Hirobo HI2521046 3 x 5 x 5 Shaft Collar Upgrade for Helicopters  [HI2521046]

Shaft Collar for Tight Helicopter Assemblies

This Hirobo HI2521046 collar is a compact locating piece measured at 3 x 5 x 5. It is used where precise axial placement of shafts or slim components is required in helicopter general parts.

In workshop use, collars of this size are mounted on transmission shafts, linkages or spacer positions to hold parts steady and cut down axial slack. The slim profile fits well into the confined spaces common to electric RC helicopters and similar hobby frames.

Installation is straightforward: verify inner and shaft diameters match, clean contact surfaces, then slide the collar to its intended location. For applications needing a firmer hold use a suitable retention technique while avoiding excess force that might deform the collar.

For tuning, HI2521046 collars help preserve servo-to-link geometry and keep trim settings stable between test flights or bench adjustments. They are an affordable replaceable item that simplifies swapping worn spacers without disturbing core link setups.