Hirobo HI2521102 Shaft Collar 5 x 8 x 3.5 for RC Helicopter Parts  [HI2521102]

Model helicopter shaft locator collar

The HI2521102 collar from Hirobo is supplied as an item in the helicopter general-parts range, clearly marked 5 x 8 x 3.5. It is intended as a small mechanical collar used to locate rotating shafts or retain spacers in model helicopter assemblies, without implying fitment beyond the manufacturer's general parts category.

For installation, slide the collar to the designated axial position on the shaft and secure the surrounding hardware to remove unwanted play. As a component-level accessory, confirm size compatibility with your shaft and follow the fastening recommendations found in the aircraft's parts listing or service instructions.

When performing maintenance or adjustments the collar can be used to set axial spacing between bearings or gears and to reinstate proper shaft alignment after servicing. Make sure the component is clean and verify rotational clearance to avoid binding inside the rotor or transmission train.