Hirobo HI2506063 4x7x1T Precision Flat Washer  [HI2506063]

Spacing and tuning role

This Hirobo HI2506063 flat washer is an accessory intended for helicopter maintenance and assembly applications. The 4x7x1T label specifies the washer's nominal inner diameter, outer diameter, and thickness as shown by the manufacturer and model number.

Use the washer as a thin spacer or load-bearing shim in rotor linkages, frame joints, and other fastening points where small adjustments affect control feel. In tuning contexts the washer is used to remove play and maintain consistent contact between mating parts while preserving original geometry.

Fitting notes: verify the washer fits the intended bolt or shaft and that it clears surrounding components before final tightening. The washer should lie flat and not bend the fastener; remove and replace any washer that shows wear or deformation to keep assemblies reliable.