Hirobo HI2521127 Collar Spacer 5 x 8 x 11.5 for RC Helicopter Linkages  [HI2521127]

Precision collar for rotor head linkages

This Hirobo HI2521127 collar is a compact RC helicopter component marked 5 x 8 x 11.5 and intended as a general-purpose spacer within linkage and shaft assemblies. It serves as a collar to control axial position and ensure proper spacing where an exact dimensional fit is required.

Use this collar to preserve alignment between links and short shaft sections, keep axial spacing consistent, and reduce lateral play at connection points. Treat it as a replaceable service item and inspect whenever you remove rotor head or tail components.

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. Keep the focus on fit and alignment rather than altering the core control geometry.