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Technical Specifications
Last Updated: 2026-10-08
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
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
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
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 | -10–60 °C14–140 °F |
| Water Rating | Waterproof |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 350 mm13.78 in |
| Origin | |
| Country of Origin | China |
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 43% of 328 Digital Micro servos at 4.8V |
| Speed | Below Average Faster than 17% of 328 Digital Micro servos at 4.8V |
| Weight | Below Average Lighter than 24% of 620 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.31–0.67 W |
| Power Density | 1.621 W/in³ More power-dense than 44% of 590 Digital Micro servos |
| Torque Density | 1.5625 oz-in/g Stronger than 13% of 327 Digital Micro servos |
| Torque-to-Volume Ratio | 60.69 oz-in/in³ Denser torque than 35% of 327 Digital Micro servos |
| Speed-to-Weight | 0.41667 (1/sec·g) Faster than 9% of 327 Digital Micro servos |
| Speed-Torque Trade-off | 3.75 Better balanced than 64% of 327 Digital Micro servos |
| Torque Gain per Volt | 17.09%/V More voltage-responsive (torque) than 50% of 268 Digital Micro servos |
| Speed Gain per Volt | 19.23%/V More voltage-responsive (speed) than 62% of 273 Digital Micro servos |
| Voltage Range Width | 2.6 V Wider voltage range than 67% of 511 Digital Micro servos |
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