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Technical Specifications
Last Updated: 2026-09-14| Identity | |
| Brand |  |
| Product Number | M45CHW |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
624.93 oz-in
45.00 kg-cm
4.4 N-m
6.0V
486.06 oz-in
35.00 kg-cm
3.4 N-m
Top 10%
|
| Speed |
8.4V
0.11 sec/60°
545.5 deg/s
90.9 RPM
6.0V
0.12 sec/60°
500.0 deg/s
83.3 RPM
Average
|
| Running Current |
8.4V
7.000 A
7,000 mA
6.0V
5.000 A
5,000 mA
Bottom 10%
|
| Stall Current | 4.5–6.8 A4500–6800 mABelow Average |
| Physical | |
| Weight | 2.65 oz75.0 gBelow Average |
| 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 | Coreless |
| Motor Drive | MOS |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 60° |
| Mechanical Limit | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Regulator Type | Direct |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | IP67 |
| Idle Current | 0.600 A600 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
| Torque | Top 10% Stronger than 90% of 1060 Digital Standard servos at 6.0V |
| Speed | Average Faster than 63% of 1045 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 21% of 1880 Digital Standard servos |
| Running Current | Bottom 10% Lower draw than 3% of 226 Digital Standard servos at 6.0V |
| Stall Current | Below Average Lower draw than 11% of 570 Digital Standard servos |
Performance Analysis
| Shaft Power | 7.49–10.50 W |
| Power Density | 5.327 W/in³ More power-dense than 81% of 1768 Digital Standard servos |
| Torque Density | 6.4808 oz-in/g Stronger than 91% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 246.47 oz-in/in³ Denser torque than 91% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.11111 (1/sec·g) Faster than 47% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 58.33 Better balanced than 84% of 1034 Digital Standard servos |
| Current-per-Torque Ratio | 0.0140 A/oz-in More efficient than 53% of 331 Digital Standard servos |
| Idle-to-Running Current Ratio | 0.120 Lower idle draw than 30% of 167 Digital Standard servos |
| No-Load vs Stall Current Spread | 1.36 Narrower current spread than 93% of 179 Digital Standard servos |
| Torque Gain per Volt | 11.90%/V More voltage-responsive (torque) than 27% of 873 Digital Standard servos |
| Speed Gain per Volt | 3.79%/V More voltage-responsive (speed) than 1% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 48% of 1560 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 78% of 504 Digital Standard servos |
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Reviews (315)
Includes 315 reviews aggregated from around the web.
Owners mostly describe it as a quiet, smooth and strong upgrade over stock steering servos in crawlers, 1/8 bashers and high-speed cars, and many call it excellent value, saying it outperforms servos that cost far more. Praise centers on near-silent gear noise, fast and powerful steering with large tires, thick lead wires, steady centering and cool running. Several owners run it on a 7.4V supply, and one tester found it produced more power at 7.4V than at 8.4V. A sound test ranked it the quietest servo of those tried, although some listeners hear a faint high-pitched whine. Complaints include actual speed being roughly half of the rated figure, travel well short of 180 degrees and uneven left to right, and a servo arm described as unusable. A minority report early failures: units that lasted only two runs, shaking at neutral and then turning on their own, steering that stopped after the first run, a pair that failed on the bench in an aircraft, and one that drew enough current on an airboat to heat the wires. One tester called it overpriced for its output compared with cheaper options. Satisfied owners clearly outnumber unhappy ones.
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