Center punched fasteners

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Deets55 said:
Just curious, but is it possible that some of these “punched” nuts are really just manufactured, all metal locking nuts? I have seen them out of the box with dimples on the side and also on the top that act as a self locking feature. I’m not sure if this pre-dates nylon locking nuts, but I have run across a lot of them.
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Distorted-Thread Locknuts. There are many types readily available today. Here are a few: https://www.mcmaster.com/all-metal-locknuts
 
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