Hirobo HI2521063 Collar 3 x 7 x 15.5 Precision Spacer for Shafts  [HI2521063]

Precision Collar for RC Linkages

This Hirobo collar is an accessory intended to position or space components along a shaft in helicopter and related model assemblies. The product is listed under model HI2521063 and carries the 3 x 7 x 15.5 size notation included in the title.

It provides a compact axial stop where precise separation between rotating elements or linkages is required. Always double-check fit and clearance on the intended shaft before completing installation to prevent binding or misalignment in the drive or control systems.

Fitting guidance is simple: confirm the collar sits squarely and that mating parts keep correct alignment. Tiny adjustments to the collar location will change shaft endplay and spacing, so work in small steps and re-evaluate free movement once fitted.