5 x 6.5 x 15 Helicopter Collar HI2521089 - Hirobo  [HI2521089]

Mounting collar for rotor and tail linkages

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.

Enthusiasts use collars to fine-tune drivetrain geometry, lock component positions, and reduce unwanted axial play. Since attachment and clamp types vary, confirm mating part clearances and shaft dimensions before final installation.

Use this item as a precision assembly piece for maintenance and tuning of helicopter drivetrains and rotor linkages, not for any full-size application.