JIC vs SAE: what each term actually means
Ask five hydraulic suppliers what "SAE thread" means and you will get two different answers. The confusion is old, it is widespread, and it causes real wrong orders. Here is the plain version.
The short answer
| Term people use | What it usually refers to | Sealing method |
|---|---|---|
| JIC | 37° flare fitting, SAE J514 (now SAE J514 / ISO 8434-2) | Metal-to-metal on a 37° cone. No O-ring. |
| SAE (in "SAE thread", "SAE port") | SAE straight thread O-ring boss, SAE J1926 / ISO 11926 | O-ring against the boss face. Threads do not seal. |
| ORFS | O-ring face seal, SAE J1453 / ISO 8434-3 | Flat face with a captive O-ring. |
| SAE 45° | SAE J512 flare | 45° cone. Common in automotive and LPG, not interchangeable with JIC. |
Why the two get confused: they share thread sizes
Look at the -04 and -06 rows of both families:
| Dash | JIC 37° flare thread | SAE O-ring boss thread | Same thread? |
|---|---|---|---|
| -04 | 7/16-20 UNF | 7/16-20 UNF | Yes |
| -06 | 9/16-18 UNF | 9/16-18 UNF | Yes |
| -08 | 3/4-16 UNF | 3/4-16 UNF | Yes |
| -10 | 7/8-14 UNF | 7/8-14 UNF | Yes |
| -12 | 1 1/16-12 UN | 1 1/16-12 UN | Yes |
So a JIC -06 male nose will screw into an ORB -06 port. It will not seal, and under pressure it will leak — or the flare will crack if someone keeps tightening to stop the leak. This is the classic failure, and it happens because the parts fit.
How to tell them apart in ten seconds
- Look at the very end. A cone (37° or 45°) is a flare. A flat annulus is ORFS. A plain straight thread with an O-ring and a shoulder is the O-ring boss.
- Look at what it screws into. A boss with a spot-faced flat and a chamfer for an O-ring is J1926. A flared tube end or a flare seat is J514.
- Look at the male part's hex position. On an O-ring boss the hex sits behind the O-ring and a thin washer-like shoulder; on a flare fitting the hex is right at the cone.
- If it currently leaks and the parts are new — check you have not mixed the two families. It is the first thing worth ruling out.
Which one should you specify?
| JIC 37° flare | ORFS | SAE O-ring boss (port) | |
|---|---|---|---|
| Leak performance | Good, sensitive to torque and flare damage | Best of the three under vibration | Good, but the O-ring ages |
| Serviceability | No consumable parts | O-ring must be replaced on reassembly | O-ring must be replaced on reassembly |
| Typical position | Hose and tube connections | Hose and tube connections | Ports into pumps, valves, cylinders |
| Cost | Lowest | Similar to JIC | Port side only |
In practice most machines mix all three: ORB ports on the components, JIC or ORFS on the hose ends. That is why the adapter between them — a port-to-flare or port-to-ORFS adapter — is the highest-volume hydraulic fitting in the world.
Where this bites in export orders
If you have a mixed bag and would rather not write specifications for the whole BOM, send us the list or the drawings — we will normalise it into part numbers you can re-order against.