Hirobo HI2521105 Collar 3 x 4-6 x 17 Service Part for RC Helicopters  [HI2521105]

Helicopter shaft collar — compact locating component

This Hirobo HI2521105 collar is supplied as a compact service part with dimensions 3 x 4-6 x 17. It secures axial position on rotating shafts and assists in maintaining correct geometry during repairs and tuning tasks.

Intended for use in Hirobo maintenance and rebuild routines, the collar helps control small axial movement and acts as a straightforward replacement for worn locating parts. It is presented as a service component rather than a standalone mechanical unit.

Fitment notes: slide the collar into place at the required shaft position and clamp without over-tightening to prevent damage; confirm running clearance after fitting and check rotor alignment under low-speed checks before normal operation. For trim adjustments, use the collar to lock the chosen position and verify stability through repeated test flights.