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Technical Specifications
Last Updated: 2026-10-08| Identity | |
| Brand |  |
| Product Number | BMS-631MG |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
86.00 oz-in
6.19 kg-cm
0.6 N-m
4.8V
69.00 oz-in
4.97 kg-cm
0.5 N-m
|
| Speed |
6.0V
0.08 sec/60°
750.0 deg/s
125.0 RPM
4.8V
0.10 sec/60°
600.0 deg/s
100.0 RPM
|
| Physical | |
| Weight | 1.62 oz45.9 gAverage |
| Dimensions |
L 1.60 in W 0.80 in H 1.50 in L 40.6 mm W 20.3 mm H 38.1 mm |
| Drivetrain | |
| Gears | Metal |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Connectivity | |
| Connector | JR (Universal) estimate |
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 60% of 448 Analog Standard servos |
Performance Analysis
| Shaft Power | 1.28–1.99 W |
| Power Density | 1.035 W/in³ More power-dense than 81% of 437 Analog Standard servos |
| Torque Density | 1.5033 oz-in/g |
| Torque-to-Volume Ratio | 35.94 oz-in/in³ |
| Speed-to-Weight | 0.21787 (1/sec·g) |
| Speed-Torque Trade-off | 6.90 |
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Reviews (2)
-
Dick, ROC Ter AA, Helmond, NL
July 5, 2013Application(s): industrial delta robot for educational purposes
Comments: Used with PC application in C# controlling the servo by an SD20 servo controller and i2c/USB from Robot Electronics UK
- Powerful low priced servo.
- The accuracy could be better for this application. Very small steps are not executed but delayed to a larger step.
- High surge current of 3 Amps and up.
- A bit noisy unsubtle movementluke662
April 13, 2012Application(s): Off roaders
Comments: These are brilliant servos with fantastic speeds and tourqe for the money. I have been using them for a few years.
The only downside i have found is the plastic mounting lugs can crack if you over tighten the servo mount screw but this is rare.