HobbyKing HK15178B

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-09

Identity
Brand
Product Number	9225000003
Category	Hobby
Performance
Torque	6.0V 13.88 oz-in 4.8V 12.49 oz-in Below Average
Speed	6.0V 0.10 sec/60° 4.8V 0.12 sec/60° Average
Physical
Weight	0.48 ozBelow Average
Dimensions	L 0.91 in W 0.47 in H 1.06 in
Drivetrain
Motor Type	Coreless
Gears	Metal
Gear Spline/Teeth	20 T
Control & Signal
Modulation	Digital
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal)

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Below Average Stronger than 11% of 328 Digital Micro servos at 4.8V
Speed	Average Faster than 41% of 328 Digital Micro servos at 4.8V
Weight	Below Average Lighter than 31% of 620 Digital Micro servos

Performance Analysis

Shaft Power	0.19–0.26 W
Power Density	0.566 W/in³ More power-dense than 4% of 590 Digital Micro servos
Torque Density	0.9252 oz-in/g Stronger than 2% of 327 Digital Micro servos
Torque-to-Volume Ratio	27.55 oz-in/in³ Denser torque than 4% of 327 Digital Micro servos
Speed-to-Weight	0.61728 (1/sec·g) Faster than 34% of 327 Digital Micro servos
Speed-Torque Trade-off	1.50 Better balanced than 17% of 327 Digital Micro servos
Torque Gain per Volt	9.27%/V More voltage-responsive (torque) than 10% of 268 Digital Micro servos
Speed Gain per Volt	16.67%/V More voltage-responsive (speed) than 46% of 273 Digital Micro servos
Voltage Range Width	1.2 V Wider voltage range than 20% of 511 Digital Micro servos