HIROBO HI2521058 Collar 4 x 6 x 5 Rotor/Linkage Spacer  [HI2521058]

Precision collar for rotor and linkage control

This HIROBO collar carries model HI2521058 with the 4 x 6 x 5 designation and is intended for use in HIROBO helicopter assemblies where compact positional spacers are needed.

The component serves as a locating collar to set axial position and maintain clearance for rotor parts and linkage interfaces. During installation it is normally placed on the shaft or inside a linkage bore to establish repeatable spacing; final retention hardware should follow the helicopter kit or service manual guidance.

For fit checks and setup, ensure the 4 x 6 x 5 dimensions match the mating shaft or bore, rotate freely to confirm alignment, and verify there is no binding before conducting flight testing. This item is suitable as a direct replacement or maintenance spare among HIROBO helicopter parts.