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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SKM21 |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
212.79 oz-in
15.32 kg-cm
1.5 N-m
4.8V
197.24 oz-in
14.20 kg-cm
1.4 N-m
Top 10%
|
| Speed |
6.0V
0.16 sec/60°
375.0 deg/s
62.5 RPM
4.8V
0.18 sec/60°
333.3 deg/s
55.6 RPM
Average
|
| Physical | |
| Weight | 1.96 oz55.6 gBelow Average |
| Dimensions |
L 1.59 in W 0.80 in H 1.57 in L 40.4 mm W 20.3 mm H 39.9 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Mechanical Limit | 180° |
| Neutral Position | 1520 µs |
| Dead Band | 4 µs |
| Refresh Rate | 50 Hz |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -10–50 °C14–122 °F |
| Water Rating | None |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 265 mm10.43 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 | Top 10% Stronger than 96% of 198 Analog Standard servos at 4.8V |
| Speed | Average Faster than 51% of 195 Analog Standard servos at 4.8V |
| Weight | Below Average Lighter than 26% of 448 Analog Standard servos |
Performance Analysis
| Shaft Power | 2.03–2.46 W |
| Power Density | 1.231 W/in³ More power-dense than 89% of 433 Analog Standard servos |
| Torque Density | 3.5475 oz-in/g Stronger than 96% of 198 Analog Standard servos |
| Torque-to-Volume Ratio | 98.77 oz-in/in³ Denser torque than 94% of 198 Analog Standard servos |
| Speed-to-Weight | 0.09992 (1/sec·g) Faster than 31% of 195 Analog Standard servos |
| Speed-Torque Trade-off | 35.51 Better balanced than 92% of 195 Analog Standard servos |
| Torque Gain per Volt | 6.57%/V More voltage-responsive (torque) than 6% of 156 Analog Standard servos |
| Speed Gain per Volt | 10.43%/V More voltage-responsive (speed) than 16% of 156 Analog Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 13% of 239 Analog Standard servos |
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