Hirobo HI2521076 Collar 3 x 6 x 17 mm Helicopter Part  [HI2521076]

Precision spacer for rotor assemblies

The Hirobo HI2521076 collar is a compact 3x6x17 mm locating ring for RC helicopter assemblies. It functions as a simple mechanical spacer that secures axial position in small shafted subassemblies common to hobby helicopters.

Fitment is straightforward: confirm shaft size and bore tolerance, use a steady press or gentle tapping to seat the collar, and recheck alignment after fitting. By keeping components at the correct spacing the collar reduces lateral play and helps maintain consistent tracking.

During service intervals handle and inspect the collar for signs of wear, deformation, or surface corrosion and replace it when fitment or roundness is affected to retain reliable shaft operation.