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

Compact shaft collar for model helicopters

This Hirobo HI2521093 collar is an RC-scale shaft collar designed for use in model helicopter assemblies when a small retention or alignment element is required. The designation in the part name indicates the nominal sizing, and the collar serves as a mechanical stop or locator on shafts within rotor and drivetrain subassemblies.

For installation, position the collar at the required axial location and secure it using the set-screw or clamping feature supplied on the part. Verify axial clearance and shaft runout before final tightening, use the correct hex driver and controlled torque, and consider a light application of thread locker when extra vibration resistance is needed.

As an accessory for RC builds, the collar helps reduce lateral play in shaft assemblies, maintains component alignment, and supports consistent control geometry during setup and tuning. Always confirm the collar fits the shaft diameter referenced by the part code and the mating components on your model prior to installation.