Hirobo HI2521129 3 x 8 x 3 Collar - Fitment and Compatibility for Helicopter Parts  [HI2521129]

Compatibility and Fitment Notes

The Hirobo HI2521129 collar is an RC-scale locating sleeve sized 3 x 8 x 3, intended to maintain axial spacing on small shafts and linkages in helicopter assemblies. It is a positional component that assists with accurate alignment rather than replacing bearings for load support.

Confirm correct fit by measuring shaft diameter and checking the collar bore against the mating part before installation. Slide the collar to the required position and secure adjacent hardware according to the model's assembly method, ensuring no interference with rotating elements.

When swapping collars between models, verify that bore and outer dimensions match to avoid loose fit or binding. Replace any collar that shows looseness, cracking or other signs of mismatch to preserve control accuracy and safe operation.