To determine the size of a JIC (Joint Industry Council) fitting, measure the outside diameter (OD) of the male thread or the inside diameter (ID) of the female thread using a caliper. Then, compare the measurement to a JIC fitting size chart to identify the corresponding fitting size. See full answer »

The JIC (Joint Industry Council) fitting is equivalent to the AN (Army-Navy) fitting in terms of thread size and pitch, but they are not identical. Both types use a 37-degree flare to create a metal-to-metal seal, making them compatible for many applications, though AN fittings are typically made to stricter military specifications. See full answer »