37° Flare (JIC)
The Society of Automotive Engineers (SAE) specifies a 37° angle flare or seat be used with high pressure hydraulic tubing. These are commonly called JIC couplings.
The JIC 37° flare male will mate with a JIC female only. The JIC male has straight threads and a 37° flare seat. The JIC female has straight threads and a 37° flare seat. The seal is made on the 37° flare seat.
All sizes have the same threads as the SAE 45° flare except -6 and -12. Carefully measure the seat angle to differentiate.
*Note: Some C5, C5E and Lock-On couplings may have *Note: dual machined seats (both 37° and 45° seats).
*37° Flare (JIC)
| Dash Size |
Nominal Size (In.) |
No. Threads Per Inch |
Male Thread O.D. (In.) |
Female Thread I.D. (In.) |
| 2 |
1/8 |
5/16 -24 |
5/16 |
17/64 |
| -3 |
3/16 |
3/8 -24 |
3/8 |
21/64 |
| -4 |
1/4 |
9/16 -20 |
7/16 |
25/64 |
| -5 |
5/16 |
1/2 -20 |
1/2 |
29/64 |
| -6 |
3/8 |
9/16 -18 |
9/16 |
1/2 |
| -8 |
1/2 |
3/4 -16 |
3/4 |
11/16 |
| -10 |
5/8 |
7/8 -14 |
7/8 |
13/16 |
| -12 |
3/4 |
1 1/16 -12 |
1 1/16 |
31/32 |
| -14 |
7/8 |
1 3/16 -12 |
1 3/16 |
1 7/64 |
| -16 |
1 |
1 5/16 -12 |
1 5/16 |
1 15/64 |
| -20 |
1 1/4 |
1 5/8 -12 |
1 5/8 |
1 35/64 |
| -24 |
1 1/2 |
1 7/8 -12 |
1 7/8 |
1 51/64 |
| -32 |
2 |
2 1/8 -12 |
2 1/2 |
2 27/64 |
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