In hydraulic fittings manufacturing industry, we can see many threads on the fittings. UNF and JIC are the most common threads or sealing in the market. Today we would like to make a quick introduction about the difference between UNF and JIC.
What’s JIC?
JIC fitting meets SAE J514/ISO 8434-2 standard, and is metal to metal sealing type fittings which have a 37° flare (sealing surface angle)and straight United National Fine straight Threads (UNF).
JIC(Joint Industry Council) fittings are made meet the Society of Automotive Engineers (SAE) standard .This kind of fittings are widely used in fuel delivery and fluid power applications, especially where high pressure (up to 10,000 psi) is involved.
What’s UNF?
“UNF thread” refers to a Unified National Fine thread, which is part of the Unified Thread Standard (UTS) used in the United States and Canada. The UTS defines a standardized system of threads (screw threads) for fasteners, such as bolts and nuts. The “UNF” designation stands for “Unified National Fine,” where “fine” indicates the thread has a smaller pitch compared to the Unified National Coarse (UNC) thread, which is the other main thread type in the UTS.
What’s The Main Difference Between UNF and JIC?
The main difference is that JIC has a conical seating face (37 degree or 74 degree total angle) and UNF Straight has a flat seat – sealing being effected by use of a O-ring or washer. Male JIC fittings have a convex cone, female fittings a concave cone.
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