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There are two types of self-locking nuts that I am aware of. One has a nylon insert that locks the nut in place and the other is a nut that has been stamped with a small rectangular punch on the sides to compress the threads in that area. Of the two types, I believe the ones on our trailers are the second type, and I have no faith whatsoever in these, as I have seen them come loose in other applications (my Toro lawn mower for one example). I am considering either adding lock washers or as suggested another nut. Problem is I have lock washers, but no fine threaded 1/2" nuts, so it will probably be the lock washers.
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