What are these nut things called?
I think they are fitted tightly into sheet metal by banging on the open end as a decent alternative to self-tapping holes, that just get bigger and bigger if used too often.
These are 6 BA. I can see the one with the serrated shaft would grip the sheet it's bashed in to, but no idea what purpose the serrations on the other has around its shoulder.
Anyway, what are they called?
Thank you.
Ian
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