Hirobo HI2521143 2 x 3.5 x 3 Precision Collar for RC Helicopters  [HI2521143]

Small replacement collar for helicopter shafts

This Hirobo collar is an RC-scale general replacement part listed as HI2521143, intended for use in helicopter assemblies where a small collar locates or retains shafts and linkages. The nominal size 2 x 3.5 x 3 makes it straightforward to match the collar to shafts or components that call for that dimension.

Installation is simple: position the collar on the shaft at the required spot, confirm alignment with adjacent parts, then secure with the appropriate set screw or compatible fastener referenced in your model's parts list. Recheck free movement and clearance before flight to avoid binding.

In setup and tuning, collars like this lock exact positions on control linkages and rotor parts, allowing repeatable adjustments during bench work or field trimming. Keep spares on hand for quick swaps during maintenance.