Hirobo HI2521142 Collar for Helicopter General Parts 2 x 3 x 3.8 F4X1.3  [HI2521142]

Helicopter collar part

This collar is an RC-scale helicopter general part listed under Hirobo HI2521142, intended as a small locating and retention component for model assemblies. The item name includes dimensional identifiers that help confirm fit during selection, so validate the stamped numbers against the shaft or bore on your model before use.

In practical terms the collar functions as a positional element within a rotor or linkage subassembly, helping to maintain alignment and spacing. When installing, slide the collar into place and secure it using your model's original fastening method, then check for free rotation and correct axial positioning to avoid binding.

Routine inspection is recommended to spot wear, corrosion, or deformation that could affect performance. Replace the collar if signs of significant wear appear to prevent secondary damage to mating parts.