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

Component description

This collar, identified as Hirobo HI2521142, is intended for use as a locating and retention item in RC helicopter assemblies. Confirm the stamped dimensional identifiers against your model's shaft or bore to ensure a proper match before installation.

In-service the collar provides positional support within rotor or linkage subassemblies to maintain alignment and spacing. Fit the collar by sliding it into place and securing it with the model's original fastening system, then check for smooth rotation and correct axial placement to prevent binding.

Periodic inspection is advised to detect wear, corrosion, or deformation that could degrade performance. Replace the collar if you find substantial wear to protect mating components.