Answer
Apr 27, 2026 - 07:33 AM
A 3/8" JIC fitting refers to the size of the tube it is designed to fit, not the actual thread size. The thread size for a 3/8" JIC (SAE 37° flare) fitting is 9/16"-18 UNF. This means it has a thread diameter of 9/16 inch and 18 threads per inch.
