Hirobo HI2521108 Collar 3 x 4 x 5.1 mm for Hirobo Helicopter General Parts  [HI2521108]

Precision shaft collar for Hirobo rotors

This Hirobo HI2521108 collar is a compact RC accessory designed for use within Hirobo helicopter general parts. It acts as a shaft collar to secure components axially on model shafts, helping keep rotating parts aligned with nearby assemblies.

Installation is straightforward: place the collar at the chosen shaft location and fasten it to stop axial movement. It is commonly used as a compact, repeatable stop between bearings, gears, or hub components. Always confirm fitment before making modifications.

When adjusting rotorhead or tail linkages, collars like this one lock small positional tweaks and help preserve trim between flights. Regularly inspect for wear and ensure fastenings remain secure to keep assemblies stable through flight cycles.