| Part No. | 1 Tube Thread | C Hex | T Thickness | |
| FS-306-04 FS-306-06 | 9/16 - 18 11/16 - 16 | 13/16 1” | 0.27 0.31 | |
| FS-306-08 FS-306-10 | 13/16 - 16 1 - 14 | 1 1/8 1 5/16 | 0.35 0.42 | |
| FS-306-12 FS-306-16 | 1 3/16 - 12 1 7/16 - 12 | 1 1/2 1 3/4 | 0.41 0.41 | |
| FS-306-20 FS-306-24 | 1 11/16 - 12 2 - 12 | 2” 2 3/8 | 0.41 0.41 | |