Here is a simple, low-cost, high quality servo for all your mechatronic needs.
This servo is very similar in size and specifications to the Hitec HS-55.
This little guy is able to take in 6 volts and deliver 20.8 oz-in. of maximum torque at 0.10 sec/60°
This small servo comes with a standard 3 pin power and control cable, and all hardware listed below.
Note: This servo is rated for 180° rotation, but in actuality it only hits ~160°.
1x Micro Size Servo
1x Single Arm Micro Horn
1x Double Arm Micro Horn
1x Four Point Micro Horn
1x Circle Micro Horn
3x Phillips Screw
Voltage: 4.8-6.0 Volts
Torque: 16.6/20.8 oz-in. (4.8/6.0V)
Speed: 0.15/0.10 sec/60° (4.8/6.0V)
Single Top Ball Bearing
3-Pole Ferrite Motor
Dimensions: 31.8 x 11.7 x 29mm
Wire Length: 160mm