Scorpion HK-4525 Motor Shaft Kit (XL/55mm)

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Scorpion HK-4525 Motor Shaft Kit (XL/55mm)

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The Scorpion HK-4525 motors are built with 10mm 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-4525 series Scorpion Helicopter Motors.

This extended shaft for the HK-4525 series motors measures 10mm in diameter where it goes through the motor bearings, and is 112.3mm long overall. The pinion end of this shaft is ground down to 6mm to allow the user to install 6mm pinion gears, and extends 55mm out past the mounting face of the motor. The shaft kit will also fit other brushless motors that require a 10mm shaft of this length. The shafts can be cut shorter with a Dremel tool and a cut-off wheel if necessary to fit other motors.

Note: The shafts in Scorpion motors are a slight press fit into the aluminum front housing. The shafts will not just slide out when the setscrews 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.

Product Questions


I have a Gaui X7 kit that I will be building soon and I need to know which main shaft must I use that will go into the third bearing block on the X7 with my Ultimate HK-4525-520KV.

Thank you very much for your honesty and reply.


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