Hirobo HI2521142 Collar, 2 x 3 x 3.8 F4X1.3 — Helicopter Spare Part  [HI2521142]

Service and fitment notes

Listed under Hirobo HI2521142, this collar serves as a small locating and retention piece for RC helicopter assemblies. The dimensional markings printed on the part should be checked against the shaft or bore on your model to confirm correct selection.

The collar acts as an axial locator within rotor or linkage subassemblies, maintaining proper spacing and alignment. To install, slide the collar into position and use the model's existing fastening method to secure it, then verify that the assembly rotates freely and is correctly positioned.

Carry out routine inspections to detect wear, corrosion, or deformation that could impair performance. Replace the collar when wear is evident to avoid collateral damage to adjacent parts.