Have one drawer in my Kennedy chest dedicated to various machine screw sizes, keenserts, nuts, EZ Outs and odds and ends.
Is handy in a shop.
Have a couple jars of other of random screws around.
I remember going to a FIRST event once and the screws had been sorted into a multi cavity container, and one of the kids dropped it in the pit 😛
The thing was never the same again that weekend 🙂