Proton Servo (Steel Gears, 180° Rotation, Speed Ratio)


The goBILDA® Proton Servo is a standard size servo offering essential servo function on a budget. There are two versions of the Proton: ‘Torque’ and ‘Speed’. Though their gear ratios differ, they are identical in every other way. The ‘Speed’ version sacrifices torque to optimize its performance in higher speed applications. 

While makers of all levels can appreciate the steel gears that form the Proton’s core, the nucleus of the design is beginner-friendly accessibility! That’s why the Proton’s set of features has been pared-down to the bare essentials:

  • 180° of rotation to turn your ideas into reality
  • 0.08 sec/60° (125RPM)—blazing speed for projects that just can’t wait
  • an H25T spline, which you can use to mount all kinds of rotating components found throughout the goBILDA® ecosystem and the wider hobby market

Looking to make your start in robotics, or provide one for someone else? The Proton can be a fantastic first step for implementing servo solutions in novice projects without straining your wallet!






Weight 52g
Output Shaft Style 25 Tooth Spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 0.10 sec/60° (100RPM)
No-Load Speed (6.0V) 0.08 sec/60° (125RPM)
Stall Torque (4.8V) 30 oz-in (2.16
Stall Torque (6.0V) 40 oz-in (2.88
No-Load Current (4.8V) 80mA
No-Load Current (6.0V) 90mA
Stall Current (4.8V) 800mA
Stall Current (6.0V) 1,000mA
Max PWM Range 600-2400µsec
Travel per μsec 0.105°/μsec
Max Rotation 189°
Pulse Amplitude 3-5V
Deadband Width 5µsec
Motor Type Brushed DC
Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearing
Gear Material Steel
Wire Length 11.81" (300mm)
Wire Gauge 22AWG
Connector Type 3-Pos TJC8 Servo Connector [MH-FC]
Servo Size Standard
Direction with Increasing PWM Signal Clockwise

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