Hirobo HI2521089 COLLAR 5 X 6.5 X 15 - Helicopter Collar Part  [HI2521089]

Helicopter collar component

This HIROBO collar is an RC-scale helicopter general part defined by its 5 x 6.5 x 15 sizing, intended for shaft positioning and alignment tasks in model helicopters. It serves as a small mechanical spacer or locating ring that helps maintain axial position where a matching bore and shaft diameter are used.

Designers and modders use collars like this to control lateral play, register components on a shaft, and provide a simple reference during assembly and setup. Because specific mounting hardware or fit method can vary, verify shaft diameter and mating part clearances before installation.

As an RC accessory, the collar is best viewed as a precision-sized component for assembly, maintenance and fine-tuning of helicopter drivetrains and tail/rotor linkages, not for any full-scale application.