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Blue Bird BMS-631
Standard Discontinued

Blue Bird BMS-631

Compatible Hardware

*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-08-11
Identity
Brand Blue Bird
Product Number (add)
Category Hobby
Discontinued Yes
Performance
Torque
6.0V 86.00 oz-in
4.8V 69.00 oz-in
Speed
6.0V 0.08 sec/60°
4.8V 0.10 sec/60°
Running Current (add)
Stall Current (add)
Shaft Power 1.28–1.99 W
Physical
Weight 1.52 oz
Dimensions L 1.59 in
W 0.79 in
H 1.52 in
Case Material (add)
Drivetrain
Motor Type (add)
Motor Drive (add)
Gears Plastic
Gear Spline/Teeth 25 T estimate
Rotation Mode (add)
Rotation/Support Dual Bearings
Backlash (add)
Control & Signal
Modulation Analog
Direction (add)
Rotational Range (add)
Mechanical Limit (add)
Pulse Cycle 125 ms
Pulse Width (add)
Neutral Position 1520 µs
Dead Band (add)
Refresh Rate 125 Hz
Angle Sensor (add)
Control System PWM
Programmable (add)
Signal Voltage (add)
Electrical & Environment
Operating Voltage 4.5–6.5 V
Power Source Ni-MH / Ni-CD
Regulator Type (add)
Temperature (add)
Water Rating (add)
Certification (add)
Idle Current (add)
Connectivity
Connector JR (Universal)
Wire Length (add)
Origin
Country of Origin (add)

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.

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Reviews (2)

  • Hugo Biermann

    July 16, 2017

    Application(s): Tamiya Lunchbox and DT01

    Comments: Its a budget servo that performs like a beast.

    Replaced an aging servo in my dt01 with one of these and was super impressed.
    Its that impressive that I got another one for my lunchbox. Replacing a Savox 0251mg. Its been taking a huge beating and not one glitch. Super fast and accurate.

    Can highly recommend. Will buy more for future projects.

  • DustBen

    January 20, 2012

    Application(s): I use the servos in 60 size (5-7 pound, 600-850 sq inch) sport and aerobatic models.

    Comments: They mount where the previously held Hitec HS425BB was without modification.
    The street price is $12.95 at a popular internet supply site.

    I feel entirely confident using these after 3-4 hours of bench and flight time.

    I give this a 5 star rating not because of pure quality (they're very good), but because the performance for the cost is superb (value).

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