Hirobo HI2521128 Collar 3 x 8 x 15, helicopter general parts collar for shaft alignment  [HI2521128]

Helicopter collar 3 x 8 x 15

This Hirobo collar is an RC-scale helicopter general part identified by the HI2521128 code and the 3 x 8 x 15 marking. It serves as a compact collar component intended for use in model helicopter assemblies where small collars are required to secure or locate rotating and sliding parts.

As a simple mechanical accessory, the collar's role in setup and tuning is to maintain positional stability between mating components in the drivetrain or linkage areas. Installers typically confirm fit by matching dimensions on the model's shaft or linkage, then secure the collar according to the model's original assembly method.

The part is offered as a spare component for routine maintenance or minor adjustments, fitting into the broader category of helicopter general parts rather than a specific chassis kit, so compatibility should be checked against your model's parts list.