JIC hydraulic fittings is a fittings meet SAE J514 standard with 37 degree flare. it has high-pressure rating and excellent seal. they are widely used in in industries such as agriculture, construction, and manufacturing.
If you plan to use them, you should measure them accurately.Here is a simple guide to help you measure them correctly.
1. Ascertaining the JIC thread size
JIC fittings size range from 1/8 inch to 2 inches. To ascertaining the right size:
For Male Threads: use a caliper or thread gauge to measure the outside diameter (OD) of the threaded part . For an accurate measurement, always ensure that you measure at the widest point.
For Female Threads: Measure the threaded section inside diameter (ID). Again, for accurate thread measurement, use a caliper or thread gauge and measure at the broadest point.
JIC fitting size chart
| Працяжнік Памер |
Nominal Size | No. Threads Per Inch |
Female Threads Thread I.D. (inc.) |
Male Threads Thread O.D. (Inc.) |
| -2 | 1/8" | 24 | 17/64" | 5/16" |
| -3 | 3/16" | 24 | 21/64" | 3/8" |
| -4 | 1/4" | 20 | 25/64" | 7/16" |
| -5 | 5/16" | 20 | 29/64" | 1/2" |
| -6 | 3/8" | 18 | 1/2" | 9/16" |
| -8 | 1/2" | 16 | 11/16" | 3/4" |
| -10 | 5/8" | 14 | 13/16" | 7/8" |
| -12 | 3/4" | 12 | 31/32" | 1-1/16" |
| -14 | 7/8" | 12 | 17/64" | 1-3/16" |
| -16 | 1" | 12 | 1-15/64" | 1-5/16" |
| -20 | 11/4" | 12 | 1-35/64" | 1-5/8" |
| -24 | 11/2" | 12 | 1-51/64" | 1-7/8" |
| -32 | 2" | 12 | 2-27/64" | 2-1/2" |
2. Count the Threads
Next, determine the thread pitch, defined as the number of threads per inch (TPI). You may also use a thread gauge or pitch gauge. Slide the gauge over the threads. The blade that fits perfectly between the threads will indicate the TPI.
3. Identifying Between Male and Female Fittings
Female JIC Fitting comes with internal threads, a 37-degree flare seat, and a sleeve. The sleeve compresses onto the male fitting, ensuring a snug fit.
Male JIC Fitting has external threads and a 37-degree flare seat. It forms a metal-to-metal bond when paired with its female counterpart.
4. Verifying the Flare Angle
The fourth step is verifying the flare angle. JIC fittings flare angle is 37 degrees. You can use a flare angle gauge to confirm this. When placed gauge over the fitting, you should ensure gauge match the 37-degree flare angle.
У заключэнне
Measuring JIC fittings doesn’t have to be complicated. With the right tools and this guide (measure the thread size, count the threads, identify the fitting type, and verify the flare angle). This ensures a proper fit and reliable seal for confident installation.