Part comparison

Hitec D840WP vs KST X20-4208

A side-by-side comparison of source-backed specifications within the same subcategory.

12 shared specs3 scored

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HitecHitec D840WPD840WP

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KSTKST X20-4208X20-4208

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Directional spec summary

Counts across 3 numeric specifications with a clear higher-or-lower direction.

Part A leads

Tied

Part B leads

These are metric-by-metric differences, not an overall performance score. Check the values below.

Specifications

12 specifications compared side by side.

Hitec D840WP / KST X20-4208
Compare bySpecification	AHitecHitec D840WP	BKSTKST X20-4208
Performance3
Stall torque	2.942 Nm	4.511 Nm1.569 Nm higher
Stall torque @ 7.4V	30 kg·cm	46 kg·cm16 kg·cm higher
Speed @ 7.4V	0.11 s/60°	0.07 s/60°0.04 s/60° lower
Electrical1
Nominal voltage	7.4 V	7.4 V
Mechanical & integration4
Motor kind	Rc servo	Rc servo
Drive principle	servo actuator	servo actuator
ArchitectureUse-dependent	Rc servo module	Integrated servo module
Gear materialUse-dependent	Steel	metal
Control & communication3
Communication interfaces	PWM	PWM
Control modes	PWM servo	PWM servo
Servo signal	PWM	PWM
Other specifications1
PWM pulse center	1500 µs	1500 µs

AHitecHitec D840WP

BKSTKST X20-4208

Performance3

Stall torque

Part A2.942 Nm

Part B4.511 Nm1.569 Nm higher

Stall torque @ 7.4V

Part A30 kg·cm

Part B46 kg·cm16 kg·cm higher

Speed @ 7.4V

Part A0.11 s/60°

Part B0.07 s/60°0.04 s/60° lower

Electrical1

Nominal voltage

Part A7.4 V

Part B7.4 V

Mechanical & integration4

Motor kind

Part ARc servo

Part BRc servo

Drive principle

Part Aservo actuator

Part Bservo actuator

ArchitectureUse-dependent

Part ARc servo module

Part BIntegrated servo module

Gear materialUse-dependent

Part ASteel

Part Bmetal

Control & communication3

Communication interfaces

Part APWM

Part BPWM

Control modes

Part APWM servo

Part BPWM servo

Servo signal

Part APWM

Part BPWM

Other specifications1

PWM pulse center

Part A1500 µs

Part B1500 µs

Product sources

Product sources used by this comparison

Hitec D840WPNo public source

KST X20-4208Open source ↗