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

Blade holder collar for Hirobo helicopter assemblies

This is an RC-scale blade holder bearing collar made for installation in Hirobo helicopter blade holder assemblies. The 9x11x5 mm sleeve locates the bearing used in the main rotor hub and helps secure the blade while allowing the bearing to turn freely under load.

Modelers and workshop technicians install this collar where accurate bearing seating changes blade tracking and pitch response. In routine maintenance it is a cost effective replacement when worn collars produce excess play or uneven blade runout.

Installation notes: confirm the bearing is fully seated in the blade holder before fitting the collar, clean mating surfaces of debris and contaminants, and slide the collar into place without forcing it to avoid deforming the bearing races. After fitting, inspect axial and radial play and verify blade tracking at low throttle before flight.

Tuning role: a properly seated collar keeps blade alignment consistent, which supports predictable pitch changes and smoother cyclic response, reducing the need for repeated trim corrections during setup.