RC Helicopter Needle Pin 3 x 21.8 - Hirobo HI2509006  [HI2509006]

Needle pin for helicopter linkages

This Hirobo HI2509006 needle pin is a compact retention fastener sized 3 x 21.8, intended for RC helicopter component assemblies where that dimension is specified. It is used to locate and retain linkage ends, small brackets, and other fitted parts to keep assemblies secure during operation.

Installation notes: check the mating bore diameter and fit tolerance before fitting, ensure the pin seats fully without binding, and use the appropriate retaining method for the assembly (for example, circlip or set screw where applicable). Do not force an oversized pin into an undersized hole to avoid deformation.

Tuning and maintenance: examine the pin regularly for signs of wear, bending, or surface damage after flights, particularly in control linkages where any play affects handling. Replace pins that show visible wear rather than attempting to reform or reuse compromised components.