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Discussion Starter #1
Hate when this happens. Good reason not to buy too much stuff ahead of time.

I can't remember what I bought these for. How many places might these be used? I took a pic next to a seat nut to show they are a bit smaller.
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Look kinda like some I have seen on outer shock tower covers, a couple places under the dash, behind some kick panels, and inside doors, where no washer is used.
 

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What you have there is a serrated flange nut. The flange acts like a washer, distributing the load over a larger area than the nut alone. The serrations act as a locking feature, preventing the nut from loosening under vibration. A possible use would be on the transmission linkage rods where the end of the rod has a slotted hole to allow for adjustment. The serrations will distort the metal that they are tightened against.
 

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Discussion Starter #6
I have a manuals trans and can't find a place for it so i don't so. The body nut makes a lot of sense but I would not have bought them for that, I would have bought a bulk of them for that use. there were 2 in the bag. When i found them i thought "seat nut" because i was missing a couple but while grouping them them I saw they are too small for that.
 

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I just took one of those serrated nuts off of my C4 shifter linkage for the trans. I'm sure there's a few other uses for them.
 
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