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Technical Specifications
Last Updated: 2026-10-22| Identity | |
| Brand |  |
| Product Number | 32125S |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
49.00 oz-in
3.53 kg-cm
0.3 N-m
4.8V
42.00 oz-in
3.02 kg-cm
0.3 N-m
Below Average
|
| Speed |
6.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
4.8V
0.17 sec/60°
352.9 deg/s
58.8 RPM
Below Average
|
| Running Current |
6.0V
0.230 A
230 mA
4.8V
0.180 A
180 mA
|
| Stall Current | ≤1.2 A≤1200 mAAverage |
| Physical | |
| Weight | 0.84 oz23.8 gAverage |
| Dimensions |
L 1.18 in W 0.39 in H 1.33 in L 30.0 mm W 9.9 mm H 33.8 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | 3-pole |
| Gears | Metal |
| Gear Spline/Teeth | 25 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Direction | Clockwise |
| Rotational Range | 119° |
| Mechanical Limit | 119° |
| Pulse Cycle | 20 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1500 µs |
| Dead Band | 5 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | No |
| Signal Voltage | 3-5V |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | IP4X |
| Idle Current | 0.007 A7 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
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
| Torque | Below Average Stronger than 24% of 46 Slim servos at 4.8V |
| Speed | Below Average Faster than 24% of 47 Slim servos at 4.8V |
| Weight | Average Lighter than 39% of 97 Slim servos |
| Stall Current | Average Lower draw than 62% of 30 Slim servos |
Performance Analysis
| Shaft Power | 0.46–0.70 W |
| Power Density | 1.139 W/in³ More power-dense than 45% of 185 Hitec servos |
| Torque Density | 1.7647 oz-in/g Stronger than 42% of 133 Hitec servos |
| Torque-to-Volume Ratio | 68.62 oz-in/in³ Denser torque than 63% of 133 Hitec servos |
| Speed-to-Weight | 0.24716 (1/sec·g) Faster than 79% of 131 Hitec servos |
| Speed-Torque Trade-off | 7.14 Better balanced than 22% of 131 Hitec servos |
| Current-per-Torque Ratio | 0.0286 A/oz-in More efficient than 36% of 81 Hitec servos |
| Idle-to-Running Current Ratio | 0.041 Lower idle draw than 45% of 61 Hitec servos |
| No-Load vs Stall Current Spread | 6.67 Narrower current spread than 62% of 56 Hitec servos |
| Torque Gain per Volt | 13.89%/V More voltage-responsive (torque) than 15% of 125 Hitec servos |
| Speed Gain per Volt | 25.64%/V More voltage-responsive (speed) than 91% of 123 Hitec servos |
| Voltage Range Width | 1.2 V Wider voltage range than 50% of 170 Hitec servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0042 Finer dead band than 35% of 125 Hitec servos |
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Reviews (3)
Includes 1 review aggregated from around the web.
There are very few reviews for this servo on the web. One experienced modeler says Hitec HS-125MG and HS-85MG servos have never given him any problems. That same modeler had two of four servos from another brand fail before their first flight, which makes this a positive but isolated account.
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Saj
January 13, 2017Application(s): Wing servo for a 2.5m composite glider
Comments: There servos have terrible centering and I would not use them again. I have now switched to digital servos with good centering.
Gary Parker
January 13, 2012Application(s): Fast moulded gliders
Comments: These are very good, highly reliable servos. They are thin, but fairly large in other dimensions, and quite heavy. They make great servos for very thin wings in high performance planes. The metal gears are very reliable and resistant to stripping. I have crashed them many times and they have never stripped, never failed in any way. They seem more reliable and more resistant to stripping than the digital versions (5125s). Highly recommended. However if you can fit thicker servos in the wing then you could consider something like the even tougher Hitec HS-85mgs.