HobbyKing 939MG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-09

Identity
Brand
Product Number	HK939MG
Category	Hobby
Performance
Torque	6.0V 37.48 oz-in 4.8V 34.70 oz-in Top 10%
Speed	6.0V 0.13 sec/60° 4.8V 0.14 sec/60° Below Average
Physical
Weight	0.44 ozBelow Average
Dimensions	L 0.886 in W 0.453 in H 0.969 in
Drivetrain
Motor Type	Coreless
Gears	Metal
Gear Spline/Teeth	21 T
Rotation Mode	Positional
Rotation/Support	Single Bearing
Control & Signal
Modulation	Analog
Rotational Range	80°
Dead Band	5 µs
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6 V
Temperature	-20–60 °C
Connectivity
Connector	JR (Universal) estimate
Wire Length	215 mm

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Amazon eBay

*Based on known specs.

Class Comparison

Torque	Top 10% Stronger than 93% of 170 Analog Micro servos at 4.8V
Speed	Below Average Faster than 19% of 170 Analog Micro servos at 4.8V
Weight	Below Average Lighter than 12% of 346 Analog Micro servos

Performance Analysis

Shaft Power	0.46–0.53 W
Power Density	1.372 W/in³ More power-dense than 86% of 333 Analog Micro servos
Torque Density	2.7760 oz-in/g Stronger than 88% of 170 Analog Micro servos
Torque-to-Volume Ratio	89.33 oz-in/in³ Denser torque than 96% of 170 Analog Micro servos
Speed-to-Weight	0.57143 (1/sec·g) Faster than 12% of 170 Analog Micro servos
Speed-Torque Trade-off	4.86 Better balanced than 95% of 169 Analog Micro servos
Torque Gain per Volt	6.68%/V More voltage-responsive (torque) than 7% of 96 Analog Micro servos
Speed Gain per Volt	6.40%/V More voltage-responsive (speed) than 3% of 96 Analog Micro servos
Voltage Range Width	1.2 V Wider voltage range than 28% of 182 Analog Micro servos