3x6x2.5 Ball Bearing Collar HI2521027 for RC Helicopters - Hirobo  [HI2521027]

3x6x2.5 bearing spacer for rotor heads

The Hirobo collar is a compact spacer designed to locate 3x6x2.5 mm ball bearings in helicopter linkages and compact rotating subassemblies. As a simple mechanical part it limits axial play where bearings interface with shafts or housings, useful when you are rebuilding head assemblies or replacing worn link pivots.

Fitting is simple: ensure the bearing dimensions match 3x6x2.5 mm, place the collar so it seats against the bearing race or housing face, and then confirm unobstructed rotation plus correct axial clearance. Always measure bearing diameters and the mating shaft or bore for a confident fit.

In rebuilds and tuning the collar acts to stabilise bearing location, which can decrease endplay and improve repeatability of link movement following maintenance.