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Technical Specifications
Last Updated: 2026-10-22| Identity | |
| Brand |  |
| Product Number | RDS3218 |
| Category | Robotics |
| Performance | |
| Torque |
6.8V
298.49 oz-in
21.49 kg-cm
2.1 N-m
5.0V
263.91 oz-in
19.00 kg-cm
1.9 N-m
|
| Speed |
6.8V
0.17 sec/60°
352.9 deg/s
58.8 RPM
5.0V
0.20 sec/60°
300.0 deg/s
50.0 RPM
|
| Running Current |
6.8V
5.000 A
5,000 mA
5.0V
4.000 A
4,000 mA
|
| Stall Current | 1.6–2.5 A1600–2500 mAAbove Average |
| Physical | |
| Weight | 2.12 oz60.0 gAverage |
| Shape | Boxed |
| Dimensions |
L 1.57 in W 0.79 in H 1.59 in L 39.9 mm W 20.1 mm H 40.4 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | 3-pole |
| Gears | Copper / Aluminum |
| Gear Ratio | 342:1 |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 270° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 3 µs |
| Refresh Rate | 333 Hz |
| Control System | PWM |
| Programmable | No |
| Electrical & Environment | |
| Operating Voltage | 4.8–6.8 V |
| Temperature | -15–70 °C5–158 °F |
| Water Rating | IP66 |
| Certification | CE |
| Idle Current | 0.005 A5 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 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
| Weight | Average Lighter than 59% of 1879 Digital Standard servos |
| Stall Current | Above Average Lower draw than 74% of 570 Digital Standard servos |
Performance Analysis
| Shaft Power | 2.44–3.25 W |
| Power Density | 1.646 W/in³ More power-dense than 35% of 1767 Digital Standard servos |
| Torque Density | 4.3985 oz-in/g |
| Torque-to-Volume Ratio | 133.82 oz-in/in³ |
| Speed-to-Weight | 0.08333 (1/sec·g) |
| Speed-Torque Trade-off | 52.78 |
| Current-per-Torque Ratio | 0.0095 A/oz-in |
| Idle-to-Running Current Ratio | 0.001 |
| No-Load vs Stall Current Spread | 0.63 |
| Voltage Range Width | 2.0 V Wider voltage range than 40% of 1559 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0015 Finer dead band than 49% of 504 Digital Standard servos |
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Reviews (1)
Includes 1 review aggregated from around the web.
There are few reviews for this servo on the web specific to this model, and most come from a bracket-kit listing. Buyers of the RCmall RDS3218 set describe the servos as strong and responsive with serious torque, good quality for the price, and easy to build into robot arms and rover projects. One reviewer was unimpressed after looking at the pictured internal gears. Owners of similar DS3218-type servos in RC cars report slow response and stuttering, though that may not apply to this model.
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