I am trying to find a circular connector that would mate to this:
The OD of the threads measures 15.56mm, so it is probably M16, (unless SAE threads are common for this sort of thing; 16mm & 5/8 are awfully close).
The inside of the threaded shell is ~12.9mm
The diameter of the pins is 1.1mm
The seven outer pins are evenly spaced on a 9mm circle
If there is any other information that would help in identifying this, please let me know.