5 x 8 x 11.5 Hirobo HI2521127 Linkage Collar for RC Helicopters  [HI2521127]

Linkage spacer for small-scale helicopters

This component, the Hirobo HI2521127 collar stamped 5 x 8 x 11.5, is made to serve as a small spacer inside helicopter linkage and shaft assemblies. It functions to set and maintain precise axial spacing where parts meet.

Fit the collar to maintain alignment between control links and short shaft sections, reduce side play at junctions, and protect mating parts from uneven wear. Consider it a consumable part to check during teardown and servicing.

Installation notes: verify the dimension match with the shaft and mating bore before final assembly, check for smooth rotation after fitment, and replace if visible wear or deformation appears. Focus on correct sizing to avoid introducing binding or excess play.