Hirobo HI2525013 D3.5 Radius Pin for M2  [HI2525013]

D3.5 radius pin for M2 linkages

This D3.5 radius pin from Hirobo is an RC-scale replacement pin designed for M2-compatible linkages and small pivot points on model helicopters and similar assemblies. The part focuses on retaining linkage geometry and providing a compact pivot interface where a D3.5 radius is required.

Installation is straightforward for model workshop use: remove the worn pin from the linkage, verify M2 thread or bore fit, and press or slide the replacement pin into position until secure. Check for free rotation and correct clearance before reassembling surrounding parts. No specialty tools are required beyond common hobby hand tools.

In tuning and setup, this pin serves a simple but important role: keeping linkage geometry stable while allowing the intended pivot motion. Use it as a direct replacement when the original part is specified as a D3.5 radius pin for M2 connections, and verify fit during initial test runs to avoid binding or excess play.