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Hitec HS-75BB
Low Profile

Hitec HS-75BB

Compatible Hardware

*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-22
Identity
Brand Hitec
Product Number 31075S
Category Hobby
Performance
Torque
6.0V 114.00 oz-in
4.8V 92.00 oz-in Below Average
Speed
6.0V 0.34 sec/60°
4.8V 0.45 sec/60° Bottom 10%
Running Current
6.0V 0.150 A
4.8V 0.150 A Above Average
Stall Current ≤1 ATop 10%
Physical
Weight 1.23 ozAverage
Dimensions L 1.73 in
W 0.90 in
H 0.98 in
Case Material Plastic
Drivetrain
Motor Type 3-pole
Gears Nylon
Gear Spline/Teeth 24 T estimate
Rotation Mode Positional
Rotation/Support Single Bearing
Control & Signal
Modulation Analog
Direction Clockwise
Rotational Range 180°
Mechanical Limit 180°
Pulse Cycle 20 ms
Pulse Width 1400-1600 µs
Neutral Position 1500 µs
Dead Band 20 µs
Angle Sensor Potentiometer
Control System PWM
Programmable No
Signal Voltage 3-5V
Electrical & Environment
Operating Voltage 4.8–6 V
Power Source Direct
Regulator Type Direct
Temperature -20–60 °C
Water Rating IP54
Idle Current 0.001 A
Connectivity
Connector JR (Universal)
Wire Length 300 mm

Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.

Class Comparison

TorqueBelow Average
Stronger than 16% of 216 Low Profile servos at 4.8V
SpeedBottom 10%
Faster than 3% of 214 Low Profile servos at 4.8V
WeightAverage
Lighter than 43% of 52 Analog Low Profile servos
Running CurrentAbove Average
Lower draw than 79% of 30 Low Profile servos at 4.8V
Stall CurrentTop 10%
Lower draw than 94% of 88 Low Profile servos

Performance Analysis

Shaft Power 0.38–0.62 W
Power Density0.406 W/in³
More power-dense than 37% of 52 Analog Low Profile servos
Torque Density2.6361 oz-in/g
Stronger than 75% of 133 Hitec servos
Torque-to-Volume Ratio60.29 oz-in/in³
Denser torque than 51% of 133 Hitec servos
Speed-to-Weight0.06367 (1/sec·g)
Faster than 17% of 131 Hitec servos
Speed-Torque Trade-off41.41
Better balanced than 76% of 131 Hitec servos
Current-per-Torque Ratio0.0109 A/oz-in
More efficient than 94% of 81 Hitec servos
Idle-to-Running Current Ratio0.007
4th-highest idle-to-running current ratio of 61 Hitec servos
No-Load vs Stall Current Spread6.67
Narrower current spread than 53% of 56 Hitec servos
Torque Gain per Volt19.93%/V
More voltage-responsive (torque) than 60% of 125 Hitec servos
Speed Gain per Volt27.01%/V
More voltage-responsive (speed) than 94% of 123 Hitec servos
Voltage Range Width1.2 V
Wider voltage range than 71% of 25 Analog Low Profile servos
Dead-Band-to-Pulse-Width Ratio0.1000
Finer dead band than 0% of 125 Hitec servos

Notes

This servo is not positional but moves slowly from one end of the operating range to the other without interruption.

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Reviews (6)

  • speed2004

    February 12, 2026

    Application(s): retracts

    Comments: Price in 2026 is now 34.95

  • Roger507

    September 24, 2017

    Application(s): 46 airplane retract servo

    Comments: I have had 4 of them and all have failed. Smoke burned an d just short out. Junk

  • Austin

    August 17, 2017

    Application(s): tc3

    Comments: Doesn't fit in my tc3 chassis and when I plug it in it doesn't even work

  • Giorgio

    June 17, 2017

    Application(s): retracts

    Comments: Works very well with 4 elements battery , but with 5 elements (more than 6 volts) doesn't work at all.

  • Conquest

    December 7, 2015

    Application(s): Classic Pattern Airplane

    Comments: Use this servo for my main MK retracts in my Classic Pattern Plane. Flawless. Never had a failure. Set them up properly and they will serve you well. Remember, these servos run 180 degrees and stop. Gear is up or gear is down, nothing in between.

  • Rafas

    August 14, 2014

    Application(s): The retractable gear P47 / thunderbolt hangar 9 .60

    Comments: Bad experience, just run a flight, US $ 30 down the drain

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