| Tube Size X NPT Thread Inch | 10-32 UNF | 1/8" NPT | 1/4" NPT | 3/8" NPT | 1/2" NPT |
|---|---|---|---|---|---|
| 5/32" OD | PD5/32-U10U | PD5/32-N1U | PD5/32-N2U | ||
| 3/16" OD | PD3/16-U10U | PD3/16-N1U | PD3/16-N2U | | |
| 1/4" OD | PD1/4-U10U | PD1/4-N1U | PD1/4-N2U | PD1/4-N3U | |
| 3/8" OD | PD3/8-N2U | PD3/8-N3U | PD3/8-N4U | ||
| 1/2" OD | PD1/2-N2U | PD1/2-N3U | PD1/2-N4U | ||
| Tube Size X BSPT Thread Metric | M5 X .8 Thread | R1/8 | R1/4 | R3/8 | R1/2 |
| 4MM | PD4-M5 | PD4-01 | PD4-02 | ||
| 6MM | PD6-M5 | PD6-01 | PD6-02 | PD6-03 | |
| 8MM | PD8-01 | PD8-02 | PD8-03 | ||
| 10MM | PD10-01 | PD10-02 | PD10-03 | PD10-04 | |
| 12MM | PD12-02 | PD12-03 | PD12-04 | ||
| 16MM | PD16-03 | PD16-04 |