The Tower Pro SG90 9g mini servo motor is the most commonly used in RC applications. The servo motors are used for control applications which require precision control like robot arm positioning, and tool position in machining equipment.
The servo motors usually provide control over 180° range. This angular position control is performed by the PWM technique so by varying its duty cycle you can control the angular position of the motor.
This servo motor can lift a maximum of 1.6 kg when suspended at 1cm distance from the shaft. It can also be used in robotic arm, CNC machine, Steering systems on RC cars and other robotic or automation applications as well.