Tube / Thread Cross-Reference
| Dash Size | Tube OD | NPT Pipe Thread | BSPT-BSPP Pipe Thread | SAE O-Ring & JIC 37° Flare | Flat Face Thread | 45° SAE Flare | Inverted Flare | Titan Compression |
|---|---|---|---|---|---|---|---|---|
| -2 | 1/8 | 1/8-27 | 1/8-28 | 5/16-24 | - | 5/16-24 | 5/16-28 | 5/16-20 |
| -3 | 3/16 | - | - | 3/8-24 | - | 3/8-24 | 3/8-24 | 3/8-20 |
| -4 | 1/4 | 1/4-18 | 1/4-19 | 7/16-20 | 9/16-18 | 7/16-20 | 7/16-24 | 7/16-20 |
| -5 | 5/16 | - | - | 1/2-20 | - | 1/2-20 | 1/2-24 | 1/2-20 |
| -6 | 3/8 | 3/8-18 | 3/8-19 | 9/16-18 | 11/16-16 | 5/8-18 | 9/16-24 | 9/16-20 |
| -7 | 7/16 | - | - | - | - | 11/16-16 | 5/8-24 | - |
| -8 | 1/2 | 1/2-14 | 1/2-14 | 3/4-16 | 13/16-16 | 3/4-16 | 1-1/16-20 | 3/4-20 |
| -10 | 5/8 | - | - | 7/8-14 | 1-14 | 7/8-14 | 1-3/16-18 | 7/8-20 |
| -12 | 3/4 | 3/4-14 | 3/4-14 | 1-1/16-12 | 1-3/16-12 | 1-1/16-14 | 1-18 | 1-20 |
| -14 | 7/8 | - | - | 1-3/16-12 | - | - | - | - |
| -16 | 1 | 1-11.5 | 1-11 | 1-5/16-12 | 1-7/16-12 | - | - | 1-5/16-20 |
| -20 | 1-1/4 | 1-1/4 - 11.5 | 1-1/4 - 11 | 1-5/8-12 | 1-11/16-12 | - | - | 1-5/8-20 |
| -24 | 1-1/2 | 1-1/2 - 11.5 | 1-1/2 - 11 | 1-7/8-12 | 2-12 | - | - | 1-7/8-20 |
| -32 | 2 | 2-11.5 | 2-11 | 2-1/2-12 | - | - | - | 2-1/2-20 |