Rotor Head 4mm Blade Spacer Compatible with SDX SCEADU SZ-5 - Hirobo HI0412329  [HI0412329]

Spacer Component for Blade Roots

This replacement spacer fits between the rotor blade and hub components to maintain a controlled 4mm gap where SDX, SCEADU and SZ-5 assemblies specify it. Its function is mechanical: to establish consistent spacing that aids in setting blade pitch and achieving balance.

Fitting is typical of rotor head maintenance: remove the relevant blade fastenings, fit the spacer on the blade root or shaft as required by your head configuration, then reassemble and tighten to the recommended torque. Keeping the mating surfaces clean helps ensure accurate seating and reduces potential runout.

When tuning, the spacer maintains comparable blade geometry across both blades, which supports predictable control response and reduces uneven vibration. After installation, recheck tracking and balance and perform small pitch corrections with your blade grips or swashlink where necessary.