Hydraulic fittings
JIC Thread Chart
Reference geometry rows for JIC 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 |
|---|---|---|---|---|---|
| 7/16-20 | -04 | parallel | 20 TPI | 0.4375 in / 11.113 mm | flare |
| 9/16-18 | -06 | parallel | 18 TPI | 0.5625 in / 14.288 mm | flare |
| 3/4-16 | -08 | parallel | 16 TPI | 0.750 in / 19.05 mm | flare |