Eagle/Freya/EX/SX Ball Radius Pin 5mm - HI0404532 Compatible Part by HIROBO  [HI0404532]

Replacement 5mm ball joint pin for rotor linkages

The 5mm ball radius pin is a replacement part intended for HIROBO Eagle, Freya, EX and SX helicopter platforms. It delivers the pivot interface for ball-head linkages, linking ball cups to rods within the rotor and control mechanism.

Install this pin when a degraded ball connection is producing slop or inconsistent control feedback. It is supplied as a direct replacement in the common parts range for the listed platforms and should be used with the matching ball-head and retaining hardware in the existing linkage.

Fitting guidance: remove the linkage from the airframe to access the joint, check mating surfaces for wear or deformation, and align the pin through the ball-head and linkage eye before securing retainers or fasteners. Confirm smooth operation through the full control arc and replace any worn cups or bearings.

Setup considerations: renewing the ball radius pin removes excessive play and helps maintain steady cyclic and pitch control; because even small joint changes affect feel, adjust trims gradually and perform test flights after installation.