Where the hell do I farm screws?

Like the title says, I have been constantly out of them, and have 0 clue where I get them from. Whenever I search it up I don’t actually find an answer, and I don’t mean a location like Charleston where I got 4 and have to hop servers, I want to know a spot where I can get at least 8. Radium rifle mods are what I’m tryna grind for, if anyone knows where to farm screws or if they have any (I’m ps4) let me know.