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
NominalDashThread typePitch / TPIMajor diameterSeal
9/16-18-04parallel18 TPI0.5625 in / 14.288 mmface_seal
11/16-16-06parallel16 TPI0.6875 in / 17.463 mmface_seal
13/16-16-08parallel16 TPI0.8125 in / 20.638 mmface_seal