Hirobo Collar HI2521111 5 x 7 x 13.2  [HI2521111]

Compact aluminum collar for shaft positioning

The Hirobo HI2521111 collar is an aluminium component used to locate and secure linkages on small RC helicopter shafts, matching the 5 x 7 x 13.2 notation in the title. It provides a compact radial stop where precision axial placement is needed.

To fit, slide the collar onto the shaft to establish the desired axial location, then retain it with the model's preferred method such as a set screw, circlip, or adhesive. When tuning rotor play or linkage float, this part helps set consistent movement limits.

Designed for light-duty alignment and service tasks, the collar supports maintenance operations and balancing steps rather than taking heavy structural loads.