Blade Holder Bearing Collar 9x11x5 for Hirobo Helicopters - HI2521054  [HI2521054]

Hirobo rotor collar for precise bearing seating

This RC-scale bearing collar is produced for use in Hirobo helicopter blade holder assemblies. The 9x11x5 mm sleeve acts as a locating and retention component around the bearing area, securing the blade hub while allowing smooth bearing rotation under operational loads.

Hobbyists and tuners fit this collar where exact bearing seating affects blade tracking and pitch response. It is commonly used as an economical replacement for collars that have worn and now permit excess play or irregular blade runout.

Installation notes: make sure the bearing is correctly seated before applying the collar, clean the mating surfaces, and slide the collar on carefully to avoid damaging bearing races. After installation, check for axial and radial play and confirm blade tracking at low throttle prior to flight.

Tuning role: correctly fitted collars support steady blade alignment, aiding predictable pitch changes and improving cyclic smoothness which helps reduce repeated trim adjustments during setup.