HIROBO HI2521058 Collar 4 x 6 x 5 for RC helicopters  [HI2521058]

RC helicopter collar for rotor and linkage

This HIROBO collar is an RC-scale accessory identified by model HI2521058 and the 4 x 6 x 5 designation, intended for use in Hirobo helicopter assemblies where small positional spacers or collars are required.

The part functions as a locating collar to control axial position and clearance of rotor components and linkage interfaces. In typical installation it is positioned on the shaft or within a linkage bore to set consistent spacing; final retention and fastening should follow the helicopter kit or service manual hardware practice.

For fit and tuning, confirm the 4 x 6 x 5 geometry matches the mating shaft or bore, check alignment under free rotation, and verify there is no unwanted binding before flight testing. This component is presented as a straightforward replacement or maintenance item within general Hirobo helicopter parts.