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HS-81 Servo

  • HS-81 with quarter for scale
  • HS-81 top view
  • HS-81 back view
  • HS-81 in box
  • HS-81 included hardware
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You get two choices with Hitec’s most popular servo the HS-81, resin or metal gears. A popular servo for smaller airplanes, heli’s, boats, cars and trucks, the HS-81 offers a fine balance between speed and torque.


Dimensions 1.17" x 0.47"x 1.16" (29.8 x 12 x 29.6mm)
Product Weight 0.58oz (16.6g)
Output Shaft Style 24 tooth (C1) spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 0.11sec/60°
No-Load Speed (6.0V) 0.09sec/60°
Stall Torque (4.8V) 36.10 oz/in. (
Stall Torque (6.0V) 41.66 oz/in. (
Max PWM Signal Range (Standard) 640-2250μsec
Travel per µs (out of box) .102°/μsec
Max Travel (out of box) 165°
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 8.8mA
Current Drain - idle (6.0V) 9.1mA
Current Drain - no-load (4.8V) 220mA
Current Drain - no-load (6V) 280mA
Continuous Rotation Modifiable No
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 8µs
Motor Type 3 Pole Ferrite Motor
Potentiometer Drive Direct Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Outer case serves as bearing
Gear Type Straight Cut Spur
Gear Material Nylon
Wire Length 6.29" (160mm)
Wire Gauge 28AWG

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