Spaenaur Catalog
https://spaenaur.com/download/
MISUMI Catalog
https://us.misumi-ec.com/vona2/mech_screw/
McMaster-Carr Catalog
https://www.mcmaster.com/screws/
Unbrako Catalog
http://www.unbrako.com/images/downloads/unbrako_catalog.pdf
Stanley Engineering Catalog
https://catalog.stanleyengineeredfastening.com/