RC Helicopter Shim Hirobo HI2506065 4.1 x 5.1 x 0.1T Thin Washer  [HI2506065]

Thin shim for model assemblies

The Hirobo HI2506065 flat washer is a purpose-made thin spacer for RC helicopter and general parts assemblies. Marked 4.1 x 5.1 x 0.1T, the label indicates inner diameter, outer diameter and nominal thickness, making it ideal where only a tiny change in material thickness is needed to tweak mating component fit.

As a maintenance tool the washer acts as a micro shim: one 0.1T disc can shift shaft endplay, adjust bearing preload, or fine-tune gear mesh in small steps. Because it is flat, the washer gives uniform contact across a bearing seat or fastener head, helping to equalise load and lower side play.

Fitment tips: treat the washer as a precision spacing part, confirm the correct orientation when required, and stack sparingly according to assembly specs. If closer tolerances are needed, make gradual thickness changes to preserve balance and alignment of drivetrain parts.