Hirobo HI2521110 Collar 5 x 7 x 5 for RC helicopter linkages  [HI2521110]

Collar for RC helicopter shafts

This Hirobo HI2521110 collar is an RC-scale accessory sized 5 x 7 x 5 intended for use on model helicopter shafts and linkages. The part functions as a locating collar to help position and retain components along a shaft, contributing to consistent alignment within the rotor train or tail assembly.

Installation is straightforward: slide the collar onto the shaft to the required position, then secure using the model’s existing retaining method or compatible fastener. The collar’s role is positional rather than structural, so ensure it seats snugly against the mating surface to avoid axial play.

In tuning and setup, collars like this are useful for setting trim points, defining travel limits for linkages, and restoring concentricity after component replacement. Routine checks for movement and correct seating are recommended as part of pre-flight inspection.