Hirobo HI2521098 Collar 3 x 8 x 2 Blue RC shaft collar  [HI2521098]

Shaft collar for RC helicopters

This Hirobo HI2521098 collar is a compact RC-scale shaft collar identified by its 3 x 8 x 2 marking and blue finish. It is intended as a small locating and securing part for hobby helicopter assemblies where precise axial positioning of shafts or linkages is required.

Use notes: the sizing indicates an inner diameter suitable for a 3mm shaft, an outer profile around 8mm and a 2mm width, which makes the part useful for holding small gears, spacers or control link components on model rotor and tail shafts. The blue appearance helps visually confirm placement during assembly or maintenance.

Installation and tuning role: fit the collar onto the intended shaft and position it to stop axial movement of the target component, then secure according to the collar’s fastening method. When tuning a rotor head or tail assembly, collars like this act as simple mechanical stops that help maintain trim and reduce endplay without affecting bearing alignment.