M2-Compatible D3.5 Radius Pin Hirobo HI2525013  [HI2525013]

Precision D3.5 Pivot Pin (M2)

The Hirobo D3.5 radius pin, model HI2525013, is an RC-scale spare made for M2-compatible linkages and small pivot points used in model helicopters and similar builds. It is intended to match mating pivots where a D3.5 radius is required while preserving original linkage geometry.

Installation is generally simple: extract the damaged pin, check that the M2 thread or bore corresponds to the replacement, and press or slide the new pin into place until secure. Confirm the pin rotates freely and that surrounding parts have correct clearance. Typical hobby hand tools are sufficient for the job.

When setting up linkages, this pin keeps pivot alignment correct while allowing the intended movement. Fit it as a direct swap when the specification calls for a D3.5 radius pin for M2 fittings and perform initial checks to prevent binding or slack.