When I plug my 12v dc power jack into the panel 5.5mm x 2.1mm socket, the metal panel becomes grounded. I have a metal case (panel) that I have drilled a thru hole in for my socket. The socket has a metal body and threads. The negative (outside) is not connected to the thread body until I push a jack in, then it is connected, thus making my panel part of the ground.

I can't seem to find a metal threaded socket that doesn't do this. A plastic body one works, except that when I tighten the nut, the plastic threads strip.

Can someone point me to one or two that will work ? Hopefully inexpensive ones. I can't find them on e-Bay.

 

These things are so cheap – I suggest you tighten by hand, then apply epoxy glue as the main fixing medium.

https://www.ebay.co.uk/itm/10x-DC-P...985559&hash=item1ee2c982ae:g:-lwAAOSwNyFWcpG9