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Technical Specifications
Last Updated: 2026-10-08| Identity | |
| Brand |  |
| Product Number | 37985S |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
172.00 oz-in
12.39 kg-cm
1.2 N-m
4.8V
144.00 oz-in
10.37 kg-cm
1.0 N-m
|
| Speed |
6.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
4.8V
0.16 sec/60°
375.0 deg/s
62.5 RPM
|
| Running Current |
6.0V
0.240 A
240 mA
4.8V
0.200 A
200 mA
|
| Physical | |
| Weight | 2.19 oz62.0 gAverage |
| Dimensions |
L 1.57 in W 0.78 in H 1.45 in L 39.9 mm W 19.8 mm H 36.8 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Coreless |
| Motor Drive | MOS |
| Gears | Metal |
| Gear Spline/Teeth | 24 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 120° |
| Mechanical Limit | 175° |
| Pulse Cycle | 20 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 3.5–8.4 V |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | IP54 |
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
| Weight | Average Lighter than 54% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.66–2.45 W |
| Power Density | 1.378 W/in³ More power-dense than 28% of 1759 Digital Standard servos |
| Torque Density | 2.3226 oz-in/g |
| Torque-to-Volume Ratio | 81.10 oz-in/in³ |
| Speed-to-Weight | 0.10081 (1/sec·g) |
| Speed-Torque Trade-off | 23.04 |
| Voltage Range Width | 4.9 V Wider voltage range than 97% of 1539 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0017 Finer dead band than 45% of 468 Digital Standard servos |
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Reviews (1)
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Brandon
June 13, 2014Application(s): Steering servo on Rustler
Comments: For around 75 bucks it's a pretty decent servo. I like the fact that its got metal gears, coreless motor, and water resistant. I've gotten it wet plenty of times without any issues, although I did add some plasti-dip around the seams just to be on the safe side.
If you don't want to shell out the extra money for a high end titanium geared coreless servo I think the 7985 is a pretty good option. Its got plenty of torque for a Rustler and I'm sure it would do just fine in a 1/8 buggy also, but it would be nice if it was a little faster IMO for any kind of racing applications.