Hirobo HI2521076 Collar - 3 x 6 x 17 mm Helicopter Component  [HI2521076]

Shaft positioning collar explained

The Hirobo HI2521076 collar, sized 3x6x17 mm, serves as a locating collar for hobby helicopter shafts and small subassemblies. It keeps axial position and aids repeatable alignment in tight mechanical layouts.

For installation, check shaft diameter and bore clearance before fitting, use a controlled press or gentle tapping to seat the collar without deforming it, and verify alignment after fitting. The collar helps maintain correct spacing between gears, pinions, and bearings which supports consistent tracking.

As part of regular maintenance, inspect the collar for wear, corrosion or loss of roundness; replace it when these issues are present to preserve reliable shaft behavior.