Hatroi HA171 Copper Washer Pack — RC Spare YS4C-53 OS4C-91  [HA171]

Service-Grade Copper Washers for Models

The Hatroi HA171 set supplies thin copper washers intended for routine RC servicing and minor repairs. These copper shims help with spacing, light sealing, and reduce direct metal contact where assemblies sit close together. The fitment codes YS4C-53 and OS4C-91 are preserved for reference.

Practical applications include shimming to fine-tune clearances between moving parts, acting as soft seals where a pliable metal is useful, and protecting mating fasteners from wear. Their dimensions suit compact model areas where small thickness adjustments affect operation and alignment.

Fitting tips: ensure contact surfaces are clean before placing a washer, use only the number needed to reach the correct clearance, and avoid tightening beyond what the copper can take without deforming. Recheck parts after assembly to confirm the intended effect.

Handling and storage: copper is somewhat malleable so washers will conform slightly under load, which is useful for sealing and conductive duties. Store them flat to retain consistent thickness and use appropriate small tools when working with these components.

Fits With

• YS4C-53
• OS4C-91