| Code | imperial tube external diameter | |
| inches | mm | |
| SN-1 | 1/16" | 1.59 |
| SN-2 | 1/8" | 3.17 |
| SN-3 | 3/16" | 4.76 |
| SN-4 | 1/4" | 6.35 |
| SN-5 | 5/16" | 7.93 |
| SN-6 | 3/8" | 9.52 |
| SN-8 | 1/2" | 12.70 |
| SN-10 | 5/8" | 15.87 |
| SN-12 | 3/4" | 19.05 |
| SN-14 | 7/8" | 10.22pm |
| SN-16 | 1" | 25.40 |
| SN-20 | 1-1/4" | 31.75 |
| SN-24 | 1-1/2" | 38.10 |
| SN-32 | 2" | 50.80 |
| Code | diameter external metric tube |
mm | |
| SN-2M | 2 |
| SN-3M | 3 |
| SN-4M | 4 |
| SN-6M | 6 |
| SN-8M | 8 |
| SN-10M | 10 |
| SN-12M | 12 |
| SN-15M | 15 |
| SN-16M | 16 |
| SN-18M | 18 |
| SN-20M | 20 |
| SN-22M | 22 |
| SN-25M | 25 |
| SN-28M | 28 |
| SN-32M | 32 |
| SN-38M | 38 |