Hirobo HI2521113 Collar 3 x 6-12-10 x 11.2S RC helicopter shaft collar  [HI2521113]

Shaft collar for model helicopters

This collar is presented as a compact shaft retention part intended for model helicopter use. It serves to secure axial position of small components on shafts and to prevent unintended lateral movement during flight or bench tuning.

Installation is straightforward when matching the collar to a correctly sized shaft and tightening the retaining screw or clamp method used by the design. Check alignment before final tightening and confirm smooth rotation of the shaft after fitting to avoid binding that can affect rotor balance.

In tuning and maintenance the collar functions as a positional stop for linkages and spacers, helping preserve pitch and tail geometry settings. Use it to lock components when adjusting pitch links, replacing small bearings, or setting end-play on rotor and tail assemblies.