Hirobo HI2521114 3 x 7 x 17.5mm Collar for RC Helicopter Assemblies  [HI2521114]

This Hirobo collar is an RC-scale replacement part intended for use in helicopter general parts assemblies. The designation 3 x 7 x 17.5 describes the collar's nominal inner, outer or fit-related dimensions used where precise axial location of shafts or small components matters. The piece functions as a mechanical spacer and retention element rather than an active moving part.

For installation: slide the collar onto the shaft to set axial position, check the mating fit against adjacent bearings or hubs, and secure using any existing set screws or retention hardware fitted to your model. Make sure mating surfaces are clean and that the collar does not contact other moving parts before flight.

Tuning notes: use the collar to adjust axial spacing when refining blade tracking, tail link geometry, or gearbox end-play on small helicopters. Make small incremental changes and verify alignment under static and low-speed rotation before full operation.

Packing

• Item supplied as individual collar, sold per piece.