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Technical Specifications
Last Updated: 2026-10-22| Identity | |
| Brand |  |
| Product Number | FS90R |
| Category | Robotics |
| Performance | |
| Torque |
6.0V
20.84 oz-in
1.50 kg-cm
0.1 N-m
4.8V
18.06 oz-in
1.30 kg-cm
0.1 N-m
Average
|
| Speed |
6.0V
0.10 sec/60°
600.0 deg/s
100.0 RPM
4.8V
0.13 sec/60°
480.0 deg/s
80.0 RPM
Average
|
| Running Current |
6.0V
0.130 A
130 mA
4.8V
0.110 A
110 mA
Above Average
|
| Stall Current | 0.7–0.8 A700–800 mAAverage |
| Physical | |
| Weight | 0.32 oz9.0 gAverage |
| Shape | Boxed |
| Dimensions |
L 0.886 in W 0.476 in H 1.091 in L 22.5 mm W 12.1 mm H 27.7 mm |
| Case Material | Nylon / Fiberglass |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Nylon |
| Gear Spline/Teeth | 21 T |
| Rotation Mode | Continuous |
| Rotation/Support | Bushing |
| Control & Signal | |
| Modulation | Analog |
| Direction | Counterclockwise |
| Rotational Range | 360° |
| Mechanical Limit | No Limit |
| Pulse Width | 700-2300 µs |
| Neutral Position | 1500 µs |
| Dead Band | 90 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -15–70 °C5–158 °F |
| Certification | CE | ROHS |
| Idle Current | 0.006 A6 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 250 mm9.84 in |
| Origin | |
| Country of Origin | China |
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 45% of 160 Analog Micro servos at 4.8V |
| Speed | Average Faster than 37% of 160 Analog Micro servos at 4.8V |
| Weight | Average Lighter than 44% of 336 Analog Micro servos |
| Running Current | Above Average Lower draw than 80% of 31 Analog Micro servos at 4.8V |
| Stall Current | Average Lower draw than 38% of 48 Analog Micro servos |
Performance Analysis
| Shaft Power | 0.27–0.39 W |
| Power Density | 0.837 W/in³ More power-dense than 48% of 322 Analog Micro servos |
| Torque Density | 2.0067 oz-in/g Stronger than 42% of 160 Analog Micro servos |
| Torque-to-Volume Ratio | 39.25 oz-in/in³ Denser torque than 25% of 160 Analog Micro servos |
| Speed-to-Weight | 0.88889 (1/sec·g) Faster than 47% of 160 Analog Micro servos |
| Speed-Torque Trade-off | 2.26 Better balanced than 50% of 159 Analog Micro servos |
| Current-per-Torque Ratio | 0.0443 A/oz-in More efficient than 43% of 38 Analog Micro servos |
| Idle-to-Running Current Ratio | 0.055 Lower idle draw than 43% of 24 Analog Micro servos |
| No-Load vs Stall Current Spread | 7.27 Narrower current spread than 14% of 23 Analog Micro servos |
| Torque Gain per Volt | 12.83%/V More voltage-responsive (torque) than 38% of 101 Analog Micro servos |
| Speed Gain per Volt | 20.83%/V More voltage-responsive (speed) than 81% of 101 Analog Micro servos |
| Voltage Range Width | 1.2 V Wider voltage range than 37% of 174 Analog Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0563 Finer dead band than 0% of 42 Analog Micro servos |
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Reviews (3)
Includes 2 reviews aggregated from around the web.
There are few reviews for this servo on the web. A hands-on roundup picks it as a standout continuous-rotation servo, praising smooth 360-degree rotation and reliable power for Arduino and Raspberry Pi projects.
-
billboyheritagesurvey
March 8, 2015Application(s): Pan drive for kite aerial photography (KAP) rig
Comments: This servo is a rare example of a continuous rotation (CR) 360degree servo in the 'micro' format.
It is lightweight and responds well to direct radio control.
Under pulse control (e.g. Gentles clickPan Pro) it is very slow and responds in very short steps.