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.
The weld fitting can be used in place of threaded fittings, so the risk of leakage is much smaller. Weld fitting needs not to be beveled for weld preparation. The weld metal can not penetrate into the bore of the pipe. Construction costs are lower than with butt-welded joints due to the lack of exacting fit-up requirements and elimination of special machining for butt weld end preparation.
SAE high pressure flanges are used as a reliable alternative to regular pipe and tube connectors. Their biggest advantage is the considerably higher pressure resistance for many sizes and the continuous pressure level of the high pressure series which can operate with maximum working pressures of up to 400 bar.http://www.hydraulicfitting-china.com/jic-fitting/