The Scorpion HK-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 series Scorpion Helicopter Motors. Our Motor Shaft Kits include an original equipment factory shaft with the setscrew key-ways already cut, a new spacer washer, and a set of 2 retaining clips. This way, when one goes flying and bounces off the wall while you are trying to install it, never to be found again, you still have another one to use!
The shaft for the HK-4025 series motors measures 8mm in diameter, and is 83.7mm long. The Stock HK-4025 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 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. 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.