Swivel Union (Swivel Nut to Swivel Nut)
| Tube OD | SAE / MSStraight Thread | L | A/F-1 | A/F-2 | Dawsons-TechPart No. | ||
| B | |||||||
| Inch | Metric | UN / UNF | mm | Inch | Inch | Inch | Metric |
| 1/4 | 6 | 7/16 x 20 | 37.6 | 9/16 | 9/16 | 37SU-4 | 37SU-6M |
| 3/8 | 10 | 9/16 x 18 | 44.5 | 11/16 | 11/16 | 37SU-6 | 37SU-10M |
| 1/2 | 12 | 3/4 x 16 | 51.3 | 7/8 | 7/8 | 37SU-8 | 37SU-12M |
| 5/8 | 16 | 7/8 x 14 | 56.9 | 1 | 1 | 37SU-10 | 37SU-16M |
| 3/4 | 18 | 1-1/16 x 12 | 58.7 | 1-1/4 | 1-1/4 | 37SU-12 | 37SU-18M |
| 1 | 25 | 1-5/`6 x 12 | 69.9 | 1-1/2 | 1-1/2 | 37SU-16 | 37SU-25M |