HIROBO HI2521060 Collar 2 x 3 x 1.2, RC helicopter shaft collar  [HI2521060]

Collar for Hirobo helicopters

This HIROBO HI2521060 collar is a compact RC-scale shaft collar intended for general parts maintenance on Hirobo helicopter models. Its designation 2 x 3 x 1.2 communicates the collar's nominal dimensions used to position and retain small shafts and linkage rods in subassemblies.

In practice the collar functions as a locator and anti-axial movement device, keeping servos, bellcranks, and small rotating shafts correctly indexed. Because it is an accessory-level part, its main role is to reduce axial play and help maintain geometry during tuning and minor repairs.

Installation is straightforward: slide the collar onto the shaft to the desired position, align with mating parts, then secure using the existing set screw or fastening method used on the model. Avoid over-torquing the set screw to prevent shaft damage, and check runout after installation when tight tolerances are required for rotor or tail assemblies.

The collar is intended for model-level repairs and adjustments; it is described and used strictly as an RC-scale accessory.