These fasteners made by Stage 8 in the USA have a patented system, and are 100% guaranteed to avoid coming loose. Their design doesn't just block friction between the threads (how standard bolts and nuts usually work), but ensures a complete lock of the mechanism that can withstand almost anything. Once the nut is in place, a retainer is placed on it (the part having a "water drop" shape), allowing it to be wedged against any surrounding part, and mechanically locking it tight. To finish, a snap ring (also called "clip") is placed in the groove of the nut, to guarantee complete locking. Guaranteed. In the past 30 years, millions of these fasteners have been sold, and Stage 8 have never encountered any failure. They are so reliable that their patented fasteners are used on spacecrafts and nuclear submarines.
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