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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | HD-1550A |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
12.50 oz-in
0.90 kg-cm
0.1 N-m
4.8V
15.30 oz-in
1.10 kg-cm
0.1 N-m
Bottom 10%
|
| Speed |
6.0V
0.10 sec/60°
600.0 deg/s
100.0 RPM
4.8V
0.12 sec/60°
500.0 deg/s
83.3 RPM
Above Average
|
| Physical | |
| Weight | 0.19 oz5.5 gTop 10% |
| Dimensions |
L 0.83 in W 0.77 in H 0.79 in L 21.1 mm W 19.6 mm H 20.1 mm |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Plastic |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Bushing |
| Control & Signal | |
| Modulation | Analog |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Connectivity | |
| Connector | JR (Universal) estimate |
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 | Bottom 10% Stronger than 1% of 80 Analog Mini servos at 4.8V |
| Speed | Above Average Faster than 73% of 81 Analog Mini servos at 4.8V |
| Weight | Top 10% Lighter than 100% of 165 Analog Mini servos |
Performance Analysis
| Shaft Power | 0.23–0.24 W |
| Power Density | 0.467 W/in³ More power-dense than 12% of 163 Analog Mini servos |
| Torque Density | 2.7818 oz-in/g Stronger than 94% of 80 Analog Mini servos |
| Torque-to-Volume Ratio | 30.30 oz-in/in³ Denser torque than 8% of 80 Analog Mini servos |
| Speed-to-Weight | 1.51515 (1/sec·g) 1st-highest speed-to-weight of 81 Analog Mini servos |
| Speed-Torque Trade-off | 1.84 Better balanced than 5% of 80 Analog Mini servos |
| Torque Gain per Volt | -15.25%/V More voltage-responsive (torque) than 0% of 55 Analog Mini servos |
| Speed Gain per Volt | 16.67%/V More voltage-responsive (speed) than 56% of 56 Analog Mini servos |
| Voltage Range Width | 1.2 V Wider voltage range than 66% of 88 Analog Mini servos |
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Reviews (1)
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P3tras
September 18, 2011Application(s): Small foamies
Comments: I didn't like this servo. Really low torque, not precise, a lot of slop in the gear train. Stay away!