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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SPMSS9120BL |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
8.4V
1,453.50 oz-in
104.66 kg-cm
10.3 N-m
7.4V
1,209.00 oz-in
87.06 kg-cm
8.5 N-m
6.0V
1,173.00 oz-in
84.47 kg-cm
8.3 N-m
Top 10%
|
| Speed |
8.4V
0.21 sec/60°
285.7 deg/s
47.6 RPM
7.4V
0.23 sec/60°
260.9 deg/s
43.5 RPM
6.0V
0.29 sec/60°
206.9 deg/s
34.5 RPM
Bottom 10%
|
| Physical | |
| Weight | 6.30 oz178.6 gBottom 10% |
| Dimensions |
L 2.47 in W 1.18 in H 1.84 in L 62.7 mm W 30.0 mm H 46.7 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Metal / Steel |
| Gear Spline/Teeth | 15 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Power Source | 2S LiPo |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 152 mm5.98 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 | Top 10% Stronger than 100% of 25 Digital Large servos at 6.0V |
| Speed | Bottom 10% Faster than 4% of 24 Digital Large servos at 6.0V |
| Weight | Bottom 10% Lighter than 1% of 145 Digital Large servos |
Performance Analysis
| Shaft Power | 7.48–12.80 W |
| Power Density | 2.386 W/in³ More power-dense than 80% of 112 Digital Large servos |
| Torque Density | 6.5678 oz-in/g 1st-highest torque density of 24 Digital Large servos |
| Torque-to-Volume Ratio | 218.73 oz-in/in³ 4th-highest torque-to-volume ratio of 25 Digital Large servos |
| Speed-to-Weight | 0.01931 (1/sec·g) Faster than 0% of 23 Digital Large servos |
| Speed-Torque Trade-off | 340.16 1st-highest speed-torque trade-off of 22 Digital Large servos |
| Torque Gain per Volt | 9.96%/V More voltage-responsive (torque) than 0% of 36 Spektrum servos |
| Speed Gain per Volt | 15.87%/V More voltage-responsive (speed) than 44% of 33 Spektrum servos |
| Voltage Range Width | 2.4 V Wider voltage range than 25% of 124 Digital Large servos |
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Reviews (3)
Includes 3 reviews aggregated from around the web.
There are very few reviews for this servo on the web. One Reddit owner reports it struggling to lift a 17-pound load with a 30 mm horn at 8V, and another builder reports being largely unsuccessful controlling it with a Pololu Maestro board.
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