Hirobo HI2521067 Collar 4 x 5 x 6.5 mm RC Helicopter Shaft Spacer  [HI2521067]

Precision shaft spacer 4 x 5 x 6.5

This collar is an RC-scale shaft component marked 4 x 5 x 6.5 and designed as a general-purpose part for model helicopters. It acts as a spacer and axial locator on small shafts where repeatable blade position and consistent spacing are important for rotor balance and control geometry.

Fitment is simple: slide the collar along the shaft to the required location and secure according to your shaft and hub arrangement. The nominal dimensions aim to match small rotor interfaces; always confirm physical fit before final assembly to prevent interference with bearings or nearby hardware.

For tuning and maintenance, this collar provides an easy method to tweak blade tracking and preserve head geometry after component swaps. Keep spare collars for rebuilds and setup trials where millimetre-level spacing changes affect rotor response.