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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SPMSA6390 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
66.70 oz-in
4.80 kg-cm
0.5 N-m
4.8V
48.60 oz-in
3.50 kg-cm
0.3 N-m
Below Average
|
| Speed |
6.0V
0.14 sec/60°
428.6 deg/s
71.4 RPM
4.8V
0.17 sec/60°
352.9 deg/s
58.8 RPM
Average
|
| Physical | |
| Weight | 1.31 oz37.0 gTop 10% |
| Dimensions |
L 1.52 in W 0.74 in H 1.36 in L 38.6 mm W 18.8 mm H 34.5 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Coreless Brushed |
| Gears | Nylon |
| Gear Spline/Teeth | 23 T estimate |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Analog |
| Rotational Range | 120° |
| Dead Band | 3 µs |
| Control System | PWM |
| Programmable | No |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 305 mm12.01 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 29% of 198 Analog Standard servos at 4.8V |
| Speed | Average Faster than 63% of 195 Analog Standard servos at 4.8V |
| Weight | Top 10% Lighter than 92% of 448 Analog Standard servos |
Performance Analysis
| Shaft Power | 0.53–0.88 W |
| Power Density | 0.576 W/in³ More power-dense than 50% of 433 Analog Standard servos |
| Torque Density | 1.3135 oz-in/g Stronger than 34% of 198 Analog Standard servos |
| Torque-to-Volume Ratio | 31.77 oz-in/in³ Denser torque than 34% of 198 Analog Standard servos |
| Speed-to-Weight | 0.15898 (1/sec·g) Faster than 89% of 195 Analog Standard servos |
| Speed-Torque Trade-off | 8.26 Better balanced than 18% of 195 Analog Standard servos |
| Torque Gain per Volt | 31.04%/V 4th-highest torque gain per volt of 156 Analog Standard servos |
| Speed Gain per Volt | 17.88%/V More voltage-responsive (speed) than 65% of 156 Analog Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 17% of 240 Analog Standard servos |
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Reviews (5)
Includes 5 reviews aggregated from around the web.
There are few written reviews for this servo on the web, but the ratings are consistently high. A major retailer shows 5 out of 5 from 5 reviews, and the manufacturer's page shows 4.9. Pilots describe it as a reliable, no-frills budget servo for trainers and park flyers that keeps working flight after flight.
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