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Technical Specifications
Last Updated: 2026-09-16Identity
Performance
Physical
Drivetrain
Control & Signal
Electrical & Environment
Connectivity
Origin
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| Identity | |
| Brand |  |
| Product Number | BMS-620MG |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
144.00 oz-in
10.37 kg-cm
1.0 N-m
4.8V
126.00 oz-in
9.07 kg-cm
0.9 N-m
|
| Speed |
6.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
4.8V
0.15 sec/60°
400.0 deg/s
66.7 RPM
|
| Running Current | (add) |
| Stall Current | 2.35–2.35 A2350–2350 mA |
| Physical | |
| Weight | 1.80 oz51.0 g |
| Dimensions |
L 1.59 in W 0.79 in H 1.65 in L 40.5 mm W 20.0 mm H 42.0 mm |
| Case Material | (add) |
| Drivetrain | |
| Motor Type | 3-pole |
| Motor Drive | MOS |
| Gears | Metal |
| Gear Spline/Teeth | 25 T estimate |
| Shaft Size | (add) |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Backlash | (add) |
| Control & Signal | |
| Modulation | Analog |
| Direction | Clockwise |
| Rotational Range | (add) |
| Mechanical Limit | (add) |
| Pulse Cycle | 125 ms |
| Pulse Width | 1100-1900 µs |
| Neutral Position | 1520 µs |
| Dead Band | 3 µs |
| Refresh Rate | 125 Hz |
| Angle Sensor | (add) |
| Control System | PWM |
| Programmable | No |
| Signal Voltage | (add) |
| Electrical & Environment | |
| Operating Voltage | 4.5–6.5 V |
| Power Source | Ni-MH / Ni-CD |
| Regulator Type | (add) |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | (add) |
| Certification | CE | ROHS |
| Idle Current | 3.000 A3,000 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
| Origin | |
| Country of Origin | Taiwan |
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.
Performance Analysis
| Shaft Power | 1.55–2.05 W |
| Torque Density | 2.4706 oz-in/g |
| Torque-to-Volume Ratio | 60.73 oz-in/in³ |
| Power Density | 0.987 W/in³ More power-dense than 77% of the 421 Analog Standard servos in the database |
| Speed-to-Weight | 0.13072 (1/sec·g) |
| Speed-Torque Trade-off | 18.90 |
| Current-per-Torque Ratio | 0.0187 A/oz-in |
| Voltage Range Width | 2.0 V Wider voltage range than 93% of the 185 Analog Standard servos in the database |
| Dead-Band-to-Pulse-Width Ratio | 0.0038 Finer dead band than 67% of the 37 Analog Standard servos in the database |
Quick Actions
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Reviews (2)
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January 22, 2019Application(s):
Comments: Good servo !
Seb
April 30, 2015Application(s): Steering on a Tamiya Monster Beetle
Comments: Deception...
When I got it, I've been impressed by its look and the feeling of quality - and it was very cheap, even if chinese crap is cheaper...
Speed, torque, precision were very good too! I didn't recognize my beetle! But the dream didn't last long : total extinction after a while.
And now, it re-functions... but how to make confidence toward it?