Hirobo HI2506011 Flat Washer 3.5 x 9 x 1T, RC helicopter flat washer part  [HI2506011]

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 labeled dimensions 3.5 x 9 x 1T serve as the reference for matching fasteners and mating components in small-scale rotor systems.

Functionally, a flat washer of this profile provides even load distribution under screw heads or nuts and helps control lateral play in linkages and rotor fittings. In model helicopter assemblies, washers of the correct diameter and thickness are useful for fine clearance adjustments and for preventing metal-on-metal contact that accelerates wear.

Installation tips: check that the washer's central hole aligns with the shaft, pin, or screw being used, confirm the outer diameter clears neighbouring parts, and fit it in the stack before tightening to the final torque to preserve the intended spacing. Replace any washer that shows visible deformation, corrosion, or flattening that alters its thickness.

Tuning role: use this washer as a simple shimming tool when adjusting blade pitch control geometry, rotor head preload, or small linkage endplay; swapping to a washer with the correct thickness can remove slop without changing fixed hardware.