Copper Crush Washers HA194 compatible with OS4C-120 by Hatroi  [HA194]

Washers designed for OS4C-120 applications

The Hatroi HA194 copper washers are small replacement parts intended for the OS4C-120 referenced in the product title. Produced from copper, these washers give a yielding sealing surface and can act as precise spacers where metal components benefit from a softer interface to preserve contact and limit vibration-induced loosening.

Commonly used as crush or spacer washers on threaded joints and mating surfaces in RC engine systems and related fittings, copper washers conform under torque to enhance sealing and to accommodate minor surface imperfections without cracking or hardening.

Fitment guidance: clean mating faces before fitting, discard washers that display flattening or work-hardening, and apply the appropriate fastener torque to prevent over-compression. For fine tuning, HA194 washers may be used as thin shims to alter clearances; make small adjustments and verify on the bench before running.