JIC Fitting Thread Sizes: Dash Sizes, Tube OD & SAE J514 Data
JIC (SAE J514) Thread Sizes
| Dash Size | Tube OD | Thread |
|---|---|---|
| -2 | 1/8" | 5/16-24 UNF |
| -3 | 3/16" | 3/8-24 UNF |
| -4 | 1/4" | 7/16-20 UNF |
| -5 | 5/16" | 1/2-20 UNF |
| -6 | 3/8" | 9/16-18 UNF |
| -8 | 1/2" | 3/4-16 UNF |
| -10 | 5/8" | 7/8-14 UNF |
| -12 | 3/4" | 1-1/16-12 UN |
| -16 | 1" | 1-5/16-12 UN |
| -20 | 1-1/4" | 1-5/8-12 UN |
| -24 | 1-1/2" | 1-7/8-12 UN |
| -32 | 2" | 2-1/2-12 UN |
The most common hydraulic fitting in North America. JIC fittings use a 37-degree flare seat and straight threads. The flare provides a metal-to-metal seal without an O-ring, which makes JIC fittings reusable and field-serviceable. You can take them apart and reassemble them without replacing seals.
When to Use JIC (SAE J514)
Mobile equipment and construction machinery.
JIC handles most hydraulic applications from 500 to 5,000 psi.
Choose JIC when you need a connection you can disassemble in the field without carrying spare O-rings.
It is the default choice in North American fluid power.
JIC (SAE J514) Limitations
The flare quality depends on your tube preparation.
A bad flare leaks.
Not as vibration-resistant as ORFS.
For pressures above 6,000 psi, look at ORFS or welded connections.
How to Identify JIC (SAE J514) Fittings
Look for the 37-degree flare on the tube end and straight threads on the body. Often stamped with dash sizes (-4, -6, -8).
JIC (SAE J514) Measurement Tips
When measuring a JIC fitting, the dash size corresponds to the tube OD in sixteenths of an inch. A -8 fitting is for 8/16 inch (1/2 inch) tubing. The thread size does not directly match the tube size. A -8 JIC has a 3/4-16 thread, not a 1/2 inch thread. This catches people who try to measure the thread and match it to the tube size.
What JIC (SAE J514) Is Confused With
JIC and AN (Army-Navy) fittings are dimensionally identical and fully interchangeable. The difference is only in the specification they were manufactured to. AN fittings meet military inspection standards but the threads, angles, and dimensions are the same as SAE J514. If your supplier only stocks AN fittings, they will work in a JIC application and vice versa.
Data sourced from SAE J514, SAE J1926. Thread dimensions are nominal values. Always verify with a thread identification gauge before making connections.