This 3/8 in 1/4 in 37° Flare Male to Male Union is used on aerospace hydraulic systems One end fits 3/8 in Tube OD with 9/16 in-18 thread and the other end fits 1/4 in Tube OD with 7/16 in-20 thread
| Type | Aerospace Aluminum Hydraulic Fittings |
| Style | 37° Flare Male to Male Union |
| Size | 3/8" x 1/4" |
| Material | Aluminum |
| Color | Blue |
| LargeTube Size | 3/8" |
| Small Tube Size | 1/4" |
| Large End Size | 9/16"-18 |
| Small End Size | 7/16'-20 |
| AN Specification | AN919-6D |
| SAE Specification | AS5174D0604 |
| MS Specification | MS24399D0604 |
| Hex Size | 13/16" |
