Product overview
The Scorpion HKIII-4020 Shaft Kit (5mm 31mm) provides a replacement shaft for motor repair after bending or breakage. It is a motor component kit, with one HKIII-4020 motor shaft identified as 5mm, one washer and two C-clips supplied. The stated replacement applications are the HK-4020, HKIII-4025 and HKIV-4025 helicopter motor series. Its physical interface combines an 8mm shaft diameter and 78.7mm overall length with a 5mm output end, allowing installation of 5mm pinion gears on the named stock motors.
Integration into other brushless motors depends on their requiring the same shaft length, 8mm diameter and 5mm end. The shaft can be shortened with a Dremel tool and cut-off wheel when necessary for another motor. Servicing the Scorpion installation requires pressing equipment: the shaft has a slight press fit in the aluminum front housing and does not slide free after the setscrews are removed. Removal requires a bearing press or drill press, with the front housing supported in a block of wood to prevent warping. Weight including packaging is 31.2g.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Scorpion HKIII-4020 Shaft Kit (5mm 31mm) |
| Product type | Factory replacement motor shaft kit for Scorpion helicopter motors. |
| Named motor compatibility | HK-4020, HKIII-4025 and HKIV-4025 series. |
| Shaft diameter | 8mm |
| Shaft length | 78.7mm |
| Output shaft end and pinion size | 5mm output shaft end for 5mm pinion gears.Stock HK-4020, HKIII-4025 and HKIV-4025 motors. |
| Other motor fit | Fit is conditional on the required shaft dimensions.Other brushless motors requiring an 8mm shaft, 78.7mm long, with a 5mm end. |
| Length adaptation | The shaft can be shortened using a Dremel tool and cut-off wheel.If necessary to fit other motors. |
| Housing fit | Slight press fit into the aluminum front housing.Shaft installation in Scorpion motors. |
| Removal requirements | Removing the setscrews alone does not release the shaft; a bearing press or drill press is required.During shaft removal, with the motor front housing supported in a block of wood to prevent warping. |
| Motor shaft supplied | HKIII-4020 Motor Shaft (5mm) × 1Included in the box. |
| Washer supplied | Washer × 1Included in the box. |
| C-clips supplied | C-Clip × 2Included in the box. |
| Packaged weight | 31.2gIncluding packaging. |
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