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

Locating collar for helicopter linkages

This collar is an RC-scale accessory intended for use in helicopter general parts where a compact locating sleeve is required. The 3.1 x 6 x 10 marking indicates the nominal sizing used to match shaft and linkage tolerances in small helicopter builds and component repairs.

Installation is straightforward: slide the collar onto the mating shaft or post to set axial position, then secure adjacent fasteners or set screws as the original assembly specifies. The part functions as a positional stop and spacer in linkage stacks, blade grips, and similar sub-assemblies where controlled clearance matters.

In tuning and maintenance, collars help maintain repeatable spacing during setup and after component replacement. Use this part when restoring original geometry or when stabilizing linkage clearance to reduce play that can affect rotor tracking and cyclic response.