Hirobo HI2521075 COLLAR 3 x 7 x 7 for Hirobo Models  [HI2521075]

Component summary for model helicopters

This item is catalogued as a general Hirobo helicopter part and serves as a small shaft collar for locating and retaining components on model rotorcraft. The 3 x 7 x 7 designation identifies the collar size to help confirm fit against the shaft or linkage dimensions required.

Practically, the collar gives a compact mechanical reference to maintain axial position of shafts and linkages during assembly and tuning. Installation normally makes use of the model's existing clamp or fastening method; verify clearance and alignment before completing the fit to prevent binding or unwanted movement.

When applied for tuning and maintenance the collar can function as a spacer or stop to support repeatable blade pitch, swash alignment, and rotor head indexing in combination with the original hardware. Keep the part clean and inspect regularly for wear to preserve consistent operation.