HARDLOCK nut consists of 2 nuts. Lower nut has an un-coaxial projection. When the other upper nut meets the lower one, projection ring will fit inside the upper's hollow except the bold side.
the tapered bold side of the projection ring will bite the hollow of the upper nut and push them each other. This side force strangle the nut and harden the lock.
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原典
Made by uploader (ref:若林克彦著、『絶対にゆるまないネジ』、(株)中経出版、2011年3月3日第1刷発行、ISBN9784806139744)
{{Information |Description ={{en|1=HARDLOCK nut<br /> HARDLOCK nut is consist by 2 nuts. Lowwer nut has an un-coaxial projection. When the other upper nut meets the lowwer one, projection ring will fit inside the upper's hollow except the bold s