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A comment on Self-tightening nut that provides tight fastening with a unique screw thread. Parent comment
It's not that unusual an idea. Pipe threads and fittings have both sides of the thread in contact, to prevent leaks. Look up "National Pipe Thread". There are lots of self-locking thread designs, such as Wide-Lock (http://www.threadcheck.com/self-locking-thread/), Spiral-Lock (http://www.youtube.com/watch?v=0hCgeimks94).
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It's not that unusual an idea. Pipe threads and fittings have both sides of the thread in contact, to prevent leaks. Look up "National Pipe Thread". There are lots of self-locking thread designs, such as Wide-Lock (http://www.threadcheck.com/self-locking-thread/), Spiral-Lock (http://www.youtube.com/watch?v=0hCgeimks94).