Hirobo HI2521145 Small Shaft Collar for Helicopter Linkages  [HI2521145]

Precision positioning collar for small shafts

This Hirobo collar functions as a general RC helicopter part used to establish and hold spacing within rotor and control link systems. The 2 x 3 x 6 dimension refers to the nominal collar sizing for positioning on shafts or inside compact housings.

Use the collar to control endplay and to create a repeatable seating surface for nearby components. Before installing, inspect the shaft and bore for roughness and ensure the collar seats squarely to prevent uneven loading that can introduce vibration.

When trimming and tuning controls, consistent collars like the HI2521145 reduce the need for makeshift shims and help preserve measured geometry across test flights.