Hirobo HI2521049 RC Helicopter Shaft Collar 5 x 8 x 1.5mm  [HI2521049]

Compact Collar for Rotor Shafts

This small shaft collar is made for RC-scale helicopter assemblies and similar miniature rotary parts. The 5 x 8 x 1.5mm sizing denotes the bore, outer diameter and thickness, so it is chosen when limited axial spacing or a defined shaft stop is needed.

Functionally the collar establishes a consistent stop and a repeatable reference point for shafts and linkages. It assists in keeping stack-up consistent among gears, bearings and spacers, which helps control play and preload during setup.

Fitting is straightforward: slide onto the shaft to the required position and secure per your model's recommended practice. When tweaking rotorhead settings or bearing preload, use the collar as a locating element and recheck axial clearance after final tightening.

Practical advice: confirm the bore matches your shaft before installation, deburr mating surfaces where necessary, and re-inspect alignment after a short test run. The description is intended for hobby model applications only.