Hirobo HI2521092 5 x 13 x 16 Collar for RC Helicopter Shafts  [HI2521092]

Helicopter Shaft Collar Overview

Intended for Hirobo helicopter components, this collar is labelled 5 x 13 x 16 to indicate its bore, outer diameter, and thickness for fitment checks. These dimensions guide where the collar will sit relative to shafts and housings.

Installation is generally done by experienced builders: the collar acts as a spacer to keep axial alignment and prevent lateral movement between rotating parts and fixed mounts. Ensure the bore matches the shaft to avoid slippage or binding.

When tuning the airframe, small changes in collar placement can influence rotor balance and control linkage geometry; swapping collars of the same size is a simple tuning step before considering larger hardware changes.