https://en.wikipedia.org/wiki/Screw
https://en.wikipedia.org/wiki/List_of_screw_drives
https://ecal.ch/en/4081/elac-gallery/exhibitions/-u-joints-exhibition
https://www.schrauben-preisinger.de/
https://www.hoerr-edelstahl.de/Befestigungsmaterial/Schrauben/
DIN
Whitworth