The unthreaded housing/shell flange means it's not meant for direct panel-mount with jackscrews — you'll need a separate bracket or a mating plug with a threaded shell if you want a rigid panel fix.
The gold plating thickness of 8.00 µ" is a flash coat; it'll hold up to a few hundred cycles in a clean environment but will wear faster in dusty or corrosive conditions. The steel shell with tin plating gives reasonable EMI shielding for a non-filtered D-sub.
