fittings › boss nipples
MS21900-4
Adapter
Description
Adapter
Specifications
| Connection Style | External seat for gasket seal (boss) 2nd end, Flared w/ gasket seal (boss) 1st end |
|---|---|
| Connection Type | Threaded external boss all ends |
| Dimension E | 0.688 in |
| Dimension N | 1.188 in |
| Dimension S | 0.563 in |
| Industry Standards/Certification | MS21900 |
| Material | Steel |
| Material Specification | Qq-s-637 federal specification single material response |
| Maximum Operating Pressure | 3000 pounds per square inch single response |
| Maximum Operating Temp | -65.0 degrees fahrenheit 2nd response, 275 degrees fahrenheit 1st response |
| Media For Which Designed | Hydraulic fluid single response |
| NIIN | 00-541-1579 |
| NSN | 4730-00-541-1579 |
| Nominallength | 1.188 |
| Specification Data | 96906-ms21900 government standard |
| Style Designator | Flared and flareless with center wrenching facility |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Class 2 military specification single treatment response type 2 qq-p-416 |
| 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 all ends |
| Thread T | 0.4375-20 |
| Tube Outside Diameter | 1/4 in |
| Weight | 0.0043 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- MS21900-4
- MS21900-5
- MS21900-5D
- MS21900-6
- MS21900-8
- MS21900-10
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS21900-4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error