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

D3.5 Radius Pin for M2 Linkage Points

This D3.5 radius pin from Hirobo is an RC-scale replacement intended for M2-compatible linkages and small pivot points on model helicopters and comparable assemblies. The design helps retain correct linkage geometry while providing a compact pivot interface where a D3.5 radius is specified.

Fitting the part is straightforward for workshop use: remove the worn pin, confirm the M2 thread or bore matches, then press or slide the replacement pin into position until it seats. Verify free rotation and correct clearance before reassembling surrounding components. No special tools are usually required beyond basic hobby hand tools.

In setup and tuning the pin plays a small but important role by maintaining geometry while allowing the intended pivot motion. Use this as a direct replacement when the original specifies a D3.5 radius pin for M2 connections and run initial tests to ensure there is no binding or excess play.