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HS-85BB Servo

  • HS-85BB top view
  • HS-85BB with quarter for scale
  • HS-85BB side view
  • HS-85BB included hardware
  • HS-85BB back view
  • HS-85BB in box
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The HS-85BB features a high power motor for greater speed and torque. The HS-85BB is the choice of modelers looking for a high performance servo without breaking the bank. The ball bearing supported output shaft and sturdy gear trains are preferred for smaller glow and electric airplanes, helis and sail planes.


Dimensions 1.14" x 0.51"x 1.18" (29 x 13 x 30mm)
Product Weight 0.67oz (19.2g)
Output Shaft Style 24 tooth (C1) spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 0.16sec/60°
No-Load Speed (6.0V) 0.14sec/60°
Stall Torque (4.8V) 41.66 oz/in. (
Stall Torque (6.0V) 48.6 oz/in. (
Max PWM Signal Range (Standard) 553-2300μsec
Travel per µs (out of box) .104°/μsec
Max Travel (out of box) 182.5°
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 8mA
Current Drain - idle (6.0V) 8.6mA
Current Drain - no-load (4.8V) 240mA
Current Drain - no-load (6V) 260mA
Continuous Rotation Modifiable No
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 8µs
Motor Type 3 Pole Ferrite
Potentiometer Drive Direct Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Top Ball Bearing
Gear Type Straight Cut Spur
Gear Material Nylon
Wire Length 6.29" (160mm)
Wire Gauge 28AWG

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