Hatroi HA171 is a set of copper washers intended for RC-scale maintenance and small repair tasks. These washers are presented as thin copper shims that help with spacing, sealing, and reducing metal-on-metal contact in tight assemblies. The product name contains the reference codes YS4C-53 and OS4C-91 which are preserved as compatibility identifiers from the original listing.
In practical RC use these washers serve multiple roles: as shims for adjusting clearance between mating parts, as sealing washers where a soft conductive metal is preferred, and as protective interfaces to limit direct wear on threaded fasteners. They are sized to fit into confined assemblies common in model components where small thickness changes affect alignment or preload.
Installation notes: ensure mating surfaces are clean and free of debris before placing a washer, stack only as needed to reach the desired clearance, and avoid excessive tightening that can deform thin copper washers. Use standard RC fastener practice and check fitment during reassembly to confirm the washers deliver the intended spacing or sealing effect.
Material and handling: copper offers moderate pliability which allows the washer to conform slightly under load, and it is commonly chosen for small sealing and conductivity needs in model-scale parts. Store washers flat to preserve thickness consistency and handle with basic hand tools appropriate for RC hardware.
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