4 x 5 x 6.5 mm Shaft Collar HI2521067 for RC Helicopters Hirobo  [HI2521067]

4 x 5 x 6.5 shaft collar for rotor spacing

This collar is an RC-sized shaft component stamped 4 x 5 x 6.5 and intended as a general-purpose element for model helicopters. It functions as a spacer and axial locator on small shafts where consistent spacing and repeatable blade position matter for rotor balance and control link geometry.

To fit, slide the collar to the required point on the shaft and secure it following the shaft and hub method used on your model. The collar's nominal dimensions are meant to work with small rotor assembly interfaces; always confirm fitment before locking components into place to prevent interference.

As part of routine tuning and maintenance, this collar lets you adjust blade tracking and retain head geometry after component swaps. Keep spare collars on hand for rebuilds and trial setups where millimetre-level spacing adjustments alter rotor behaviour.