The Hatroi HA171 pack contains thin copper washers intended for model servicing and minor repairs. These washers act as spacers, soft seals, and buffers to reduce direct metal-on-metal contact in tight assemblies. Compatibility references YS4C-53 and OS4C-91 remain included as fit identifiers.
Common applications include shimming to achieve correct clearances, using a soft metal for sealing where required, and protecting screw threads from direct wear. Their slim profile is suitable for locations where tiny thickness variations change alignment or preload characteristics.
Fitting recommendations: clean the mating areas before inserting a washer, use the minimum number required to obtain the correct spacing, and avoid over-tightening which can distort copper washers. Verify the assembled parts operate as expected after fitting the washers.
About the material: copper is slightly malleable and will conform under pressure, making it a regular choice where small sealing or conductive properties are needed. Store the washers flat to maintain uniform thickness and use appropriate small tools during handling.
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