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Technical Specifications
Last Updated: 2026-09-13Identity
Performance
Physical
Drivetrain
Control & Signal
Electrical & Environment
Connectivity
Origin
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| Identity | |
| Brand |  |
| Product Number | 31081S |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
42.00 oz-in
3.02 kg-cm
0.3 N-m
4.8V
36.00 oz-in
2.59 kg-cm
0.3 N-m
|
| Speed |
6.0V
0.09 sec/60°
666.7 deg/s
111.1 RPM
4.8V
0.11 sec/60°
545.5 deg/s
90.9 RPM
|
| Running Current |
6.0V
0.280 A
280 mA
4.8V
0.220 A
220 mA
|
| Stall Current | ≤1.5 A≤1500 mA |
| Physical | |
| Weight | 0.59 oz16.6 g |
| Dimensions |
L 1.17 in W 0.47 in H 1.16 in L 29.7 mm W 11.9 mm H 29.5 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | 3-pole |
| Motor Drive | (add) |
| Gears | Nylon |
| Gear Spline/Teeth | 15 T estimate |
| Shaft Size | (add) |
| Rotation Mode | Positional |
| Rotation/Support | Bushing |
| Backlash | (add) |
| Control & Signal | |
| Modulation | Analog |
| Direction | Clockwise |
| Rotational Range | 80° |
| Mechanical Limit | 165° |
| Pulse Cycle | 20 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1500 µs |
| Dead Band | 8 µs |
| Refresh Rate | 50 Hz |
| 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-4–140 °F |
| Water Rating | Not Rated |
| Certification | (add) |
| Idle Current | 0.009 A9 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 160 mm6.3 in |
| Origin | |
| Country of Origin | Philippines |
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.
Performance Analysis
| Shaft Power | 0.61–0.86 W |
| Torque Density | 2.1687 oz-in/g Stronger than 68% of the 67 Analog Mini servos in the database |
| Torque-to-Volume Ratio | 56.44 oz-in/in³ Denser torque than 64% of the 67 Analog Mini servos in the database |
| Power Density | 1.353 W/in³ More power-dense than 90% of the 166 Analog Mini servos in the database |
| Speed-to-Weight | 0.54765 (1/sec·g) Faster than 77% of the 67 Analog Mini servos in the database |
| Speed-Torque Trade-off | 3.96 Better balanced than 30% of the 67 Analog Mini servos in the database |
| Current-per-Torque Ratio | 0.0417 A/oz-in More efficient than 13% of the 55 Hitec servos in the database |
| Idle-to-Running Current Ratio | 0.041 Lower idle draw than 52% of the 34 Hobby servos in the database |
| No-Load vs Stall Current Spread | 6.82 Narrower current spread than 52% of the 61 Hobby servos in the database |
| Torque Gain per Volt | 13.89%/V More voltage-responsive (torque) than 51% of the 46 Analog Mini servos in the database |
| Speed Gain per Volt | 18.52%/V More voltage-responsive (speed) than 72% of the 47 Analog Mini servos in the database |
| Voltage Range Width | 1.2 V Wider voltage range than 79% of the 77 Analog Mini servos in the database |
| Dead-Band-to-Pulse-Width Ratio | 0.0067 Finer dead band than 4% of the 58 Hitec servos in the database |
Notes
This servo comes in a metal gear version that has been discontinued, HS-81MG.
Quick Actions
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Reviews (4)
-
wally
June 17, 2016Application(s): 1500mm warbird
Comments: These are cheap so i guess you get what you pay for. The gears strip easily. Had a crash and both ailerin servos striped.
Trick Wings, Zagi
February 4, 2014Application(s): The HS-80 and later the HS-81 has been used for elevon servos in the Zagi THL and all of the electric flying wings for 15 years.
Comments: The way we rate servos is by service, availability and price. The HS-81 rates high for our mixed elevon application. Very few returns or user issues. It's a reliable servo.
Gary Parker
January 13, 2012Application(s): Mid-size power planes and gliders
Comments: I have been disappointed by these servos. Sure, they are cheap, but they develop slop, and they strip easily. Hitec HS-85MGs are the same size but are far stronger and better. But then again, 85s cost around twice as much.
RocketGuy
November 7, 2009Application(s): Elevon control, CombatWings MiniXE (100mph 34"flying wing)
Comments: A solid well modulated servo. Quick, precise, and crash resistant. Very impressive for a micro servo. I frequently had roll rates exceeding 600deg/sec and yet was able to instinctively enter level flight at will.