KST X20-1806

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	KST-0419
Category	Hobby
Performance
Torque	8.4V 249.84 oz-in 7.4V 222.08 oz-in 6.0V 194.32 oz-in Above Average
Speed	8.4V 0.06 sec/60° 7.4V 0.07 sec/60° 6.0V 0.08 sec/60° Above Average
Stall Current	5.2–8.2 ABottom 10%
Physical
Weight	1.76 ozAverage
Dimensions	L 1.595 in W 0.787 in H 0.909 in
Case Material	Aluminum
Drivetrain
Motor Type	Brushless
Gears	Steel
Gear Spline/Teeth	25 T estimate
Rotation Mode	Positional
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	200°
Pulse Cycle	3.003 ms
Pulse Width	900-2100 µs
Neutral Position	1520 µs
Refresh Rate	333 Hz
Angle Sensor	Potentiometer
Control System	PWM
Programmable	Yes
Signal Voltage	3.3–5.0V
Electrical & Environment
Operating Voltage	6–8.4 V
Temperature	-20–65 °C
Water Rating	IP65
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	China

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Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Class Comparison

Torque	Above Average Stronger than 69% of 186 Digital Low Profile servos at 6.0V
Speed	Above Average Faster than 76% of 183 Digital Low Profile servos at 6.0V
Weight	Average Lighter than 60% of 304 Digital Low Profile servos
Stall Current	Bottom 10% Lower draw than 1% of 81 Digital Low Profile servos

Performance Analysis

Shaft Power	4.49–7.70 W
Power Density	6.743 W/in³ More power-dense than 80% of 273 Digital Low Profile servos
Torque Density	3.8864 oz-in/g Stronger than 77% of 185 Digital Low Profile servos
Torque-to-Volume Ratio	170.19 oz-in/in³ Denser torque than 78% of 186 Digital Low Profile servos
Speed-to-Weight	0.25000 (1/sec·g) Faster than 75% of 182 Digital Low Profile servos
Speed-Torque Trade-off	15.55 Better balanced than 53% of 183 Digital Low Profile servos
Current-per-Torque Ratio	0.0422 A/oz-in More efficient than 11% of 58 Digital Low Profile servos
Torque Gain per Volt	11.90%/V More voltage-responsive (torque) than 25% of 164 Digital Low Profile servos
Speed Gain per Volt	13.89%/V More voltage-responsive (speed) than 46% of 163 Digital Low Profile servos
Voltage Range Width	2.4 V Wider voltage range than 50% of 276 Digital Low Profile servos