Hirobo HI2521063 Precision Shaft Collar 3 x 7 x 15.5 for Positioning  [HI2521063]

Shaft Collar for RC Helicopter Assemblies

This Hirobo collar is an RC-scale accessory intended to locate or space components along a shaft in helicopter assemblies and similar model setups. It is presented as a simple collar item identified by the model code HI2521063 and the dimensions 3 x 7 x 15.5 shown in the title.

Use this collar where a compact axial stop or precise spacing is required between rotating parts or linkages. As with any shaft collar, confirm fit and clearance on the target shaft before final installation to avoid binding or misalignment within the drivetrain or linkages.

Installation considerations are basic: ensure the collar seats evenly and that any mating parts maintain alignment. For tuning, small changes in collar placement can alter shaft endplay and component spacing, so make incremental adjustments and verify free rotation and linkage geometry after fitting.