Hatroi HA171 is a set of copper washers designed for RC-scale maintenance and small repairs. These thin copper shims provide spacing, soft sealing, and reduce metal-on-metal contact inside tight mechanical assemblies. The original listing compatibility codes YS4C-53 and OS4C-91 are retained as fitment references.
In typical RC use these washers act as shims to adjust clearance between mating parts, as soft sealing washers where a malleable metal is preferred, and as sacrificial interfaces to limit direct wear on threaded fasteners. They are sized for confined model components where tiny thickness changes influence alignment or preload.
Installation advice: clean mating surfaces before fitting a washer, stack washers only as required to reach the needed clearance, and avoid over-tightening which can deform thin copper shims. Follow common RC fastener practice and check fit during reassembly to confirm the desired spacing or seal is achieved.
Material notes: copper offers moderate pliability so the washer can conform slightly under load, making it a common choice for small sealing and conductivity needs in model parts. Keep washers stored flat to protect thickness consistency and handle them with appropriate hand tools for RC hardware.
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