Hirobo HI2521096 Shaft Collar — Shaft Retainer for RC Helicopters  [HI2521096]

Precision shaft collar for Hirobo rotors

This Hirobo HI2521096 collar is an RC-scale shaft collar intended for use within Hirobo helicopter general parts. It acts as a concise mechanical retainer to hold parts on a shaft and maintain axial location in rotor and drivetrain assemblies. The text below highlights fit notes, installation pointers, and the collar's function during setup and tuning.

Compatibility: the part is listed under Hirobo helicopter general parts, so it is suitable where a matching collar dimension is required in Hirobo rotor and transmission subsystems. Always confirm the physical shaft diameter and surrounding clearance before fitting to ensure proper engagement and no interference.

Installation and service role: place the collar at the chosen axial position on the shaft and secure it so the retained component cannot migrate under load. Common uses include locking gear position, stabilising rotor spacing, and supporting repeatable alignment when adjusting rotor tracking or drivetrain tolerances. Inspect the collar for burrs, deformation, or surface wear during routine checks and replace if fit or clamping is compromised.