..the Home Depot here has a selection of metric hex head socket cap machine screws in 4,5,6 in various lengths that is quite impressive.

There are quite a few drawers in the section where they are at, so you might want to ask for help on your first visit.


They also sell a set of metric taps and dies for thread restoration that covers 4, 5, 6, and 7 mm metric. Different location, over in tools.