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

Overview — 5 x 8 x 1.5mm Shaft Collar

This compact collar is an accessory for RC-scale helicopter assemblies and similar miniature rotary components. The 5 x 8 x 1.5mm figures indicate bore, outer size and thickness, so it suits applications where a short axial spacer or fixed shaft stop is required.

The collar functions as a mechanical stop, offering repeatable positioning for shafts and linkages. It supports consistent stack-up among gears, bearings and spacers, which helps maintain expected play and preload when the model is configured.

Fitment is direct: slide the collar onto the shaft to the required position then secure it according to the model's usual practice. Use the collar as a reference when adjusting rotorhead geometry or bearing preload and confirm axial clearance after final tightening.

Before use, ensure the bore matches your shaft diameter, remove any burrs from mating surfaces and re-check alignment following initial trial runs. This description is intended for RC-scale hobby applications only.