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Two compact metal-gear digital servos with silver aluminium cases and black mounting tabs

JUSHIDE

JUSHIDE JS6640 40KG Coreless Digital Servo IP66 2 Pack

SKU CH-37RC-R9CDM MPN JS6640

A pair of IP66 waterproof digital servos delivering up to 40 kg·cm torque for 1/8 and 1/10 scale RC vehicles

  • TypeGyros
  • Size/Dimensions40 mm x 20 mm x 40.5 mm
  • Length40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In)
  • Width40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In)
  • Height40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In)
  • Weight0.168 kilograms
  • Coreless motor for faster response and longer life
  • Up to 40 kg·cm stall torque at 7.4 V
  • IP66 waterproof and dust-tight for off-road use
  • Double ball bearings with 373:1 metal gear train
  • 180° or 270° travel via 500-2500 µs PWM

40 kg·cm coreless servo pair

This two-pack supplies a matched set of JUSHIDE JS6640 coreless digital servos rated at 40 kg·cm stall torque. They suit 1/8 and 1/10 scale RC cars, crawlers, buggies, robots and marine models that demand high torque in a compact 40 × 20 × 38.5 mm case.

IP66 sealing and metal gear train

Each unit combines an IP66-rated waterproof housing, double ball bearings and a 373:1 stainless-steel gear train. The coreless motor delivers faster response and longer life than brushed alternatives, while the 2 µs dead band and programmable 180° or 270° travel allow precise setup for steering or control surfaces.

PWM range and voltage compatibility

Your controller must output a 500–2500 µs pulse width at 50–330 Hz to reach the full angular range. The servos operate on 6.0–7.4 V DC, so a 2S LiPo or 5-cell NiMH pack is required; verify your receiver and BEC can supply adequate current for two high-torque units.

Highlights

  • Coreless motor for faster response and longer life
  • Up to 40 kg·cm stall torque at 7.4 V
  • IP66 waterproof and dust-tight for off-road use
  • Double ball bearings with 373:1 metal gear train
  • 180° or 270° travel via 500-2500 µs PWM

Specifications

BrandJUSHIDE
Model NumberJS6640
TypeGyros
Size/Dimensions40 mm x 20 mm x 40.5 mm
Length40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In)
Width40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In)
Height40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In)
Weight0.168 kilograms
Voltage Range7-8.4
FeaturesMetal, 40KG*2Pcs -180° Angle, 40 X 20 X 40.5 Mm (1.58 X 0.79 X 1.60 In), no_warning_applicable
Torque40KGF.CM

Questions about this item

How often should I inspect or replace the stainless steel gears in the JS6640 servos?

The 373:1 metal gear train uses high-precision stainless steel gears and double ball bearings designed for minimal backlash and long life; inspect for wear after heavy use, but no fixed replacement interval is defined.

What limits continuous operation of the JS6640 when running at 7.4 V?

At 7.4 V the coreless motor delivers 40 kg·cm stall torque with a 0.17 s/60° speed; the IP66 seals and aluminium centre case handle heat and dust, so the practical limit is the 373:1 gear train's thermal capacity under sustained load.

How much noise and heat do the JS6640 servos produce during all-day running?

The coreless motor and stainless steel gear train are specified for low noise; the CNC aluminium middle shell and double ball bearings dissipate heat, while the IP66 waterproof seals add no extra friction during extended operation.

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