3.5 x 9 x 1T Flat Washer for RC Helicopters - Hirobo HI2506011  [HI2506011]

3.5 x 9 x 1T flat washer for model helicopters

This is a standalone replacement flat washer for RC helicopter assemblies, catalogued as HI2506011. The marked size 3.5 x 9 x 1T provides the measurements to match bolts, pins and mating fittings in compact rotor assemblies.

A washer of this type evens out clamping forces under head or nut contact and helps limit lateral movement in linkages and rotor fixtures. Choosing the right diameter and thickness allows precise clearance control and reduces metal-on-metal contact that can accelerate wear.

Installation advice: confirm the washer's centre hole matches the shaft or pin diameter, make sure the outer diameter does not interfere with adjacent components, and fit it into the stack prior to final tightening so spacing is preserved. Discard washers with visible distortion, rust, or reduced thickness.

Tuning role: use the washer as a shim to fine-tune blade pitch linkage geometry, set rotor head preload, or eliminate small endplay; changing to the correct thickness can remove play without modifying permanent parts.