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HS-785HB Servo

  • HS-785HB included hardware
  • HS-785HB in box
  • HS-785HB side view
  • HS-785HB back view
  • HS-785HB with winch arm
  • HS-785HB (right) shown with a standard size servo
  • HS-785HB (left) shown with a standard size servo
  • HS-785HB top view
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The HS-785HB servo is unique due to its ability to rotate multiple turns while retaining positioning feedback.  While most servos are limited to approximately 180 degrees absolute max, the HS-785HB can rotate just over 8 turns given the proper PWM signal range.  With most hobby radio systems the HS-785HB servo range is likely to be just shy of 4 rotations (assuming a 1050-1950usec PWM signal) however when using the servo with a servo controller capable of sending a wider PWM range (Arduino, Raspberry Pi, Pololu Servo Controller, etc.), the servo is able to be driven further without any modifications necessary.  This large scale servo has wear resistant Karbonite gears and an output shaft supported by two ball bearings to ensure years of reliable service.  


Dimensions 2.32" x 1.14"x 1.96" (59 x 29 x 50mm)
Product Weight 3.88 oz.. (110g)
Output Shaft Style 24 tooth (C1) spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 1.68sec/360°
No-Load Speed (6.0V) 1.4sec/360°
Stall Torque (4.8V) 152.75 oz/in. (
Stall Torque (6.0V) 183 oz/in. (
Max PWM Signal Range (Standard) 600-2400μsec
Travel per µs (out of box) 1.57°
Max Travel (out of box) 2826°
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 8mA/
Current Drain - idle (6.0V) 8.7m
Current Drain - no-load (4.8V) 230mA
Current Drain - no-load (6V) 285mA
Continuous Rotation Modifiable Yes
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 8µs
Motor Type 3 Pole Ferrite
Potentiometer Drive Indirect Drive
Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearings
Gear Type Straight Cut Spur
Gear Material Karbonite
Wire Length 11.81" (300mm)
Wire Gauge 22AWG

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