| Nominal Thread | Male Thread O.D. | Female Thread I.D. | |||
| Size | Size | MM | Frac. | MM | Frac. |
| 1/4 | 1/4 - 19 | 13.7 | 17/32 | 12.4 | 1/2 |
| 3/8 | 3/8 - 19 | 17.2 | 11/16 | 16.0 | 5/8 |
| 1/2 | 1/2 - 14 | 21.5 | 27/32 | 19.8 | 25/32 |
| 3/4 | 3/4 - 14 | 26.9 | 1 1/16 | 25.4 | 1 |
| 1 | 1 - 11 | 34.0 | 1 11/32 | 31.8 | 1 1/4 |
| 1 1/4 | 1 1/2 - 11 | 48.5 | 1 29/32 | 46.2 | 1 27/32 |
| 2 | 2 - 11 | 60.4 | 2 3/8 | 58.2 | 2 5/16 |
| The seal is made when contact is made between the male and female flares. | |||||
| The threads retain the connection. | |||||
| To determine the difference carefully measure the seat angle. | |||||