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Can we find out about the parts that the arduino uses?

I want to make a shield, and i bought the same power jacks.

And i thought that there would be two pins, one for power, one for GND. However, it has three pins.

The supplier did not have a datasheet, and right now i do not have a continuity beeper either, so could i see its datasheet somewhere, or does anyone know why it has three pins?

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    The third pin is connected to the sleeve pin, if there is no jack plugged in. It disconnects when a jack is plugged in. You can use it to detect if a jack is plugged in. You can even use it have you project run on batteries, and automatically switch if a power-jack is plugged in. Though in almost all cases you leave it disconnected, or connect it to the sleeve pin. PS this third pin also makes it so the plug is more solidly connected to the PCB.
    – Gerben
    Dec 3 '20 at 15:42
  • @Gerben Thank you! But which is the center pin, and which is the third pin? Plus, i suppose that the polarity of these two pins is GND right? I mean the extra pin (whatever it is), is not connected to the center of the power connector (the power), but to the side (the GND). Am i correct? Dec 4 '20 at 21:09
  • @timemage. Hello. What do you mean? Dec 4 '20 at 21:09
  • Just me venting. I had written an answer. It's gone now. I find it extremely frustrating that no one pays attention to the thing that is literally written right on the box that I am typing into now, which says "Use comments to ask for more information or suggest improvements. Avoid answering questions in comments."
    – timemage
    Dec 4 '20 at 21:22
  • @timemage Why did you delete your answer? Dec 4 '20 at 23:29
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This is an image from a typical power jack:

From here https://www.we-online.de/katalog/datasheet/6941xx301002.pdf

The specific ones you bought may differ. The vendor should be able to supply you with a manufacturer and P/N or an actual data sheet.

Image copied from: https://www.we-online.de/katalog/datasheet/6941xx301002.pdf

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