HIROBO HI2521058 4 x 6 x 5 Shaft Collar for Helicopter Assemblies  [HI2521058]

Locator collar for rotor shafts and linkages

This HIROBO collar, model HI2521058 in the 4 x 6 x 5 size, is designed for HIROBO helicopter assemblies that require compact collars or spacers to set component position.

Its function is to act as a locating collar, controlling axial location and clearance for rotor components and linkage interfaces. In practice it is fitted to the shaft or into a linkage bore to create consistent spacing; use the recommended fastening approach from your kit manual for final retention.

For correct setup, check the 4 x 6 x 5 dimensions against the mating shaft or bore, confirm smooth rotation and correct alignment, and inspect for any binding before flight. This collar is offered as a straightforward maintenance or replacement part for HIROBO helicopters.