The Scorpion HK-4025, HKIII-4025 & HKIV-4025 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-4025, HKIII-4025 & HKIV-4025 series Scorpion Helicopter Motors.
The shaft for the HK-4025, HKIII-4025 & HKIV-4025 series motors measures 8mm in diameter, and is 83.7mm in long. The Stock HK-4025, HKIII-4025 & HKIV-4025 motors have a 6mm output shaft end on them to allow the user to install 6mm pinion gears. This shaft kit is designed with a 6mm output end for those helicopters that have the stock pinion gears with a 6mm inner bore. The shaft kit will also fit other brushless motors that require an 8mm shaft of this length with a 6mm end. 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 the 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.