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Technical Specifications
Last Updated: 2026-09-16
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| 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 |
6.0V
0.180 A
180 mA
4.8V
0.170 A
170 mA
|
| Stall Current | 2.35–2.35 A2350–2350 mABelow Average |
| Physical | |
| Weight | 1.80 oz51.0 gAverage |
| Dimensions |
L 1.594 in W 0.787 in H 1.654 in L 40.5 mm W 20.0 mm H 42.0 mm |
| Drivetrain | |
| Motor Type | 3-pole |
| Motor Drive | MOS |
| Gears | Metal |
| Gear Spline/Teeth | 25 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Direction | Clockwise |
| Pulse Cycle | 125 ms |
| Pulse Width | 1100-1900 µs |
| Neutral Position | 1520 µs |
| Dead Band | 3 µs |
| Refresh Rate | 125 Hz |
| Control System | PWM |
| Programmable | No |
| Electrical & Environment | |
| Operating Voltage | 4.5–6.5 V |
| Power Source | Ni-MH / Ni-CD |
| Temperature | -20–60 °C-4–140 °F |
| 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.
Class Comparison
| Weight | Average Lighter than 41% of 448 Analog Standard servos |
| Stall Current | Below Average Lower draw than 19% of 64 Analog Standard servos |
Performance Analysis
| Shaft Power | 1.55–2.05 W |
| Power Density | 0.987 W/in³ More power-dense than 77% of 437 Analog Standard servos |
| Torque Density | 2.4706 oz-in/g |
| Torque-to-Volume Ratio | 60.73 oz-in/in³ |
| Speed-to-Weight | 0.13072 (1/sec·g) |
| Speed-Torque Trade-off | 18.90 |
| Current-per-Torque Ratio | 0.0187 A/oz-in |
| Idle-to-Running Current Ratio | 17.647 |
| No-Load vs Stall Current Spread | 13.82 |
| Voltage Range Width | 2.0 V Wider voltage range than 92% of 229 Analog Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0038 Finer dead band than 65% of 49 Analog Standard servos |
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Reviews (2)
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000000000
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?