In a self-locking nut including a threaded upper collar equipped with longitudinal slots in U-shape defining in collar a plurality of circular arc segments compressed by a helical external spring, the spring is subjected to a hot-galvanizing treatment and is provided in harmonic spring steel if it operates below 250 DEG C., while it is provided in stainless spring steel if it operates above 250 DEG C., and the nut, provided in stainless steel if it operates at high temperatures, is subjected to an electrolytic coppering treatment.
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