Hatroi HA194 Copper Washers for OS4C-120 RC spare part  [HA194]

Copper washers for OS4C-120

The Hatroi HA194 copper washers are small RC-scale spare parts specified for use with the OS4C-120 listing in the product title. Manufactured from copper, these washers serve as durable sealing and spacing elements where metal-to-metal joints require a soft, conforming interface to help maintain reliable contact and reduce loosening from vibration.

In practice these washers are used as crush or spacer washers on threaded fittings and mating surfaces in RC engine assemblies and related ancillaries. Their copper composition provides a malleable contact surface that conforms under torque to improve sealing and to compensate for minor surface irregularities without hardening or cracking.

Installation notes: ensure mating faces are clean and free of debris before fitting, replace washers that show deformation or work-hardening, and apply appropriate torque for the specific fastener to avoid over-compression. For tuning tasks, they can be used as thin shims to alter clearance in tight assemblies, but changes should be made incrementally and tested on the bench before full operation.