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Technical Specifications
Last Updated: 2026-10-25
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | HD-1581HB |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
36.10 oz-in
2.60 kg-cm
0.3 N-m
4.8V
30.60 oz-in
2.20 kg-cm
0.2 N-m
Average
|
| Speed |
6.0V
0.16 sec/60°
375.0 deg/s
62.5 RPM
4.8V
0.21 sec/60°
285.7 deg/s
47.6 RPM
Bottom 10%
|
| Running Current |
6.0V0.300 A300 mA |
| Stall Current | ≤1.2 A≤1200 mAAverage |
| Physical | |
| Weight | 0.43 oz12.3 gAverage |
| Dimensions |
L 0.90 in W 0.47 in H 1.16 in L 22.9 mm W 11.9 mm H 29.5 mm |
| Drivetrain | |
| Gears | Nylon |
| Gear Spline/Teeth | 21 T estimate |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Digital |
| Direction | Clockwise |
| Rotational Range | 44° |
| Mechanical Limit | 220° |
| Pulse Width | 700-2300 µs |
| Neutral Position | 1500 µs |
| Dead Band | 5 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -10–50 °C14–122 °F |
| Idle Current | 0.005 A5 mA |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 250 mm9.84 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
| Torque | Average Stronger than 61% of 349 Digital Micro servos at 4.8V |
| Speed | Bottom 10% Faster than 3% of 347 Digital Micro servos at 4.8V |
| Weight | Average Lighter than 41% of 597 Digital Micro servos |
| Stall Current | Average Lower draw than 45% of 188 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.27–0.42 W |
| Power Density | 0.850 W/in³ More power-dense than 11% of 563 Digital Micro servos |
| Torque Density | 2.4878 oz-in/g Stronger than 52% of 349 Digital Micro servos |
| Torque-to-Volume Ratio | 62.36 oz-in/in³ Denser torque than 36% of 345 Digital Micro servos |
| Speed-to-Weight | 0.38715 (1/sec·g) Faster than 7% of 347 Digital Micro servos |
| Speed-Torque Trade-off | 6.43 Better balanced than 80% of 345 Digital Micro servos |
| Current-per-Torque Ratio | 0.0392 A/oz-in More efficient than 48% of 98 Digital Micro servos |
| Idle-to-Running Current Ratio | 0.017 |
| No-Load vs Stall Current Spread | 4.00 |
| Torque Gain per Volt | 14.98%/V More voltage-responsive (torque) than 36% of 290 Digital Micro servos |
| Speed Gain per Volt | 26.05%/V More voltage-responsive (speed) than 89% of 295 Digital Micro servos |
| Voltage Range Width | 1.2 V Wider voltage range than 41% of 496 Digital Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0031 Finer dead band than 12% of 182 Digital Micro servos |
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