Looking for a Flat head nut that holds Ac intake grate

Hi everyone, I'm looking for the correct name for the screw in my imgur post. it's a flat head nut (basically looks like a screw with a female thread) that holds the AC grate to the frame, I would really appreciate anyones help!

https://imgur.com/a/kz90KP5

submitted by /u/cwdesignsvs
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from DIY https://ift.tt/2zuLUlJ