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Technical Specifications
Last Updated: 2026-10-22
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | HD-TR-4 |
| Category | Hobby |
| Performance | |
| Torque |
7.4V
36.11 oz-in
2.60 kg-cm
0.3 N-m
6.0V
30.56 oz-in
2.20 kg-cm
0.2 N-m
4.8V
25.00 oz-in
1.80 kg-cm
0.2 N-m
Average
|
| Speed |
7.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
6.0V
0.12 sec/60°
500.0 deg/s
83.3 RPM
4.8V
0.15 sec/60°
400.0 deg/s
66.7 RPM
Below Average
|
| Physical | |
| Weight | 0.56 oz16.0 gBelow Average |
| Dimensions |
L 0.886 in W 0.492 in H 0.945 in L 22.5 mm W 12.5 mm H 24.0 mm |
| Case Material | Plastic |
| Drivetrain | |
| Gears | Copper / Aluminum |
| Gear Spline/Teeth | 25 T |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 220° |
| Pulse Cycle | 20 ms |
| Neutral Position | 1520 µs |
| Refresh Rate | 50 Hz |
| Electrical & Environment | |
| Operating Voltage | 4.8–7.4 V |
| Temperature | -10–50 °C14–122 °F |
| Water Rating | Waterproof |
| Certification | RoHS |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 350 mm13.78 in |
| Origin | |
| Country of Origin | Poland |
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 | Average Stronger than 41% of 363 Digital Micro servos at 4.8V |
| Speed | Below Average Faster than 21% of 361 Digital Micro servos at 4.8V |
| Weight | Below Average Lighter than 28% of 665 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.31–0.67 W |
| Power Density | 1.621 W/in³ More power-dense than 46% of 625 Digital Micro servos |
| Torque Density | 1.5625 oz-in/g Stronger than 13% of 363 Digital Micro servos |
| Torque-to-Volume Ratio | 60.69 oz-in/in³ Denser torque than 35% of 359 Digital Micro servos |
| Speed-to-Weight | 0.41667 (1/sec·g) Faster than 16% of 361 Digital Micro servos |
| Speed-Torque Trade-off | 3.75 Better balanced than 59% of 358 Digital Micro servos |
| Torque Gain per Volt | 17.09%/V More voltage-responsive (torque) than 51% of 302 Digital Micro servos |
| Speed Gain per Volt | 19.23%/V More voltage-responsive (speed) than 60% of 305 Digital Micro servos |
| Voltage Range Width | 2.6 V Wider voltage range than 69% of 553 Digital Micro servos |
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Reviews (7)
Includes 7 reviews aggregated from around the web.
There are few reviews for this servo on the web. Reddit owners report it works perfectly in a LaTrax Prerunner with no buzzing and quick recentering, and report no issues for years in a TRX-4 and no complaints in a pair of SCX10.3 trucks, where it feels better than the Traxxas version.
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