fittings › boss elbows
AN939D4
Aeronautical Standard Boss Elbow
Description
Tee, Tube
Specifications
| Connection Style | Gasket seal (boss) all ends |
|---|---|
| Connection Type | Threaded internal boss all ends |
| Flow Angle | 90 degrees |
| Leg Length | 0.742 inches all ends and 0.758 inches all ends |
| Material | Aluminum |
| NIIN | 00-278-3682 |
| NSN | 4730-00-278-3682 |
| Surface Treatment | Anodize |
| Surface Treatment Specification | Mil-a-8625 military specification single treatment response inside, Mil-a-8625 military specification single treatment response outside |
| Thread Class | 3b all ends |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 all ends |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) all ends |
| Thread Size | 0.438 inches all ends |
| Weight | 0.04 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- AN939D4
- AN939D8
Cross-reference
No interchangeable or dimensionally similar parts are on record for AN939D4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error