JIC fitting is common in most fluid power systems. Both male and female components have 37 degree seats. The seal is formed by establishing contact between the male flared and the female coned seat. This is considered a mechanical connection. There are three components that make a tubing assembly; fitting, flare nut and sleeve. They are readily available, offering a large variety of sizes, shapes, combinations and materials. Sizes are consistent with SAE fittings which makes them easily interchangeable and identifiable. The absence of an O-ring makes them desirable in high temperature applications.

http://www.hydraulicfitting-china.com/jic-fitting/