Thread Identification - JIC
JIC Thread Information
Joint Industrial Council
Commonly referred to as just JIC fittings
these metal to metal sealing type fittings have a 37° flare (sealing surface angle) and straight United National Fine straight Threads (UNF).
The original design specification for the fittings comes from the Society of Automotive Engineers (SAE) and these fittings are the most common American fitting type in
MALE: The measurements for the male are taken from the outside of the threads.
FEMALE: For the Female, the measurement
is taken from the inside of the threads.
The below diagram shows both where to take measurements from and the size dimensions.