Here is a powerful, low-cost, reliable servo for all your mechatronic needs.
This servo is able to take in 6 volts and deliver 83.47 oz-in. of maximum torque at 0.16 sec/60°

This is a tough little servo with a standard 3 pin power and control cable, and all hardware listed below.

Features:

• Voltage: 4.8-6.0 Volts
• Torque: 69.56/83.47 oz-in. (4.8/6.0V)
• Speed: 0.18/0.16 sec/60° (4.8/6.0V)
• Direction: Counterclockwise 1000-2000usec
• Rotation: 180°
• Dual Ball Bearing
• Nylon Gears
• 25T Spline

Includes:

• 1x FS5106B High Torque Servo
• 1x Double Arm Horn
• 1x Circle Horn
• 1x Four Point Horn
• 1x Six Point Horn
• 2x 3x10mm Phillips Screw
• 4x 2x13mm Mounting Phillips Screw
• 4x Rubber Grommets
• 4x Brass Eyelets

Dimensions:

• 40.8 x 20.1 x 38mm
• Wire Length: 300mm
• Weight: 40g

Documents:

• Datasheet