fittings › boss reducers
MS21916W6-4
Military Standard Boss Reducer
Description
3/8" to 1/4", aluminum alloy, reducer, external thread, flareless tube
Specifications
| Connection Style | External seat for gasket seal (boss) all ends |
|---|---|
| Connection Type | Threaded external boss all ends |
| Material | Aluminum |
| Material Specification | Alloy 7075 federal specification single material response qq-a-250/12 |
| Maximum Operating Pressure | 3000.0 pounds per square inch single response |
| Media For Which Designed | Aeronautical fluid single response |
| Nominallength | 1.219 |
| Surface Treatment | Anodize |
| Surface Treatment Specification | Mil-a-8625 military specification single treatment response outside |
| Thread Class | 3a all ends |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) all ends |
| Thread Size | 0.438 inches 2nd end, 0.562 inches 1st end |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error