Pics here https://cabinznet.blogspot.com/2018/06/idea-for-sorting-mixed-bucket-of-screws.html
The Cabinz Project (Uk) donates and sells at low cost, screws , bolts & building materials
Cabinz are talking and delivering to other community groups for use by their members with health & learning issues sorting the fittings.
These mixed buckets are what is left after the larger fittings have been separated . Below is what sorting Cabinz do to get to that stage
Pic1
Cabinz get them in a large crate.
The larger fixings are removed by hand in 1/8 to 1/4 kg handfuls. Then cupped to the chest while being seperated with the other hand .
They are then dropped into seperate plastic tubs or reused paint 10L empty paint buckets (donated from Recipro local paint reuse project) A thick plastic bag is taped into these buckets to stop dry paint chips getting mixed in with screws
An alternative method is to put a handful on a tabel & seperate from there into piles.
Fittings are donated to theses groups for free to be used within the group or distributed further