TD8120MG 20KG 180 Degree Digital Servo

The 8120 is a heavy-duty digital servo built for projects that need serious holding power in a standard servo footprint. With a full metal gear train, dual ball bearings and a CNC aluminum center case, it’s engineered to handle repeated high-load cycles without the gear stripping or wobble that plague cheaper plastic-gear servos, and the IP66-rated waterproof housing means it shrugs off dust, splashes and rain rather than sitting on the shelf as an indoor-only part. This 180 degree version delivers stall torque of roughly 21 kg·cm at 5V, climbing to about 23.5 kg·cm at 6.8V, giving it a meaningful torque advantage over the standard DS3218 for the same footprint and mounting pattern. It responds quickly, moving 60 degrees in roughly 0.14 to 0.16 seconds depending on supply voltage, and accepts a standard 500 to 2500 microsecond PWM signal, so it drops straight into existing RC receivers, servo controllers, Arduino and Raspberry Pi projects without any special driver hardware. The 25T spline fits common aftermarket horns and arms for easy mounting and upgrades. Builders reach for this servo in combat robotics lifters and clamps, robot arms, RC car and boat steering, camera gimbals, and any DIY mechanism that needs strong, accurate, repeatable positioning rather than continuous rotation.

Specification:

• Model : TD-8120MG
• Rotation Angle : 180°
• Stall Torque : 21 kg.cm @5V, 23.5 kg.cm @6.8V
• Operating Voltage : 4.8V – 6.8V
• Speed : 0.16 sec/60° @5V, 0.14 sec/60° @6.8V
• Gear Type : Full Metal Gear
• Bearing : Dual Ball Bearing
• Control Signal : PWM, 500-2500 µs
• Spline Type : 25T
• Weight : 60g
• Dimensions : 40 x 20 x 40.5 mm