3 x 7 x 6 Hirobo HI2521010 Retaining Collar for Helicopter Linkages  [HI2521010]

Compact Collar for Model Helicopters

The Hirobo HI2521010 collar is a small-scale part intended for use in general helicopter assemblies. Marked 3 x 7 x 6, it functions as a retaining device for small control levers and short linkage shafts on model helicopters.

Fitters typically slide this collar onto the shaft, set it where axial retention is needed, and secure it using the host model's preferred fixing method. Its role is to locate linkage pivots and prevent unwanted axial movement in the control train.

During setup the collar helps maintain consistent linkage spacing and reduce endplay, contributing to stable and repeatable control input. Always confirm that adding collars does not introduce binding by cycling controls through full travel after installation.