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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SPMS650 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V82.00 oz-in5.90 kg-cm0.6 N-m |
| Speed |
6.0V0.12 sec/60°500.0 deg/s83.3 RPM |
| Physical | |
| Weight | 1.76 oz50.0 gAbove 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 |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Nylon |
| Gear Spline/Teeth | 23 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 120° |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Water Rating | Waterproof |
| Connectivity | |
| Connector | JR (Universal) estimate |
| 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
| Weight | Above Average Lighter than 86% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.26 W |
| Power Density | 0.653 W/in³ More power-dense than 7% of 1762 Digital Standard servos |
| Torque Density | 1.6400 oz-in/g |
| Torque-to-Volume Ratio | 42.38 oz-in/in³ |
| Speed-to-Weight | 0.16667 (1/sec·g) |
| Speed-Torque Trade-off | 9.84 |
| Voltage Range Width | 1.2 V Wider voltage range than 12% of 1552 Digital Standard servos |
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Reviews (2)
Includes 2 reviews aggregated from around the web.
There are few reviews for this servo on the web. A Reddit user says their Spektrum S650, S651 and S652 servos all stopped working after two or three bashing sessions, and another suggests a cheap 30-35 kg metal-gear servo instead. An eBay listing shows mixed ratings.
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