'Engineers ' only - I need your help

That’s what Nazi Germany said.

It didn’t go too well. Just saying.
 
Put a handful of screws on a tray.

Use a washing machine with a variable spin speed part loaded.

Position the tray on the washing machine top and see what happens to the screws under vibration.

Possibly a small barrier placed across the tray will allow smaller screws to pass over it as they will be livened more.

This may take several passes and some experimentation on spin speeds and number of sheets or towels to produce an effect.

Your wife will be pleased that you are taking an interest in the laundry.
 
go on fiverr.com

locate a Chinese/Indian/other cheap person

ship screws to them complete with boxes, have them sort and ship back to you

post results when done :)
 
I'd get a large sheet of plywood and screw each in until the head is flush. When you turn the plywood over, you'll be able to easily see which are the long ones and short ones.

Simply unscrew them in order and place in the relevant green tub.
 
LOL - problem is that (unlike the coin sorter) he's basically putting them in one at a time... he might as well therefore be sorting them himself.
 
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