Hydraulic Fittings Identification Guide
Properly identifying hydraulic fittings is essential for preventing leaks and catastrophic system failure. Never mix different thread types or flare angles.
| Fitting Type | Sealing Method | Thread Type | Details |
|---|---|---|---|
| JIC (SAE J514) | 37° Flare | UNF | Most common hydraulic fitting. Uses a 37-degree flare to create a metal-to-metal seal. |
| ORFS (SAE J1453) | O-Ring Face Seal | UNF | High pressure sealing using an o-ring seated in a groove on the face of the male fitting. |
| NPT / NPTF | 60° Tapered | Tapered | Seals by thread interference. NPTF (Fuel) provides a better seal without tape than standard NPT. |
| BSPP (ISO 228) | 60° Cone | Parallel | Commonly known as G threads. Requires a bonded washer or o-ring to seal. |
| DIN 2353 | 24° Cone | Metric | European standard using a compression sleeve (ferrule) to bite into the tube. |