Hydraulic fittings
ORFS Thread Chart
Reference geometry rows for ORFS thread identification. Use with physical pitch and sealing checks.
Last updated 2026-05-12Confidence: reference-derived3 rows
| Nominal | Dash | Thread type | Pitch / TPI | Major diameter | Seal |
|---|---|---|---|---|---|
| 9/16-18 | -04 | parallel | 18 TPI | 0.5625 in / 14.288 mm | face_seal |
| 11/16-16 | -06 | parallel | 16 TPI | 0.6875 in / 17.463 mm | face_seal |
| 13/16-16 | -08 | parallel | 16 TPI | 0.8125 in / 20.638 mm | face_seal |