There are many applications where threaded fasteners can loosen because of shock & vibration caused by trains.
Hardlock Nuts are a product that resists loosening by vibration. It enhances safety, improves reliability and reduces inspection and maintenance costs.
Japanese Railways have specified Hardlock Nuts for more than 40 years. In the UK, Network Rail have specified Hardlock Nuts for over 10 years, with new applications being added to all the time.
The Hardlock Nut is the best solution for nut & bolt assemblies on railway track, turnouts, crossings and overhead power systems.