12 x 18 x 1 Shaft Collar for RC Helicopters - Hirobo HI2521136  [HI2521136]

Overview of the shaft collar role

This Hirobo collar (model HI2521136) serves as a compact retaining accessory for use with Hirobo helicopter general parts. The 12 x 18 x 1 measurement makes it appropriate where a slim collar is needed on rotating parts of model helicopters.

It functions as an axial stop and alignment aid, helping to limit endplay and maintain concentric alignment between shafts and mating components. This item is intended for model helicopter systems and not for full-size equipment.

Fitting guidance: slide the collar to the required axial location and secure it according to your helicopter's retention method. Examine mating surfaces for burrs or wear prior to fitting to prevent misalignment. After fitting, check the rotor assembly for runout or binding.

Use in setup: employ this collar to set or refine axial positions for gears and bearings when small adjustments are required to improve alignment or reduce endplay. Make measured adjustments and validate results with slow bench checks before flight.