This C-clip set was produced to mate with HK-50 series outrunner motors commonly used in RC applications. The components serve to retain the endbell and rotating parts axially so assemblies stay correctly located during running and repair.
Apply the clips only where the motor shaft features a machined groove intended for snap-fit retention; these parts act as low-profile axial retainers, not as bearings or spacers. During service, slide the clip into the shaft groove after removing the endbell, then fit the endbell back and check for free rotation with no side-to-side movement.
Regular inspection and correct installation help preserve motor alignment and reduce axial wear that can affect gear mesh and bearing service life in RC builds.
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