Hirobo HI2521055 Shaft Collar 3.1 x 6 x 10  [HI2521055]

Shaft collar for rotor component alignment

This collar functions as a locating sleeve in RC helicopter general parts where a compact axial stop is required. The 3.1 x 6 x 10 notation provides the nominal sizing reference to align with shaft and linkage tolerances in small helicopter assemblies and maintenance tasks.

To install, slide the collar onto the mating shaft or post to establish the desired axial position, then secure any adjoining fasteners or set screws per the original layout. It serves as a spacer and positional stop in linkage stacks, blade grips, and similar sub-assemblies where controlled clearance is necessary.

When tuning or performing upkeep, collars maintain repeatable spacing after replacement of parts. Fit this collar to recover the intended geometry or to reduce play that can impact rotor tracking and cyclic behaviour.