This 1/2" 3/8 in 37° Flare Male to Male Union is used on aerospace hydraulic systems. One end fits 1/2" Tube OD with 3/4 in-16 thread and the other end fits 3/8 in Tube OD with 9/16 in-18 thread.
| Type | Aerospace Aluminum Hydraulic Fittings |
| Style | 37° Flare Male to Male Union |
| Size | 1/2" x 3/8" |
| Material | Aluminum |
| Color | Blue |
| LargeTube Size | 1/2" |
| Small Tube Size | 3/8" |
| Large End Size | 3/4"-16 |
| Small End Size | 9/16"-18 |
| AN Specification | AN919-12D |
| SAE Specification | AS5174D0806 |
| MS Specification | MS24399D0806 |
| Hex Size | 1" |
