D3.5 Pivot Pin for M2 Linkages - Hirobo HI2525013  [HI2525013]

M2 Linkage Pivot: D3.5 Radius

The Hirobo HI2525013 D3.5 radius pin is a compact replacement component designed for M2-compatible linkages and small pivot points in model helicopters and related assemblies. It helps maintain intended linkage geometry while providing the required D3.5 pivot surface.

To fit the pin: remove the existing worn part, check that the M2 thread or bore aligns with the replacement, and press or slide the new pin into place until it is secure. Confirm that the pivot turns freely and that there is adequate clearance before returning the model to normal operation. Standard hobby tools are adequate for this task.

In tuning, this pin plays a direct role in preserving control linkage geometry while permitting the expected pivot movement. Use it as a like-for-like replacement when a D3.5 radius pin for M2 fittings is specified, and validate fit during initial tuning runs to avoid binding or unwanted play.