Discover XQ-Power Servos in Our eBay Store!
Shop Now
Technical Specifications
Last Updated: 2026-10-08
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SPMS905 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
7.2V
555.50 oz-in
40.00 kg-cm
3.9 N-m
7.0V
555.50 oz-in
40.00 kg-cm
3.9 N-m
6.0V
537.72 oz-in
38.72 kg-cm
3.8 N-m
Top 10%
|
| Speed |
7.2V
0.18 sec/60°
333.3 deg/s
55.6 RPM
6.0V
0.20 sec/60°
300.0 deg/s
50.0 RPM
Bottom 10%
|
| Physical | |
| Weight | 6.00 oz170.0 gBottom 10% |
| Dimensions |
L 2.34 in W 1.54 in H 2.17 in L 59.4 mm W 39.1 mm H 55.1 mm |
| Drivetrain | |
| Motor Type | DC |
| Gears | Metal |
| Gear Spline/Teeth | 15 T |
| Control & Signal | |
| Modulation | Digital |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–7.2 V |
| Water Rating | Waterproof |
| 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 | Top 10% Stronger than 94% of 1043 Digital Standard servos at 6.0V |
| Speed | Bottom 10% Faster than 10% of 1041 Digital Standard servos at 6.0V |
| Weight | Bottom 10% Lighter than 0% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 4.97–5.71 W |
| Power Density | 0.730 W/in³ More power-dense than 11% of 1759 Digital Standard servos |
| Torque Density | 3.1631 oz-in/g Stronger than 45% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 68.76 oz-in/in³ Denser torque than 25% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.02941 (1/sec·g) Faster than 0% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 107.54 Better balanced than 97% of 1031 Digital Standard servos |
| Torque Gain per Volt | 2.76%/V More voltage-responsive (torque) than 1% of 850 Digital Standard servos |
| Speed Gain per Volt | 9.25%/V More voltage-responsive (speed) than 13% of 871 Digital Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 12% of 1539 Digital Standard servos |
Similar Active Servos
Reviews of Spektrum S905
Be the first to review!