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Scorpion HK / HKIII / HKIV 4020 series Motor Shaft Kit - 5mm Pinion Shaft

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Product Description

Scorpion HK / HKIII / HKIV 4020 Motor Shaft Kit - for 5mm Pinion

  • USE FOR: HK / HKIII / HKIV 4020 series Scorpion Helicopter motors.
  • Note for Gaui X5 pilots,, this is also a direct replacement for the GAUI X5 Stock 4020-910kv motor.

The Scorpion HK-4020, HKIII-4020 & HKIV-4020 motors are built with 8mm hardened steel shafts that will last through countless hours of flying fun, but occasionally, on a "Less than Perfect" landing, you may bend or break one. For these occasions, we offer factory replacement shafts for all the HK-4020, HKIII-4020 & HKIV-4020 series Scorpion Helicopter Motors.

This shaft for the HK-4020, HKIII-4020 & HKIV-4020 series motors measures 8mm in diameter, and is 78.7mm in long. The Stock HK-4020, HKIII-4020 & HKIV-4020 motors have a 5mm output shaft end on them to allow the user to install 5mm pinion gears. The shaft kit will also fit other brushless motors that require an 8mm shaft of this length with a 5mm end. The shafts can be cut shorter with a Dremel tool with a cut-off wheel if necessary to fit other motors.

Note: The shafts in the Scorpion motors are a slight press fit into the aluminum front housing. The shafts will not just slide out when the set screws are removed. They need to be pressed out in a bearing press, or in a drill press, with the front housing of the motor supported in a block of wood to prevent warping the front housing. Never tap the shaft out with a hammer. The shock induced can bend the motor parts and knock the glue joints loose on the motor magnets.


Included (also pictured above):

- 4020 series hardened steel OEM Motor Shaft (5mm) x1

- Washer x 1

- C-Clip x 2

- Grub/Set Screw x 2

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