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

Shaft spacer for model helicopter assemblies

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.

Builders and hobbyists fit collars to control side-play, register linkages on shafts, and create repeatable reference points for rebuilds. Because attachment styles differ, check shaft tolerance and clearance before pressing or sliding the collar into place.

Consider this collar a precision component for chassis maintenance, rotor and tail linkage setup, and drivetrain fine-tuning in model helicopters rather than any full-scale application.