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Technical Specifications
Last Updated: 2026-10-22| Identity | |
| Brand |  |
| Product Number | SPMS651 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
7.4V
103.00 oz-in
7.42 kg-cm
0.7 N-m
7.2V
103.00 oz-in
7.42 kg-cm
0.7 N-m
6.0V
88.00 oz-in
6.34 kg-cm
0.6 N-m
Average
|
| Speed |
7.4V
0.12 sec/60°
491.8 deg/s
82.0 RPM
6.0V
0.14 sec/60°
419.6 deg/s
69.9 RPM
Above Average
|
| Physical | |
| Weight | 2.12 oz60.0 gBelow Average |
| Dimensions |
L 1.58 in W 0.79 in H 1.55 in L 40.1 mm W 20.1 mm H 39.4 mm |
| Drivetrain | |
| Motor Type | DC |
| Gears | Metal |
| Gear Spline/Teeth | 23 T |
| Rotation Mode | Positional |
| Control & Signal | |
| Modulation | Analog |
| Rotational Range | 120° |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–7.4 V |
| Water Rating | Waterproof |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 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 | Average Stronger than 57% of 198 Analog Standard servos at 6.0V |
| Speed | Above Average Faster than 81% of 195 Analog Standard servos at 6.0V |
| Weight | Below Average Lighter than 11% of 447 Analog Standard servos |
Performance Analysis
| Shaft Power | 1.14–1.56 W |
| Power Density | 0.807 W/in³ More power-dense than 70% of 432 Analog Standard servos |
| Torque Density | 1.4667 oz-in/g Stronger than 41% of 198 Analog Standard servos |
| Torque-to-Volume Ratio | 45.48 oz-in/in³ Denser torque than 55% of 198 Analog Standard servos |
| Speed-to-Weight | 0.11655 (1/sec·g) Faster than 58% of 195 Analog Standard servos |
| Speed-Torque Trade-off | 12.58 Better balanced than 46% of 195 Analog Standard servos |
| Torque Gain per Volt | 12.18%/V More voltage-responsive (torque) than 39% of 156 Analog Standard servos |
| Speed Gain per Volt | 12.29%/V More voltage-responsive (speed) than 40% of 156 Analog Standard servos |
| Voltage Range Width | 1.4 V Wider voltage range than 82% of 239 Analog Standard servos |
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Reviews (15)
Includes 15 reviews aggregated from around the web.
Owner opinion is mostly negative. This is the stock steering servo in several Arrma 3S and 6S trucks, and owners on RC forums call it underpowered, sluggish and poor, with some failures after a short time, for example one that failed in under ten runs and only turned one direction. Several owners replace it with an aftermarket servo early. A few note it is not very expensive to replace and has respectable torque for a stock part.
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