Stanley Engineered Fastening now offers its self-locking Spiralock thread form, which is claimed highly resistant to shock, vibration, and temperature induced loosening, in a full range of corrosion-resistant, stainless steel, fractional and metric hex flange nuts.
Proven in thousands of applications, Spiralock threaded nuts accept standard male fasteners, eliminate the need for other locking devices, minimise galling since it is free spinning until clamp load is applied, and substantially reduce the potential for fatigue failure compared to standard threads.(…)
via SELF-LOCKING THREAD FORM OFFERED IN STAINLESS STEEL NUTS.