fittings › boss nipples
MS21900W4
Adapter
Description
Adapter
Specifications
| Alternate Part Number | MS21900D4 |
|---|---|
| Connection Style | External seat for gasket seal (boss) 2nd end, Flared w/ gasket seal (boss) 1st end |
| Connection Type | Threaded external boss all ends |
| Material | Aluminum |
| Material Specification | T73 federal specification single material response qq-a-225/9 |
| Maximum Operating Pressure | 3000.0 pounds per square inch single response |
| Maximum Operating Temp | 135.0 degrees celsius single response |
| Media For Which Designed | Fluid single response |
| Nominallength | 1.188 |
| Special Features | Grumman a10 aircraft |
| Specification Data | 96906-ms21900 government standard |
| Style Designator | Flared and flareless w/ center wrenching facility |
| Surface Treatment | Anodize |
| Surface Treatment Specification | Cl 2 military specification single treatment response inside ty2 mil-a-8625, Cl 2 military specification single treatment response outside ty2 mil-a-8625 |
| 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 |
| Weight | 0.018 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- MS21900W4
- MS21900W5
- MS21900W8
- MS21900W10
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS21900W4 — functionally equivalent.
- MS21900D4 Listed alternate 7/16 in · Aluminum
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error