Hirobo HI2521144 COLLAR 2.6 X 3 X 2.9 F5X0.5  [HI2521144]

Helicopter collar for precision fit

This collar is an RC-scale replacement part intended for use in Hirobo helicopter general parts assemblies. It serves as a locating and retention component where a tight dimensional fit is required along shafts or within hubs. The part is best considered a small mechanical spacer used during assembly and tuning rather than a load-bearing structural element.

Installation is straightforward for hobby technicians familiar with rotor-head and tail-rotor subassemblies: slide the collar into position on the shaft or within the mating bore, ensure axial alignment, then secure the surrounding fasteners per the original equipment practice. Check for free rotation and correct endplay after assembly to confirm the collar seats correctly.

When tuning rotor assemblies, this collar helps maintain repeatable shaft positioning which can aid in trim consistency and component interchangeability. As with all RC helicopter maintenance, verify fit before flight and inspect for wear during routine service intervals.