Generally types of threads measured in inches we can divide into a few essential groups. And for pneumatics purposes somehow one day man should know almost all of them.
UNF JIC (used in diving – all 3/8” and 7/16” types are UNF JIC types)
This standard is basically used in low pressure (<10 bar) compressors
And Polish more experience – based source: https://sklep.polberis.pl/pl/i/Jak-zmierzyc-gwint-BSP%2C-BSPT%2C-NPT%2C-UNF%2C-JIC%2C-JIC%2C-metryczny/21