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

Precision bearing collar for RC helicopter linkages

This compact Hirobo collar is made to locate and retain 3x6x2.5 mm ball bearings in helicopter linkages and small rotating subassemblies. The simple spacer controls axial play where bearings meet shafts or housings, making it a useful item when rebuilding rotor heads and control link pivots.

Installation is straightforward: confirm the bearing matches the 3x6x2.5 mm sizing shown in the product name, position the collar so it seats against the bearing race or housing face, then verify free rotation and correct axial clearance before flight. For fit checks, measure the bearing inner and outer diameters and the mating shaft or bore rather than relying on model numbers alone.

In routine maintenance the collar performs a purely mechanical role, helping maintain consistent bearing position which can reduce unwanted endplay and improve linkage repeatability after servicing.