SDX SCEADU SZ-5 4mm Blade Spacer for Rotor Heads - Hirobo HI0412329  [HI0412329]

Precision 4mm Rotor Blade Spacer

This spare part is an RC-scale blade spacer designed to sit between rotor blade and hub components, keeping a consistent 4mm separation where required by SDX, SCEADU and SZ-5 rotor assemblies. The spacer's role is strictly mechanical, delivering repeatable spacing to assist blade pitch setup and balance checks.

Installation is straightforward for hobbyists familiar with rotor head work: remove the blade retaining hardware, place the spacer at the blade root or on the shaft as your rotor design requires, then reassemble and torque to the original specifications. Ensuring clean contact surfaces and correct thread engagement helps preserve alignment and minimize runout.

When tuning, this spacer helps keep blade geometry consistent across both blades, supporting predictable pitch response and reducing asymmetric vibration that can undermine stability. Always verify blade tracking and rotor balance after fitting and make small pitch adjustments using your swashlink or blade grips if needed.