Hirobo HI2509021 1.5 x 7.8mm Needle Pin for Linkage Retention  [HI2509021]

Precision needle pin for control linkages

The Hirobo HI2509021 needle pin is a compact 1.5 x 7.8mm replacement designed for small helicopter linkages and similar RC assemblies. It functions as a locating and retention element to secure clevises, linkage arms, and other small alignment points.

When installing, focus on correct fit and alignment rather than force: check bore clearance, remove any burrs, and ensure the pin seats fully without lateral play. During setup and trimming these pins act as low-profile pivots that stabilise geometry while allowing intended rotational movement at the joint.

Inspect pins periodically for bending, surface wear, or corrosion and replace any that show deformation, since a compromised pin can introduce slop and affect control trim.