Hirobo HI2506065 Thin Flat Washer 4.1 x 5.1 x 0.1T for RC Helicopter Use  [HI2506065]

Uses and fitment guidance

The Hirobo HI2506065 flat washer is a slim spacer for use in helicopter and general RC component assemblies. The marking 4.1 x 5.1 x 0.1T indicates the inner diameter, outer diameter and nominal thickness, so it is useful when minimal material thickness is needed to adjust fit or improve alignment between parts.

For tuning and maintenance the washer functions as a micro shim: adding or removing a single 0.1T disc can change shaft endplay, alter bearing preload, or refine gear mesh in small increments. As a flat washer it helps maintain uniform contact across a bearing seat or fastener head, reducing lateral play and distributing loads.

Fitment advice: treat the washer as a precision spacing part, confirm correct orientation where needed, and only stack washers in line with the assembly tolerances. When seeking a tighter fit, make small incremental adjustments to preserve component alignment and drivetrain balance.