A neat link to a 32 page "Lay Over" style sizing chart that covers all the charts they have or you can dig around and find the charts separated on the site. Between this and some thread checkers, I at least have a fight chance to control the coffee tins of miscellaneous fasteners I magically seem to create.

https://www.boltdepot.com/fastener-information/Printable-Tools/Printable-Fastener-Tools.pdf