| Metric Tube | Inch tube | |||||||||
| 4 | 6 | 8 | 10 | 12 | 14 | 16 | 1/8 | 1/4 | 3/8 | 1/2 |
| 4mm | 6mm | 8mm | 10mm | 12mm | 14mm | 16mm | Φ1/8 | Φ1/4 | Φ3/8 | Φ1/2 |
| Metric Size | Tube(Inch)-Thread(R) | |||||
| code | M5 | M6 | 1 | 2 | 3 | 4 |
| ΦD | M5×0.8 | M6×1 | R1/8" | R1/4" | R1/4" | R1/2" |
| G(PF)Thread | ||||||
| Code | G01 | G02 | G03 | G04 | ||
| Thread | G1/8" | G1/4" | G3/8" | G1/2" | ||
| NPT Thread | ||||||
| Code | N01 | N02 | N03 | N04 | N06 | |
| Thread | NPT1/8 | NPT1/4 | NPT3/8 | NPT1/2 | NPT3/4 | |