Alright, I have a challenge for all y'all. I'm trying to identify a very specific type of washer used in a server rack so I can buy a bunch of them.
So on a standard post, you have a cage nut and a matching screw. Fine for most purposes. But I ordered some sliding rails, which don't work for other reasons, that do something different.
Instead, what you have is a flat head screw similar to
this. It goes into a standard nut on the back side. What makes it work is a weird little piece that sits behind the screw in the front. It's a bit bigger than the post hole, and it's basically a washer that allows the screw to sink down into it. This allows you to secure a device to the hole while still having a flush surface on the front. You can't actually screw into it afterward, but if it's 2U or more, you can use the other U(s) with standard cage nuts and screws. It's actually a pretty fucking clever piece of engineering for some no name chinkshit I ordered off Amazon.
The problem is I have never, ever, in my entire life seen a washer that looks remotely like this. I'd describe it as a recessed square washer, but I've tried about a thousand variations of that and found nothing anywhere. It may be truly custom for the company that sells these rails. I'll take a picture if absolutely necessary, but I'm afraid you niggers would somehow dox me by the reflection of my ceiling fan in the metal or some shit.