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Blue Bird BMS-621MG
Standard

Blue Bird BMS-621MG

Compatible Hardware

*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-09-16
Identity
Brand Blue Bird
Product Number (add)
Category Hobby
Performance
Torque
6.0V 100.00 oz-in
4.8V 89.00 oz-in
Speed
6.0V 0.10 sec/60°
4.8V 0.13 sec/60°
Running Current (add)
Stall Current (add)
Physical
Weight 1.66 oz
Dimensions L 1.59 in
W 0.79 in
H 1.50 in
Case Material (add)
Drivetrain
Motor Type 3-pole
Motor Drive (add)
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 (add)
Rotational Range (add)
Mechanical Limit (add)
Pulse Cycle 8 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 (add)
Regulator Type (add)
Temperature (add)
Water Rating (add)
Certification (add)
Idle Current (add)
Connectivity
Connector JR (Universal)
Wire Length (add)
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 1.27–1.85 W
Torque Density1.8936 oz-in/g
Torque-to-Volume Ratio47.42 oz-in/in³
Power Density0.985 W/in³
More power-dense than 76% of the 421 Analog Standard servos in the database
Speed-to-Weight0.16367 (1/sec·g)
Speed-Torque Trade-off11.57
Voltage Range Width2.0 V
Wider voltage range than 92% of the 185 Analog Standard servos in the database

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