VHP SAE J514 370 (JIC)
The Society of Automotive Engineers (SAE) specifies that a 37° flare or seat should be used with high-pressure hydraulic tubing. These are commonly known as JIC fittings.
The JIC 37° flare male will mate only with a JIC female.
The JIC male has straight threads and a 37° flare seat. The JIC female has straight threads and a 37° cone seat.
The seal is achieved on the 37° flare seat by establishing a line contact between the male flare and the female cone seat. The threads maintain the connection mechanically.