What is the threading on the outside of my Celestron GoTo mount’s power jack?

Many of Celestron’s GoTo mounts use the same power jack. These jacks are threaded on the outside. The threading is M8x0.75.

On the CGEM, CGEM DX and the CGE Pro, power adapters (#18780 and the ones included with the scopes) can be screwed down over the jack for a solid connection.