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

This Hirobo collar serves as a replacement spacer used in helicopter general parts assemblies. The 3 x 7 x 17.5 sizing identifies the collar's nominal dimensional profile commonly employed where accurate axial positioning of shafts or small components is necessary. It is intended as a passive retention and spacing element.

To fit: slide the collar to the desired axial location, check engagement with nearby bearings or hubs, and secure with any factory set screws or retention hardware present. Clean mating surfaces and verify the collar clears adjoining moving parts before running the model.

Tuning impact: collars let you tweak axial positions to influence blade tracking, tail link geometry, and gearbox engagement. Make conservative adjustments and validate alignment under static and slow rotation before full-speed operation.

Packing

• Item supplied as individual collar, sold per piece.