a brilliant little reference book.

[Phil Pascoe]

If you're orderering from Zoro and trying to make the free P&P it's worth getting. It's worth getting anyway, and undoubtedly available in other places. Thread forms, tapping drill sizes, all manner of different fixings etc. Brilliant for the money.
https://www.zoro.co.uk/shop/tools-a...-books/the-ref-fastener-handbook/p/ZT1126132X