Hirobo HI2506011 Flat Washer 3.5 x 9 x 1T RC Helicopter Spacer  [HI2506011]

Replacement flat washer for RC helicopters

This flat washer is supplied as a discrete replacement part for RC helicopter assemblies, identified by the code HI2506011. Its labelled dimensions 3.5 x 9 x 1T act as the specification for matching fasteners and mating components in small rotor systems.

Functionally, a washer of this profile evens out load under screw heads or nuts and helps control lateral play in linkages and rotor fittings. In model helicopter builds, correctly sized washers assist with fine clearance adjustments and prevent metal-on-metal contact that speeds wear.

Installation tips: ensure the washer's central hole aligns with the shaft, pin, or screw being used, confirm the outer diameter clears nearby parts, and place it in the stack before final torque to keep the intended spacing. Replace any washer showing deformation, corrosion, or flattening that changes its thickness.

Tuning role: this washer can serve as a simple shim when altering blade pitch control geometry, rotor head preload, or small linkage endplay; swapping to the correct thickness removes slop without replacing fixed hardware.