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The JIC fittings consist of three components to make a Tubing assembly: body, nut, and sleeve.
JIC Fittings Explosion
JIC fittings rely on metal-to-metal contact between the finished surface of the fitting nose and the inside diameter of the flared tubing to make a seal. SSP takes great care in the manufacturing process to produce a flared nose surface that far exceeds published specifications. High quality finishes reduce the likelihood of leakage due to irregularities in the flared tubing.
As the fitting nose and flared tubing are drawn together, they are supported by the fitting sleeve, which distributes the compressing load caused by the nut as it is threaded onto the fitting body during assembly. An installed SAE flared tube fitting system is easy to identify. The sleeve protrudes out the back of the nut. This extension provides the tubing with additional support and lessens the longitudinal load on the fitting nose.
SAE flared tube fittings are available for fractional and metric tubing. Metric assemblies are constructed with standard fractional bodies, and metric nuts and sleeves.