Hirobo HI2521134 3 x 6 x 12.25 Shaft Collar for RC Helicopters  [HI2521134]

Precision Shaft Collar for RC Helicopters

This RC-scale collar is a general-purpose replacement listed under Hirobo helicopter general parts. The HI2521134 designation identifies the 3 x 6 x 12.25 collar used where axial location and concentric alignment of rotating components are critical.

In service the collar acts as an axial stop and an alignment sleeve within transmission or rotor assemblies. For maintenance or replacement, confirm mating dimensions, thoroughly clean contact faces, slide the collar into position on the shaft or into the housing, and secure it using the model's original retaining method. After fitting, inspect runout and axial play during a routine tuning check to verify smooth operation.