Hirobo HI2521093 Shaft Collar 2.6 x 4 x 9F - Shaft Retainer for RC Helicopters  [HI2521093]

Helicopter shaft retention collar

The Hirobo HI2521093 collar is built as a small but precise retention component for model helicopter shafts, acting as a stop or locator within rotor and drive subassemblies. Its part code denotes the size information for matching to shaft diameter.

Fitting is straightforward: move the collar to the desired axial position, align with adjacent components, then secure using the provided set-screw or clamp feature. Use the correct hex tool and controlled torque values, and check for smooth rotation and clearance after installation. A small amount of thread locker can be used if extra resistance to vibration is required.

As an aftermarket accessory, this collar contributes to stable control geometry and predictable drivetrain alignment. Before final fitment, confirm the sizing against your model's shaft and mating parts to avoid fit issues.