Stamcon, TW;
If the galvanized disk is the shoulder flange of a conduit connector, isn't what we're looking at in the photo wider than the usual flange? Also, I see a notch in the outer edge of the flange at 2 o'clock, and what might be another notch at 10 o'clock.
This puts me in mind of a stamped steel nut with a single thread. If this is the case, I see no evidence of paint removal to ensure a good bond.
