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why The internal thread of the product after the electroplating often lock teeth or lock into the phenomenon?

Such as some copper nuts, hex nuts, square nuts, riveting nuts, as well as step nuts, etc., these are internal thread. A product, bad tooth pattern is a fatal flaw. Bad tooth pattern is our daily inspection work often encountered problems, through our exploration, and now the problem has been our solution.


The main reason for bad tooth pattern:

1) the process of filament wear 

 2)the pre-treatment is not clean

3)the plating layer is too thick

4)The teeth of the test teeth (teeth) used too long, there are wear